Mercurial > hg > nginx
view src/http/ngx_http_output_filter.c @ 32:d45effe5854c
nginx-0.0.1-2002-12-19-10:08:55 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 19 Dec 2002 07:08:55 +0000 |
parents | 53cb81681040 |
children | b2e039840718 |
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#include <ngx_core.h> #include <ngx_files.h> #include <ngx_string.h> #include <ngx_hunk.h> #include <ngx_config_file.h> #include <ngx_http.h> #include <ngx_http_config.h> #include <ngx_http_output_filter.h> int ngx_http_output_filter(ngx_http_request_t *r, ngx_hunk_t *hunk); static int ngx_http_output_filter_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src); #if 0 static int ngx_http_output_filter_init( int (**next_filter)(ngx_http_request_t *r, ngx_chain_t *ch)); #endif static void *ngx_http_output_filter_create_conf(ngx_pool_t *pool); static ngx_command_t ngx_http_output_filter_commands[] = { {"output_buffer", ngx_conf_set_size_slot, offsetof(ngx_http_output_filter_conf_t, hunk_size), NGX_HTTP_LOC_CONF, NGX_CONF_TAKE1, "set output filter buffer size"}, {NULL} }; ngx_http_module_t ngx_http_output_filter_module = { NGX_HTTP_MODULE, NULL, /* create server config */ ngx_http_output_filter_create_conf, /* create location config */ ngx_http_output_filter_commands, /* module directives */ NULL, /* init module */ NULL, /* translate handler */ NULL, /* output header filter */ NULL, /* next output header filter */ ngx_http_output_filter, /* output body filter */ NULL /* next output body filter */ }; #if 0 static int (*ngx_http_output_next_filter)(ngx_http_request_t *r, ngx_chain_t *ch); #endif 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_http_create_ctx(r, ctx, ngx_http_output_filter_module, sizeof(ngx_http_output_filter_ctx_t)); #if 0 ctx->next_filter = ngx_http_output_next_filter; #endif } if (hunk && (hunk->type & NGX_HUNK_LAST)) ctx->last = 1; for (once = 1; once || ctx->in; once = 0) { /* 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 = ngx_http_output_filter_module. next_output_body_filter(r, NULL); #if 0 rc = ctx->next_filter(r, NULL); #endif /* 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_READ) 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 = ngx_http_output_filter_module. next_output_body_filter(r, &ctx->out); #if 0 rc = ctx->next_filter(r, &ctx->out); #endif; } /* 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) ctx->hunk->pos.mem = ctx->hunk->last.mem = ctx->hunk->start; else return rc; /* input chain is empty */ } else { if (hunk == NULL) { rc = ngx_http_output_filter_module. next_output_body_filter(r, NULL); #if 0 rc = ctx->next_filter(r, NULL); #endif; } 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 = ngx_http_output_filter_module. next_output_body_filter(r, NULL); #if 0 rc = ctx->next_filter(r, NULL); #endif } 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_READ) 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 = ngx_http_output_filter_module. next_output_body_filter(r, &ctx->out); #if 0 rc = ctx->next_filter(r, &ctx->out); #endif } } } else { ctx->out.hunk = hunk; ctx->out.next = NULL; rc = ngx_http_output_filter_module. next_output_body_filter(r, &ctx->out); #if 0 rc = ctx->next_filter(r, &ctx->out); #endif } } } 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) { if (ctx->hunk) 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_READ) } 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; } #if 1 if (src->type & NGX_HUNK_LAST) dst->type |= NGX_HUNK_LAST; #endif 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 = NGX_CONF_UNSET; return conf; } #if 0 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; *next_filter = NULL; return NGX_OK; } #endif