Nginx自定义模块中根据post参数路由到不同服务器的示例分析
如何使用Nginx的自定义模块实现根据post参数的不同路由到不同的服务器?
根据我们这个需求,我们需要实现一个自定义的Nginx模块,该模块能够根据post参数的不同路由到不同的服务器。
首先,我们需要定义一个模块,该模块需要实现一个handler方法,该方法需要接收两个参数,第一个参数是Nginx的请求结构体,第二个参数是Nginx的响应结构体。
在handler方法中,我们首先需要获取post参数,然后根据不同的参数值路由到不同的服务器。
具体的实现代码如下所示:
#include #include #include static char *ngx_http_mymodule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_http_mymodule_handler(ngx_http_request_t *r); static ngx_command_t ngx_http_mymodule_commands[] = { { ngx_string("mymodule"), /* directive */ NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS, /* location context and takes no arguments*/ ngx_http_mymodule, /* configuration handler */ NGX_HTTP_LOC_CONF_OFFSET, /* No offset. Only one context is supported. */ 0, /* No offset when storing the module configuration on struct. */ NULL}, ngx_null_command /* command termination */ }; /* Structure for a single configuration for mymodule. */ static ngx_http_module_t ngx_http_mymodule_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ NULL, /* create location configuration */ NULL /* merge location configuration */ }; /* Module definition. */ ngx_module_t ngx_http_mymodule_module = { NGX_MODULE_V1, &ngx_http_mymodule_module_ctx, /* module context */ ngx_http_mymodule_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 }; static ngx_int_t ngx_http_mymodule_handler(ngx_http_request_t *r) { if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) { return NGX_HTTP_NOT_ALLOWED; } /* Get args */ ngx_str_t args = r->args; /* Allocate a buffer for your response body */ ngx_buf_t *b; b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); if (b == NULL) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } /* Attach this buffer to your chain */ ngx_chain_t out; out.buf = b; out.next = NULL; /* Adjust the pointers of your buffer */ b->pos = (u_char *) "my response"; b->last = b->pos + sizeof("my response"); /* Set the status line */ r->headers_out.status = NGX_HTTP_OK; r->headers_out.content_length_n = sizeof("my response"); /* Send the headers */ ngx_int_t rc = ngx_http_send_header(r); if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { return rc; } /* Send the body, and return the status code */ return ngx_http_output_filter(r, &out); } static char *ngx_http_mymodule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_core_loc_conf_t *clcf; /* Install the handler for this location */ clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); clcf->handler = ngx_http_mymodule_handler; return NGX_CONF_OK; }
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