Expose ConnectivityState of a ClientConn. #1385
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dfawley
reviewed
Jul 21, 2017
clientconn.go
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| } | ||
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| // connectivityStateEvaluator gets updated by addrConns when their | ||
| // stats transition, based on which it evaluates the state of |
clientconn.go
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| // connectivityStateEvaluator gets updated by addrConns when their | ||
| // stats transition, based on which it evaluates the state of | ||
| // ClientConn. | ||
| // Note: This code will eventully sit in the blanacer in the new design. |
clientconn.go
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| // before any addrConn is created ClientConn is in idle state. In the end when ClientConn | ||
| // closes it is in Shutdown state. | ||
| // TODO Note that in later releases, a ClientConn with no activity will be put into an Idle state. | ||
| func (csEvltr *connectivityStateEvaluator) recordTransition(oldState, newState ConnectivityState) { |
clientconn.go
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| ac.down(downErrorf(false, true, "%v", errNetworkIO)) | ||
| ac.down = nil | ||
| } | ||
| oldState := ac.state |
There was a problem hiding this comment.
How about this:
updateState := func(new ConnectivityState) {
ac.csEvltr.recordTransition(ac.state, new)
ac.state = new
}
....
updateState(Connecting)
...
updateState(TransientFailure)
...| defer cc.Close() | ||
| wantState := Ready | ||
| if state, ok := assertState(wantState, cc); !ok { | ||
| t.Fatalf("asserState(%s) = %s, false, want %s, true", wantState, state, wantState) |
dzbarsky
reviewed
Jul 22, 2017
clientconn.go
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| // connectivityStateEvaluator gets updated by addrConns when their | ||
| // states transition, based on which it evaluates the state of | ||
| // ClientConn. | ||
| // Note: This code will eventually sit in the blanacer in the new design. |
clientconn.go
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| // recordTransition records state change happening in every addrConn and based on | ||
| // that it evaluates what state the ClientConn is in. | ||
| // It can only transition between Ready, Connecting and TransientFailure. Other states, | ||
| // Idle and Shutdown are transitioned into by ClientConn; in the begining of the conneciton |
There was a problem hiding this comment.
nit: begining, conneciton
| } | ||
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| // updateState updates the ConnectivityState of ClientConn. | ||
| // If there's a change it notifies goroutines waiting on state change to |
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it can only notify 1 goroutine, right?
There was a problem hiding this comment.
Although rare, but it's possible multiple goroutines can make a call to WaitForStateChange
clientconn.go
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| err = cc.resetAddrConn(a, false, nil) | ||
| } | ||
| if err != nil { | ||
| grpclog.Warningf("Error creating conneciton to %v. Err: %v", a, err) |
dfawley
approved these changes
Jul 24, 2017
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fixes #1208
#1359