Commit Graph

21 Commits

Author SHA1 Message Date
Daniel Nephin 40cb72fe06 agent/grpc: add connection count metrics
Gauge metrics are great for understanding the current state, but can somtimes hide problems
if there are many disconnect/reconnects.

This commit adds counter metrics for connections and streams to make it easier to see the
count of newly created connections and streams.
2020-10-27 16:49:49 -04:00
Daniel Nephin 64284ed91a agent/grpc: rename metrics
These new names should make it easier to add counter metics with similar prefixes
2020-10-27 16:49:49 -04:00
Daniel Nephin 6e34759442 agent/grpc: Add an integration test for ClientPool with TLS
Also deregister the resolver.Builder in tests.
2020-10-27 16:34:18 -04:00
Daniel Nephin 87793cd090 agent/grpc: pass metrics to constructor
Instead of referencing a package var. This does not fix the flaky test, but it seems more correct.
2020-10-27 16:34:17 -04:00
Daniel Nephin 70fea7a77e agent/grpc: fix a flaky test by performing more retries
Instead of using retry.Run, which appears to have problems in some cases where it does not
emit an error message, use a for loop.

Increase the number of attempts and remove any sleep, since this operation is not that expensive to do
in a tight loop
2020-10-27 16:34:17 -04:00
Daniel Nephin 9b89fb492d agent/grpc: remove misleading warnings from test output
Handle shutdown properly in tests so that the tests don't warn about using a closed connection.
2020-10-27 16:34:16 -04:00
Daniel Nephin 64105079d9 agent/grpc: fix a flake in TestHandler_EmitsStats 2020-10-27 16:34:16 -04:00
Daniel Nephin 7e338693a8 agent/grpc: use a separate channel for closing the Accept
Closing l.conns can lead to a race and a 'panic: send on closed chan' when a
connection is in the middle of being handled when the server is shutting down.

Found using '-race -count=800'
2020-10-27 16:34:15 -04:00
Daniel Nephin e640d47319 agent/grpc/resolver: namespace the server ID with the DC name
So that if two datacenters end up with overlapping serverIDs we don't send requests to the wrong server
2020-10-27 16:34:15 -04:00
Daniel Nephin 022744699f grpc: fix data rate in stats handler test 2020-10-08 19:43:49 -04:00
Daniel Nephin 371ec2d70a subscribe: add a stateless subscribe service for the gRPC server
With a Backend that provides access to the necessary dependencies.
2020-10-06 12:49:35 -04:00
Daniel Nephin c89eb4ff20 agent/grpc: always close the conn when dialing fails. 2020-09-24 12:53:14 -04:00
Daniel Nephin 87f0eb6790 agent/grpc: seed the rand for shuffling servers 2020-09-24 12:53:14 -04:00
Daniel Nephin ff3610850e agent/grpc: use router.Manager to handle the rebalance
The router.Manager is already rebalancing servers for other connection pools, so it can call into our resolver to do the same.
This change allows us to remove the serf dependency from resolverBuilder, and remove Datacenter from the config.

Also revert the change to refreshServerRebalanceTimer
2020-09-24 12:53:14 -04:00
Daniel Nephin 5e7b9bffdb grpc: restore integration tests for grpc client conn pool
Add a fake rpc Listener
2020-09-24 12:53:14 -04:00
Daniel Nephin 4b041a018d grpc: redeuce dependencies, unexport, and add godoc
Rename GRPCClient to ClientConnPool. This type appears to be more of a
conn pool than a client. The clients receive the connections from this
pool.

Reduce some dependencies by adjusting the interface baoundaries.

Remove the need to create a second slice of Servers, just to pick one and throw the rest away.

Unexport serverResolver, it is not used outside the package.

Use a RWMutex for ServerResolverBuilder, some locking is read-only.

Add more godoc.
2020-09-24 12:53:10 -04:00
Daniel Nephin 4b24470887 grpc: move client conn pool to grpc package 2020-09-24 12:48:12 -04:00
Daniel Nephin 1e40f00567 agent/grpc: make TestHandler_EmitsStats predictable
Occasionally this test would flake. The flakes were fixed by:

1. Stopping the service and retrying to check on metrics. This way we
   also include the active_streams going to 0 in the metric calls.

2. Using a reference to the global Metrics. This way when other tests
   have background goroutines that are still shutting down, they won't
   emit metrics to the metric instance with the fake Sink. The stats
   test can patch the local reference to the global, so the existing
   statHandlers will continue to emit to the global, but the stats
   test will send all metrics to the replacement.
2020-09-14 19:05:22 -04:00
Daniel Nephin c827e7f1e9 grpc: add Datacenter field to testing service response 2020-09-14 19:02:09 -04:00
Daniel Nephin 1a930fcf75 grpc: Add a simple test service for testing the gRPC server 2020-09-08 12:10:43 -04:00
Daniel Nephin 863a9df951 server: add gRPC server for streaming events
Includes a stats handler and stream interceptor for grpc metrics.

Co-authored-by: Paul Banks <banks@banksco.de>
2020-09-08 12:10:41 -04:00