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 static ngx_int_t ngx_http_postpone_filter_add(ngx_http_request_t *r,
13 ngx_chain_t *in);
14 static ngx_int_t ngx_http_postpone_filter_init(ngx_conf_t *cf);
15
16
17 static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
18 NULL, /* preconfiguration */
19 ngx_http_postpone_filter_init, /* postconfiguration */
20
21 NULL, /* create main configuration */
22 NULL, /* init main configuration */
23
24 NULL, /* create server configuration */
25 NULL, /* merge server configuration */
26
27 NULL, /* create location configuration */
28 NULL /* merge location configuration */
29 };
30
31
32 ngx_module_t ngx_http_postpone_filter_module = {
33 NGX_MODULE_V1,
34 &ngx_http_postpone_filter_module_ctx, /* module context */
35 NULL, /* module directives */
36 NGX_HTTP_MODULE, /* module type */
37 NULL, /* init master */
38 NULL, /* init module */
39 NULL, /* init process */
40 NULL, /* init thread */
41 NULL, /* exit thread */
42 NULL, /* exit process */
43 NULL, /* exit master */
44 NGX_MODULE_V1_PADDING
45 };
46
47
48 static ngx_http_output_body_filter_pt ngx_http_next_filter;
49
50
51 static ngx_int_t
52 ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
53 {
54 ngx_connection_t *c;
55 ngx_http_postponed_request_t *pr;
56
57 c = r->connection;
58
59 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
60 "http postpone filter \"%V?%V\" %p", &r->uri, &r->args, in);
61
62 if (r != c->data) {
63
64 if (in) {
65 ngx_http_postpone_filter_add(r, in);
66 return NGX_OK;
67 }
68
69 #if 0
70 /* TODO: SSI may pass NULL */
71 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
72 "http postpone filter NULL inactive request",
73 &r->uri, &r->args);
74 #endif
75
76 return NGX_OK;
77 }
78
79 if (r->postponed == NULL) {
80
81 if (in || c->buffered) {
82 return ngx_http_next_filter(r->main, in);
83 }
84
85 return NGX_OK;
86 }
87
88 if (in) {
89 ngx_http_postpone_filter_add(r, in);
90 }
91
92 do {
93 pr = r->postponed;
94
95 if (pr->request) {
96
97 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
98 "http postpone filter wake \"%V?%V\"",
99 &pr->request->uri, &pr->request->args);
100
101 r->postponed = pr->next;
102
103 c->data = pr->request;
104
105 return ngx_http_post_request(pr->request, NULL);
106 }
107
108 if (pr->out == NULL) {
109 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
110 "http postpone filter NULL output",
111 &r->uri, &r->args);
112
113 } else {
114 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
115 "http postpone filter output \"%V?%V\"",
116 &r->uri, &r->args);
117
118 if (ngx_http_next_filter(r->main, pr->out) == NGX_ERROR) {
119 return NGX_ERROR;
120 }
121 }
122
123 r->postponed = pr->next;
124
125 } while (r->postponed);
126
127 return NGX_OK;
128 }
129
130
131 static ngx_int_t
132 ngx_http_postpone_filter_add(ngx_http_request_t *r, ngx_chain_t *in)
133 {
134 ngx_http_postponed_request_t *pr, **ppr;
135
136 if (r->postponed) {
137 for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
138
139 if (pr->request == NULL) {
140 goto found;
141 }
142
143 ppr = &pr->next;
144
145 } else {
146 ppr = &r->postponed;
147 }
148
149 pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
150 if (pr == NULL) {
151 return NGX_ERROR;
152 }
153
154 *ppr = pr;
155
156 pr->request = NULL;
157 pr->out = NULL;
158 pr->next = NULL;
159
160 found:
161
162 if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_OK) {
163 return NGX_OK;
164 }
165
166 return NGX_ERROR;
167 }
168
169
170 static ngx_int_t
171 ngx_http_postpone_filter_init(ngx_conf_t *cf)
172 {
173 ngx_http_next_filter = ngx_http_top_body_filter;
174 ngx_http_top_body_filter = ngx_http_postpone_filter;
175
176 return NGX_OK;
177 }
178
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