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connection_pool.go
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connection_pool.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 internal
import (
"fmt"
"net/url"
"sync"
"sync/atomic"
"time"
"github.com/apache/pulsar-client-go/pulsar/internal/auth"
"github.com/apache/pulsar-client-go/pulsar/log"
)
// ConnectionPool is a interface of connection pool.
type ConnectionPool interface {
// GetConnection get a connection from ConnectionPool.
GetConnection(logicalAddr *url.URL, physicalAddr *url.URL) (Connection, error)
// Close all the connections in the pool
Close()
}
type connectionPool struct {
sync.Mutex
connections map[string]*connection
connectionTimeout time.Duration
tlsOptions *TLSOptions
auth auth.Provider
maxConnectionsPerHost int32
roundRobinCnt int32
keepAliveInterval time.Duration
metrics *Metrics
log log.Logger
}
// NewConnectionPool init connection pool.
func NewConnectionPool(
tlsOptions *TLSOptions,
auth auth.Provider,
connectionTimeout time.Duration,
keepAliveInterval time.Duration,
maxConnectionsPerHost int,
logger log.Logger,
metrics *Metrics) ConnectionPool {
return &connectionPool{
connections: make(map[string]*connection),
tlsOptions: tlsOptions,
auth: auth,
connectionTimeout: connectionTimeout,
maxConnectionsPerHost: int32(maxConnectionsPerHost),
keepAliveInterval: keepAliveInterval,
log: logger,
metrics: metrics,
}
}
func (p *connectionPool) GetConnection(logicalAddr *url.URL, physicalAddr *url.URL) (Connection, error) {
key := p.getMapKey(logicalAddr)
p.Lock()
conn, ok := p.connections[key]
if ok {
p.log.Debugf("Found connection in pool key=%s logical_addr=%+v physical_addr=%+v",
key, conn.logicalAddr, conn.physicalAddr)
// When the current connection is in a closed state or the broker actively notifies that the
// current connection is closed, we need to remove the connection object from the current
// connection pool and create a new connection.
if conn.closed() {
p.log.Debugf("Removed connection from pool key=%s logical_addr=%+v physical_addr=%+v",
key, conn.logicalAddr, conn.physicalAddr)
delete(p.connections, key)
conn.Close()
conn = nil // set to nil so we create a new one
}
}
if conn == nil {
conn = newConnection(connectionOptions{
logicalAddr: logicalAddr,
physicalAddr: physicalAddr,
tls: p.tlsOptions,
connectionTimeout: p.connectionTimeout,
auth: p.auth,
keepAliveInterval: p.keepAliveInterval,
logger: p.log,
metrics: p.metrics,
})
p.connections[key] = conn
p.Unlock()
conn.start()
} else {
// we already have a connection
p.Unlock()
}
err := conn.waitUntilReady()
return conn, err
}
func (p *connectionPool) Close() {
p.Lock()
for k, c := range p.connections {
delete(p.connections, k)
c.Close()
}
p.Unlock()
}
func (p *connectionPool) getMapKey(addr *url.URL) string {
cnt := atomic.AddInt32(&p.roundRobinCnt, 1)
if cnt < 0 {
cnt = -cnt
}
idx := cnt % p.maxConnectionsPerHost
return fmt.Sprint(addr.Host, '-', idx)
}