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