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