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grpc_pool.go
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grpc_pool.go
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// Copyright 2021 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package kv
import (
"context"
"google.golang.org/grpc"
)
type sharedConn struct {
*grpc.ClientConn
active int64
}
// GrpcPool defines an interface that can serve as a gPRC connection pool.
// It provides API to get a shared connection from pool and API to decrease usage
// reference of the shared connection
type GrpcPool interface {
// GetConn returns an available gRPC ClientConn
GetConn(target string) (*sharedConn, error)
// ReleaseConn is called when a gRPC stream is released
ReleaseConn(sc *sharedConn, target string)
// RecycleConn recycles idle connections periodically
RecycleConn(ctx context.Context)
// Close tears down all ClientConns maintained in pool
Close()
}