wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
handled by parent
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
handle by child
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
handled by parent
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
handled by parent
测试结果是每次对于客户端的连接，有可能父进程处理也有可能被子进程处理。现在我们尝试仅提供http服务，并且为了让父进程更加轻量，仅让父进程传递句柄给子进程而不做请求处理:
main.js
var cp = require('child_process'); var child1 = cp.fork('./child.js'); var child2 = cp.fork('./child.js'); var child3 = cp.fork('./child.js'); var child4 = cp.fork('./child.js'); var server = require('net').createServer(); //父进程将接收到的请求分发给子进程 server.listen(8080,function(){ child1.send('server',server); child2.send('server',server); child3.send('server',server); child4.send('server',server); //发送完句柄后关闭监听 server.close(); });
child.js
var http = require('http'); var serverInChild = http.createServer(function(req,res){ res.end('I am child.Id:'+process.pid); }); //子进程收到父进程传递的句柄(即客户端与服务器的socket连接对象) process.on('message',function(m,serverInParent){ if(m==='server'){ //处理与客户端的连接 serverInParent.on('connection',function(socket){ //交给http服务来处理 serverInChild.emit('connection',socket); }); } });
当运行上述代码，此时查看8080端口占有会有如下结果:
wang@wang ~/code/nodeStudy $ lsof -i:8080
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
node 5120 wang 11u IPv6 44561 0t0 TCP *:http-alt (LISTEN)
node 5126 wang 11u IPv6 44561 0t0 TCP *:http-alt (LISTEN)
node 5127 wang 11u IPv6 44561 0t0 TCP *:http-alt (LISTEN)
node 5133 wang 11u IPv6 44561 0t0 TCP *:http-alt (LISTEN)
运行curl查看结果:
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
I am child.Id:5127
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
I am child.Id:5133
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
I am child.Id:5120
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
I am child.Id:5126
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
I am child.Id:5133
wang@wang ~/code/nodeStudy $ curl 192.168.10.104:8080
I am child.Id:5126