Mercurial > hg > nginx
view src/http/ngx_http_output_filter.c @ 83:a7e45c45a95c
nginx-0.0.1-2003-04-28-19:06:39 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Mon, 28 Apr 2003 15:06:39 +0000 |
parents | 6127d7075471 |
children | 37530da31268 |
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#include <ngx_config.h> #include <ngx_core.h> #include <ngx_files.h> #include <ngx_string.h> #include <ngx_hunk.h> #include <ngx_conf_file.h> #include <ngx_http.h> #include <ngx_http_config.h> #include <ngx_http_output_filter.h> static int ngx_http_output_filter_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src); static void *ngx_http_output_filter_create_conf(ngx_pool_t *pool); static char *ngx_http_output_filter_merge_conf(ngx_pool_t *pool, void *parent, void *child); static void ngx_http_output_filter_init(ngx_pool_t *pool, ngx_http_conf_filter_t *cf); static ngx_command_t ngx_http_output_filter_commands[] = { {ngx_string("output_buffer"), NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_output_filter_conf_t, hunk_size), NULL}, {ngx_null_string, 0, NULL, 0, 0, NULL} }; static ngx_http_module_t ngx_http_output_filter_module_ctx = { NGX_HTTP_MODULE, NULL, /* create server config */ NULL, /* init server config */ ngx_http_output_filter_create_conf, /* create location config */ ngx_http_output_filter_merge_conf /* merge location config */ }; ngx_module_t ngx_http_output_filter_module = { 0, /* module index */ &ngx_http_output_filter_module_ctx, /* module context */ ngx_http_output_filter_commands, /* module directives */ NGX_HTTP_MODULE_TYPE, /* module type */ NULL /* init module */ }; #define next_filter (*ngx_http_top_body_filter) #if 0 static int (*next_filter) (ngx_http_request_t *r, ngx_chain_t *ch); #endif #if 0 #define next_filter ngx_http_output_filter_module_ctx.next_output_body_filter #endif #define need_to_copy(r, hunk) \ (((r->filter & NGX_HTTP_FILTER_NEED_IN_MEMORY) \ && (hunk->type & NGX_HUNK_IN_MEMORY) == 0) \ || ((r->filter & NGX_HTTP_FILTER_NEED_TEMP) \ && (hunk->type & (NGX_HUNK_MEMORY|NGX_HUNK_MMAP)))) int ngx_http_output_filter(ngx_http_request_t *r, ngx_hunk_t *hunk) { int rc; size_t size; ngx_chain_t *ce, *le; ngx_http_output_filter_ctx_t *ctx; ngx_http_output_filter_conf_t *conf; ctx = (ngx_http_output_filter_ctx_t *) ngx_http_get_module_ctx(r->main ? r->main : r, ngx_http_output_filter_module_ctx); if (ctx == NULL) { ngx_http_create_ctx(r, ctx, ngx_http_output_filter_module_ctx, sizeof(ngx_http_output_filter_ctx_t), NGX_ERROR); } /* the short path for the case when the chain ctx->incoming is empty and there is no hunk or the hunk does not require the copy */ if (ctx->incoming == NULL) { if (hunk == NULL) { return next_filter(r, NULL); } /* we do not need to copy the incoming hunk to our hunk */ if (!need_to_copy(r, hunk)) { ctx->out.hunk = hunk; ctx->out.next = NULL; return next_filter(r, &ctx->out); } } /* add the incoming hunk to the chain ctx->incoming */ if (hunk) { /* the output of the only hunk is common case so we have the special chain entry ctx->in for it */ if (ctx->incoming == NULL) { ctx->in.hunk = hunk; ctx->in.next = NULL; ctx->incoming = &ctx->in; } else { for (ce = ctx->incoming; ce->next; ce = ce->next) { /* void */ ; } ngx_add_hunk_to_chain(ce->next, hunk, r->pool, NGX_ERROR); } } /* allocate our hunk if it's needed */ if (ctx->hunk == NULL) { conf = (ngx_http_output_filter_conf_t *) ngx_http_get_module_loc_conf(r->main ? r->main : r, ngx_http_output_filter_module_ctx); if (hunk->type & NGX_HUNK_LAST) { if (hunk->type & NGX_HUNK_IN_MEMORY) { size = hunk->last - hunk->pos; } else { size = hunk->file_last - hunk->file_pos; } if (size > conf->hunk_size) { size = conf->hunk_size; } } else { size = conf->hunk_size; } ngx_test_null(ctx->hunk, ngx_create_temp_hunk(r->pool, size, 50, 50), NGX_ERROR); ctx->hunk->type |= NGX_HUNK_RECYCLED; /* our hunk is still busy */ } else if (ctx->hunk->pos < ctx->hunk->last) { rc = next_filter(r, NULL); if (rc == NGX_ERROR || rc == NGX_AGAIN) { return rc; } /* NGX_OK */ /* set our hunk free */ ctx->hunk->pos = ctx->hunk->last = ctx->hunk->start; } #if (NGX_SUPPRESS_WARN) le = NULL; #endif /* process the chain ctx->incoming */ do { /* find the hunks that do not need to be copied ... */ for (ce = ctx->incoming; ce; ce = ce->next) { if (need_to_copy(r, ce->hunk)) { break; } le = ce; } /* ... and pass them to the next filter */ if (ctx->incoming != ce) { ctx->out.hunk = ctx->incoming->hunk; ctx->out.next = ctx->incoming->next; ctx->incoming = ce; le->next = NULL; rc = next_filter(r, &ctx->out); if (rc == NGX_ERROR || rc == NGX_AGAIN) { return rc; } /* NGX_OK */ if (ctx->incoming == NULL) { return rc; } } /* copy the first hunk or its part from the chain ctx->incoming to our hunk and pass it to the next filter */ do { rc = ngx_http_output_filter_copy_hunk(ctx->hunk, ctx->incoming->hunk); if (rc == NGX_ERROR) { return rc; } #if (NGX_FILE_AIO_READ) if (rc == NGX_AGAIN) { return rc; } #endif ctx->out.hunk = ctx->hunk; ctx->out.next = NULL; rc = next_filter(r, &ctx->out); if (rc == NGX_ERROR || rc == NGX_AGAIN) { return rc; } /* NGX_OK */ /* set our hunk free */ ctx->hunk->pos = ctx->hunk->last = ctx->hunk->start; /* repeat until we will have copied the whole first hunk from the chain ctx->incoming */ if (ctx->incoming->hunk->type & NGX_HUNK_IN_MEMORY) { size = ctx->incoming->hunk->last - ctx->incoming->hunk->pos; } else { size = ctx->incoming->hunk->file_last - ctx->incoming->hunk->file_pos; } } while (size); /* delete the completed hunk from the incoming chain */ ctx->incoming = ctx->incoming->next; /* repeat until we will have processed the whole chain ctx->incoming */ } while (ctx->incoming); return NGX_OK; } static int ngx_http_output_filter_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src) { ssize_t n, size; if (src->type & NGX_HUNK_IN_MEMORY) { size = src->last - src->pos; } else { size = src->file_last - src->file_pos; } if (size > (dst->end - dst->pos)) { size = dst->end - dst->pos; } if (src->type & NGX_HUNK_IN_MEMORY) { ngx_memcpy(dst->pos, src->pos, size); src->pos += size; dst->last += size; if (src->type & NGX_HUNK_FILE) { src->file_pos += size; } if ((src->type & NGX_HUNK_LAST) && src->pos == src->last) { dst->type |= NGX_HUNK_LAST; } } else { n = ngx_read_file(src->file, dst->pos, size, src->file_pos); if (n == NGX_ERROR) { return n; } #if (NGX_FILE_AIO_READ) if (n == NGX_AGAIN) { return n; } #endif if (n != size) { ngx_log_error(NGX_LOG_ALERT, src->file->log, 0, ngx_read_file_n " reads only %d of %d from file", n, size); if (n == 0) { return NGX_ERROR; } } src->file_pos += n; dst->last += n; if ((src->type & NGX_HUNK_LAST) && src->file_pos == src->file_last) { dst->type |= NGX_HUNK_LAST; } } return NGX_OK; } static void ngx_http_output_filter_init(ngx_pool_t *pool, ngx_http_conf_filter_t *cf) { #if 0 next_filter = cf->output_body_filter; cf->output_body_filter = NULL; #endif } static void *ngx_http_output_filter_create_conf(ngx_pool_t *pool) { ngx_http_output_filter_conf_t *conf; ngx_test_null(conf, ngx_pcalloc(pool, sizeof(ngx_http_output_filter_conf_t)), NULL); conf->hunk_size = NGX_CONF_UNSET; return conf; } static char *ngx_http_output_filter_merge_conf(ngx_pool_t *pool, void *parent, void *child) { ngx_http_output_filter_conf_t *prev = (ngx_http_output_filter_conf_t *) parent; ngx_http_output_filter_conf_t *conf = (ngx_http_output_filter_conf_t *) child; ngx_conf_size_merge(conf->hunk_size, prev->hunk_size, 32768); return NULL; }