python實(shí)現(xiàn)web服務(wù)器

3fuyu 發(fā)布于2019-07-24 18:27 / 2984人閱讀

摘要：剛好看了一下，就想著用實(shí)現(xiàn)一下服務(wù)器的過程。創(chuàng)建，監(jiān)聽端口可以自設(shè)解析協(xié)議中的獲取你想要的參數(shù)通過獲取的參數(shù)取服務(wù)器上找到相應(yīng)的靜態(tài)資源這里只說靜態(tài)資源，動(dòng)態(tài)的下一篇再說組織協(xié)議的通過端口返回給客服端

本想寫一篇關(guān)于http->nginx->php這個(gè)過程中數(shù)據(jù)是怎么傳輸?shù)奈恼拢肓税胩欤瑢?shí)在沒有心情去寫。剛好看了一下python，就想著用python實(shí)現(xiàn)一下web服務(wù)器的過程。這個(gè)很簡(jiǎn)單，目前只支持靜態(tài)文件的加載，動(dòng)態(tài)語言就要接入fastcgi了(目前還在看fastcgi，下一版本更新吧)。以前沒寫過python也是邊寫邊查，好多東西用的不是特別好，還有，可以在這個(gè)基礎(chǔ)上改動(dòng)，可以支持access.log，多server配置。這里就不寫了。

其實(shí)過程很簡(jiǎn)單，nginx大體也是這個(gè)邏輯（但是，nginx內(nèi)部就復(fù)雜多了）。

創(chuàng)建socket，監(jiān)聽80端口（可以自設(shè)）

解析http協(xié)議中的request（獲取你想要的參數(shù)）

通過獲取的參數(shù)取服務(wù)器上找到相應(yīng)的靜態(tài)資源（這里只說靜態(tài)資源，動(dòng)態(tài)的下一篇再說）

組織http協(xié)議的response

通過80端口返回給客服端

#/usr/bin/python
import socket
import sys
import os
from thread import *

HOST = "";PORT = 8887

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print "Socket created"

try:
    s.bind((HOST, PORT))
except socket.error , msg:
    print "Bind failed. Error Code : " + str(msg[0]) + " Message " + msg[1]
    sys.exit()

print "Socket bind complete"

s.listen(10)

print "Socket now listening"

def assces_log(request):
    fp = open("http.log", "aw")
    fp.write(request+"
")
    fp.close()

def parse_request(request):
    request = request.splitlines()
    line = request[0]
    line = line.split();
    dict_request = {"method":line[0], "path":line[1], "version":line[2]}
    return dict_request

while True:
    conn, addr = s.accept()
    request = conn.recv(1024)
    print request
    print "
"

    dist_request = parse_request(request)
    path = dist_request["path"]
    path = os.getcwd() + path

    if os.path.isfile(path):
        if os.path.exists(path):
            fp = open(path, "r")
            reply = fp.read()
            fp.close()
            response_errno = 200
            response_msg = "OK"
        else:
            reply = "Not found page"
            response_errno = 404
            response_msg = "Not found"
    else:
        reply = "Forbidden"
        response_errno = 403
        response_msg = "Forbidden"

    response = "HTTP/1.1 " + str(response_errno) + " " + response_msg + "
"
    response += "
"
    response += reply
    print response

    assces_log(request)

    conn.sendall(response)
    conn.close()

s.close()