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/*
*
* 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 ClientConn 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
}
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