OPCUA to HTTP Gateway

See merge request !35

slapos/software/opcua-to-http-gw/README.md

+# OPCUA to HTTP Gateway
+
+## When instantiating OPCUA you can use the following example config:
+```
+release="https://lab.nexedi.com/nexedi/osie/blob/master/slapos/software/opcua-to-http-gw/software.cfg"
+supply(release, "COMP-****")
+partition_parameter_kw = {
+  "erp5-url": "<URL>",
+  "erp5-username": "<USERNAME>",
+  "erp5-password": "<PASSWORD>",
+  "opcua-port": <PORT>
+}
+filter_kw = { "computer_guid": "COMP-****" }
+request(software_release=release, partition_reference="****", partition_parameter_kw=partition_parameter_kw, filter_kw=filter_kw)
+```

slapos/software/opcua-to-http-gw/buildout.hash.cfg

+[instance-profile]
+filename = instance.cfg.in
+md5sum = 6fbae8f850e2c38b9b9990bf9c087505

slapos/software/opcua-to-http-gw/instance-input-schema.json

+{
+  "$schema": "https://json-schema.org/draft/2019-09/schema",
+  "description": "Parameters to instantiate OPCUA",
+  "type": "object",
+  "configuration": {
+    "erp5-url": {
+      "description": "The URL of the ERP5 server to connect to.",
+      "type": "string",
+      "default": ""
+    },
+    "erp5-username": {
+      "description": "The username for authentication to the ERP5 server.",
+      "type": "string",
+      "default": ""
+    },
+    "erp5-password": {
+      "description": "The password for authentication to the ERP5 server.",
+      "type": "string",
+      "default": ""
+    },
+    "opcua-port": {
+      "description": "The port for OPCUA server.",
+      "type": "int",
+      "default": "4840"
+    }
+  }
+}

slapos/software/opcua-to-http-gw/instance.cfg.in

+[buildout]
+parts =
+  promises
+  directory
+  opcua-to-http-gw-service
+  publish-connection-parameter
+
+eggs-directory = {{ buildout["eggs-directory"] }}
+develop-eggs-directory = {{ buildout["develop-eggs-directory"] }}
+offline = true
+
+[check-port-listening-promise]
+recipe = slapos.cookbook:check_port_listening
+path = ${directory:promise}/${:_buildout_section_name_}
+
+[directory]
+recipe = slapos.cookbook:mkdirectory
+home = ${buildout:directory}
+etc = ${:home}/etc
+var = ${:home}/var
+script = ${:etc}/run/
+service = ${:etc}/service
+promise = ${:etc}/promise/
+log = ${:var}/log
+bin = ${:home}/bin
+
+[instance-parameter]
+recipe = slapos.cookbook:slapconfiguration
+computer = ${slap-connection:computer-id}
+partition = ${slap-connection:partition-id}
+url = ${slap-connection:server-url}
+key = ${slap-connection:key-file}
+cert = ${slap-connection:cert-file}
+configuration.opcua-port = 4840
+
+[opcua-to-http-gw-service]
+recipe = slapos.cookbook:wrapper
+command-line = {{ interpreter_location }}/py {{ osie_repository_location }}/opcua-to-http-gw/opcua-to-http-gw.py --xml {{ osie_repository_location }}/opcua-to-http-gw/opcua-server-config.xml --erp5-url ${instance-parameter:configuration.erp5-url} --erp5-username ${instance-parameter:configuration.erp5-username} --erp5-password ${instance-parameter:configuration.erp5-password} --port ${instance-parameter:configuration.opcua-port} --ip ${instance-parameter:ipv4-random}
+wrapper-path = ${directory:service}/opcua-to-http-gw-service
+output = $${:wrapper-path}
+
+[opcua-to-http-gw-listen-promise-ipv4]
+<= check-port-listening-promise
+hostname = ${instance-parameter:ipv4-random}
+port = ${instance-parameter:configuration.opcua-port}
+
+[promises]
+recipe =
+instance-promises =
+  ${opcua-to-http-gw-listen-promise-ipv4:path}
+
+[publish-connection-parameter]
+recipe = slapos.cookbook:publish
+ipv4 = ${instance-parameter:ipv4-random}

slapos/software/opcua-to-http-gw/software.cfg

+[buildout]
+allow-picked-versions = true
+
+extends =
+  buildout.hash.cfg
+  https://lab.nexedi.com/nexedi/slapos/raw/master/stack/monitor/buildout.cfg
+  https://lab.nexedi.com/nexedi/slapos/raw/master/stack/slapos.cfg
+  https://lab.nexedi.com/nexedi/slapos/raw/master/component/python3/buildout.cfg
+  https://lab.nexedi.com/nexedi/slapos/raw/master/component/git/buildout.cfg
+
+parts = 
+  interpreter
+  slapos-cookbook
+  osie-repository
+  instance-profile
+
+[python]
+part = python3
+
+[interpreter]
+recipe = zc.recipe.egg:scripts
+interpreter = py
+eggs =
+  requests
+  asyncua
+
+[osie-repository]
+recipe  = slapos.recipe.build:gitclone
+git-executable = ${git:location}/bin/git
+repository = https://lab.nexedi.com/nexedi/osie.git
+location = ${buildout:parts-directory}/osie
+
+[versions]
+aiosqlite = 0.17.0
+aiofiles = 23.1.0
+
+[instance-profile]
+recipe = slapos.recipe.template:jinja2
+template = ${:_profile_base_location_}/instance.cfg.in
+rendered = ${buildout:directory}/instance.cfg
+context =
+  section buildout buildout
+  key interpreter_location buildout:bin-directory
+  key osie_repository_location osie-repository:location