使用Erlang實現http server是否更有優勢？

01-21

謝邀。用Erlang當然方便了。隨手就給你寫一個出來。

-module(my_http_server).


-export([start/0, accept/1, handle_connection/1]).
start() -&>

    {ok, Socket} = gen_tcp:listen(8080, [binary, {packet, http}, {active, false}, {reuseaddr, true}]),

    Pid = spawn(?MODULE, accept, [Socket]),

    ok = gen_tcp:controlling_process(Socket, Pid),

    ok.
accept(Socket) -&>

    {ok, Conn} = gen_tcp:accept(Socket),

    Pid = spawn(?MODULE, handle_connection, [Conn]),

    ok = gen_tcp:controlling_process(Conn, Pid),

    ?MODULE:accept(Socket).
handle_connection(Socket) -&>

    {ok, {http_request, Method, Path, Version}} = gen_tcp:recv(Socket, 0),

    Headers = recv_headers(Socket),

    ok = inet:setopts(Socket, [{packet, raw}]),

    handle_request(Socket, Method, Path, Version, Headers).
recv_headers(Socket) -&>

    case gen_tcp:recv(Socket, 0) of

        {ok, {http_header, _, Field, _, Value}} -&>

            [{Field, Value}|recv_headers(Socket)];

        {ok, http_eoh} -&>

            []

    end.

handle_request(Socket, "GET", {abs_path, "/"}, {1,1}, _) -&> ok = gen_tcp:send( Socket, [&<&<"HTTP/1.1 200 OK "&>&>, &<&<"Connection: close "&>&>, &<&<"Content-Type: text-plain "&>&>, &<&<" "&>&>, &<&<"OK "&>&>]), ok = gen_tcp:close(Socket).

不服你可以用C++寫一個啊

顯然不是么，你看Python的版本：

python -m SimpleHTTPServer 8080

如果可以用庫C++也沒多麻煩，比如用我的Fiberized.IO

#include & #include &


using namespace fibio::http;

int fibio::main(int argc, char *argv[]) { fibio::this_fiber::get_scheduler().add_worker_thread(3); return server(8080).handler( route( path_("/add/:x/:y")&>&>[](int x, int y){return x+y;} ) ).run().value(); }

哪個不比 @bhuztez 的那個Erlang版本短多了，而且單線程也能飈個幾萬qps的……

沒必要再用erlang寫http server了，用mochiweb或者cowboy，都很棒。但erlang本身適不適合用來寫http server不太好評判

可以熱更新

package main


import "net/http"

func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Write([]byte("OK")) }) http.ListenAndServe(":8081", nil) }