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源码阅读笔记:webbench-1.5
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/* * (C) Radim Kolar 1997-2004 * This is free software, see GNU Public License version 2 for * details. * * Simple forking WWW Server benchmark: * * Usage: * webbench --help * * Return codes: * 0 - sucess * 1 - benchmark failed (server is not on-line) * 2 - bad param * 3 - internal error, fork failed * */ #include "socket.c" #include <unistd.h> #include <sys/param.h> #include <rpc/types.h> #include <getopt.h> #include <strings.h> #include <time.h> #include <signal.h> /* 超时标记,当被设置为 1 时,所有子进程退出 */ volatile int timerexpired=0; /* 成功请求数 */ int speed = 0; /* 失败请求数 */ int failed = 0; /* 读取字节总数 */ int bytes = 0; /* 把持的 HTTP 协议版本 */ int http10 = 1; /* 0 - http/0.9, 1 - http/1.0, 2 - http/1.1 */ /* 支持的 HTTP 方法 */ #define METHOD_GET 0 #define METHOD_HEAD 1 #define METHOD_OPTIONS 2 #define METHOD_TRACE 3 #define PROGRAM_VERSION "1.5" int method = METHOD_GET; /* 默认为GET方法 */ int clients = 1; /* 默认启动一个客户端(子进程) */ int force = 0; /* 是否等待响应数据返回,0 -等待,1 - 不等待 */ int force_reload = 0; /* 是否发送 Pragma: no-cache */ int proxyport = 80; /* 代理端口 */ char *proxyhost = NULL; /* 代理服务器名称 */ int benchtime = 30; /* 执行时间,当子进程执行时间到过这个秒数之后, 发送 SIGALRM 信号,将 timerexpired 设置为 1, 让所有子进程退出 */ /* 管道,子进程完成一次请求,则将写端写入数据,主进程从读端读取数据 */ int mypipe[2]; char host[MAXHOSTNAMELEN]; /* 主机名(64字节) */ #define REQUEST_SIZE 2048 char request[REQUEST_SIZE]; /* 请求字符串(HTTP头) */ /* 命令行的选项配置表,man getopt_long */ static const struct option long_options[] = { {"force", no_argument, &force, 1}, {"reload", no_argument, &force_reload, 1}, {"time", required_argument, NULL, ‘t‘}, {"help", no_argument, NULL, ‘?‘}, {"http09", no_argument, NULL, ‘9‘}, {"http10", no_argument, NULL, ‘1‘}, {"http11", no_argument, NULL, ‘2‘}, {"get", no_argument, &method, METHOD_GET}, {"head", no_argument, &method, METHOD_HEAD}, {"options", no_argument, &method, METHOD_OPTIONS}, {"trace", no_argument, &method, METHOD_TRACE}, {"version", no_argument, NULL, ‘V‘}, {"proxy", required_argument, NULL, ‘p‘}, {"clients", required_argument, NULL, ‘c‘}, {NULL, 0, NULL, 0} }; /* 子进程执行请求任务的函数 */ static void benchcore(const char* host,const int port, const char *request); /* 执行压测的主要入口函数 */ static int bench(void); /* 生成 HTTP 头 */ static void build_request(const char *url); /* 将 timerexpired 设置为1,让所有子进程退出 */ static void alarm_handler(int signal) { timerexpired=1; } /* 打印帮助 */ static void usage(void) { fprintf(stderr, "webbench [option]... URL\n" " -f|--force Don‘t wait for reply from server.\n" " -r|--reload Send reload request - Pragma: no-cache.\n" " -t|--time <sec> Run benchmark for <sec> seconds. Default 30.\n" " -p|--proxy <server:port> Use proxy server for request.\n" " -c|--clients <n> Run <n> HTTP clients at once. Default one.\n" " -9|--http09 Use HTTP/0.9 style requests.\n" " -1|--http10 Use HTTP/1.0 protocol.\n" " -2|--http11 Use HTTP/1.1 protocol.\n" " --get Use GET request method.\n" " --head Use HEAD request method.\n" " --options Use OPTIONS request method.\n" " --trace Use TRACE request method.\n" " -?|-h|--help This information.\n" " -V|--version Display program version.\n" ); }; int main(int argc, char *argv[]) { int opt = 0; int options_index = 0; char *tmp = NULL; if (argc == 1) { usage(); return 2; } /* 参数解释,参见 man getopt_long */ while ((opt = getopt_long(argc, argv, "912Vfrt:p:c:?h", long_options, &options_index)) != EOF) { switch(opt) { case 0 : break; case ‘f‘: force = 1; break; case ‘r‘: force_reload = 1; break; case ‘9‘: http10 = 0; break; case ‘1‘: http10 = 1; break; case ‘2‘: http10 = 2; break; case ‘V‘: printf(PROGRAM_VERSION"\n"); exit(0); case ‘t‘: benchtime = atoi(optarg); break; case ‘p‘: /* proxy server parsing server:port */ tmp = strrchr(optarg, ‘:‘); proxyhost = optarg; if (tmp == NULL) { break; } if (tmp == optarg) { fprintf(stderr,"Error in option --proxy %s: Missing hostname.\n",optarg); return 2; } if (tmp == optarg + strlen(optarg) - 1) { fprintf(stderr,"Error in option --proxy %s Port number is missing.\n",optarg); return 2; } *tmp=‘\0‘; proxyport = atoi(tmp + 1); break; case ‘:‘: case ‘h‘: case ‘?‘: usage(); return 2; break; case ‘c‘: clients = atoi(optarg); break; } } if (optind == argc) { fprintf(stderr, "webbench: Missing URL!\n"); usage(); return 2; } if (clients == 0) { clients = 1; } if (benchtime == 0) { benchtime = 60; } /* Copyright */ fprintf(stderr, "Webbench - Simple Web Benchmark "PROGRAM_VERSION"\n" "Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.\n" ); build_request(argv[optind]); /* 最后一个非选项的参数,被视为URL */ /* print bench info */ printf("\nBenchmarking: "); switch(method) { case METHOD_GET: default: printf("GET"); break; case METHOD_OPTIONS: printf("OPTIONS"); break; case METHOD_HEAD: printf("HEAD"); break; case METHOD_TRACE: printf("TRACE"); break; } printf(" %s",argv[optind]); switch(http10) { case 0: printf(" (using HTTP/0.9)"); break; case 2: printf(" (using HTTP/1.1)"); break; } printf("\n"); if (clients == 1) { printf("1 client"); } else { printf("%d clients", clients); } printf(", running %d sec", benchtime); if (force) { printf(", early socket close"); } if (proxyhost != NULL) { printf(", via proxy server %s:%d", proxyhost, proxyport); } if (force_reload) { printf(", forcing reload"); } printf(".\n"); return bench(); } /* 生成 HTTP 头 */ void build_request (const char *url) { char tmp[10]; int i; bzero(host, MAXHOSTNAMELEN); bzero(request, REQUEST_SIZE); /* 协议适配 * */ if (force_reload && proxyhost != NULL && http10 < 1) { http10=1; } if (method == METHOD_HEAD && http10 < 1) { http10=1; } if (method == METHOD_OPTIONS && http10 < 2) { http10=2; } if (method == METHOD_TRACE && http10 < 2) { http10=2; } switch (method) { default: case METHOD_GET: strcpy(request, "GET"); break; case METHOD_HEAD: strcpy(request, "HEAD"); break; case METHOD_OPTIONS: strcpy(request, "OPTIONS"); break; case METHOD_TRACE: strcpy(request, "TRACE"); break; } strcat(request, " "); if (NULL == strstr(url, "://")) { fprintf(stderr, "\n%s: is not a valid URL.\n",url); exit(2); } if (strlen(url) > 1500) { fprintf(stderr,"URL is too long.\n"); exit(2); } if (proxyhost == NULL) { if (0 != strncasecmp("http://", url, 7)) { fprintf(stderr,"\nOnly HTTP protocol is directly supported, set --proxy for others.\n"); exit(2); } } /* protocol/host delimiter */ i = strstr(url, "://") - url + 3; /* printf("%d\n",i); */ if (strchr(url + i, ‘/‘) == NULL) { fprintf(stderr,"\nInvalid URL syntax - hostname don‘t ends with ‘/‘.\n"); exit(2); } if (proxyhost == NULL) { /* get port from hostname */ if (index(url + i, ‘:‘) != NULL && index(url + i, ‘:‘) < index(url + i, ‘/‘)) { strncpy(host, url + i, strchr(url + i, ‘:‘) - url - i); bzero(tmp, 10); strncpy(tmp, index(url + i, ‘:‘) + 1, strchr(url + i, ‘/‘) - index(url + i, ‘:‘) - 1); /* printf("tmp=%s\n",tmp); */ proxyport = atoi(tmp); if (proxyport == 0) { proxyport=80; } } else { strncpy(host, url + i, strcspn(url + i, "/")); } // printf("Host=%s\n",host); strcat(request + strlen(request), url + i + strcspn(url + i, "/")); } else { // printf("ProxyHost=%s\nProxyPort=%d\n",proxyhost,proxyport); strcat(request, url); } if (http10 == 1) { strcat(request, " HTTP/1.0"); } else if (http10 == 2) { strcat(request, " HTTP/1.1"); } strcat(request,"\r\n"); if (http10 > 0) { strcat(request, "User-Agent: WebBench "PROGRAM_VERSION"\r\n"); } if (proxyhost == NULL && http10 > 0) { strcat(request, "Host: "); strcat(request, host); strcat(request, "\r\n"); } if (force_reload && proxyhost != NULL) { strcat(request, "Pragma: no-cache\r\n"); } if (http10 > 1) { strcat(request, "Connection: close\r\n"); } /* add empty line at end */ if (http10 > 0) { strcat(request, "\r\n"); } // printf("Req=%s\n",request); } /* vraci system rc error kod */ static int bench(void) { int i, j, k; pid_t pid = 0; FILE *f; /* check avaibility of target server */ i = Socket(proxyhost == NULL ? host : proxyhost, proxyport); if (i < 0) { fprintf(stderr,"\nConnect to server failed. Aborting benchmark.\n"); return 1; } close(i); /* create pipe */ if (pipe(mypipe)) { perror("pipe failed."); return 3; } /* not needed, since we have alarm() in childrens */ /* wait 4 next system clock tick */ /* cas=time(NULL); while(time(NULL)==cas) sched_yield(); */ /* fork childs */ for (i = 0; i < clients; i++) { pid = fork(); if (pid <= (pid_t)0) { /* child process or error*/ sleep(1); /* make childs faster */ /* 这个 break 很重要,它主要让子进程只能从父进程生成,否则子进程会再生成子进程 */ break; } } if (pid < (pid_t)0) { fprintf(stderr,"problems forking worker no. %d\n",i); perror("fork failed."); return 3; } if (pid == (pid_t)0) { /* I am a child */ /* 子进程执行请求 */ if(proxyhost == NULL) { benchcore(host, proxyport, request); } else { benchcore(proxyhost, proxyport, request); } /* write results to pipe */ f = fdopen(mypipe[1], "w"); if (f == NULL) { perror("open pipe for writing failed."); return 3; } /* fprintf(stderr,"Child - %d %d\n",speed,failed); */ /* 将结果写入到管道中 */ fprintf(f, "%d %d %d\n", speed, failed, bytes); fclose(f); return 0; } else { /* 父进程读取管道,打印结果 */ printf("parent %d\n", getpid()); f = fdopen(mypipe[0], "r"); if (f == NULL) { perror("open pipe for reading failed."); return 3; } setvbuf(f, NULL, _IONBF, 0); speed = 0; failed = 0; bytes = 0; while(1) { pid = fscanf(f, "%d %d %d", &i, &j, &k); if (pid < 2) { fprintf(stderr,"Some of our childrens died.\n"); break; } speed += i; failed += j; bytes += k; /* fprintf(stderr,"*Knock* %d %d read=%d\n",speed,failed,pid); */ if (--clients == 0) { break; } } fclose(f); printf("\nSpeed=%d pages/min, %d bytes/sec.\nRequests: %d susceed, %d failed.\n", (int)((speed + failed) / (benchtime / 60.0f)), (int)(bytes / (float)benchtime), speed, failed); } return i; } void benchcore(const char *host, const int port, const char *req) { int rlen; char buf[1500]; int s, i; struct sigaction sa; /* 这个是关键,当程序执行到指定的秒数之后,发送 SIGALRM 信号 */ sa.sa_handler = alarm_handler; sa.sa_flags = 0; if (sigaction(SIGALRM, &sa, NULL)) { exit(3); } alarm(benchtime); rlen = strlen(req); /* 无限执行请求,直到 timerexpired 为 1 时返回 */ nexttry: while (1) { if (timerexpired) { if (failed > 0) { /* fprintf(stderr,"Correcting failed by signal\n"); */ failed--; } return; } s = Socket(host, port); if (s < 0) { failed++; continue; } if (rlen != write(s, req, rlen)) { failed++; close(s); continue; } if (http10 == 0) { /* 如果是 http/0.9 则关闭 socket 的写操作 */ if(shutdown(s, 1)) { failed++; close(s); continue; } } /* 如果等待响应数据返回,则读取响应数据,计算传输的字节数 */ if (force == 0) { /* read all available data from socket */ while(1) { if(timerexpired) { break; } i = read(s, buf, 1500); /* fprintf(stderr,"%d\n",i); */ if (i < 0) { failed++; close(s); goto nexttry; } else { if(i==0) { break; } else { bytes += i; } } } } if (close(s)) { failed++; continue; } /* 成功完成一次请求,并计数 */ speed++; } }
源码阅读笔记:webbench-1.5
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