mirror of https://github.com/dapr/go-sdk.git
53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package client
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import (
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"context"
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"errors"
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"time"
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"google.golang.org/grpc/connectivity"
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)
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// The following errors are returned from Wait.
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var (
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// A call to Wait timed out while waiting for a gRPC connection to reach a Ready state.
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errWaitTimedOut = errors.New("timed out waiting for client connectivity")
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)
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func (c *GRPCClient) Wait(ctx context.Context, timeout time.Duration) error {
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timeoutCtx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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// SDKs for other languages implement Wait by attempting to connect to a TCP endpoint
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// with a timeout. Go's SDKs handles more endpoints than just TCP ones. To simplify
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// the code here, we rely on GRPCs connectivity state management instead.
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// See https://github.com/grpc/grpc/blob/master/doc/connectivity-semantics-and-api.md
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for {
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curState := c.connection.GetState()
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if curState == connectivity.Ready {
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return nil
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}
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select {
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case <-timeoutCtx.Done():
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return errWaitTimedOut
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default:
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// Multiple state changes can happen: keep waiting for a successful one or time out
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c.connection.WaitForStateChange(timeoutCtx, curState)
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}
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}
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}
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