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comparison src/http/ngx_http_write_filter.c @ 0:f0b350454894 NGINX_0_1_0

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nginx 0.1.0 *) The first public version.
author Igor Sysoev <http://sysoev.ru>
date Mon, 04 Oct 2004 00:00:00 +0400
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children 4b2dafa26fe2
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-1:000000000000 0:f0b350454894
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_http.h>
11
12
13 typedef struct {
14 ngx_chain_t *out;
15 } ngx_http_write_filter_ctx_t;
16
17
18 static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle);
19
20
21 ngx_http_module_t ngx_http_write_filter_module_ctx = {
22 NULL, /* pre conf */
23
24 NULL, /* create main configuration */
25 NULL, /* init main configuration */
26
27 NULL, /* create server configuration */
28 NULL, /* merge server configuration */
29
30 NULL, /* create location configuration */
31 NULL, /* merge location configuration */
32 };
33
34
35 ngx_module_t ngx_http_write_filter_module = {
36 NGX_MODULE,
37 &ngx_http_write_filter_module_ctx, /* module context */
38 NULL, /* module directives */
39 NGX_HTTP_MODULE, /* module type */
40 ngx_http_write_filter_init, /* init module */
41 NULL /* init process */
42 };
43
44
45 ngx_int_t ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
46 {
47 int last;
48 off_t size, flush, sent;
49 ngx_chain_t *cl, *ln, **ll, *chain;
50 ngx_connection_t *c;
51 ngx_http_core_loc_conf_t *clcf;
52 ngx_http_write_filter_ctx_t *ctx;
53
54 ctx = ngx_http_get_module_ctx(r->main ? r->main : r,
55 ngx_http_write_filter_module);
56
57 if (ctx == NULL) {
58 ngx_http_create_ctx(r, ctx, ngx_http_write_filter_module,
59 sizeof(ngx_http_write_filter_ctx_t), NGX_ERROR);
60 }
61
62 size = 0;
63 flush = 0;
64 last = 0;
65 ll = &ctx->out;
66
67 /* find the size, the flush point and the last link of the saved chain */
68
69 for (cl = ctx->out; cl; cl = cl->next) {
70 ll = &cl->next;
71
72 size += ngx_buf_size(cl->buf);
73
74 if (cl->buf->flush || cl->buf->recycled) {
75 flush = size;
76 }
77
78 if (cl->buf->last_buf) {
79 last = 1;
80 }
81 }
82
83 /* add the new chain to the existent one */
84
85 for (ln = in; ln; ln = ln->next) {
86 ngx_alloc_link_and_set_buf(cl, ln->buf, r->pool, NGX_ERROR);
87 *ll = cl;
88 ll = &cl->next;
89
90 size += ngx_buf_size(cl->buf);
91
92 if (cl->buf->flush || cl->buf->recycled) {
93 flush = size;
94 }
95
96 if (cl->buf->last_buf) {
97 last = 1;
98 }
99 }
100
101 c = r->connection;
102
103 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
104 "http write filter: l:%d f:" OFF_T_FMT " s:" OFF_T_FMT,
105 last, flush, size);
106
107 clcf = ngx_http_get_module_loc_conf(r->main ? r->main : r,
108 ngx_http_core_module);
109
110 /*
111 * avoid the output if there is no last buf, no flush point,
112 * there are the incoming bufs and the size of all bufs
113 * is smaller than "postpone_output" directive
114 */
115
116 if (!last && flush == 0 && in && size < (off_t) clcf->postpone_output) {
117 return NGX_OK;
118 }
119
120 if (c->write->delayed) {
121 return NGX_AGAIN;
122 }
123
124 if (size == 0 && !c->buffered) {
125 if (!last) {
126 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
127 "the http output chain is empty");
128 }
129 return NGX_OK;
130 }
131
132 sent = c->sent;
133
134 chain = c->send_chain(c, ctx->out,
135 clcf->limit_rate ? clcf->limit_rate: OFF_T_MAX_VALUE);
136
137 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
138 "http write filter %X", chain);
139
140 if (clcf->limit_rate) {
141 sent = c->sent - sent;
142 c->write->delayed = 1;
143 ngx_add_timer(r->connection->write,
144 (ngx_msec_t) (sent * 1000 / clcf->limit_rate));
145 }
146
147 if (chain == NGX_CHAIN_ERROR) {
148 return NGX_ERROR;
149 }
150
151 ctx->out = chain;
152
153 if (chain || c->buffered) {
154 return NGX_AGAIN;
155 }
156
157 return NGX_OK;
158 }
159
160
161 static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle)
162 {
163 ngx_http_top_body_filter = ngx_http_write_filter;
164
165 return NGX_OK;
166 }