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rpc.go
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rpc.go
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// Copyright 2015 Liu Dong <ddliuhb@gmail.com>.
// Licensed under the MIT license.
package spider
import (
"net"
"net/rpc"
"time"
"runtime"
)
type SpiderInfo struct {
StartTime time.Time
MemoryUsage uint64
Stats map[Status]uint64
IsStopped bool
IsPaused bool
}
func StartRPCServer(spider *Spider, listen string) error {
rpc.Register(NewRPC(spider))
l, e := net.Listen("tcp", listen)
if e != nil {
return e
}
rpc.Accept(l)
return nil
}
func NewRPC(spider *Spider) *RPC {
return &RPC{
spider,
time.Now(),
}
}
type RPC struct {
spider *Spider
startTime time.Time
}
func (rpc *RPC) Pong(skip bool, message *string) error {
*message = "pong"
return nil
}
func (rpc *RPC) Pause(skip bool, ack *bool) error {
rpc.spider.Pause()
return nil
}
func (rpc *RPC) Resume(skip bool, ack *bool) error {
rpc.spider.Resume()
return nil
}
func (rpc *RPC) Stop(skip bool, ack *bool) error {
rpc.spider.Stop()
return nil
}
func (rpc *RPC) Add(uriList []string, ack *bool) error {
rpc.spider.AddUri(uriList...)
return nil
}
func (rpc *RPC) Info(skip bool, info *SpiderInfo) error {
var memStats runtime.MemStats
runtime.ReadMemStats(&memStats)
*info = SpiderInfo {
StartTime: rpc.startTime,
MemoryUsage: memStats.Alloc,
Stats: rpc.spider.Stats,
IsStopped: rpc.spider.IsStopped,
IsPaused: rpc.spider.IsPaused,
}
return nil
}
func NewRPCClient(dsn string, timeout time.Duration) (*RPCClient, error) {
connection, err := net.DialTimeout("tcp", dsn, timeout)
if err != nil {
return nil, err
}
return &RPCClient{connection: rpc.NewClient(connection)}, nil
}
type RPCClient struct {
connection *rpc.Client
}
func (client *RPCClient) Ping() error {
var message string
err := client.connection.Call("RPC.Pong", true, &message)
if err == nil {
println(message)
}
return err
}
func (client *RPCClient) Pause() error {
var ack bool
return client.connection.Call("RPC.Pause", true, &ack)
}
func (client *RPCClient) Resume() error {
var ack bool
return client.connection.Call("RPC.Resume", true, &ack)
}
func (client *RPCClient) Stop() error {
var ack bool
return client.connection.Call("RPC.Stop", true, &ack)
}
func (client *RPCClient) Add(uriList ...string) error {
var ack bool
return client.connection.Call("RPC.Add", uriList, &ack)
}
func (client *RPCClient) Info() (SpiderInfo, error) {
var info SpiderInfo
err := client.connection.Call("RPC.Info", true, &info)
return info, err
}