def handle_sse(self, path, suffix, env, start_response):
res_path = path
# Append slash to resource path if URL ends with slash
if suffix.endswith('/'):
res_path += '/'
req_hdrs = self.get_headers(env)
# Check route is a Django-RT resource
try:
logger.debug('Verifying %s is an RT resource' % (res_path, ))
verify_resource_view(res_path)
except NotAnRtResourceError:
logger.debug('Not an RT resource; aborting')
start_response(self.full_status(406), [])
return [b'']
except ResourceError as e:
logger.debug('Caught ResourceError; aborting')
start_response(self.full_status(e.status), [])
return [b'']
# Connect to Redis server
redis_conn = redis.StrictRedis(host=settings.RT_REDIS_HOST,
port=settings.RT_REDIS_PORT,
db=settings.RT_REDIS_DB,
password=settings.RT_REDIS_PASSWORD)
# Create subscription
while True:
sub_id = generate_subscription_id()
result = redis_conn.setnx(get_subscription_key(sub_id),
'requested')
if result:
break
logger.debug('Created subscription ID: %s' % (sub_id, ))
# Request resource from Django API
try:
logger.debug('Requesting subscription for %s' % (res_path, ))
res = self.request_resource(path, sub_id, req_hdrs)
except NotAnRtResourceError:
logger.debug(
"Subscription denied: not an rt resource. This shouldn't happen..."
)
start_response(self.full_status(406), [])
return [b'']
except ResourceError as e:
logger.debug('Subscription denied: HTTP error %d' % (e.status, ))
start_response(self.full_status(e.status), [])
return [b'']
# Check subscription status and change to 'subscribed'
sub_key = get_subscription_key(sub_id)
sub_status = redis_conn.get(sub_key).decode('utf-8')
assert sub_status == 'granted'
logger.debug('Subscription granted')
if redis_conn.set(sub_key, 'subscribed'):
logger.debug('Subscription %s status changed to "subscribed"' %
(sub_id, ))
# Delete subscription key (not currently used for anything else)
redis_conn.delete(sub_key)
# Subscribe to Redis channel
pubsub = redis_conn.pubsub()
pubsub.subscribe(get_full_channel_name(res.channel))
# Prepare response
hdrs = {'Content-Type': 'text/event-stream'}
cors_hdrs = get_cors_headers(req_hdrs.get('ORIGIN', None))
hdrs.update(cors_hdrs)
start_response('200 OK', [hdr for hdr in hdrs.items()])
# Loop
first_event = True
while True:
# Wait for event on channel
msg = pubsub.get_message(
timeout=settings.RT_SSE_HEARTBEAT if settings.
RT_SSE_HEARTBEAT else (10 * 60.0))
if msg:
if msg['type'] == 'message':
# Deserialize ResourceEvent
event_json = msg['data'].decode('utf-8')
event = ResourceEvent.from_json(event_json)
# Create SSE event
sse_evt = SseEvent.from_resource_event(event)
# Send 'retry' field on first SSE event delivered
if first_event:
sse_evt.retry = settings.RT_SSE_RETRY
first_event = False
# Send SSE event to client
yield sse_evt.as_utf8()
else:
# Timeout, send SSE heartbeat if necessary
if settings.RT_SSE_HEARTBEAT:
yield SseHeartbeat().as_utf8()
def handle_sse(self, request):
res_path = request.match_info.get('resource')
res_path = '/' + res_path
# Append slash to resource path if URL ends with slash
suffix = request.match_info.get('suffix')
if suffix.endswith('/'):
res_path += '/'
redis_conn = None
redis_subscription = None
sub_id = None
try:
# Check route is a Django-RT resource
try:
logger.debug('Verifying %s is an RT resource' % (res_path,))
verify_resource_view(res_path)
except NotAnRtResourceError:
logger.debug('Not an RT resource; aborting')
return web.Response(status=406)
except ResourceError as e:
logger.debug('Caught ResourceError; aborting')
return web.Response(status=e.status)
# Connect to Redis server
redis_conn = yield from asyncio_redis.Connection.create(
host=settings.RT_REDIS_HOST,
port=settings.RT_REDIS_PORT,
db=settings.RT_REDIS_DB,
password=settings.RT_REDIS_PASSWORD
)
# Create subscription
while True:
sub_id = generate_subscription_id()
result = yield from redis_conn.setnx(get_subscription_key(sub_id), 'requested')
if result:
break
logger.debug('Created subscription ID: %s' % (sub_id,))
# Request resource from Django API
try:
logger.debug('Requesting subscription for %s' % (res_path,))
res = yield from self.request_resource(res_path, request, sub_id)
except NotAnRtResourceError:
logger.debug("Subscription denied: not an rt resource. This shouldn't happen...")
return web.Response(status=406)
except ResourceError as e:
logger.debug('Subscription denied: HTTP error %d' % (e.status,))
return web.Response(status=e.status)
# Check subscription status and change to 'subscribed'
sub_key = get_subscription_key(sub_id)
sub_status = yield from redis_conn.get(sub_key)
assert sub_status == 'granted'
logger.debug('Subscription granted')
result = yield from redis_conn.set(sub_key, 'subscribed')
if result:
logger.debug('Subscription %s status changed to "subscribed"' % (sub_id,))
# Delete subscription key (not currently used for anything else)
yield from redis_conn.delete([sub_key])
# Subscribe to Redis channel
chan = get_full_channel_name(res.channel)
logger.debug('Subscribing to Redis channel %s' % (chan,))
redis_subscription = yield from redis_conn.start_subscribe()
yield from redis_subscription.subscribe([ chan ])
# Prepare response
response = web.StreamResponse()
response.content_type = 'text/event-stream'
cors_hdrs = get_cors_headers(request.headers.get('Origin', None))
response.headers.update(cors_hdrs)
yield from response.prepare(request)
# Loop
first_event = True
while True:
# Wait for event on channel
try:
reply = yield from asyncio.wait_for(
redis_subscription.next_published(),
settings.RT_SSE_HEARTBEAT
)
except asyncio.TimeoutError:
# Timeout, send SSE heartbeat
response.write(SseHeartbeat().as_utf8())
yield from response.drain()
else:
# Deserialize ResourceEvent
event = ResourceEvent.from_json(reply.value)
# Create SSE event
sse_evt = SseEvent.from_resource_event(event)
# Send 'retry' field on first SSE event delivered
if first_event:
sse_evt.retry = settings.RT_SSE_RETRY
first_event = False
# Send SSE event to client
response.write(sse_evt.as_utf8())
yield from response.drain()
yield from response.write_eof()
return response
finally:
# Cleanup
asyncio.async(self.cleanup_request(sub_id, redis_conn, redis_subscription))
def handle_sse(self, path, suffix, env, start_response):
res_path = path
# Append slash to resource path if URL ends with slash
if suffix.endswith("/"):
res_path += "/"
req_hdrs = self.get_headers(env)
# Check route is a Django-RT resource
try:
logger.debug("Verifying %s is an RT resource" % (res_path,))
verify_resource_view(res_path)
except NotAnRtResourceError:
logger.debug("Not an RT resource; aborting")
start_response(self.full_status(406), [])
return [b""]
except ResourceError as e:
logger.debug("Caught ResourceError; aborting")
start_response(self.full_status(e.status), [])
return [b""]
# Connect to Redis server
redis_conn = redis.StrictRedis(
host=settings.RT_REDIS_HOST,
port=settings.RT_REDIS_PORT,
db=settings.RT_REDIS_DB,
password=settings.RT_REDIS_PASSWORD,
)
# Create subscription
while True:
sub_id = generate_subscription_id()
result = redis_conn.setnx(get_subscription_key(sub_id), "requested")
if result:
break
logger.debug("Created subscription ID: %s" % (sub_id,))
# Request resource from Django API
try:
logger.debug("Requesting subscription for %s" % (res_path,))
res = self.request_resource(path, sub_id, req_hdrs)
except NotAnRtResourceError:
logger.debug("Subscription denied: not an rt resource. This shouldn't happen...")
start_response(self.full_status(406), [])
return [b""]
except ResourceError as e:
logger.debug("Subscription denied: HTTP error %d" % (e.status,))
start_response(self.full_status(e.status), [])
return [b""]
# Check subscription status and change to 'subscribed'
sub_key = get_subscription_key(sub_id)
sub_status = redis_conn.get(sub_key).decode("utf-8")
assert sub_status == "granted"
logger.debug("Subscription granted")
if redis_conn.set(sub_key, "subscribed"):
logger.debug('Subscription %s status changed to "subscribed"' % (sub_id,))
# Delete subscription key (not currently used for anything else)
redis_conn.delete(sub_key)
# Subscribe to Redis channel
pubsub = redis_conn.pubsub()
pubsub.subscribe(get_full_channel_name(res.channel))
# Prepare response
hdrs = {"Content-Type": "text/event-stream"}
cors_hdrs = get_cors_headers(req_hdrs.get("ORIGIN", None))
hdrs.update(cors_hdrs)
start_response("200 OK", [hdr for hdr in hdrs.items()])
# Loop
first_event = True
while True:
# Wait for event on channel
msg = pubsub.get_message(timeout=settings.RT_SSE_HEARTBEAT if settings.RT_SSE_HEARTBEAT else (10 * 60.0))
if msg:
if msg["type"] == "message":
# Deserialize ResourceEvent
event_json = msg["data"].decode("utf-8")
event = ResourceEvent.from_json(event_json)
# Create SSE event
sse_evt = SseEvent.from_resource_event(event)
# Send 'retry' field on first SSE event delivered
if first_event:
sse_evt.retry = settings.RT_SSE_RETRY
first_event = False
# Send SSE event to client
yield sse_evt.as_utf8()
else:
# Timeout, send SSE heartbeat if necessary
if settings.RT_SSE_HEARTBEAT:
yield SseHeartbeat().as_utf8()
def handle_sse(self, request):
res_path = request.match_info.get('resource')
res_path = '/' + res_path
# Append slash to resource path if URL ends with slash
suffix = request.match_info.get('suffix')
if suffix.endswith('/'):
res_path += '/'
redis_conn = None
redis_subscription = None
sub_id = None
try:
# Check route is a Django-RT resource
try:
logger.debug('Verifying %s is an RT resource' % (res_path, ))
verify_resource_view(res_path)
except NotAnRtResourceError:
logger.debug('Not an RT resource; aborting')
return web.Response(status=406)
except ResourceError as e:
logger.debug('Caught ResourceError; aborting')
return web.Response(status=e.status)
# Connect to Redis server
redis_conn = yield from asyncio_redis.Connection.create(
host=settings.RT_REDIS_HOST,
port=settings.RT_REDIS_PORT,
db=settings.RT_REDIS_DB,
password=settings.RT_REDIS_PASSWORD)
# Create subscription
while True:
sub_id = generate_subscription_id()
result = yield from redis_conn.setnx(
get_subscription_key(sub_id), 'requested')
if result:
break
logger.debug('Created subscription ID: %s' % (sub_id, ))
# Request resource from Django API
try:
logger.debug('Requesting subscription for %s' % (res_path, ))
res = yield from self.request_resource(res_path, request,
sub_id)
except NotAnRtResourceError:
logger.debug(
"Subscription denied: not an rt resource. This shouldn't happen..."
)
return web.Response(status=406)
except ResourceError as e:
logger.debug('Subscription denied: HTTP error %d' %
(e.status, ))
return web.Response(status=e.status)
# Check subscription status and change to 'subscribed'
sub_key = get_subscription_key(sub_id)
sub_status = yield from redis_conn.get(sub_key)
assert sub_status == 'granted'
logger.debug('Subscription granted')
result = yield from redis_conn.set(sub_key, 'subscribed')
if result:
logger.debug('Subscription %s status changed to "subscribed"' %
(sub_id, ))
# Delete subscription key (not currently used for anything else)
yield from redis_conn.delete([sub_key])
# Subscribe to Redis channel
chan = get_full_channel_name(res.channel)
logger.debug('Subscribing to Redis channel %s' % (chan, ))
redis_subscription = yield from redis_conn.start_subscribe()
yield from redis_subscription.subscribe([chan])
# Prepare response
response = web.StreamResponse()
response.content_type = 'text/event-stream'
cors_hdrs = get_cors_headers(request.headers.get('Origin', None))
response.headers.update(cors_hdrs)
yield from response.prepare(request)
# Loop
first_event = True
while True:
# Wait for event on channel
try:
reply = yield from asyncio.wait_for(
redis_subscription.next_published(),
settings.RT_SSE_HEARTBEAT)
except asyncio.TimeoutError:
# Timeout, send SSE heartbeat
response.write(SseHeartbeat().as_utf8())
yield from response.drain()
else:
# Deserialize ResourceEvent
event = ResourceEvent.from_json(reply.value)
# Create SSE event
sse_evt = SseEvent.from_resource_event(event)
# Send 'retry' field on first SSE event delivered
if first_event:
sse_evt.retry = settings.RT_SSE_RETRY
first_event = False
# Send SSE event to client
response.write(sse_evt.as_utf8())
yield from response.drain()
yield from response.write_eof()
return response
finally:
# Cleanup
asyncio. async (self.cleanup_request(sub_id, redis_conn,
redis_subscription))