Mercurial > hg > nginx-quic
view src/http/modules/ngx_http_mirror_module.c @ 8249:90cc7194e993
Upstream: excluded down servers from the next_upstream tries.
Previously, the number of next_upstream tries included servers marked
as "down", resulting in "no live upstreams" with the code 502 instead
of the code derived from an attempt to connect to the last tried "up"
server (ticket #2096).
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Fri, 27 Nov 2020 00:01:20 +0300 |
parents | 230d16d35ebc |
children |
line wrap: on
line source
/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { ngx_array_t *mirror; ngx_flag_t request_body; } ngx_http_mirror_loc_conf_t; typedef struct { ngx_int_t status; } ngx_http_mirror_ctx_t; static ngx_int_t ngx_http_mirror_handler(ngx_http_request_t *r); static void ngx_http_mirror_body_handler(ngx_http_request_t *r); static ngx_int_t ngx_http_mirror_handler_internal(ngx_http_request_t *r); static void *ngx_http_mirror_create_loc_conf(ngx_conf_t *cf); static char *ngx_http_mirror_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_mirror(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_http_mirror_init(ngx_conf_t *cf); static ngx_command_t ngx_http_mirror_commands[] = { { ngx_string("mirror"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_mirror, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("mirror_request_body"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_mirror_loc_conf_t, request_body), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_mirror_module_ctx = { NULL, /* preconfiguration */ ngx_http_mirror_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_mirror_create_loc_conf, /* create location configuration */ ngx_http_mirror_merge_loc_conf /* merge location configuration */ }; ngx_module_t ngx_http_mirror_module = { NGX_MODULE_V1, &ngx_http_mirror_module_ctx, /* module context */ ngx_http_mirror_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_mirror_handler(ngx_http_request_t *r) { ngx_int_t rc; ngx_http_mirror_ctx_t *ctx; ngx_http_mirror_loc_conf_t *mlcf; if (r != r->main) { return NGX_DECLINED; } mlcf = ngx_http_get_module_loc_conf(r, ngx_http_mirror_module); if (mlcf->mirror == NULL) { return NGX_DECLINED; } ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "mirror handler"); if (mlcf->request_body) { ctx = ngx_http_get_module_ctx(r, ngx_http_mirror_module); if (ctx) { return ctx->status; } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_mirror_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ctx->status = NGX_DONE; ngx_http_set_ctx(r, ctx, ngx_http_mirror_module); rc = ngx_http_read_client_request_body(r, ngx_http_mirror_body_handler); if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { return rc; } ngx_http_finalize_request(r, NGX_DONE); return NGX_DONE; } return ngx_http_mirror_handler_internal(r); } static void ngx_http_mirror_body_handler(ngx_http_request_t *r) { ngx_http_mirror_ctx_t *ctx; ctx = ngx_http_get_module_ctx(r, ngx_http_mirror_module); ctx->status = ngx_http_mirror_handler_internal(r); r->preserve_body = 1; r->write_event_handler = ngx_http_core_run_phases; ngx_http_core_run_phases(r); } static ngx_int_t ngx_http_mirror_handler_internal(ngx_http_request_t *r) { ngx_str_t *name; ngx_uint_t i; ngx_http_request_t *sr; ngx_http_mirror_loc_conf_t *mlcf; mlcf = ngx_http_get_module_loc_conf(r, ngx_http_mirror_module); name = mlcf->mirror->elts; for (i = 0; i < mlcf->mirror->nelts; i++) { if (ngx_http_subrequest(r, &name[i], &r->args, &sr, NULL, NGX_HTTP_SUBREQUEST_BACKGROUND) != NGX_OK) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } sr->header_only = 1; sr->method = r->method; sr->method_name = r->method_name; } return NGX_DECLINED; } static void * ngx_http_mirror_create_loc_conf(ngx_conf_t *cf) { ngx_http_mirror_loc_conf_t *mlcf; mlcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_mirror_loc_conf_t)); if (mlcf == NULL) { return NULL; } mlcf->mirror = NGX_CONF_UNSET_PTR; mlcf->request_body = NGX_CONF_UNSET; return mlcf; } static char * ngx_http_mirror_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_mirror_loc_conf_t *prev = parent; ngx_http_mirror_loc_conf_t *conf = child; ngx_conf_merge_ptr_value(conf->mirror, prev->mirror, NULL); ngx_conf_merge_value(conf->request_body, prev->request_body, 1); return NGX_CONF_OK; } static char * ngx_http_mirror(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_mirror_loc_conf_t *mlcf = conf; ngx_str_t *value, *s; value = cf->args->elts; if (ngx_strcmp(value[1].data, "off") == 0) { if (mlcf->mirror != NGX_CONF_UNSET_PTR) { return "is duplicate"; } mlcf->mirror = NULL; return NGX_CONF_OK; } if (mlcf->mirror == NULL) { return "is duplicate"; } if (mlcf->mirror == NGX_CONF_UNSET_PTR) { mlcf->mirror = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t)); if (mlcf->mirror == NULL) { return NGX_CONF_ERROR; } } s = ngx_array_push(mlcf->mirror); if (s == NULL) { return NGX_CONF_ERROR; } *s = value[1]; return NGX_CONF_OK; } static ngx_int_t ngx_http_mirror_init(ngx_conf_t *cf) { ngx_http_handler_pt *h; ngx_http_core_main_conf_t *cmcf; cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); h = ngx_array_push(&cmcf->phases[NGX_HTTP_PRECONTENT_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_http_mirror_handler; return NGX_OK; }