diff ngx_http_delay_module.c @ 0:9777bf89da35

Delay module.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 29 Jun 2010 22:08:53 +0400
parents
children aee676aa6c1f
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line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ngx_http_delay_module.c	Tue Jun 29 22:08:53 2010 +0400
@@ -0,0 +1,186 @@
+
+/*
+ * Copyright (C) Maxim Dounin
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+typedef struct {
+    ngx_msec_t                   delay;
+} ngx_http_delay_conf_t;
+
+
+static void ngx_http_delay_event_handler(ngx_http_request_t *r);
+
+
+static void *ngx_http_delay_create_conf(ngx_conf_t *cf);
+static char *ngx_http_delay_merge_conf(ngx_conf_t *cf, void *parent,
+    void *child);
+static ngx_int_t ngx_http_delay_init(ngx_conf_t *cf);
+
+
+static ngx_command_t  ngx_http_delay_commands[] = {
+
+    { ngx_string("delay"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_msec_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_delay_conf_t, delay),
+      NULL },
+
+      ngx_null_command
+};
+
+
+static ngx_http_module_t  ngx_http_delay_module_ctx = {
+    NULL,                                  /* preconfiguration */
+    ngx_http_delay_init,                   /* postconfiguration */
+
+    NULL,                                  /* create main configuration */
+    NULL,                                  /* init main configuration */
+
+    NULL,                                  /* create server configuration */
+    NULL,                                  /* merge server configuration */
+
+    ngx_http_delay_create_conf,            /* create location configration */
+    ngx_http_delay_merge_conf              /* merge location configration */
+};
+
+
+ngx_module_t  ngx_http_delay_module = {
+    NGX_MODULE_V1,
+    &ngx_http_delay_module_ctx,            /* module context */
+    ngx_http_delay_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_delay_handler(ngx_http_request_t *r)
+{
+    ngx_http_delay_conf_t  *dcf;
+
+    if (ngx_http_get_module_ctx(r, ngx_http_delay_module) != NULL) {
+        return NGX_DECLINED;
+    }
+
+    dcf = ngx_http_get_module_loc_conf(r, ngx_http_delay_module);
+
+    if (dcf->delay == NGX_CONF_UNSET_MSEC) {
+        return NGX_DECLINED;
+    }
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "delaying request");
+
+    if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    r->read_event_handler = ngx_http_test_reading;
+    r->write_event_handler = ngx_http_delay_event_handler;
+
+    ngx_add_timer(r->connection->write, dcf->delay);
+
+    ngx_http_set_ctx(r, (void *) 1, ngx_http_delay_module);
+
+    return NGX_AGAIN;
+}
+
+
+static void
+ngx_http_delay_event_handler(ngx_http_request_t *r)
+{
+    ngx_event_t  *wev;
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "delay");
+
+    wev = r->connection->write;
+
+    if (!wev->timedout) {
+
+        if (ngx_handle_write_event(wev, 0) != NGX_OK) {
+            ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+        }
+
+        return;
+    }
+
+    wev->timedout = 0;
+
+    if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
+        ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+        return;
+    }
+
+    r->read_event_handler = ngx_http_block_reading;
+    r->write_event_handler = ngx_http_core_run_phases;
+
+    ngx_http_core_run_phases(r);
+}
+
+
+static void *
+ngx_http_delay_create_conf(ngx_conf_t *cf)
+{
+    ngx_http_delay_conf_t  *conf;
+
+    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_delay_conf_t));
+    if (conf == NULL) {
+        return NULL;
+    }
+
+    /*
+     * set by ngx_pcalloc():
+     *
+     */
+
+    conf->delay = NGX_CONF_UNSET_MSEC;
+
+    return conf;
+}
+
+
+static char *
+ngx_http_delay_merge_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+    ngx_http_delay_conf_t *prev = parent;
+    ngx_http_delay_conf_t *conf = child;
+
+    ngx_conf_merge_msec_value(conf->delay, prev->delay,
+                              NGX_CONF_UNSET_MSEC);
+
+    return NGX_CONF_OK;
+}
+
+
+static ngx_int_t
+ngx_http_delay_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_PREACCESS_PHASE].handlers);
+    if (h == NULL) {
+        return NGX_ERROR;
+    }
+
+    *h = ngx_http_delay_handler;
+
+    return NGX_OK;
+}