release/src/router/nginx/src/http/ngx_http_copy_filter_module.c

   1
   2 /*
   3  * Copyright (C) Igor Sysoev
   4  * Copyright (C) Nginx, Inc.
   5  */
   6
   7
   8 #include <ngx_config.h>
   9 #include <ngx_core.h>
  10 #include <ngx_http.h>
  11
  12
  13 typedef struct {
  14     ngx_bufs_t  bufs;
  15 } ngx_http_copy_filter_conf_t;
  16
  17
  18 #if (NGX_HAVE_FILE_AIO)
  19 static void ngx_http_copy_aio_handler(ngx_output_chain_ctx_t *ctx,
  20     ngx_file_t *file);
  21 static void ngx_http_copy_aio_event_handler(ngx_event_t *ev);
  22 #if (NGX_HAVE_AIO_SENDFILE)
  23 static void ngx_http_copy_aio_sendfile_event_handler(ngx_event_t *ev);
  24 #endif
  25 #endif
  26
  27 static void *ngx_http_copy_filter_create_conf(ngx_conf_t *cf);
  28 static char *ngx_http_copy_filter_merge_conf(ngx_conf_t *cf,
  29     void *parent, void *child);
  30 static ngx_int_t ngx_http_copy_filter_init(ngx_conf_t *cf);
  31
  32
  33 static ngx_command_t  ngx_http_copy_filter_commands[] = {
  34
  35     { ngx_string("output_buffers"),
  36       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
  37       ngx_conf_set_bufs_slot,
  38       NGX_HTTP_LOC_CONF_OFFSET,
  39       offsetof(ngx_http_copy_filter_conf_t, bufs),
  40       NULL },
  41
  42       ngx_null_command
  43 };
  44
  45
  46 static ngx_http_module_t  ngx_http_copy_filter_module_ctx = {
  47     NULL,                                  /* preconfiguration */
  48     ngx_http_copy_filter_init,             /* postconfiguration */
  49
  50     NULL,                                  /* create main configuration */
  51     NULL,                                  /* init main configuration */
  52
  53     NULL,                                  /* create server configuration */
  54     NULL,                                  /* merge server configuration */
  55
  56     ngx_http_copy_filter_create_conf,      /* create location configuration */
  57     ngx_http_copy_filter_merge_conf        /* merge location configuration */
  58 };
  59
  60
  61 ngx_module_t  ngx_http_copy_filter_module = {
  62     NGX_MODULE_V1,
  63     &ngx_http_copy_filter_module_ctx,      /* module context */
  64     ngx_http_copy_filter_commands,         /* module directives */
  65     NGX_HTTP_MODULE,                       /* module type */
  66     NULL,                                  /* init master */
  67     NULL,                                  /* init module */
  68     NULL,                                  /* init process */
  69     NULL,                                  /* init thread */
  70     NULL,                                  /* exit thread */
  71     NULL,                                  /* exit process */
  72     NULL,                                  /* exit master */
  73     NGX_MODULE_V1_PADDING
  74 };
  75
  76
  77 static ngx_http_output_body_filter_pt    ngx_http_next_body_filter;
  78
  79
  80 static ngx_int_t
  81 ngx_http_copy_filter(ngx_http_request_t *r, ngx_chain_t *in)
  82 {
  83     ngx_int_t                     rc;
  84     ngx_connection_t             *c;
  85     ngx_output_chain_ctx_t       *ctx;
  86     ngx_http_core_loc_conf_t     *clcf;
  87     ngx_http_copy_filter_conf_t  *conf;
  88
  89     c = r->connection;
  90
  91     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
  92                    "http copy filter: \"%V?%V\"", &r->uri, &r->args);
  93
  94     ctx = ngx_http_get_module_ctx(r, ngx_http_copy_filter_module);
  95
  96     if (ctx == NULL) {
  97         ctx = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t));
  98         if (ctx == NULL) {
  99             return NGX_ERROR;
 100         }
 101
 102         ngx_http_set_ctx(r, ctx, ngx_http_copy_filter_module);
 103
 104         conf = ngx_http_get_module_loc_conf(r, ngx_http_copy_filter_module);
 105         clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
 106
 107         ctx->sendfile = c->sendfile;
 108         ctx->need_in_memory = r->main_filter_need_in_memory
 109                               || r->filter_need_in_memory;
 110         ctx->need_in_temp = r->filter_need_temporary;
 111
 112         ctx->alignment = clcf->directio_alignment;
 113
 114         ctx->pool = r->pool;
 115         ctx->bufs = conf->bufs;
 116         ctx->tag = (ngx_buf_tag_t) &ngx_http_copy_filter_module;
 117
 118         ctx->output_filter = (ngx_output_chain_filter_pt)
 119                                   ngx_http_next_body_filter;
 120         ctx->filter_ctx = r;
 121
 122 #if (NGX_HAVE_FILE_AIO)
 123         if (ngx_file_aio) {
 124             if (clcf->aio) {
 125                 ctx->aio_handler = ngx_http_copy_aio_handler;
 126             }
 127 #if (NGX_HAVE_AIO_SENDFILE)
 128             c->aio_sendfile = (clcf->aio == NGX_HTTP_AIO_SENDFILE);
 129 #endif
 130         }
 131 #endif
 132
 133         if (in && in->buf && ngx_buf_size(in->buf)) {
 134             r->request_output = 1;
 135         }
 136     }
 137
 138 #if (NGX_HAVE_FILE_AIO)
 139     ctx->aio = r->aio;
 140 #endif
 141
 142     for ( ;; ) {
 143         rc = ngx_output_chain(ctx, in);
 144
 145         if (ctx->in == NULL) {
 146             r->buffered &= ~NGX_HTTP_COPY_BUFFERED;
 147
 148         } else {
 149             r->buffered |= NGX_HTTP_COPY_BUFFERED;
 150         }
 151
 152         ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
 153                        "http copy filter: %i \"%V?%V\"", rc, &r->uri, &r->args);
 154
 155 #if (NGX_HAVE_FILE_AIO && NGX_HAVE_AIO_SENDFILE)
 156
 157         if (c->busy_sendfile) {
 158             ssize_t                n;
 159             off_t                  offset;
 160             ngx_file_t            *file;
 161             ngx_http_ephemeral_t  *e;
 162
 163             if (r->aio) {
 164                 c->busy_sendfile = NULL;
 165                 return rc;
 166             }
 167
 168             file = c->busy_sendfile->file;
 169             offset = c->busy_sendfile->file_pos;
 170
 171             if (file->aio) {
 172                 c->aio_sendfile = (offset != file->aio->last_offset);
 173                 file->aio->last_offset = offset;
 174
 175                 if (c->aio_sendfile == 0) {
 176                     ngx_log_error(NGX_LOG_ALERT, c->log, 0,
 177                                   "sendfile(%V) returned busy again",
 178                                   &file->name);
 179                 }
 180             }
 181
 182             c->busy_sendfile = NULL;
 183             e = (ngx_http_ephemeral_t *) &r->uri_start;
 184
 185             n = ngx_file_aio_read(file, &e->aio_preload, 1, offset, r->pool);
 186
 187             if (n > 0) {
 188                 in = NULL;
 189                 continue;
 190             }
 191
 192             rc = n;
 193
 194             if (rc == NGX_AGAIN) {
 195                 file->aio->data = r;
 196                 file->aio->handler = ngx_http_copy_aio_sendfile_event_handler;
 197
 198                 r->main->blocked++;
 199                 r->aio = 1;
 200             }
 201         }
 202 #endif
 203
 204         return rc;
 205     }
 206 }
 207
 208
 209 #if (NGX_HAVE_FILE_AIO)
 210
 211 static void
 212 ngx_http_copy_aio_handler(ngx_output_chain_ctx_t *ctx, ngx_file_t *file)
 213 {
 214     ngx_http_request_t *r;
 215
 216     r = ctx->filter_ctx;
 217
 218     file->aio->data = r;
 219     file->aio->handler = ngx_http_copy_aio_event_handler;
 220
 221     r->main->blocked++;
 222     r->aio = 1;
 223     ctx->aio = 1;
 224 }
 225
 226
 227 static void
 228 ngx_http_copy_aio_event_handler(ngx_event_t *ev)
 229 {
 230     ngx_event_aio_t     *aio;
 231     ngx_http_request_t  *r;
 232
 233     aio = ev->data;
 234     r = aio->data;
 235
 236     r->main->blocked--;
 237     r->aio = 0;
 238
 239     r->connection->write->handler(r->connection->write);
 240 }
 241
 242
 243 #if (NGX_HAVE_AIO_SENDFILE)
 244
 245 static void
 246 ngx_http_copy_aio_sendfile_event_handler(ngx_event_t *ev)
 247 {
 248     ngx_event_aio_t     *aio;
 249     ngx_http_request_t  *r;
 250
 251     aio = ev->data;
 252     r = aio->data;
 253
 254     r->main->blocked--;
 255     r->aio = 0;
 256     ev->complete = 0;
 257
 258     r->connection->write->handler(r->connection->write);
 259 }
 260
 261 #endif
 262 #endif
 263
 264
 265 static void *
 266 ngx_http_copy_filter_create_conf(ngx_conf_t *cf)
 267 {
 268     ngx_http_copy_filter_conf_t *conf;
 269
 270     conf = ngx_palloc(cf->pool, sizeof(ngx_http_copy_filter_conf_t));
 271     if (conf == NULL) {
 272         return NULL;
 273     }
 274
 275     conf->bufs.num = 0;
 276
 277     return conf;
 278 }
 279
 280
 281 static char *
 282 ngx_http_copy_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child)
 283 {
 284     ngx_http_copy_filter_conf_t *prev = parent;
 285     ngx_http_copy_filter_conf_t *conf = child;
 286
 287     ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 1, 32768);
 288
 289     return NULL;
 290 }
 291
 292
 293 static ngx_int_t
 294 ngx_http_copy_filter_init(ngx_conf_t *cf)
 295 {
 296     ngx_http_next_body_filter = ngx_http_top_body_filter;
 297     ngx_http_top_body_filter = ngx_http_copy_filter;
 298
 299     return NGX_OK;
 300 }
 301