74 lines
2.1 KiB
Go
74 lines
2.1 KiB
Go
|
/*
|
||
|
|
*
|
||
|
|
* Copyright 2017 gRPC authors.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
// Package connectivity defines connectivity semantics.
|
||
|
|
// For details, see https://github.com/grpc/grpc/blob/master/doc/connectivity-semantics-and-api.md.
|
||
|
|
// All APIs in this package are experimental.
|
||
|
|
package connectivity
|
||
|
|
|
||
|
|
import (
|
||
|
|
"context"
|
||
|
|
|
||
|
|
"google.golang.org/grpc/grpclog"
|
||
|
|
)
|
||
|
|
|
||
|
|
// State indicates the state of connectivity.
|
||
|
|
// It can be the state of a ClientConn or SubConn.
|
||
|
|
type State int
|
||
|
|
|
||
|
|
func (s State) String() string {
|
||
|
|
switch s {
|
||
|
|
case Idle:
|
||
|
|
return "IDLE"
|
||
|
|
case Connecting:
|
||
|
|
return "CONNECTING"
|
||
|
|
case Ready:
|
||
|
|
return "READY"
|
||
|
|
case TransientFailure:
|
||
|
|
return "TRANSIENT_FAILURE"
|
||
|
|
case Shutdown:
|
||
|
|
return "SHUTDOWN"
|
||
|
|
default:
|
||
|
|
grpclog.Errorf("unknown connectivity state: %d", s)
|
||
|
|
return "Invalid-State"
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const (
|
||
|
|
// Idle indicates the ClientConn is idle.
|
||
|
|
Idle State = iota
|
||
|
|
// Connecting indicates the ClienConn is connecting.
|
||
|
|
Connecting
|
||
|
|
// Ready indicates the ClientConn is ready for work.
|
||
|
|
Ready
|
||
|
|
// TransientFailure indicates the ClientConn has seen a failure but expects to recover.
|
||
|
|
TransientFailure
|
||
|
|
// Shutdown indicates the ClientConn has started shutting down.
|
||
|
|
Shutdown
|
||
|
|
)
|
||
|
|
|
||
|
|
// Reporter reports the connectivity states.
|
||
|
|
type Reporter interface {
|
||
|
|
// CurrentState returns the current state of the reporter.
|
||
|
|
CurrentState() State
|
||
|
|
// WaitForStateChange blocks until the reporter's state is different from the given state,
|
||
|
|
// and returns true.
|
||
|
|
// It returns false if <-ctx.Done() can proceed (ctx got timeout or got canceled).
|
||
|
|
WaitForStateChange(context.Context, State) bool
|
||
|
|
}
|