Mercurial > hg > nginx-quic
annotate src/http/ngx_http_postpone_filter_module.c @ 6750:cb330cd39030 stable-1.10
HTTP/2: implemented preread buffer for request body (closes #959).
Previously, the stream's window was kept zero in order to prevent a client
from sending the request body before it was requested (see 887cca40ba6a for
details). Until such initial window was acknowledged all requests with
data were rejected (see 0aa07850922f for details).
That approach revealed a number of problems:
1. Some clients (notably MS IE/Edge, Safari, iOS applications) show an error
or even crash if a stream is rejected;
2. This requires at least one RTT for every request with body before the
client receives window update and able to send data.
To overcome these problems the new directive "http2_body_preread_size" is
introduced. It sets the initial window and configures a special per stream
preread buffer that is used to save all incoming data before the body is
requested and processed.
If the directive's value is lower than the default initial window (65535),
as previously, all streams with data will be rejected until the new window
is acknowledged. Otherwise, no special processing is used and all requests
with data are welcome right from the connection start.
The default value is chosen to be 64k, which is bigger than the default
initial window. Setting it to zero is fully complaint to the previous
behavior.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Tue, 24 May 2016 17:37:52 +0300 |
parents | f026adb935ad |
children | d87f29d764ce |
rev | line source |
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509 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
509 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
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13 static ngx_int_t ngx_http_postpone_filter_add(ngx_http_request_t *r, |
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14 ngx_chain_t *in); |
681 | 15 static ngx_int_t ngx_http_postpone_filter_init(ngx_conf_t *cf); |
509 | 16 |
17 | |
18 static ngx_http_module_t ngx_http_postpone_filter_module_ctx = { | |
19 NULL, /* preconfiguration */ | |
681 | 20 ngx_http_postpone_filter_init, /* postconfiguration */ |
509 | 21 |
22 NULL, /* create main configuration */ | |
23 NULL, /* init main configuration */ | |
24 | |
25 NULL, /* create server configuration */ | |
26 NULL, /* merge server configuration */ | |
27 | |
28 NULL, /* create location configuration */ | |
29 NULL /* merge location configuration */ | |
30 }; | |
31 | |
32 | |
33 ngx_module_t ngx_http_postpone_filter_module = { | |
34 NGX_MODULE_V1, | |
35 &ngx_http_postpone_filter_module_ctx, /* module context */ | |
36 NULL, /* module directives */ | |
37 NGX_HTTP_MODULE, /* module type */ | |
541 | 38 NULL, /* init master */ |
681 | 39 NULL, /* init module */ |
541 | 40 NULL, /* init process */ |
41 NULL, /* init thread */ | |
42 NULL, /* exit thread */ | |
43 NULL, /* exit process */ | |
44 NULL, /* exit master */ | |
45 NGX_MODULE_V1_PADDING | |
509 | 46 }; |
47 | |
48 | |
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49 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; |
509 | 50 |
51 | |
52 static ngx_int_t | |
53 ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
54 { | |
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55 ngx_connection_t *c; |
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56 ngx_http_postponed_request_t *pr; |
509 | 57 |
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58 c = r->connection; |
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59 |
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60 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
583 | 61 "http postpone filter \"%V?%V\" %p", &r->uri, &r->args, in); |
527 | 62 |
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63 if (r != c->data) { |
509 | 64 |
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65 if (in) { |
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66 ngx_http_postpone_filter_add(r, in); |
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67 return NGX_OK; |
509 | 68 } |
69 | |
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70 #if 0 |
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71 /* TODO: SSI may pass NULL */ |
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72 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
5218 | 73 "http postpone filter NULL inactive request"); |
641 | 74 #endif |
75 | |
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76 return NGX_OK; |
583 | 77 } |
78 | |
79 if (r->postponed == NULL) { | |
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80 |
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81 if (in || c->buffered) { |
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82 return ngx_http_next_body_filter(r->main, in); |
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83 } |
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84 |
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85 return NGX_OK; |
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86 } |
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87 |
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88 if (in) { |
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89 ngx_http_postpone_filter_add(r, in); |
583 | 90 } |
91 | |
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92 do { |
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93 pr = r->postponed; |
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94 |
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95 if (pr->request) { |
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96 |
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97 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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98 "http postpone filter wake \"%V?%V\"", |
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99 &pr->request->uri, &pr->request->args); |
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100 |
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101 r->postponed = pr->next; |
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102 |
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103 c->data = pr->request; |
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104 |
3064 | 105 return ngx_http_post_request(pr->request, NULL); |
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106 } |
583 | 107 |
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108 if (pr->out == NULL) { |
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109 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
5218 | 110 "http postpone filter NULL output"); |
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111 |
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112 } else { |
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113 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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114 "http postpone filter output \"%V?%V\"", |
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115 &r->uri, &r->args); |
509 | 116 |
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117 if (ngx_http_next_body_filter(r->main, pr->out) == NGX_ERROR) { |
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118 return NGX_ERROR; |
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119 } |
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120 } |
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121 |
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122 r->postponed = pr->next; |
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123 |
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124 } while (r->postponed); |
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125 |
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126 return NGX_OK; |
509 | 127 } |
128 | |
129 | |
130 static ngx_int_t | |
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131 ngx_http_postpone_filter_add(ngx_http_request_t *r, ngx_chain_t *in) |
583 | 132 { |
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133 ngx_http_postponed_request_t *pr, **ppr; |
583 | 134 |
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135 if (r->postponed) { |
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136 for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ } |
583 | 137 |
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138 if (pr->request == NULL) { |
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139 goto found; |
583 | 140 } |
141 | |
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142 ppr = &pr->next; |
583 | 143 |
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144 } else { |
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145 ppr = &r->postponed; |
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146 } |
595 | 147 |
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148 pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t)); |
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149 if (pr == NULL) { |
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150 return NGX_ERROR; |
583 | 151 } |
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152 |
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153 *ppr = pr; |
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154 |
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155 pr->request = NULL; |
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156 pr->out = NULL; |
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157 pr->next = NULL; |
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158 |
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159 found: |
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160 |
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161 if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_OK) { |
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162 return NGX_OK; |
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163 } |
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164 |
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165 return NGX_ERROR; |
583 | 166 } |
167 | |
168 | |
169 static ngx_int_t | |
681 | 170 ngx_http_postpone_filter_init(ngx_conf_t *cf) |
509 | 171 { |
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172 ngx_http_next_body_filter = ngx_http_top_body_filter; |
509 | 173 ngx_http_top_body_filter = ngx_http_postpone_filter; |
174 | |
175 return NGX_OK; | |
176 } |