tidb conn 源码
tidb conn 代码
文件路径：/br/pkg/lightning/common/conn.go
// 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,
// 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 common
import (
"context"
"sync"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/br/pkg/lightning/log"
"go.uber.org/zap"
"google.golang.org/grpc"
)
// ConnPool is a lazy pool of gRPC channels.
// When `Get` called, it lazily allocates new connection if connection not full.
// If it's full, then it will return allocated channels round-robin.
type ConnPool struct {
mu sync.Mutex
conns []*grpc.ClientConn
next int
cap int
newConn func(ctx context.Context) (*grpc.ClientConn, error)
logger log.Logger
}
func (p *ConnPool) TakeConns() (conns []*grpc.ClientConn) {
p.mu.Lock()
defer p.mu.Unlock()
p.conns, conns = nil, p.conns
p.next = 0
return conns
}
// Close closes the conn pool.
func (p *ConnPool) Close() {
for _, c := range p.TakeConns() {
if err := c.Close(); err != nil {
p.logger.Warn("failed to close clientConn", zap.String("target", c.Target()), log.ShortError(err))
}
}
}
// get tries to get an existing connection from the pool, or make a new one if the pool not full.
func (p *ConnPool) get(ctx context.Context) (*grpc.ClientConn, error) {
p.mu.Lock()
defer p.mu.Unlock()
if len(p.conns) < p.cap {
c, err := p.newConn(ctx)
if err != nil {
return nil, errors.Trace(err)
}
p.conns = append(p.conns, c)
return c, nil
}
conn := p.conns[p.next]
p.next = (p.next + 1) % p.cap
return conn, nil
}
// NewConnPool creates a new connPool by the specified conn factory function and capacity.
func NewConnPool(capacity int, newConn func(ctx context.Context) (*grpc.ClientConn, error), logger log.Logger) *ConnPool {
return &ConnPool{
cap: capacity,
conns: make([]*grpc.ClientConn, 0, capacity),
newConn: newConn,
logger: logger,
}
}
type GRPCConns struct {
mu sync.Mutex
conns map[uint64]*ConnPool
}
func (conns *GRPCConns) Close() {
conns.mu.Lock()
defer conns.mu.Unlock()
for _, cp := range conns.conns {
cp.Close()
}
}
func (conns *GRPCConns) GetGrpcConn(ctx context.Context, storeID uint64, tcpConcurrency int, newConn func(ctx context.Context) (*grpc.ClientConn, error)) (*grpc.ClientConn, error) {
conns.mu.Lock()
defer conns.mu.Unlock()
if _, ok := conns.conns[storeID]; !ok {
conns.conns[storeID] = NewConnPool(tcpConcurrency, newConn, log.FromContext(ctx))
}
return conns.conns[storeID].get(ctx)
}
func NewGRPCConns() *GRPCConns {
conns := &GRPCConns{conns: make(map[uint64]*ConnPool)}
return conns
}
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