fprintf(stderr, "haoning hahahah:%s\r\n","ningning");
或者
ngx_log_stderr(0,"haoning: ngx_http_hello_world_handler\"%s\"","haohao" );
但是如果打印
ngx_log_stderr(0,"haoning haohao subrequest in memory: %d", (int) r->subrequest_in_memory); ngx_log_stderr(0,"haoning haohao r->method : %d",(int) r->method); ngx_log_stderr(0,"haoning haohao r->http_version: %d",(int) r->http_version) ; ngx_log_stderr(0,"haoning haohao r->request_line.data: %s",r->request_line.data) ; ngx_log_stderr(0,"haoning haohao r->uri.data): %s",r->uri.data); ngx_log_stderr(0,"haoning haohao r->args.data: %s",r->args.data); ngx_log_stderr(0,"haoning haohao r->unparsed_uri.data: %s",r->unparsed_uri.data); ngx_log_stderr(0,"haoning haohao r->method_name.data: %s",r->method_name.data) ; ngx_log_stderr(0,"haoning haohao r->http_protocol.data: %s",r->http_protocol.data); ngx_log_stderr(0,"haoning haohao r->exten.data: %s",r->exten.data);
会报错
参考章亦春的echo
http://wiki.nginx.org/HttpEchoModule
源码中有个ddebug.h里面定义的打印log都输出到stderr
所以在这个模块的源码中把开头的
#ifndef DDEBUG #define DDEBUG 0 #endif
改成
#ifndef DDEBUG #define DDEBUG 1 #endif
当启动nginx的时候就输出log了 类似
e.c line 463. echo *** ngx_http_echo_helper: filter used = 1 at /root/hellogit/hello/graphviz/nginx/mymodule/echo-nginx-module-0.48/src/ngx_http_echo_module.c line 324. echo *** ngx_http_echo_helper: found raw arg hello at /root/hellogit/hello/graphviz/nginx/mymodule/echo-nginx-module-0.48/src/ngx_http_echo_module.c line 358. echo *** ngx_http_echo_echo_before_body: processing echo_before_body directive... at /root/hellogit/hello/graphviz/nginx/mymodule/echo-nginx-module-0.48/src/ngx_http_echo_module.c line 463. echo *** ngx_http_echo_helper: found raw arg world at /root/hellogit/hello/graphviz/nginx/mymodule/echo-nginx-module-0.48/src/ngx_http_echo_module.c line 358. echo *** ngx_http_echo_helper: filter used = 1 at /root/hellogit/hello/graphviz/nginx/mymodule/echo-nginx-module-0.48/src/ngx_http_echo_module.c line 324. echo *** ngx_http_echo_helper: found raw arg hiya at /root/hellogit/hello/graphviz/nginx/mymodule/echo-nginx-module-0.48/src/ngx_http_echo_module.c line 358. echo *** ngx_http_echo_helper: found raw arg igor at /root/hellogit/hello/graphviz/nginx/mymodule/echo-nginx-module-0.48/src/ngx_http_echo_module.c line 358.
可以重定向
./nginx >a.log 2>&1
★★★★★★第二种方法★★★★★★
还有一种是通用的 打印log的方法,跟nginx没关系
任何都适用,定义haolog.c haolog.h 在ngx_http_echo_module.c中引用haolog.h
/root/hellogit/hello/graphviz/nginx/mymodule/echo [root@VM_253_237_tlinux echo]# ls config haolog.c haolog.h nginx.conf ngx_http_echo_module.c shuoming.txt [root@VM_253_237_tlinux echo]#
config中标记新增的源码.c 和依赖的.h
ngx_addon_name=ngx_http_echo_module HTTP_MODULES="$HTTP_MODULES ngx_http_echo_module" NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_echo_module.c $ngx_addon_dir/haolog.c" NGX_ADDON_DEPS="$NGX_ADDON_DEPS $ngx_addon_dir/haolog.h" CORE_LIBS="$CORE_LIBS -lpcre"
log代码如下
[root@VM_253_237_tlinux echo]# cat haolog.h #include <stdio.h> #include <time.h> #define DEBUG_LOG( str ) log_append_to_file("/root/hellogit/hello/graphviz/nginx/mymodule/mylog/test.log", str,__FILE__,__LINE__ ); void log_append_to_file(char* filename,char* str,char* sourceFile,int fileLine); [root@VM_253_237_tlinux echo]
haolog.c:
[root@VM_253_237_tlinux echo]# cat haolog.c #include <stdio.h> #include <time.h> #define DEBUG_LOG( str ) log_append_to_file("/root/hellogit/hello/graphviz/nginx/mymodule/mylog/test.log", str,__FILE__,__LINE__ ); void log_append_to_file(char* filename,char* str,char* sourceFile,int fileLine) { time_t t; time(&t); struct tm* tp= localtime(&t); char now_str[100]; strftime(now_str, 100, "%Y-%m-%d %H:%M:%S", tp); FILE *fo; fo = fopen(filename, "a"); if (fo == 0) { return; } fprintf(fo, "%s %s(:%d):%s\r\n",now_str,sourceFile,fileLine, str); fclose(fo); } //int main(int argc, char **argv) //{ ///*********************define******************/ // // DEBUG_LOG("haoning----logmain.c"); // printf("Hello World!\n"); // return 0; //} [root@VM_253_237_tlinux echo]#
完整的nginx模块如下
[root@VM_253_237_tlinux echo]# cat ngx_http_echo_module.c /* * Copyright (C) fabricehao */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> #include <time.h> #include "haolog.h" /* Module config */ typedef struct { ngx_str_t ed; } ngx_http_echo_loc_conf_t; static char *ngx_http_echo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static void *ngx_http_echo_create_loc_conf(ngx_conf_t *cf); static char *ngx_http_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child); /* Directives */ static ngx_command_t ngx_http_echo_commands[] = { { ngx_string("echo"), NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_echo, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_echo_loc_conf_t, ed), NULL }, ngx_null_command }; /* Http context of the module */ static ngx_http_module_t ngx_http_echo_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_echo_create_loc_conf, /* create location configration */ ngx_http_echo_merge_loc_conf /* merge location configration */ }; /* Module */ ngx_module_t ngx_http_echo_module = { NGX_MODULE_V1, &ngx_http_echo_module_ctx, /* module context */ ngx_http_echo_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; /* Handler function */ static ngx_int_t ngx_http_echo_handler(ngx_http_request_t *r) { DEBUG_LOG("haoning.........ngx_http_echo_handler"); ngx_int_t rc; ngx_buf_t *b; ngx_chain_t out; ngx_http_echo_loc_conf_t *elcf; elcf = ngx_http_get_module_loc_conf(r, ngx_http_echo_module); if(!(r->method & (NGX_HTTP_HEAD|NGX_HTTP_GET|NGX_HTTP_POST))) { return NGX_HTTP_NOT_ALLOWED; } r->headers_out.content_type.len = sizeof("text/html") - 1; r->headers_out.content_type.data = (u_char *) "text/html"; r->headers_out.status = NGX_HTTP_OK; r->headers_out.content_length_n = elcf->ed.len; if(r->method == NGX_HTTP_HEAD) { DEBUG_LOG("haoning......ngx_http_echo_handlerr---r->method == NGX_HTTP_HEAD"); rc = ngx_http_send_header(r); if(rc != NGX_OK) { return rc; } } b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); if(b == NULL) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "Failed to allocate response buffer."); return NGX_HTTP_INTERNAL_SERVER_ERROR; } out.buf = b; out.next = NULL; b->pos = elcf->ed.data; b->last = elcf->ed.data + (elcf->ed.len); b->memory = 1; b->last_buf = 1; rc = ngx_http_send_header(r); if(rc != NGX_OK) { return rc; } DEBUG_LOG("haoning......ngx_http_output_filter"); return ngx_http_output_filter(r, &out); } static char * ngx_http_echo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { DEBUG_LOG("haoning --ngx_http_echo->>>>> init"); ngx_http_core_loc_conf_t *clcf; clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); clcf->handler = ngx_http_echo_handler; ngx_conf_set_str_slot(cf,cmd,conf); return NGX_CONF_OK; } static void * ngx_http_echo_create_loc_conf(ngx_conf_t *cf) { DEBUG_LOG("haoning --ngx_http_echo_create_loc_conf"); ngx_http_echo_loc_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_echo_loc_conf_t)); if (conf == NULL) { return NGX_CONF_ERROR; } conf->ed.len = 0; conf->ed.data = NULL; return conf; } static char * ngx_http_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) { DEBUG_LOG("haoning --ngx_http_echo_merge_loc_conf"); ngx_http_echo_loc_conf_t *prev = parent; ngx_http_echo_loc_conf_t *conf = child; ngx_conf_merge_str_value(conf->ed, prev->ed, ""); return NGX_CONF_OK; } [root@VM_253_237_tlinux echo]#
调用
DEBUG_LOG("haoning --ngx_http_echo_merge_loc_conf");
就打印到自定义的
/root/hellogit/hello/graphviz/nginx/mymodule/mylog/test.log
疑问,handler里的怎么打印不出来????