Mercurial > hg > nginx
view src/http/ngx_http_output_filter.c @ 9:6f58641241bb
nginx-0.0.1-2002-09-07-14:14:25 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Sat, 07 Sep 2002 10:14:25 +0000 |
parents | 708f8bb772ec |
children | 4f3879d9b6f6 |
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#include <ngx_core.h> #include <ngx_files.h> #include <ngx_string.h> #include <ngx_hunk.h> #include <ngx_http.h> #include <ngx_http_output_filter.h> static int ngx_http_output_filter_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src); static int ngx_http_output_filter_init( int (*next_filter)(ngx_http_request_t *r, ngx_chain_t *ch)); static void *ngx_http_output_filter_create_conf(ngx_pool_t *pool); static void *ngx_http_output_filter_set_hunk_size(ngx_pool_t *pool, void *conf, char *size); ngx_http_module_t ngx_http_output_filter_module = { NGX_HTTP_MODULE }; static int (*ngx_http_output_next_filter)(ngx_http_request_t *r, ngx_chain_t *ch); /* STUB */ int ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *ch); int ngx_http_output_filter_stub_init(ngx_pool_t *pool, void *loc_conf) { ngx_http_output_filter_conf_t *conf; ngx_http_output_filter_init(ngx_http_write_filter); conf = ngx_http_output_filter_create_conf(pool); ngx_http_output_filter_set_hunk_size(pool, conf, "32"); loc_conf = conf; } /* */ int ngx_http_output_filter(ngx_http_request_t *r, ngx_hunk_t *hunk) { int rc, once; size_t size; ssize_t n; ngx_chain_t *ce; ngx_http_output_filter_ctx_t *ctx; ngx_http_output_filter_conf_t *conf; ctx = (ngx_http_output_filter_ctx_t *) ngx_get_module_ctx(r->main ? r->main : r, ngx_http_output_filter_module); if (ctx == NULL) { ngx_test_null(ctx, ngx_pcalloc(r->pool, sizeof(ngx_http_output_filter_ctx_t)), NGX_ERROR); ctx->next_filter = ngx_http_output_next_filter; } ngx_log_debug(r->connection->log, "HUNK: x%x CTX-IN: x%x CTX->HUNK: x%x" _ hunk _ ctx->in _ ctx->hunk); if (hunk && (hunk->type & NGX_HUNK_LAST)) ctx->last = 1; for (once = 1; once || ctx->in; once--) { /* input chain is not empty */ if (ctx->in) { /* add hunk to input chain */ if (once && hunk) { for (ce = ctx->in; ce->next; ce = ce->next) /* void */ ; ngx_add_hunk_to_chain(ce->next, hunk, r->pool, NGX_ERROR); } /* our hunk is still busy */ if (ctx->hunk->pos.mem < ctx->hunk->last.mem) { rc = ctx->next_filter(r, NULL); /* our hunk is free */ } else { ctx->out.hunk = ctx->hunk; rc = ngx_http_output_filter_copy_hunk(ctx->hunk, ctx->in->hunk); #if (NGX_FILE_AIO) if (rc == NGX_AGAIN) return rc; #endif if (rc == NGX_ERROR) return rc; /* whole hunk is copied so we send to next filter chain part up to next hunk that need to be copied */ if (ctx->in->hunk->pos.mem == ctx->in->hunk->last.mem) { ctx->out.next = ctx->in->next; for (ce = ctx->in->next; ce; ce = ce->next) { if (ce->hunk->type & NGX_HUNK_FILE) break; if ((ce->hunk->type & NGX_HUNK_MEMORY|NGX_HUNK_MMAP) && (r->filter & NGX_HTTP_FILTER_NEED_TEMP)) break; } ctx->out.next = ce; } else { ctx->out.next = NULL; } rc = ctx->next_filter(r, &ctx->out); } /* delete completed hunks from input chain */ for (ce = ctx->in; ce; ce = ce->next) { if (ce->hunk->pos.file == ce->hunk->last.file) ctx->in = ce->next; } if (rc == NGX_OK) ctx->hunk->pos.mem = ctx->hunk->last.mem = ctx->hunk->start; else return rc; /* input chain is empty */ } else { if (hunk == NULL) { rc = ctx->next_filter(r, NULL); } else { /* we need to copy hunk to our hunk */ if (((r->filter & NGX_HTTP_FILTER_NEED_IN_MEMORY) && (hunk->type & NGX_HUNK_FILE)) || ((r->filter & NGX_HTTP_FILTER_NEED_TEMP) && (hunk->type & NGX_HUNK_MEMORY|NGX_HUNK_MMAP)) ) { /* out hunk is still busy */ if (ctx->hunk && ctx->hunk->pos.mem < ctx->hunk->last.mem) { ngx_add_hunk_to_chain(ctx->in, hunk, r->pool, NGX_ERROR); rc = ctx->next_filter(r, NULL); } else { if (ctx->hunk == NULL) { if (hunk->type & NGX_HUNK_LAST) { conf = (ngx_http_output_filter_conf_t *) ngx_get_module_loc_conf(r->main ? r->main : r, ngx_http_output_filter_module); size = hunk->last.mem - hunk->pos.mem; 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; rc = ngx_http_output_filter_copy_hunk(ctx->hunk, hunk); #if (NGX_FILE_AIO) if (rc == NGX_AGAIN) { /* add hunk to input chain */ ngx_add_hunk_to_chain(ctx->in, hunk, r->pool, NGX_ERROR); return rc; } #endif if (rc == NGX_ERROR) return rc; if (hunk->pos.mem < hunk->last.mem) ngx_add_hunk_to_chain(ctx->in, hunk, r->pool, NGX_ERROR); ctx->out.hunk = ctx->hunk; ctx->out.next = NULL; rc = ctx->next_filter(r, &ctx->out); } } } else { ctx->out.hunk = hunk; ctx->out.next = NULL; rc = ctx->next_filter(r, &ctx->out); } } } if (rc == NGX_OK && ctx->hunk) ctx->hunk->pos.mem = ctx->hunk->last.mem = ctx->hunk->start; } if (rc == NGX_OK && ctx->last) return NGX_OK; if (rc == NGX_OK) { ctx->hunk->pos.mem = ctx->hunk->last.mem = ctx->hunk->start; #if level_event ngx_del_event(r->connection->write, NGX_WRITE_EVENT); #endif } return rc; } static int ngx_http_output_filter_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src) { size_t size; ssize_t n; size = src->last.mem - src->pos.mem; if (size > dst->end - dst->pos.mem) size = dst->end - dst->pos.mem; if (src->type & NGX_HUNK_FILE) { n = ngx_read_file(src->file, dst->pos.mem, size, src->pos.file); if (n == NGX_ERROR) { return n; #if (NGX_FILE_AIO) } else if (n == NGX_AGAIN) { return n; #endif } else { ngx_assert((n == size), /* void */ ; , src->file->log, ngx_read_file_n " reads only %d of %d" _ n _ size); } src->pos.mem += n; dst->last.mem += n; } else { ngx_memcpy(src->pos.mem, dst->pos.mem, size); src->pos.mem += size; dst->last.mem += size; } return NGX_OK; } static int ngx_http_output_filter_init( int (*next_filter)(ngx_http_request_t *r, ngx_chain_t *ch)) { ngx_http_output_next_filter = next_filter; return NGX_OK; } 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 = 16384; } static void *ngx_http_output_filter_set_hunk_size(ngx_pool_t *pool, void *conf, char *size) { ngx_http_output_filter_conf_t *cf = (ngx_http_output_filter_conf_t *) conf; cf->hunk_size = atoi(size); if (cf->hunk_size <= 0) return "Error"; cf->hunk_size *= 1024; return NULL; }