micro/client/rpc_pool.go

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package client
import (
"sync"
"github.com/micro/go-micro/transport"
)
type pool struct {
tr transport.Transport
sync.Mutex
conns map[string][]*poolConn
}
type poolConn struct {
transport.Client
}
var (
maxIdleConn = 2
)
func newPool() *pool {
return &pool{
conns: make(map[string][]*poolConn),
}
}
// NoOp the Close since we manage it
func (p *poolConn) Close() error {
return nil
}
func (p *pool) getConn(addr string, tr transport.Transport, opts ...transport.DialOption) (*poolConn, error) {
p.Lock()
conns, ok := p.conns[addr]
// no free conn
if !ok || len(conns) == 0 {
p.Unlock()
// create new conn
c, err := tr.Dial(addr, opts...)
if err != nil {
return nil, err
}
return &poolConn{c}, nil
}
conn := conns[len(conns)-1]
p.conns[addr] = conns[:len(conns)-1]
p.Unlock()
return conn, nil
}
func (p *pool) release(addr string, conn *poolConn, err error) {
// don't store the conn
if err != nil {
conn.Client.Close()
return
}
// otherwise put it back
p.Lock()
conns := p.conns[addr]
if len(conns) >= maxIdleConn {
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p.Unlock()
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conn.Client.Close()
return
}
p.conns[addr] = append(conns, conn)
p.Unlock()
}