1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static ngx_int_t
ngx_http_postpone_filter_output_postponed_request(ngx_http_request_t *r);
static ngx_int_t ngx_http_postpone_filter_init(ngx_cycle_t *cycle);
static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_postpone_filter_module = {
NGX_MODULE_V1,
&ngx_http_postpone_filter_module_ctx, /* module context */
NULL, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
ngx_http_postpone_filter_init, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_http_output_body_filter_pt ngx_http_next_filter;
static ngx_int_t
ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_int_t rc;
ngx_chain_t *out;
ngx_http_postponed_request_t *pr, **ppr;
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http postpone filter \"%V?%V\" %p", &r->uri, &r->args, in);
if (r != r->connection->data || (r->postponed && in)) {
if (r->postponed) {
for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
ppr = pr->request ? &pr->next : NULL;
} else {
ppr = &r->postponed;
#if (NGX_SUPPRESS_WARN)
pr = NULL;
#endif
}
if (ppr) {
pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
if (pr == NULL) {
return NGX_ERROR;
}
*ppr = pr;
pr->request = NULL;
pr->out = NULL;
pr->next = NULL;
}
if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_ERROR) {
return NGX_ERROR;
}
if (r != r->connection->data || r->postponed->request) {
return NGX_AGAIN;
}
}
if (r->postponed) {
out = r->postponed->out;
if (out) {
r->postponed = r->postponed->next;
}
} else {
out = in;
}
rc = NGX_OK;
if (out
|| (r->connection->buffered
& (NGX_HTTP_LOWLEVEL_BUFFERED|NGX_LOWLEVEL_BUFFERED)))
{
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http postpone filter out \"%V?%V\"", &r->uri, &r->args);
if (!(out && out->next == NULL && ngx_buf_sync_only(out->buf))) {
rc = ngx_http_next_filter(r->main, out);
if (rc == NGX_ERROR) {
/* NGX_ERROR may be returned by any filter */
r->connection->error = 1;
}
}
}
if (r->postponed == NULL) {
return rc;
}
rc = ngx_http_postpone_filter_output_postponed_request(r);
if (rc == NGX_ERROR) {
/* NGX_ERROR may be returned by any filter */
r->connection->error = 1;
}
return rc;
}
static ngx_int_t
ngx_http_postpone_filter_output_postponed_request(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_chain_t *out;
ngx_http_postponed_request_t *pr;
for ( ;; ) {
pr = r->postponed;
if (pr == NULL) {
return NGX_OK;
}
if (pr->request) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http postpone filter handle \"%V?%V\"",
&pr->request->uri, &pr->request->args);
if (!pr->request->done) {
r->connection->data = pr->request;
return NGX_AGAIN;
}
rc = ngx_http_postpone_filter_output_postponed_request(pr->request);
if (rc == NGX_AGAIN || rc == NGX_ERROR) {
return rc;
}
r->postponed = r->postponed->next;
pr = r->postponed;
}
if (pr == NULL) {
return NGX_OK;
}
out = pr->out;
if (out) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http postpone filter out postponed \"%V?%V\"",
&r->uri, &r->args);
if (!(out && out->next == NULL && ngx_buf_sync_only(out->buf))) {
if (ngx_http_next_filter(r->main, out) == NGX_ERROR) {
return NGX_ERROR;
}
}
}
r->postponed = r->postponed->next;
}
}
static ngx_int_t
ngx_http_postpone_filter_init(ngx_cycle_t *cycle)
{
ngx_http_next_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_postpone_filter;
return NGX_OK;
}
|
