align with grpc base/balancer to trigger reconnect in Idle state (whe…

…n we move to gRPC 1.41+) (#335)

* build(deps): bump github.com/prometheus/client_golang

Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.11.0 to 1.11.1.
- [Release notes](https://github.com/prometheus/client_golang/releases)
- [Changelog](https://github.com/prometheus/client_golang/blob/main/CHANGELOG.md)
- [Commits](prometheus/client_golang@v1.11.0...v1.11.1)

---
updated-dependencies:
- dependency-name: github.com/prometheus/client_golang
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* align with grpc base/balancer to trigger reconnect in Idle state

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

broker/protocol/dispatcher.go

@@ -117,12 +117,19 @@ func (d *dispatcher) UpdateSubConnState(sc balancer.SubConn, state balancer.SubC
 		panic("unexpected SubConn")
 	}
 
-	if state.ConnectivityState == connectivity.Connecting && d.connState[sc] == connectivity.TransientFailure {
+	if (state.ConnectivityState == connectivity.Connecting || state.ConnectivityState == connectivity.Idle) &&
+		d.connState[sc] == connectivity.TransientFailure {
 		// gRPC will quickly transition failed connections back into a Connecting
 		// state. In many cases, such as a remote-initiated close from a
 		// shutting-down server, the SubConn may never return. Until we see a
 		// successful re-connect, continue to consider the SubConn as broken
 		// (and trigger invalidations of cached Routes which use it).
+
+		if state.ConnectivityState == connectivity.Idle {
+			sc.Connect()
+		}
+		d.mu.Unlock()
+		return
 	} else {
 		d.connState[sc] = state.ConnectivityState
 	}
@@ -132,6 +139,10 @@ func (d *dispatcher) UpdateSubConnState(sc balancer.SubConn, state balancer.SubC
 		delete(d.connID, sc)
 		delete(d.connState, sc)
 	}
+
+	if state.ConnectivityState == connectivity.Idle {
+		sc.Connect()
+	}
 	d.mu.Unlock()
 
 	// Notify gRPC that block requests may now be able to proceed.

go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/mattn/go-sqlite3 v2.0.3+incompatible
 	github.com/olekukonko/tablewriter v0.0.5
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.11.0
+	github.com/prometheus/client_golang v1.11.1
 	github.com/prometheus/client_model v0.2.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/soheilhy/cmux v0.1.5

go.sum

@@ -342,8 +342,9 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
 github.com/prometheus/client_golang v1.7.1/go.mod h1:PY5Wy2awLA44sXw4AOSfFBetzPP4j5+D6mVACh+pe2M=
-github.com/prometheus/client_golang v1.11.0 h1:HNkLOAEQMIDv/K+04rukrLx6ch7msSRwf3/SASFAGtQ=
 github.com/prometheus/client_golang v1.11.0/go.mod h1:Z6t4BnS23TR94PD6BsDNk8yVqroYurpAkEiz0P2BEV0=
+github.com/prometheus/client_golang v1.11.1 h1:+4eQaD7vAZ6DsfsxB15hbE0odUjGI5ARs9yskGu1v4s=
+github.com/prometheus/client_golang v1.11.1/go.mod h1:Z6t4BnS23TR94PD6BsDNk8yVqroYurpAkEiz0P2BEV0=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=