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nexedi
osie
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1d06b719
Commit
1d06b719
authored
Jul 27, 2023
by
Ivan Tyagov
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Initial import of Levin's work.
parent
2e0960ca
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opcua-to-http-gw/opcua-to-http-gw.py
opcua-to-http-gw/opcua-to-http-gw.py
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1d06b719
#!//usr/bin/python
"""
Basic OPC UA <-> HTTP gateway server.
"""
import
sys
import
asyncio
import
asyncua
from
dataclasses
import
dataclass
,
field
import
json
import
requests
import
urllib
import
argparse
import
logging
# #################################
# Configure
parser
=
argparse
.
ArgumentParser
(
description
=
'Run OPCUA Server.'
)
a
=
parser
.
add_argument
a
(
'--ip'
,
help
=
'The IP address on which the OPCUA Server runs'
,
default
=
"127.0.0.1"
)
a
(
'--port'
,
help
=
'The port on which the OPCUA Server runs'
,
default
=
"4840"
)
a
(
'--xml'
,
help
=
'Path of XML to configure Server. See asyncua doc for more details.'
,
default
=
None
)
a
(
'--erp5-ip'
,
help
=
'IP of ERP5 instance to which data shall be send.'
,
default
=
None
)
a
(
'--erp5-port'
,
help
=
'Port of ERP5 instance to which data shall be send.'
,
default
=
None
)
args
=
parser
.
parse_args
()
ip
,
port
,
xml
,
erp5_ip
,
erp5_port
=
args
.
ip
,
args
.
port
,
args
.
xml
,
args
.
erp5_ip
,
args
.
erp5_port
# #################################
# Define ERP5Handler
@
dataclass
(
frozen
=
True
)
class
ERP5Handler
(
asyncua
.
common
.
subscription
.
SubHandler
):
ip
:
str
port
:
str
session
:
requests
.
Session
=
field
(
default_factory
=
requests
.
Session
)
@
property
def
uri
(
self
):
return
f"http://
{
self
.
ip
}
:
{
self
.
port
}
/erp5/opcua_test"
def
call
(
self
,
**
data
):
params
=
urllib
.
parse
.
quote_plus
(
json
.
dumps
({
k
:
str
(
v
)
for
k
,
v
in
data
.
items
()}))
self
.
session
.
post
(
f"
{
self
.
uri
}
?data=
{
params
}
"
)
def
datachange_notification
(
self
,
node
,
val
,
data
):
self
.
call
(
node
=
node
,
val
=
val
,
data
=
data
)
def
event_notification
(
self
,
event
):
self
.
call
(
event
=
event
)
erp5_handler
=
None
if
erp5_ip
is
not
None
and
erp5_port
is
not
None
:
erp5_handler
=
ERP5Handler
(
erp5_ip
,
erp5_port
)
class
InternalSession
(
asyncua
.
server
.
internal_session
.
InternalSession
):
async
def
read
(
self
,
params
):
erp5_handler
.
call
(
params
=
params
)
return
await
super
().
read
(
params
)
# #################################
# Start OPCUA Server
async
def
main
():
_logger
=
logging
.
getLogger
(
__name__
)
# setup our server
server
=
asyncua
.
Server
()
await
server
.
init
()
server
.
set_endpoint
(
f"opc.tcp://
{
ip
}
:
{
port
}
/freeopcua/server/"
)
if
xml
is
not
None
:
await
server
.
import_xml
(
xml
)
if
erp5_handler
:
subscription
=
await
server
.
create_subscription
(
1000
,
erp5_handler
)
await
subscription
.
subscribe_events
()
nodes
=
await
asyncua
.
common
.
ua_utils
.
get_nodes_of_namespace
(
server
)
await
subscription
.
subscribe_data_change
(
nodes
)
def
create_session
(
name
,
user
=
asyncua
.
server
.
users
.
User
(
role
=
asyncua
.
server
.
users
.
UserRole
.
Anonymous
),
external
=
False
):
self
=
server
.
iserver
return
InternalSession
(
self
,
self
.
aspace
,
self
.
subscription_service
,
name
,
user
=
user
,
external
=
external
)
server
.
iserver
.
create_session
=
create_session
_logger
.
info
(
"Added subscription for erp5 handler."
)
_logger
.
info
(
"Starting server!"
)
async
with
server
:
while
True
:
await
asyncio
.
sleep
(
1
)
logging
.
basicConfig
(
level
=
logging
.
DEBUG
)
asyncio
.
run
(
main
(),
debug
=
True
)
import
__main__
if
__name__
==
'__main__'
:
sys
.
exit
(
__main__
.
main
())
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