Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_not_modified_filter_module.c @ 4621:c90801720a0c
Upstream: smooth weighted round-robin balancing.
For edge case weights like { 5, 1, 1 } we now produce { a, a, b, a, c, a, a }
sequence instead of { c, b, a, a, a, a, a } produced previously.
Algorithm is as follows: on each peer selection we increase current_weight
of each eligible peer by its weight, select peer with greatest current_weight
and reduce its current_weight by total number of weight points distributed
among peers.
In case of { 5, 1, 1 } weights this gives the following sequence of
current_weight's:
a b c
0 0 0 (initial state)
5 1 1 (a selected)
-2 1 1
3 2 2 (a selected)
-4 2 2
1 3 3 (b selected)
1 -4 3
6 -3 4 (a selected)
-1 -3 4
4 -2 5 (c selected)
4 -2 -2
9 -1 -1 (a selected)
2 -1 -1
7 0 0 (a selected)
0 0 0
To preserve weight reduction in case of failures the effective_weight
variable was introduced, which usually matches peer's weight, but is
reduced temporarily on peer failures.
This change also fixes loop with backup servers and proxy_next_upstream
http_404 (ticket #47), and skipping alive upstreams in some cases if there
are multiple dead ones (ticket #64).
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 14 May 2012 09:57:20 +0000 |
parents | d620f497c50f |
children | 84cc73e01aa8 |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_http.h> |
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11 |
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12 |
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13 static ngx_int_t ngx_http_test_precondition(ngx_http_request_t *r); |
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14 static ngx_int_t ngx_http_test_not_modified(ngx_http_request_t *r); |
681 | 15 static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf); |
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16 |
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17 |
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18 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = { |
509 | 19 NULL, /* preconfiguration */ |
681 | 20 ngx_http_not_modified_filter_init, /* postconfiguration */ |
177
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22 NULL, /* create main configuration */ |
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23 NULL, /* init main configuration */ |
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24 |
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25 NULL, /* create server configuration */ |
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26 NULL, /* merge server configuration */ |
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27 |
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28 NULL, /* create location configuration */ |
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29 NULL /* merge location configuration */ |
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30 }; |
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31 |
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32 |
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33 ngx_module_t ngx_http_not_modified_filter_module = { |
509 | 34 NGX_MODULE_V1, |
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35 &ngx_http_not_modified_filter_module_ctx, /* module context */ |
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36 NULL, /* module directives */ |
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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 | |
135
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46 }; |
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47 |
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48 |
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49 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
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50 |
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51 |
2702 | 52 static ngx_int_t |
53 ngx_http_not_modified_header_filter(ngx_http_request_t *r) | |
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54 { |
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55 if (r->headers_out.status != NGX_HTTP_OK |
597 | 56 || r != r->main |
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57 || r->headers_out.last_modified_time == -1) |
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58 { |
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59 return ngx_http_next_header_filter(r); |
135
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60 } |
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61 |
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62 if (r->headers_in.if_unmodified_since) { |
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63 return ngx_http_test_precondition(r); |
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64 } |
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65 |
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66 if (r->headers_in.if_modified_since) { |
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67 return ngx_http_test_not_modified(r); |
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68 } |
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69 |
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70 return ngx_http_next_header_filter(r); |
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71 } |
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72 |
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73 |
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74 static ngx_int_t |
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75 ngx_http_test_precondition(ngx_http_request_t *r) |
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76 { |
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77 time_t iums; |
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78 |
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79 iums = ngx_http_parse_time(r->headers_in.if_unmodified_since->value.data, |
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80 r->headers_in.if_unmodified_since->value.len); |
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81 |
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82 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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83 "http iums:%d lm:%d", iums, r->headers_out.last_modified_time); |
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84 |
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85 if (iums >= r->headers_out.last_modified_time) { |
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86 return ngx_http_next_header_filter(r); |
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87 } |
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88 |
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89 return ngx_http_filter_finalize_request(r, NULL, |
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90 NGX_HTTP_PRECONDITION_FAILED); |
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91 } |
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92 |
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93 |
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94 static ngx_int_t |
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95 ngx_http_test_not_modified(ngx_http_request_t *r) |
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96 { |
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97 time_t ims; |
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98 ngx_http_core_loc_conf_t *clcf; |
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99 |
2496 | 100 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
101 | |
102 if (clcf->if_modified_since == NGX_HTTP_IMS_OFF) { | |
103 return ngx_http_next_header_filter(r); | |
104 } | |
105 | |
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106 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data, |
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107 r->headers_in.if_modified_since->value.len); |
577 | 108 |
257
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109 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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110 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time); |
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111 |
2361 | 112 if (ims != r->headers_out.last_modified_time) { |
113 | |
2496 | 114 if (clcf->if_modified_since == NGX_HTTP_IMS_EXACT |
2361 | 115 || ims < r->headers_out.last_modified_time) |
116 { | |
117 return ngx_http_next_header_filter(r); | |
118 } | |
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119 } |
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120 |
2361 | 121 r->headers_out.status = NGX_HTTP_NOT_MODIFIED; |
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122 r->headers_out.status_line.len = 0; |
2361 | 123 r->headers_out.content_type.len = 0; |
124 ngx_http_clear_content_length(r); | |
125 ngx_http_clear_accept_ranges(r); | |
126 | |
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127 if (r->headers_out.content_encoding) { |
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128 r->headers_out.content_encoding->hash = 0; |
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129 r->headers_out.content_encoding = NULL; |
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130 } |
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131 |
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132 return ngx_http_next_header_filter(r); |
135
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nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
133 } |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
134 |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
135 |
2702 | 136 static ngx_int_t |
137 ngx_http_not_modified_filter_init(ngx_conf_t *cf) | |
135
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
138 { |
155
46eb23d9471d
nginx-0.0.1-2003-10-22-20:38:26 import
Igor Sysoev <igor@sysoev.ru>
parents:
153
diff
changeset
|
139 ngx_http_next_header_filter = ngx_http_top_header_filter; |
135
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
140 ngx_http_top_header_filter = ngx_http_not_modified_header_filter; |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
141 |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
142 return NGX_OK; |
e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
143 } |