NucliaDB Telemetry
Open telemetry compatible plugin to propagate traceid on FastAPI, Nats and GRPC with Asyncio.
ENV vars:
JAEGER_ENABLED = True
JAEGER_HOST = "127.0.0.1"
JAEGER_PORT = server.port
On FastAPI you should add:
tracer_provider = get_telemetry("HTTP_SERVICE")
app = FastAPI(title="Test API") # type: ignore
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
FastAPIInstrumentor.instrument_app(app, tracer_provider=tracer_provider)
..
await init_telemetry(tracer_provider) # To start asyncio task
..
On GRPC Server you should add:
tracer_provider = get_telemetry("GRPC_SERVER_SERVICE")
telemetry_grpc = GRPCTelemetry("GRPC_CLIENT_SERVICE", tracer_provider)
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
server = telemetry_grpc.init_server()
helloworld_pb2_grpc.add_GreeterServicer_to_server(SERVICER, server)
..
await init_telemetry(tracer_provider) # To start asyncio task
..
On GRPC Client you should add:
tracer_provider = get_telemetry("GRPC_CLIENT_SERVICE")
telemetry_grpc = GRPCTelemetry("GRPC_CLIENT_SERVICE", tracer_provider)
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
channel = telemetry_grpc.init_client(f"localhost:{grpc_service}")
stub = helloworld_pb2_grpc.GreeterStub(channel)
..
await init_telemetry(tracer_provider) # To start asyncio task
..
On Nats jetstream push subscriber you should add:
nc = await nats.connect(servers=[self.natsd])
js = self.nc.jetstream()
tracer_provider = get_telemetry("NATS_SERVICE")
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
jsotel = JetStreamContextTelemetry(
js, "NATS_SERVICE", tracer_provider
)
subscription = await jsotel.subscribe(
subject="testing.telemetry",
stream="testing",
cb=handler,
)
On Nats publisher you should add:
nc = await nats.connect(servers=[self.natsd])
js = self.nc.jetstream()
tracer_provider = get_telemetry("NATS_SERVICE")
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
jsotel = JetStreamContextTelemetry(
js, "NATS_SERVICE", tracer_provider
)
await jsotel.publish("testing.telemetry", request.name.encode())
On Nats jetstream pull subscription you can use different patterns if you want to just get one message and exit or pull several ones. For just one message
nc = await nats.connect(servers=[self.natsd])
js = self.nc.jetstream()
tracer_provider = get_telemetry("NATS_SERVICE")
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
jsotel = JetStreamContextTelemetry(
js, "NATS_SERVICE", tracer_provider
)
# You can use either pull_subscribe or pull_subscribe_bind
subscription = await jsotel.pull_subscribe(
subject="testing.telemetry",
durable="consumer_name"
stream="testing",
)
async def callback(message):
# Do something with your message
# and optionally return something
return True
try:
result = await jsotel.pull_one(subscription, callback)
except errors.TimeoutError
pass
For multiple messages just wrap it in a loop:
while True:
try:
result = await jsotel.pull_one(subscription, callback)
except errors.TimeoutError
pass
On Nats client (NO Jestream! ) publisher you should add:
nc = await nats.connect(servers=[self.natsd])
js = self.nc.jetstream()
tracer_provider = get_telemetry("NATS_SERVICE")
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
ncotel = NatsClientTelemetry(
nc, "NATS_SERVICE", tracer_provider
)
await ncotel.publish("testing.telemetry", request.name.encode())
On Nats client (NO Jestream! ) subscriber you should add:
nc = await nats.connect(servers=[self.natsd])
js = self.nc.jetstream()
tracer_provider = get_telemetry("NATS_SERVICE")
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
ncotel = NatsClientContextTelemetry(
js, "NATS_SERVICE", tracer_provider
)
subscription = await ncotel.subscribe(
subject="testing.telemetry",
queue="queue_nname",
cb=handler,
)
On Nats client (NO Jestream! ) request you should add:
nc = await nats.connect(servers=[self.natsd])
js = self.nc.jetstream()
tracer_provider = get_telemetry("NATS_SERVICE")
if not tracer_provider.initialized:
await init_telemetry(tracer_provider)
set_global_textmap(B3MultiFormat())
ncotel = NatsClientTelemetry(
nc, "NATS_SERVICE", tracer_provider
)
response = await ncotel.request("testing.telemetry", request.name.encode())
And to handle responses on the other side, you can use the same pattern as in plain Nats client
subscriber, just adding the msg.respond() on the handler when done
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