embulk storages pre-installed to fix filename issue

ebulk-data/embulk-wendelin-dataset-tool/build/tmp/jar/MANIFEST.MF

+Manifest-Version: 1.0
+

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/input/ftp.rb

+Embulk::JavaPlugin.register_input(
+  "ftp", "org.embulk.input.FtpFileInputPlugin",
+  File.expand_path('../../../../classpath', __FILE__))

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/input/http.rb

+Embulk::JavaPlugin.register_input(
+  "http", "org.embulk.input.http.HttpFileInputPlugin",
+  File.expand_path('../../../../classpath', __FILE__))

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/input/s3.rb

+Embulk::JavaPlugin.register_input(
+  :s3, "org.embulk.input.s3.S3FileInputPlugin",
+  File.expand_path('../../../../classpath', __FILE__))

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/output/wendelin.rb

@@ -18,7 +18,11 @@ module Embulk
 	task_reports = yield(task)
 	next_config_diff = {}
 	@logger = LogManager.instance()
-	@logger.info("Your ingested files will be available in the site in a few minutes. Thank for your patience.", print=TRUE)
+	if task_reports.length > 0
+	  @logger.info("Your ingested files will be available in the site in a few minutes. Thank for your patience.", print=TRUE)
+	else
+	  @logger.info("No new files where processed for ingestion.", print=TRUE)
+	end
 	return next_config_diff
       end
 

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/parser/binary.rb

@@ -20,10 +20,12 @@ module Embulk
     class BinaryParserPlugin < ParserPlugin
       Plugin.register_parser("binary", self)
 
+      METADATA_FILE_NAME = "/.metadata_file"
+
       def self.transaction(config, &control)
 	tool_dir = config.param('tool_dir', :string, default: ".")
 	@logger = LogManager.instance()
-	@logger.setFilename(tool_dir, "parser")
+	@logger.setFilename(tool_dir, "ingestion")
 	task = {
 	  chunk_size: config.param('chunk_size', :float, default: 0) * DatasetUtils::MEGA,
 	  supplier: config.param("supplier", :string, default: "parser"),
@@ -53,15 +55,31 @@ module Embulk
 	@logger = LogManager.instance()
 	while file = file_input.next_file
 	  begin
-	    filename = "file_from_#{task['input_plugin']}_#{task['date']}"
-	    each_chunk(file, filename, task['chunk_size']) do |record|
+	    metadata_file = Dir.pwd + METADATA_FILE_NAME
+	    metadata = File.open(metadata_file) {|f| f.readline} if File.exist?(metadata_file)
+	    File.delete(metadata_file) if File.exist?(metadata_file)
+	  rescue Exception => e
+	    @logger.error("An error occurred while getting file metadata: " + e.to_s)
+	    @logger.error(e.backtrace)
+	  end
+	  begin
+	    if metadata
+	      extension = File.extname metadata
+	      filename = metadata.reverse.sub(extension.reverse, "").reverse
+	      extension.gsub! '.', ''
+	      extension = extension == "" ? DatasetUtils::NONE_EXT : extension
+	    else
+	      filename = "file_from_#{task['input_plugin']}_#{task['date']}"
+	      extension = @index.to_s.rjust(3, "0")
+	    end
+	    each_chunk(file, filename.chomp, extension.chomp, task['chunk_size']) do |record|
 	      @page_builder.add(record)
 	    end
 	    @page_builder.finish
 	    Index.instance().increase()
 	  rescue java.lang.OutOfMemoryError
 	    @logger.logOutOfMemoryError(path)
-	    return
+	    @logger.abortExecution()
 	  rescue Exception => e
 	    @logger.error("An error occurred during file ingestion: " + e.to_s, print=TRUE)
 	    @logger.error(e.backtrace)
@@ -71,8 +89,7 @@ module Embulk
       end
 
       private
-      def each_chunk(file, filename, chunk_size=DatasetUtils::CHUNK_SIZE)
-	extension = @index.to_s.rjust(3, "0")
+      def each_chunk(file, filename, extension, chunk_size=DatasetUtils::CHUNK_SIZE)
 	npart = 0
 	next_byte = file.read(1)
 	first = TRUE

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/MetadataUtils.java

+package org.embulk.input;
+
+import java.io.PrintWriter;
+
+public class MetadataUtils
+{
+    public static final String METADATA_FILE_NAME = "/.metadata_file";
+
+    public void saveMetadata(String metadata)
+    {
+	try
+        {
+	    String directory = System.getProperty("user.dir");
+	    String metadata_file = directory.concat(METADATA_FILE_NAME);
+	    PrintWriter writer = new PrintWriter(metadata_file, "UTF-8");
+	    writer.println(metadata);
+	    writer.close();
+        }
+        catch (Exception e)
+        {
+            System.out.println("[ERROR] Could not store metadata: " + metadata);
+        }
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/http/BasicAuthOption.java

+package org.embulk.input.http;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.base.Objects;
+
+public class BasicAuthOption
+{
+    private final String user;
+    private final String password;
+
+    @JsonCreator
+    public BasicAuthOption(@JsonProperty("user") String user,
+            @JsonProperty("password") String password)
+    {
+        this.user = user;
+        this.password = password;
+    }
+
+    @JsonProperty("user")
+    public String getUser()
+    {
+        return user;
+    }
+
+    @JsonProperty("password")
+    public String getPassword()
+    {
+        return password;
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return Objects.hashCode(user, password);
+    }
+
+    @Override
+    public String toString()
+    {
+        return String.format("BasicAuthOption[%s, %s]", getUser(), getPassword());
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/http/PagerOption.java

+package org.embulk.input.http;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.base.Optional;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PagerOption
+{
+    private final String fromParam;
+    private final Optional<String> toParam;
+    private final int start;
+    private final int pages;
+    private final int step;
+
+    @JsonCreator
+    public PagerOption(@JsonProperty("from_param") String fromParam,
+            @JsonProperty("to_param") Optional<String> toParam,
+            @JsonProperty("start") Optional<Integer> start,
+            @JsonProperty("pages") int pages,
+            @JsonProperty("step") Optional<Integer> step)
+    {
+        this.fromParam = fromParam;
+        this.toParam = toParam;
+        this.start = start.or(0);
+        this.pages = pages;
+        this.step = step.or(1);
+    }
+
+    public List<List<QueryOption.Query>> expand()
+    {
+        List<List<QueryOption.Query>> queries = new ArrayList<>();
+        int p = 1;
+        int index = start;
+        while (p <= pages) {
+            List<QueryOption.Query> one = new ArrayList<>();
+            one.add(new QueryOption.Query(fromParam, Integer.toString(index)));
+            if (toParam.isPresent()) {
+                int t = index + step - 1;
+                one.add(new QueryOption.Query(toParam.get(), Integer.toString(t)));
+                index = t + 1;
+            }
+            else {
+                index += step;
+            }
+            queries.add(one);
+            p++;
+        }
+        return queries;
+    }
+
+    @JsonProperty("from_param")
+    public String getFromParam()
+    {
+        return fromParam;
+    }
+
+    @JsonProperty("to_param")
+    public Optional<String> getToParam()
+    {
+        return toParam;
+    }
+
+    @JsonProperty("start")
+    public int getStart()
+    {
+        return start;
+    }
+
+    @JsonProperty("pages")
+    public int getPages()
+    {
+        return pages;
+    }
+
+    @JsonProperty("step")
+    public int getStep()
+    {
+        return step;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "PagerOption{" +
+                "fromParam='" + fromParam + '\'' +
+                ", toParam=" + toParam +
+                ", start=" + start +
+                ", pages=" + pages +
+                ", step=" + step +
+                '}';
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/http/ParamsOption.java

+package org.embulk.input.http;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
+import com.google.common.base.Objects;
+import com.google.common.base.Optional;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ParamsOption
+{
+    private final List<QueryOption> queries;
+
+    @JsonCreator
+    public ParamsOption(List<QueryOption> queries)
+    {
+        this.queries = queries;
+    }
+
+    @JsonValue
+    public List<QueryOption> getQueries()
+    {
+        return queries;
+    }
+
+    public List<List<QueryOption.Query>> generateQueries(Optional<PagerOption> pagerOption)
+    {
+        List<List<QueryOption.Query>> base = new ArrayList<>(queries.size());
+        for (QueryOption p : queries) {
+            base.add(p.expand());
+        }
+
+        int productSize = 1;
+        int baseSize = base.size();
+        for (int i = 0; i < baseSize; productSize *= base.get(i).size(), i++) {
+        }
+
+        List<List<QueryOption.Query>> expands = new ArrayList<>(productSize);
+        for (int i = 0; i < productSize; i++) {
+            int j = 1;
+            List<QueryOption.Query> one = new ArrayList<>();
+            for (List<QueryOption.Query> list : base) {
+                QueryOption.Query pc = list.get((i / j) % list.size());
+                one.add(pc);
+                j *= list.size();
+            }
+            if (pagerOption.isPresent()) {
+                for (List<QueryOption.Query> q : pagerOption.get().expand()) {
+                    expands.add(copyAndConcat(one, q));
+                }
+            }
+            else {
+                expands.add(one);
+            }
+        }
+
+        return expands;
+    }
+
+    @Override
+    public boolean equals(Object obj)
+    {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof ParamsOption)) {
+            return false;
+        }
+        ParamsOption other = (ParamsOption) obj;
+        return Objects.equal(queries, other.queries);
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return Objects.hashCode(queries);
+    }
+
+    private List<QueryOption.Query> copyAndConcat(List<QueryOption.Query>... srcs)
+    {
+        List<QueryOption.Query> dest = new ArrayList<>();
+        for (List<QueryOption.Query> src : srcs) {
+            for (QueryOption.Query q : src) {
+                dest.add(q.copy());
+            }
+        }
+        return dest;
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/http/QueryOption.java

+package org.embulk.input.http;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.base.Objects;
+import com.google.common.base.Optional;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class QueryOption
+{
+    private final String name;
+    private final Optional<String> value;
+    private final Optional<List<String>> values;
+    private final boolean expand;
+
+    @JsonCreator
+    public QueryOption(@JsonProperty("name") String name,
+            @JsonProperty("value") Optional<String> value,
+            @JsonProperty("values") Optional<List<String>> values,
+            @JsonProperty("expand") boolean expand)
+    {
+        this.name = name;
+        this.value = value;
+        this.values = values;
+        this.expand = expand;
+    }
+
+    public List<Query> expand()
+    {
+        List<Query> dest;
+        if (value.isPresent()) {
+            if (expand) {
+                List<String> expanded = BraceExpansion.expand(value.get());
+                dest = new ArrayList<>(expanded.size());
+                for (String s : expanded) {
+                    dest.add(new Query(name, s));
+                }
+            }
+            else {
+                dest = new ArrayList<>(1);
+                dest.add(new Query(name, value.get()));
+            }
+        }
+        else if (values.isPresent()) {
+            if (expand) {
+                dest = new ArrayList<>(values.get().size());
+                for (String s : values.get()) {
+                    dest.add(new Query(name, s));
+                }
+            }
+            else {
+                dest = new ArrayList<>(1);
+                final String[] valueArr = values.get().toArray(new String[values.get().size()]);
+                dest.add(new Query(name, valueArr));
+            }
+        }
+        else {
+            throw new IllegalArgumentException("value or values must be specified to 'params'");
+        }
+        return dest;
+    }
+
+    @JsonProperty("name")
+    public String getName()
+    {
+        return name;
+    }
+
+    @JsonProperty("value")
+    public Optional<String> getValue()
+    {
+        return value;
+    }
+
+    @JsonProperty("expand")
+    public boolean isExpand()
+    {
+        return expand;
+    }
+
+    @Override
+    public boolean equals(Object obj)
+    {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof QueryOption)) {
+            return false;
+        }
+        QueryOption other = (QueryOption) obj;
+        return Objects.equal(this.name, other.name) &&
+                Objects.equal(value, other.value) &&
+                Objects.equal(expand, other.expand);
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return Objects.hashCode(name, value, expand);
+    }
+
+    @Override
+    public String toString()
+    {
+        return String.format("ParameterConfig[%s, %s, %s]",
+                getName(), getValue(), isExpand());
+    }
+
+    public static class Query
+    {
+        private final String name;
+        private final String[] values;
+
+        public Query(@JsonProperty("name") String name,
+                @JsonProperty("values") String... values)
+        {
+            this.name = name;
+            this.values = values;
+        }
+
+        public String getName()
+        {
+            return name;
+        }
+
+        public String[] getValues()
+        {
+            return values;
+        }
+
+        public Query copy()
+        {
+            return new Query(this.name, Arrays.copyOf(this.values, this.values.length));
+        }
+    }
+
+    private static class BraceExpansion
+    {
+        public static List<String> expand(String s)
+        {
+            return expandRecursive("", s, "", new ArrayList<String>());
+        }
+
+        private static List<String> expandRecursive(String prefix, String s,
+                                                    String suffix, List<String> dest)
+        {
+            // used the code below as reference.
+            //  http://rosettacode.org/wiki/Brace_expansion#Java
+            int i1 = -1;
+            int i2 = 0;
+            String noEscape = s.replaceAll("([\\\\]{2}|[\\\\][,}{])", "  ");
+            StringBuilder sb = null;
+
+            outer:
+            while ((i1 = noEscape.indexOf('{', i1 + 1)) != -1) {
+                i2 = i1 + 1;
+                sb = new StringBuilder(s);
+                for (int depth = 1; i2 < s.length() && depth > 0; i2++) {
+                    char c = noEscape.charAt(i2);
+                    depth = (c == '{') ? ++depth : depth;
+                    depth = (c == '}') ? --depth : depth;
+                    if (c == ',' && depth == 1) {
+                        sb.setCharAt(i2, '\u0000');
+                    }
+                    else if (c == '}' && depth == 0 && sb.indexOf("\u0000") != -1) {
+                        break outer;
+                    }
+                }
+            }
+
+            if (i1 == -1) {
+                if (suffix.length() > 0) {
+                    expandRecursive(prefix + s, suffix, "", dest);
+                }
+                else {
+                    final String out = String.format("%s%s%s", prefix, s, suffix).
+                            replaceAll("[\\\\]{2}", "\\").replaceAll("[\\\\]([,}{])", "$1");
+                    dest.add(out);
+                }
+            }
+            else {
+                for (String m : sb.substring(i1 + 1, i2).split("\u0000", -1)) {
+                    expandRecursive(prefix + s.substring(0, i1), m, s.substring(i2 + 1) + suffix, dest);
+                }
+            }
+            return dest;
+        }
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/http/RetryableHandler.java

+package org.embulk.input.http;
+
+import com.google.common.collect.ImmutableList;
+import org.apache.http.HttpException;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpRequestBase;
+import org.apache.http.util.EntityUtils;
+import org.embulk.spi.Exec;
+import org.embulk.spi.util.RetryExecutor;
+import org.slf4j.Logger;
+
+import javax.net.ssl.SSLException;
+
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.net.UnknownHostException;
+import java.util.List;
+
+public class RetryableHandler implements RetryExecutor.Retryable
+{
+    protected final Logger logger = Exec.getLogger(getClass());
+
+    private static final List<Class<? extends IOException>> NOT_RETRIABLE_CLASSES = ImmutableList.of(UnknownHostException.class,
+            InterruptedIOException.class, SSLException.class);
+
+    private final HttpClient client;
+    private final HttpRequestBase request;
+    private HttpResponse response;
+
+    public RetryableHandler(HttpClient client, HttpRequestBase request)
+    {
+        this.client = client;
+        this.request = request;
+    }
+
+    public HttpResponse getResponse()
+    {
+        return response;
+    }
+
+    @Override
+    public Object call() throws Exception
+    {
+        if (response != null) {
+            throw new IllegalStateException("response is already set");
+        }
+        HttpResponse response = client.execute(request);
+        statusIsOkOrThrow(response);
+        this.response = response;
+        return null;
+    }
+
+    @Override
+    public boolean isRetryableException(Exception exception)
+    {
+        if (NOT_RETRIABLE_CLASSES.contains(exception.getClass())) {
+            logger.error(String.format("'%s' is not retriable", exception.getClass()));
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public void onRetry(Exception exception, int retryCount, int retryLimit, int retryWait)
+            throws RetryExecutor.RetryGiveupException
+    {
+        logger.warn("retrying {}/{} after {} seconds. Message: {}",
+                retryCount, retryLimit, retryWait / 1000,
+                exception.getMessage());
+    }
+
+    @Override
+    public void onGiveup(Exception firstException, Exception lastException)
+            throws RetryExecutor.RetryGiveupException
+    {
+        logger.error("giveup {}", lastException.getMessage());
+    }
+
+    protected void statusIsOkOrThrow(HttpResponse response)
+            throws HttpException, IOException
+    {
+        int code = response.getStatusLine().getStatusCode();
+        switch (response.getStatusLine().getStatusCode()) {
+            case 200:
+                return;
+            default:
+                throw new HttpException(String.format("Request is not successful, code=%d, body=%s",
+                        code, EntityUtils.toString(response.getEntity())));
+        }
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/s3/DefaultRetryable.java

+package org.embulk.input.s3;
+
+import com.amazonaws.AmazonServiceException;
+import com.google.common.base.Throwables;
+import org.apache.http.HttpStatus;
+import org.embulk.spi.Exec;
+import org.embulk.spi.util.RetryExecutor;
+import org.slf4j.Logger;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.Callable;
+
+import static java.lang.String.format;
+import static org.embulk.spi.util.RetryExecutor.RetryGiveupException;
+import static org.embulk.spi.util.RetryExecutor.Retryable;
+
+/**
+ * Retryable utility, regardless the occurred exceptions,
+ * Also provide a default approach for exception propagation.
+ */
+class DefaultRetryable<T> implements Retryable<T>
+{
+    private static final Logger log = Exec.getLogger(DefaultRetryable.class);
+    private static final Set<Integer> NONRETRYABLE_STATUS_CODES = new HashSet<Integer>(2);
+    private static final Set<String> NONRETRYABLE_ERROR_CODES = new HashSet<String>(1);
+    private String operationName;
+    private Callable<T> callable;
+
+    static {
+        NONRETRYABLE_STATUS_CODES.add(HttpStatus.SC_FORBIDDEN);
+        NONRETRYABLE_STATUS_CODES.add(HttpStatus.SC_METHOD_NOT_ALLOWED);
+        NONRETRYABLE_ERROR_CODES.add("ExpiredToken");
+    }
+
+    /**
+     * @param operationName the name that will be referred on logging
+     */
+    public DefaultRetryable(String operationName)
+    {
+        this.operationName = operationName;
+    }
+
+    /**
+     * @param operationName the name that will be referred on logging
+     * @param callable the operation, either define this at construction time or override the call() method
+     */
+    public DefaultRetryable(String operationName, Callable<T> callable)
+    {
+        this.operationName = operationName;
+        this.callable = callable;
+    }
+
+    public DefaultRetryable()
+    {
+        this("Anonymous operation");
+    }
+
+    public DefaultRetryable(Callable<T> callable)
+    {
+        this("Anonymous operation", callable);
+    }
+
+    @Override
+    public T call() throws Exception
+    {
+        if (callable != null) {
+            return callable.call();
+        }
+        else {
+            throw new IllegalStateException("Either override call() or construct with a Runnable");
+        }
+    }
+
+    @Override
+    public boolean isRetryableException(Exception exception)
+    {
+        // No retry on a subset of service exceptions
+        if (exception instanceof AmazonServiceException) {
+            AmazonServiceException ase = (AmazonServiceException) exception;
+            return !NONRETRYABLE_STATUS_CODES.contains(ase.getStatusCode()) && !NONRETRYABLE_ERROR_CODES.contains(ase.getErrorCode());
+        }
+        return true;
+    }
+
+    @Override
+    public void onRetry(Exception exception, int retryCount, int retryLimit, int retryWait)
+    {
+        String message = format("%s failed. Retrying %d/%d after %d seconds. Message: %s",
+                operationName, retryCount, retryLimit, retryWait / 1000, exception.getMessage());
+        if (retryCount % retryLimit == 0) {
+            log.warn(message, exception);
+        }
+        else {
+            log.warn(message);
+        }
+    }
+
+    @Override
+    public void onGiveup(Exception firstException, Exception lastException)
+    {
+        // Exceptions would be propagated, so it's up to the caller to handle, this is just warning
+        log.warn("Giving up on retrying for {}, first exception is [{}], last exception is [{}]",
+                operationName, firstException.getMessage(), lastException.getMessage());
+    }
+
+    /**
+     * Run itself by the supplied executor,
+     *
+     * This propagates all exceptions (as unchecked) and unwrap RetryGiveupException for the original cause.
+     * If the original exception already is a RuntimeException, it will be propagated as is. If not, it will
+     * be wrapped around with a RuntimeException.
+     *
+     * For convenient, it execute normally without retrying when executor is null.
+     *
+     * @throws RuntimeException the original cause
+     */
+    public T executeWith(RetryExecutor executor)
+    {
+        if (executor == null) {
+            try {
+                return this.call();
+            }
+            catch (Exception e) {
+                Throwables.propagate(e);
+            }
+        }
+
+        try {
+            return executor.runInterruptible(this);
+        }
+        catch (RetryGiveupException e) {
+            throw Throwables.propagate(e.getCause());
+        }
+        catch (InterruptedException e) {
+            throw Throwables.propagate(e);
+        }
+    }
+
+    /**
+     * Run itself by the supplied executor,
+     *
+     * Same as `executeWith`, this propagates all original exceptions. But `propagateAsIsException` will
+     * be re-throw without being wrapped on a RuntimeException, whether it is a checked or unchecked exception.
+     *
+     * For convenient, it execute normally without retrying when executor is null.
+     *
+     * @throws X whatever checked exception that you decided to propagate directly
+     * @throws RuntimeException wrap around whatever the original cause of failure (potentially thread interruption)
+     */
+    public <X extends Throwable> T executeWithCheckedException(RetryExecutor executor,
+                                                               Class<X> propagateAsIsException) throws X
+    {
+        if (executor == null) {
+            try {
+                return this.call();
+            }
+            catch (Exception e) {
+                Throwables.propagate(e);
+            }
+        }
+
+        try {
+            return executor.runInterruptible(this);
+        }
+        catch (RetryGiveupException e) {
+            Throwables.propagateIfInstanceOf(e.getCause(), propagateAsIsException);
+            throw Throwables.propagate(e.getCause());
+        }
+        catch (InterruptedException e) {
+            throw Throwables.propagate(e);
+        }
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/s3/FileList.java

+package org.embulk.input.s3;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.base.Optional;
+import com.google.common.base.Throwables;
+
+import org.embulk.config.Config;
+import org.embulk.config.ConfigDefault;
+import org.embulk.config.ConfigSource;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.AbstractList;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+// this class should be moved to embulk-core
+public class FileList
+{
+    public interface Task
+    {
+        @Config("path_match_pattern")
+        @ConfigDefault("\".*\"")
+        String getPathMatchPattern();
+
+        @Config("total_file_count_limit")
+        @ConfigDefault("2147483647")
+        int getTotalFileCountLimit();
+
+        // TODO support more algorithms to combine tasks
+        @Config("min_task_size")
+        @ConfigDefault("0")
+        long getMinTaskSize();
+    }
+
+    public static class Entry
+    {
+        private int index;
+        private long size;
+
+        @JsonCreator
+        public Entry(
+                @JsonProperty("index") int index,
+                @JsonProperty("size") long size)
+        {
+            this.index = index;
+            this.size = size;
+        }
+
+        @JsonProperty("index")
+        public int getIndex()
+        {
+            return index;
+        }
+
+        @JsonProperty("size")
+        public long getSize()
+        {
+            return size;
+        }
+    }
+
+    public static class Builder
+    {
+        private final ByteArrayOutputStream binary;
+        private final OutputStream stream;
+        private final List<Entry> entries = new ArrayList<>();
+        private String last = null;
+
+        private int limitCount = Integer.MAX_VALUE;
+        private long minTaskSize = 1;
+        private Pattern pathMatchPattern;
+
+        private final ByteBuffer castBuffer = ByteBuffer.allocate(4);
+
+        public Builder(Task task)
+        {
+            this();
+            this.pathMatchPattern = Pattern.compile(task.getPathMatchPattern());
+            this.limitCount = task.getTotalFileCountLimit();
+            this.minTaskSize = task.getMinTaskSize();
+        }
+
+        public Builder(ConfigSource config)
+        {
+            this();
+            this.pathMatchPattern = Pattern.compile(config.get(String.class, "path_match_pattern", ".*"));
+            this.limitCount = config.get(int.class, "total_file_count_limit", Integer.MAX_VALUE);
+            this.minTaskSize = config.get(long.class, "min_task_size", 0L);
+        }
+
+        public Builder()
+        {
+            binary = new ByteArrayOutputStream();
+            try {
+                stream = new BufferedOutputStream(new GZIPOutputStream(binary));
+            }
+            catch (IOException ex) {
+                throw Throwables.propagate(ex);
+            }
+        }
+
+        public Builder limitTotalFileCount(int limitCount)
+        {
+            this.limitCount = limitCount;
+            return this;
+        }
+
+        public Builder minTaskSize(long bytes)
+        {
+            this.minTaskSize = bytes;
+            return this;
+        }
+
+        public Builder pathMatchPattern(String pattern)
+        {
+            this.pathMatchPattern = Pattern.compile(pattern);
+            return this;
+        }
+
+        public int size()
+        {
+            return entries.size();
+        }
+
+        public boolean needsMore()
+        {
+            return size() < limitCount;
+        }
+
+        // returns true if this file is used
+        public synchronized boolean add(String path, long size)
+        {
+            // TODO throw IllegalStateException if stream is already closed
+
+            if (!needsMore()) {
+                return false;
+            }
+
+            if (!pathMatchPattern.matcher(path).find()) {
+                return false;
+            }
+
+            int index = entries.size();
+            entries.add(new Entry(index, size));
+
+            byte[] data = path.getBytes(StandardCharsets.UTF_8);
+            castBuffer.putInt(0, data.length);
+            try {
+                stream.write(castBuffer.array());
+                stream.write(data);
+            }
+            catch (IOException ex) {
+                throw Throwables.propagate(ex);
+            }
+
+            last = path;
+            return true;
+        }
+
+        public FileList build()
+        {
+            try {
+                stream.close();
+            }
+            catch (IOException ex) {
+                throw Throwables.propagate(ex);
+            }
+            return new FileList(binary.toByteArray(), getSplits(entries), Optional.fromNullable(last));
+        }
+
+        private List<List<Entry>> getSplits(List<Entry> all)
+        {
+            List<List<Entry>> tasks = new ArrayList<>();
+            long currentTaskSize = 0;
+            List<Entry> currentTask = new ArrayList<>();
+            for (Entry entry : all) {
+                currentTask.add(entry);
+                currentTaskSize += entry.getSize();  // TODO consider to multiply the size by cost_per_byte, and add cost_per_file
+                if (currentTaskSize >= minTaskSize) {
+                    tasks.add(currentTask);
+                    currentTask = new ArrayList<>();
+                    currentTaskSize = 0;
+                }
+            }
+            if (!currentTask.isEmpty()) {
+                tasks.add(currentTask);
+            }
+            return tasks;
+        }
+    }
+
+    private final byte[] data;
+    private final List<List<Entry>> tasks;
+    private final Optional<String> last;
+
+    @JsonCreator
+    @Deprecated
+    public FileList(
+            @JsonProperty("data") byte[] data,
+            @JsonProperty("tasks") List<List<Entry>> tasks,
+            @JsonProperty("last") Optional<String> last)
+    {
+        this.data = data;
+        this.tasks = tasks;
+        this.last = last;
+    }
+
+    @JsonIgnore
+    public Optional<String> getLastPath(Optional<String> lastLastPath)
+    {
+        if (last.isPresent()) {
+            return last;
+        }
+        return lastLastPath;
+    }
+
+    @JsonIgnore
+    public int getTaskCount()
+    {
+        return tasks.size();
+    }
+
+    @JsonIgnore
+    public List<String> get(int i)
+    {
+        return new EntryList(data, tasks.get(i));
+    }
+
+    @JsonProperty("data")
+    @Deprecated
+    public byte[] getData()
+    {
+        return data;
+    }
+
+    @JsonProperty("tasks")
+    @Deprecated
+    public List<List<Entry>> getTasks()
+    {
+        return tasks;
+    }
+
+    @JsonProperty("last")
+    @Deprecated
+    public Optional<String> getLast()
+    {
+        return last;
+    }
+
+    private class EntryList
+            extends AbstractList<String>
+    {
+        private final byte[] data;
+        private final List<Entry> entries;
+        private InputStream stream;
+        private int current;
+
+        private final ByteBuffer castBuffer = ByteBuffer.allocate(4);
+
+        public EntryList(byte[] data, List<Entry> entries)
+        {
+            this.data = data;
+            this.entries = entries;
+            try {
+                this.stream = new BufferedInputStream(new GZIPInputStream(new ByteArrayInputStream(data)));
+            }
+            catch (IOException ex) {
+                throw Throwables.propagate(ex);
+            }
+            this.current = 0;
+        }
+
+        @Override
+        public synchronized String get(int i)
+        {
+            Entry e = entries.get(i);
+            if (e.getIndex() < current) {
+                // rewind to the head
+                try {
+                    stream.close();
+                    stream = new BufferedInputStream(new GZIPInputStream(new ByteArrayInputStream(data)));
+                }
+                catch (IOException ex) {
+                    throw Throwables.propagate(ex);
+                }
+                current = 0;
+            }
+
+            while (current < e.getIndex()) {
+                readNext();
+            }
+            // now current == e.getIndex()
+            return readNextString();
+        }
+
+        @Override
+        public int size()
+        {
+            return entries.size();
+        }
+
+        private byte[] readNext()
+        {
+            try {
+                stream.read(castBuffer.array());
+                int n = castBuffer.getInt(0);
+                byte[] b = new byte[n];  // here should be able to use a pooled buffer because read data is ignored if readNextString doesn't call this method
+                stream.read(b);
+
+                current++;
+
+                return b;
+            }
+            catch (IOException ex) {
+                throw Throwables.propagate(ex);
+            }
+        }
+
+        private String readNextString()
+        {
+            return new String(readNext(), StandardCharsets.UTF_8);
+        }
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/s3/HttpProxy.java

+package org.embulk.input.s3;
+
+import com.google.common.base.Optional;
+import org.embulk.config.Config;
+import org.embulk.config.ConfigDefault;
+import org.embulk.config.Task;
+
+/**
+ * HttpProxy is config unit for Input/Output plugins' configs.
+ *
+ * TODO: This unit will be moved to embulk/embulk-plugin-units.git.
+ * TODO: Consider using @JsonProperty(defaultValue=...) in Jackson 2.6+.
+ */
+public interface HttpProxy
+    extends Task
+{
+    @Config("host")
+    public String getHost();
+
+    @Config("port")
+    @ConfigDefault("null")
+    public Optional<Integer> getPort();
+
+    @Config("https")
+    @ConfigDefault("true")
+    public boolean getHttps();
+
+    @Config("user")
+    @ConfigDefault("null")
+    public Optional<String> getUser();
+
+    @Config("password")
+    @ConfigDefault("null")
+    public Optional<String> getPassword();
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/s3/RetrySupportPluginTask.java

+package org.embulk.input.s3;
+
+import org.embulk.config.Config;
+import org.embulk.config.ConfigDefault;
+import org.embulk.config.Task;
+
+public interface RetrySupportPluginTask extends Task
+{
+    @Config("maximum_retries")
+    @ConfigDefault("7")
+    int getMaximumRetries();
+
+    @Config("initial_retry_interval_millis")
+    @ConfigDefault("30000")
+    int getInitialRetryIntervalMillis();
+
+    @Config("maximum_retry_interval_millis")
+    @ConfigDefault("480000")
+    int getMaximumRetryIntervalMillis();
+}

ebulk-data/embulk-wendelin-dataset-tool/src/main/java/org/embulk/input/s3/S3FileInputPlugin.java

+package org.embulk.input.s3;
+
+import com.amazonaws.client.builder.AwsClientBuilder.EndpointConfiguration;
+import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.AmazonS3ClientBuilder;
+import com.google.common.base.Optional;
+import org.embulk.config.Config;
+import org.embulk.config.ConfigDefault;
+import org.embulk.spi.Exec;
+import org.slf4j.Logger;
+
+public class S3FileInputPlugin
+        extends AbstractS3FileInputPlugin
+{
+    public interface S3PluginTask
+            extends PluginTask
+    {
+        @Config("endpoint")
+        @ConfigDefault("null")
+        public Optional<String> getEndpoint();
+
+        @Config("region")
+        @ConfigDefault("null")
+        public Optional<String> getRegion();
+    }
+
+    private static final Logger log = Exec.getLogger(S3FileInputPlugin.class);
+
+    @Override
+    protected Class<? extends PluginTask> getTaskClass()
+    {
+        return S3PluginTask.class;
+    }
+
+    @Override
+    protected AmazonS3 newS3Client(PluginTask task)
+    {
+        S3PluginTask t = (S3PluginTask) task;
+        Optional<String> endpoint = t.getEndpoint();
+        Optional<String> region = t.getRegion();
+
+        AmazonS3ClientBuilder builder = super.defaultS3ClientBuilder(t);
+
+        // Favor the `endpoint` configuration, then `region`, if both are absent then `s3.amazonaws.com` will be used.
+        if (endpoint.isPresent()) {
+            if (region.isPresent()) {
+                log.warn("Either configure endpoint or region, " +
+                        "if both is specified only the endpoint will be in effect.");
+            }
+            builder.setEndpointConfiguration(new EndpointConfiguration(endpoint.get(), null));
+        }
+        else if (region.isPresent()) {
+            builder.setRegion(region.get());
+        }
+        else {
+            // This is to keep the AWS SDK upgrading to 1.11.x to be backward compatible with old configuration.
+            //
+            // On SDK 1.10.x, when neither endpoint nor region is set explicitly, the client's endpoint will be by
+            // default `s3.amazonaws.com`. And for pre-Signature-V4, this will work fine as the bucket's region
+            // will be resolved to the appropriate region on server (AWS) side.
+            //
+            // On SDK 1.11.x, a region will be computed on client side by AwsRegionProvider and the endpoint now will
+            // be region-specific `<region>.s3.amazonaws.com` and might be the wrong one.
+            //
+            // So a default endpoint of `s3.amazonaws.com` when both endpoint and region configs are absent are
+            // necessary to make old configurations won't suddenly break. The side effect is that this will render
+            // AwsRegionProvider useless. And it's worth to note that Signature-V4 won't work with either versions with
+            // no explicit region or endpoint as the region (inferrable from endpoint) are necessary for signing.
+            builder.setEndpointConfiguration(new EndpointConfiguration("s3.amazonaws.com", null));
+        }
+
+        return builder.build();
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/test/java/org/embulk/input/http/TestHttpInputPlugin.java

+package org.embulk.input.http;
+
+public class TestHttpInputPlugin
+{
+}

ebulk-data/embulk-wendelin-dataset-tool/src/test/java/org/embulk/input/http/TestPagerOption.java

+package org.embulk.input.http;
+
+import com.google.common.base.Optional;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestPagerOption
+{
+    @Test
+    public void testExpandFromTo() throws Exception
+    {
+        List<List<QueryOption.Query>> dest = new PagerOption("from", Optional.of("to"), Optional.of(1), 3,
+                Optional.of(2)).expand();
+        assertEquals(dest.size(), 3);
+
+        assertEquals(dest.get(0).size(), 2);
+        assertEquals(dest.get(0).get(0).getName(), "from");
+        assertEquals(dest.get(0).get(0).getValues()[0], "1");
+        assertEquals(dest.get(0).get(1).getName(), "to");
+        assertEquals(dest.get(0).get(1).getValues()[0], "2");
+
+        assertEquals(dest.get(1).size(), 2);
+        assertEquals(dest.get(1).get(0).getName(), "from");
+        assertEquals(dest.get(1).get(0).getValues()[0], "3");
+        assertEquals(dest.get(1).get(1).getName(), "to");
+        assertEquals(dest.get(1).get(1).getValues()[0], "4");
+
+        assertEquals(dest.get(2).size(), 2);
+        assertEquals(dest.get(2).get(0).getName(), "from");
+        assertEquals(dest.get(2).get(0).getValues()[0], "5");
+        assertEquals(dest.get(2).get(1).getName(), "to");
+        assertEquals(dest.get(2).get(1).getValues()[0], "6");
+    }
+
+    @Test
+    public void testExpandFromToWithDefault() throws Exception
+    {
+        Optional<Integer> nullValue = Optional.absent();
+
+        List<List<QueryOption.Query>> dest = new PagerOption("from", Optional.of("to"), nullValue, 2, nullValue)
+                .expand();
+        assertEquals(dest.size(), 2);
+
+        assertEquals(dest.get(0).size(), 2);
+        assertEquals(dest.get(0).get(0).getName(), "from");
+        assertEquals(dest.get(0).get(0).getValues()[0], "0");
+        assertEquals(dest.get(0).get(1).getName(), "to");
+        assertEquals(dest.get(0).get(1).getValues()[0], "0");
+
+        assertEquals(dest.get(1).size(), 2);
+        assertEquals(dest.get(1).get(0).getName(), "from");
+        assertEquals(dest.get(1).get(0).getValues()[0], "1");
+        assertEquals(dest.get(1).get(1).getName(), "to");
+        assertEquals(dest.get(1).get(1).getValues()[0], "1");
+    }
+
+    @Test
+    public void testExpandPagenate() throws Exception
+    {
+        Optional<String> nullValue = Optional.absent();
+        List<List<QueryOption.Query>> dest = new PagerOption("page", nullValue, Optional.of(1), 3,
+                Optional.of(1)).expand();
+        assertEquals(dest.size(), 3);
+
+        assertEquals(dest.get(0).size(), 1);
+        assertEquals(dest.get(0).get(0).getName(), "page");
+        assertEquals(dest.get(0).get(0).getValues()[0], "1");
+
+        assertEquals(dest.get(1).size(), 1);
+        assertEquals(dest.get(1).get(0).getName(), "page");
+        assertEquals(dest.get(1).get(0).getValues()[0], "2");
+
+        assertEquals(dest.get(2).size(), 1);
+        assertEquals(dest.get(2).get(0).getName(), "page");
+        assertEquals(dest.get(2).get(0).getValues()[0], "3");
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/test/java/org/embulk/input/http/TestParamsOption.java

+package org.embulk.input.http;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.Lists;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestParamsOption
+{
+    @Test
+    public void testUnexpandQueriesSinglePair() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        QueryOption q1 = new QueryOption("test1", Optional.of("awasome1"), nullValues, false);
+        QueryOption q2 = new QueryOption("test2", Optional.of("awasome2"), nullValues, false);
+        ParamsOption paramsOption = new ParamsOption(Lists.newArrayList(q1, q2));
+        Optional<PagerOption> pagerOption = Optional.absent();
+        List<List<QueryOption.Query>> dest = paramsOption.generateQueries(pagerOption);
+        assertEquals(dest.size(), 1);
+        assertEquals(dest.get(0).size(), 2);
+        assertEquals(dest.get(0).get(0).getName(), "test1");
+        assertEquals(dest.get(0).get(0).getValues()[0], "awasome1");
+        assertEquals(dest.get(0).get(1).getName(), "test2");
+        assertEquals(dest.get(0).get(1).getValues()[0], "awasome2");
+    }
+
+    @Test
+    public void testUnexpandQueriesExpandPair() throws Exception
+    {
+        Optional<String> nullValue = Optional.absent();
+        List<String> values1 = Lists.newArrayList("a", "b");
+        List<String> values2 = Lists.newArrayList("c", "d");
+
+        QueryOption q1 = new QueryOption("test1", nullValue, Optional.of(values1), false);
+        QueryOption q2 = new QueryOption("test2", nullValue, Optional.of(values2), false);
+
+        ParamsOption paramsOption = new ParamsOption(Lists.newArrayList(q1, q2));
+        Optional<PagerOption> pagerOption = Optional.absent();
+        List<List<QueryOption.Query>> dest = paramsOption.generateQueries(pagerOption);
+        assertEquals(dest.size(), 1);
+        assertEquals(dest.get(0).size(), 2);
+        assertEquals(dest.get(0).get(0).getName(), "test1");
+        assertEquals(dest.get(0).get(0).getValues()[0], "a");
+        assertEquals(dest.get(0).get(0).getValues()[1], "b");
+        assertEquals(dest.get(0).get(1).getName(), "test2");
+        assertEquals(dest.get(0).get(1).getValues()[0], "c");
+        assertEquals(dest.get(0).get(1).getValues()[1], "d");
+    }
+
+    @Test
+    public void testExpandQueriesSinglePair() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        QueryOption q1 = new QueryOption("test1", Optional.of("awasome1"), nullValues, true);
+        QueryOption q2 = new QueryOption("test2", Optional.of("awasome2"), nullValues, true);
+        ParamsOption paramsOption = new ParamsOption(Lists.newArrayList(q1, q2));
+        Optional<PagerOption> pagerOption = Optional.absent();
+        List<List<QueryOption.Query>> dest = paramsOption.generateQueries(pagerOption);
+        assertEquals(dest.size(), 1);
+        assertEquals(dest.get(0).size(), 2);
+        assertEquals(dest.get(0).get(0).getName(), "test1");
+        assertEquals(dest.get(0).get(0).getValues()[0], "awasome1");
+        assertEquals(dest.get(0).get(1).getName(), "test2");
+        assertEquals(dest.get(0).get(1).getValues()[0], "awasome2");
+    }
+
+    @Test
+    public void testExpandQueriesExpandPair() throws Exception
+    {
+        Optional<String> nullValue = Optional.absent();
+        List<String> values1 = Lists.newArrayList("a", "b");
+        List<String> values2 = Lists.newArrayList("c", "d");
+
+        QueryOption q1 = new QueryOption("test1", nullValue, Optional.of(values1), true);
+        QueryOption q2 = new QueryOption("test2", nullValue, Optional.of(values2), true);
+
+        ParamsOption paramsOption = new ParamsOption(Lists.newArrayList(q1, q2));
+        Optional<PagerOption> pagerOption = Optional.absent();
+        List<List<QueryOption.Query>> dest = paramsOption.generateQueries(pagerOption);
+        assertEquals(dest.size(), 4);
+
+        assertEquals(dest.get(0).size(), 2);
+        assertEquals(dest.get(0).get(0).getName(), "test1");
+        assertEquals(dest.get(0).get(0).getValues()[0], "a");
+        assertEquals(dest.get(0).get(1).getName(), "test2");
+        assertEquals(dest.get(0).get(1).getValues()[0], "c");
+
+        assertEquals(dest.get(1).size(), 2);
+        assertEquals(dest.get(1).get(0).getName(), "test1");
+        assertEquals(dest.get(1).get(0).getValues()[0], "b");
+        assertEquals(dest.get(1).get(1).getName(), "test2");
+        assertEquals(dest.get(1).get(1).getValues()[0], "c");
+
+        assertEquals(dest.get(2).size(), 2);
+        assertEquals(dest.get(2).get(0).getName(), "test1");
+        assertEquals(dest.get(2).get(0).getValues()[0], "a");
+        assertEquals(dest.get(2).get(1).getName(), "test2");
+        assertEquals(dest.get(2).get(1).getValues()[0], "d");
+
+        assertEquals(dest.get(3).size(), 2);
+        assertEquals(dest.get(3).get(0).getName(), "test1");
+        assertEquals(dest.get(3).get(0).getValues()[0], "b");
+        assertEquals(dest.get(3).get(1).getName(), "test2");
+        assertEquals(dest.get(3).get(1).getValues()[0], "d");
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/test/java/org/embulk/input/http/TestQueryOption.java

+package org.embulk.input.http;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.Lists;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestQueryOption
+{
+    @Test
+    public void testUnexpandSingleValue() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        QueryOption config = new QueryOption("test", Optional.of("awesome"), nullValues, false);
+        List<QueryOption.Query> dest = config.expand();
+        assertEquals(dest.size(), 1);
+        assertEquals(dest.get(0).getName(), "test");
+        assertEquals(dest.get(0).getValues().length, 1);
+        assertEquals(dest.get(0).getValues()[0], "awesome");
+    }
+
+    @Test
+    public void testUnexpandMultiValue() throws Exception
+    {
+        Optional<String> nullValue = Optional.absent();
+        List<String> values = Lists.newArrayList("a", "b", "c");
+        QueryOption config = new QueryOption("test", nullValue, Optional.of(values), false);
+        List<QueryOption.Query> dest = config.expand();
+        assertEquals(dest.size(), 1);
+        assertEquals(dest.get(0).getName(), "test");
+
+        assertEquals(dest.get(0).getValues().length, 3);
+        assertEquals(dest.get(0).getValues()[0], "a");
+        assertEquals(dest.get(0).getValues()[1], "b");
+        assertEquals(dest.get(0).getValues()[2], "c");
+    }
+
+    @Test
+    public void testExpandSingleValue() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        QueryOption config = new QueryOption("test", Optional.of("awesome"), nullValues, true);
+        List<QueryOption.Query> dest = config.expand();
+        assertEquals(dest.size(), 1);
+        assertEquals(dest.get(0).getName(), "test");
+        assertEquals(dest.get(0).getValues()[0], "awesome");
+    }
+
+    @Test
+    public void testExpandMultiValue() throws Exception
+    {
+        Optional<String> nullValue = Optional.absent();
+        List<String> values = Lists.newArrayList("a", "b", "c");
+        QueryOption config = new QueryOption("test", nullValue, Optional.of(values), true);
+        List<QueryOption.Query> dest = config.expand();
+        assertEquals(dest.size(), 3);
+        assertEquals(dest.get(0).getName(), "test");
+        assertEquals(dest.get(0).getValues().length, 1);
+        assertEquals(dest.get(0).getValues()[0], "a");
+
+        assertEquals(dest.get(1).getValues().length, 1);
+        assertEquals(dest.get(1).getName(), "test");
+        assertEquals(dest.get(1).getValues()[0], "b");
+
+        assertEquals(dest.get(2).getValues().length, 1);
+        assertEquals(dest.get(2).getName(), "test");
+        assertEquals(dest.get(2).getValues()[0], "c");
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testExpandRaisesExceptionWhenBothValuesAreNull() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        Optional<String> nullValue = Optional.absent();
+        QueryOption config = new QueryOption("test", nullValue, nullValues, false);
+        config.expand();
+    }
+
+    @Test
+    public void testUnExpandBrace() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        QueryOption config = new QueryOption("test", Optional.of("{awesome1,awesome2,awesome3}"), nullValues, false);
+        List<QueryOption.Query> dest = config.expand();
+        assertEquals(dest.size(), 1);
+        assertEquals(dest.get(0).getName(), "test");
+        assertEquals(dest.get(0).getValues().length, 1);
+        assertEquals(dest.get(0).getValues()[0], "{awesome1,awesome2,awesome3}");
+    }
+
+    @Test
+    public void testExpandBrace() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        QueryOption config = new QueryOption("test", Optional.of("{awesome1,awesome2,awesome3}"), nullValues, true);
+        List<QueryOption.Query> dest = config.expand();
+        assertEquals(dest.size(), 3);
+        assertEquals(dest.get(0).getName(), "test");
+        assertEquals(dest.get(0).getValues().length, 1);
+        assertEquals(dest.get(0).getValues()[0], "awesome1");
+        assertEquals(dest.get(1).getName(), "test");
+
+        assertEquals(dest.get(1).getValues().length, 1);
+        assertEquals(dest.get(1).getValues()[0], "awesome2");
+
+        assertEquals(dest.get(2).getValues().length, 1);
+        assertEquals(dest.get(2).getName(), "test");
+        assertEquals(dest.get(2).getValues()[0], "awesome3");
+    }
+
+    @Test
+    public void testExpandEscapedBrace() throws Exception
+    {
+        Optional<List<String>> nullValues = Optional.absent();
+        QueryOption config = new QueryOption("test", Optional.of("{awe\\,some1,awes\\{ome2,awes\\}ome3}"), nullValues, true);
+        List<QueryOption.Query> dest = config.expand();
+        assertEquals(dest.get(0).getName(), "test");
+        assertEquals(dest.get(0).getValues().length, 1);
+        assertEquals(dest.get(0).getValues()[0], "awe,some1");
+
+        assertEquals(dest.get(1).getName(), "test");
+        assertEquals(dest.get(1).getValues().length, 1);
+        assertEquals(dest.get(1).getValues()[0], "awes{ome2");
+
+        assertEquals(dest.get(2).getName(), "test");
+        assertEquals(dest.get(2).getValues().length, 1);
+        assertEquals(dest.get(2).getValues()[0], "awes}ome3");
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/test/java/org/embulk/input/s3/TestAbstractS3FileInputPlugin.java

+package org.embulk.input.s3;
+
+import com.amazonaws.AmazonServiceException;
+import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.model.GetObjectMetadataRequest;
+import com.amazonaws.services.s3.model.ListObjectsRequest;
+import com.amazonaws.services.s3.model.ObjectListing;
+import com.amazonaws.services.s3.model.ObjectMetadata;
+import com.google.common.base.Optional;
+import org.apache.http.HttpStatus;
+import org.embulk.EmbulkTestRuntime;
+import org.embulk.spi.util.RetryExecutor;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.mock;
+
+public class TestAbstractS3FileInputPlugin
+{
+    private static RetryExecutor retryExecutor()
+    {
+        return RetryExecutor.retryExecutor()
+                .withInitialRetryWait(0)
+                .withMaxRetryWait(0);
+    }
+
+    private static AbstractS3FileInputPlugin dummyS3Plugin()
+    {
+        return new AbstractS3FileInputPlugin()
+        {
+            @Override
+            protected Class<? extends PluginTask> getTaskClass()
+            {
+                return PluginTask.class;
+            }
+        };
+    }
+
+    private static class SomeException extends RuntimeException
+    {
+    }
+
+    @Rule
+    public EmbulkTestRuntime runtime = new EmbulkTestRuntime();
+
+    private AmazonS3 client;
+
+    @Before
+    public void createResources()
+    {
+        client = mock(AmazonS3.class);
+    }
+
+    @Test
+    public void listS3FilesByPrefix()
+    {
+        doReturn(new ObjectListing()).when(client).listObjects(any(ListObjectsRequest.class));
+        FileList.Builder builder = new FileList.Builder();
+        dummyS3Plugin().listS3FilesByPrefix(builder, client, "some_bucket", "some_prefix", Optional.of("last_path"), true);
+    }
+
+    @Test
+    public void listS3FileByPrefix_with_retry()
+    {
+        doThrow(new RuntimeException()).doReturn(new ObjectListing())
+                .when(client).listObjects(any(ListObjectsRequest.class));
+        FileList.Builder builder = new FileList.Builder();
+        dummyS3Plugin().listS3FilesByPrefix(
+                builder, client, "some_bucket", "some_prefix", Optional.of("last_path"), true,
+                retryExecutor().withRetryLimit(1));
+    }
+
+    @Test(expected = SomeException.class)
+    public void listS3FileByPrefix_on_retry_gave_up_should_throw_the_original_exception()
+    {
+        doThrow(new SomeException()).doReturn(new ObjectListing())
+                .when(client).listObjects(any(ListObjectsRequest.class));
+        FileList.Builder builder = new FileList.Builder();
+        dummyS3Plugin().listS3FilesByPrefix(
+                builder, client, "some_bucket", "some_prefix", Optional.of("last_path"), true,
+                retryExecutor().withRetryLimit(0));
+    }
+
+    @Test(expected = AmazonServiceException.class)
+    public void listS3FileByPrefix_on_retry_gave_up_should_throw_the_original_exception_in_forbidden_code()
+    {
+        AmazonServiceException exception = new AmazonServiceException("Forbidden exception");
+        exception.setStatusCode(HttpStatus.SC_FORBIDDEN);
+        exception.setErrorType(AmazonServiceException.ErrorType.Client);
+
+        doThrow(exception).doReturn(new ObjectListing())
+                .when(client).listObjects(any(ListObjectsRequest.class));
+        FileList.Builder builder = new FileList.Builder();
+        dummyS3Plugin().listS3FilesByPrefix(
+                builder, client, "some_bucket", "some_prefix", Optional.of("last_path"), true,
+                retryExecutor().withRetryLimit(1));
+    }
+
+    @Test(expected = AmazonServiceException.class)
+    public void listS3FileByPrefix_on_retry_gave_up_should_throw_the_original_exception_in_methodnotallow_code()
+    {
+        AmazonServiceException exception = new AmazonServiceException("method not allow exception");
+        exception.setStatusCode(HttpStatus.SC_METHOD_NOT_ALLOWED);
+        exception.setErrorType(AmazonServiceException.ErrorType.Client);
+
+        doThrow(exception).doReturn(new ObjectListing())
+                .when(client).listObjects(any(ListObjectsRequest.class));
+        FileList.Builder builder = new FileList.Builder();
+        dummyS3Plugin().listS3FilesByPrefix(
+                builder, client, "some_bucket", "some_prefix", Optional.of("last_path"), true,
+                retryExecutor().withRetryLimit(1));
+    }
+
+    @Test(expected = AmazonServiceException.class)
+    public void listS3FileByPrefix_on_retry_gave_up_should_throw_the_original_exception_in_expiredToken_code()
+    {
+        AmazonServiceException exception = new AmazonServiceException("expired token exception");
+        exception.setStatusCode(HttpStatus.SC_BAD_REQUEST);
+        exception.setErrorCode("ExpiredToken");
+        exception.setErrorType(AmazonServiceException.ErrorType.Client);
+
+        doThrow(exception).doReturn(new ObjectListing())
+                .when(client).listObjects(any(ListObjectsRequest.class));
+        FileList.Builder builder = new FileList.Builder();
+        dummyS3Plugin().listS3FilesByPrefix(
+                builder, client, "some_bucket", "some_prefix", Optional.of("last_path"), true,
+                retryExecutor().withRetryLimit(1));
+    }
+
+    @Test
+    public void addS3DirectObject()
+    {
+        doReturn(new ObjectMetadata()).when(client).getObjectMetadata(any(GetObjectMetadataRequest.class));
+        FileList.Builder builder = new FileList.Builder().pathMatchPattern("");
+        dummyS3Plugin().addS3DirectObject(builder, client, "some_bucket", "some_prefix");
+    }
+
+    @Test
+    public void addS3DirectObject_with_retry()
+    {
+        doThrow(new RuntimeException()).doReturn(new ObjectMetadata())
+                .when(client).getObjectMetadata(any(GetObjectMetadataRequest.class));
+        FileList.Builder builder = new FileList.Builder().pathMatchPattern("");
+        dummyS3Plugin().addS3DirectObject(
+                builder, client, "some_bucket", "some_prefix",
+                retryExecutor());
+    }
+
+    @Test(expected = SomeException.class)
+    public void addS3DirectObject_on_retry_gave_up_should_throw_original_exception()
+    {
+        doThrow(new SomeException()).doReturn(new ObjectMetadata())
+                .when(client).getObjectMetadata(any(GetObjectMetadataRequest.class));
+        FileList.Builder builder = new FileList.Builder().pathMatchPattern("");
+        dummyS3Plugin().addS3DirectObject(
+                builder, client, "some_bucket", "some_prefix",
+                retryExecutor().withRetryLimit(0));
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/test/java/org/embulk/input/s3/TestAwsCredentials.java

+package org.embulk.input.s3;
+
+import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import com.amazonaws.auth.BasicAWSCredentials;
+import com.amazonaws.auth.BasicSessionCredentials;
+import com.amazonaws.auth.policy.Policy;
+import com.amazonaws.auth.policy.Resource;
+import com.amazonaws.auth.policy.Statement;
+import com.amazonaws.auth.policy.actions.S3Actions;
+import com.amazonaws.services.securitytoken.AWSSecurityTokenService;
+import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClientBuilder;
+import com.amazonaws.services.securitytoken.model.Credentials;
+import com.amazonaws.services.securitytoken.model.GetFederationTokenRequest;
+import com.amazonaws.services.securitytoken.model.GetFederationTokenResult;
+import org.embulk.EmbulkTestRuntime;
+import org.embulk.config.ConfigDiff;
+import org.embulk.config.ConfigSource;
+import org.embulk.input.s3.TestS3FileInputPlugin.Control;
+import org.embulk.spi.FileInputRunner;
+import org.embulk.spi.TestPageBuilderReader;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+
+import static org.embulk.input.s3.TestS3FileInputPlugin.assertRecords;
+import static org.embulk.input.s3.TestS3FileInputPlugin.parserConfig;
+import static org.embulk.input.s3.TestS3FileInputPlugin.schemaConfig;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assume.assumeNotNull;
+
+public class TestAwsCredentials
+{
+    private static String EMBULK_S3_TEST_BUCKET;
+    private static String EMBULK_S3_TEST_ACCESS_KEY_ID;
+    private static String EMBULK_S3_TEST_SECRET_ACCESS_KEY;
+    private static final String EMBULK_S3_TEST_PATH_PREFIX = "embulk_input_s3_test";
+
+    /*
+     * This test case requires environment variables:
+     *   EMBULK_S3_TEST_BUCKET
+     *   EMBULK_S3_TEST_ACCESS_KEY_ID
+     *   EMBULK_S3_TEST_SECRET_ACCESS_KEY
+     * If the variables not set, the test case is skipped.
+     */
+    @BeforeClass
+    public static void initializeConstantVariables()
+    {
+        EMBULK_S3_TEST_BUCKET = System.getenv("EMBULK_S3_TEST_BUCKET");
+        EMBULK_S3_TEST_ACCESS_KEY_ID = System.getenv("EMBULK_S3_TEST_ACCESS_KEY_ID");
+        EMBULK_S3_TEST_SECRET_ACCESS_KEY = System.getenv("EMBULK_S3_TEST_SECRET_ACCESS_KEY");
+        assumeNotNull(EMBULK_S3_TEST_BUCKET, EMBULK_S3_TEST_ACCESS_KEY_ID, EMBULK_S3_TEST_SECRET_ACCESS_KEY);
+    }
+
+    @Rule
+    public EmbulkTestRuntime runtime = new EmbulkTestRuntime();
+
+    private ConfigSource config;
+    private FileInputRunner runner;
+    private TestPageBuilderReader.MockPageOutput output;
+
+    @Before
+    public void createResources()
+    {
+        config = runtime.getExec().newConfigSource()
+                .set("type", "s3")
+                .set("bucket", EMBULK_S3_TEST_BUCKET)
+                .set("path_prefix", EMBULK_S3_TEST_PATH_PREFIX)
+                .set("parser", parserConfig(schemaConfig()));
+        runner = new FileInputRunner(runtime.getInstance(S3FileInputPlugin.class));
+        output = new TestPageBuilderReader.MockPageOutput();
+    }
+
+    private void doTest(ConfigSource config)
+    {
+        ConfigDiff configDiff = runner.transaction(config, new Control(runner, output));
+
+        assertEquals(EMBULK_S3_TEST_PATH_PREFIX + "/sample_01.csv", configDiff.get(String.class, "last_path"));
+        assertRecords(config, output);
+    }
+
+    @Test
+    public void useBasic()
+    {
+        ConfigSource config = this.config.deepCopy()
+                .set("auth_method", "basic")
+                .set("access_key_id", EMBULK_S3_TEST_ACCESS_KEY_ID)
+                .set("secret_access_key", EMBULK_S3_TEST_SECRET_ACCESS_KEY);
+        doTest(config);
+    }
+
+    @Test
+    public void useEnv()
+    {
+        // TODO
+    }
+
+    @Test
+    public void useInstance()
+    {
+        // TODO
+    }
+
+    @Test
+    public void useProfile()
+    {
+        // TODO
+    }
+
+    @Test
+    public void useProperties()
+    {
+        String origAccessKeyId = System.getProperty("aws.accessKeyId");
+        String origSecretKey = System.getProperty("aws.secretKey");
+        try {
+            ConfigSource config = this.config.deepCopy().set("auth_method", "properties");
+            System.setProperty("aws.accessKeyId", EMBULK_S3_TEST_ACCESS_KEY_ID);
+            System.setProperty("aws.secretKey", EMBULK_S3_TEST_SECRET_ACCESS_KEY);
+            doTest(config);
+        }
+        finally {
+            if (origAccessKeyId != null) {
+                System.setProperty("aws.accessKeyId", origAccessKeyId);
+            }
+            if (origSecretKey != null) {
+                System.setProperty("aws.secretKey", origAccessKeyId);
+            }
+        }
+    }
+
+    @Test
+    public void useAnonymous()
+    {
+        // TODO
+    }
+
+    @Test
+    public void useSession()
+    {
+        BasicSessionCredentials sessionCredentials = getSessionCredentials();
+        ConfigSource config = this.config.deepCopy()
+                .set("auth_method", "session")
+                .set("access_key_id", sessionCredentials.getAWSAccessKeyId())
+                .set("secret_access_key", sessionCredentials.getAWSSecretKey())
+                .set("session_token", sessionCredentials.getSessionToken());
+        doTest(config);
+    }
+
+    private static BasicSessionCredentials getSessionCredentials()
+    {
+        AWSSecurityTokenService stsClient = AWSSecurityTokenServiceClientBuilder.standard().withCredentials(
+                new AWSStaticCredentialsProvider(new BasicAWSCredentials(EMBULK_S3_TEST_ACCESS_KEY_ID, EMBULK_S3_TEST_SECRET_ACCESS_KEY))
+        ).build();
+
+        GetFederationTokenRequest getFederationTokenRequest = new GetFederationTokenRequest();
+        getFederationTokenRequest.setDurationSeconds(7200);
+        getFederationTokenRequest.setName("dummy");
+
+        Policy policy = new Policy().withStatements(new Statement(Statement.Effect.Allow)
+                .withActions(S3Actions.ListObjects, S3Actions.GetObject)
+                .withResources(
+                        new Resource("arn:aws:s3:::" + EMBULK_S3_TEST_BUCKET + "/" + EMBULK_S3_TEST_PATH_PREFIX + "/*"),
+                        new Resource("arn:aws:s3:::" + EMBULK_S3_TEST_BUCKET)));
+        getFederationTokenRequest.setPolicy(policy.toJson());
+
+        GetFederationTokenResult federationTokenResult = stsClient.getFederationToken(getFederationTokenRequest);
+        Credentials sessionCredentials = federationTokenResult.getCredentials();
+
+        return new BasicSessionCredentials(
+                sessionCredentials.getAccessKeyId(),
+                sessionCredentials.getSecretAccessKey(),
+                sessionCredentials.getSessionToken());
+    }
+}

ebulk-data/embulk-wendelin-dataset-tool/src/test/java/org/embulk/input/s3/TestDefaultRetryable.java

+package org.embulk.input.s3;
+
+import org.embulk.EmbulkTestRuntime;
+import org.embulk.spi.util.RetryExecutor;
+import org.embulk.spi.util.RetryExecutor.RetryGiveupException;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.concurrent.Callable;
+
+import static java.lang.String.format;
+import static org.msgpack.core.Preconditions.checkArgument;
+
+public class TestDefaultRetryable
+{
+    @Rule
+    public EmbulkTestRuntime runtime = new EmbulkTestRuntime();  // require for DefaultRetryable's logger
+
+    private static class Deny extends RuntimeException implements Callable
+    {
+        private int pastCalls = 0;
+        private final int targetCalls;
+        private Exception exception;
+
+        Deny(int targetCalls)
+        {
+            super(format("Try harder! (Will pass after %d calls)", targetCalls));
+            checkArgument(targetCalls >= 0);
+            this.targetCalls = targetCalls;
+        }
+
+        static Deny until(int calls)
+        {
+            return new Deny(calls);
+        }
+
+        Deny with(Exception exception)
+        {
+            this.exception = exception;
+            return this;
+        }
+
+        @Override
+        public Object call() throws Exception
+        {
+            if (pastCalls < targetCalls) {
+                pastCalls++;
+                if (exception != null) {
+                    throw exception;
+                }
+                else {
+                    throw this;
+                }
+            }
+            pastCalls++;
+            return null;
+        }
+    }
+
+    private static RetryExecutor retryExecutor()
+    {
+        return RetryExecutor.retryExecutor()
+                .withInitialRetryWait(0)
+                .withMaxRetryWait(0);
+    }
+
+    @Test
+    @SuppressWarnings("unchecked")
+    public void guarantee_retry_attempts_just_like_Retryable() throws Exception
+    {
+        retryExecutor()
+                .withRetryLimit(0)
+                .run(new DefaultRetryable(Deny.until(0)));
+        retryExecutor()
+                .withRetryLimit(1)
+                .run(new DefaultRetryable(Deny.until(1)));
+        retryExecutor()
+                .withRetryLimit(2)
+                .run(new DefaultRetryable(Deny.until(1)));
+        retryExecutor()
+                .withRetryLimit(3)
+                .run(new DefaultRetryable(Deny.until(2)));
+    }
+
+    @Test(expected = RetryGiveupException.class)
+    @SuppressWarnings("unchecked")
+    public void fail_after_exceeding_attempts_just_like_Retryable() throws Exception
+    {
+        retryExecutor()
+                .withRetryLimit(3)
+                .run(new DefaultRetryable(Deny.until(4)));
+    }
+
+    @Test(expected = Deny.class)
+    @SuppressWarnings("unchecked")
+    public void execute_should_unwrap_RetryGiveupException() throws Exception
+    {
+        new DefaultRetryable(Deny.until(4))
+                .executeWith(retryExecutor().withRetryLimit(3));
+    }
+
+    @Test(expected = RuntimeException.class)
+    @SuppressWarnings("unchecked")
+    public void execute_should_unwrap_RetryGiveupException_but_rewrap_checked_exception_in_a_RuntimeException()
+    {
+        new DefaultRetryable(Deny.until(4).with(new Exception("A checked exception")))
+                .executeWith(retryExecutor().withRetryLimit(3));
+    }
+
+    @Test(expected = IOException.class)
+    public void executeAndPropagateAsIs_should_leave_original_exception_unwrapped() throws IOException
+    {
+        RetryExecutor retryExc = retryExecutor().withRetryLimit(3);
+        // An explicit type parameter for operation return type is needed here,
+        // Without one, javac (at least on 1.8) will fails to infer the X exception type parameter.
+        new DefaultRetryable<Object>() {
+            @Override
+            public Object call() throws IOException
+            {
+                throw new IOException();
+            }
+        }.executeWithCheckedException(retryExc, IOException.class);
+    }
+
+    @Test(expected = IllegalStateException.class)
+    public void execute_without_an_implementation_should_throw_an_IllegalStateException()
+    {
+        new DefaultRetryable().executeWith(retryExecutor());
+    }
+}