Mercurial > hg > ngx_http_compose_filter_module

annotate ngx_http_compose_filter_module.c @ 1:ba5471a3c988

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First working code, still in progress. Body filtering isn't complete. Notably, it probably will fail with complex body replies and with non-static subrequests.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 15 Jul 2008 05:38:48 +0400
parents 6535d94ae07d
children ed63d0bd4d14
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1
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2 /*
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3 * Copyright (C) Maxim Dounin
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4 */
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5
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6 #include <ngx_config.h>
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7 #include <ngx_core.h>
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8 #include <ngx_http.h>
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9
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10
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11 typedef struct {
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12 ngx_flag_t enable;
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13 } ngx_http_compose_conf_t;
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14
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15
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16 typedef struct {
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17 ngx_uint_t done;
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18 ngx_array_t parts;
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19 } ngx_http_compose_ctx_t;
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20
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21
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22 static void *ngx_http_compose_create_conf(ngx_conf_t *cf);
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23 static char *ngx_http_compose_merge_conf(ngx_conf_t *cf, void *parent,
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24 void *child);
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25 static ngx_int_t ngx_http_compose_init(ngx_conf_t *cf);
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26 static ngx_int_t ngx_http_compose_body_init(ngx_conf_t *cf);
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27
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28
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29 static ngx_command_t ngx_http_compose_commands[] = {
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30
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31 { ngx_string("compose"),
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32 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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33 ngx_conf_set_flag_slot,
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34 NGX_HTTP_LOC_CONF_OFFSET,
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35 offsetof(ngx_http_compose_conf_t, enable),
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36 NULL },
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37
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38 ngx_null_command
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39 };
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40
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41
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42 static ngx_http_module_t ngx_http_compose_module_ctx = {
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43 NULL, /* preconfiguration */
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44 ngx_http_compose_init, /* postconfiguration */
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45
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46 NULL, /* create main configuration */
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47 NULL, /* init main configuration */
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48
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49 NULL, /* create server configuration */
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50 NULL, /* merge server configuration */
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51
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52 ngx_http_compose_create_conf, /* create location configuration */
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53 ngx_http_compose_merge_conf /* merge location configuration */
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54 };
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55
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56
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57 ngx_module_t ngx_http_compose_filter_module = {
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58 NGX_MODULE_V1,
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59 &ngx_http_compose_module_ctx, /* module context */
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60 ngx_http_compose_commands, /* module directives */
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61 NGX_HTTP_MODULE, /* module type */
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62 NULL, /* init master */
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63 NULL, /* init module */
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64 NULL, /* init process */
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65 NULL, /* init thread */
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66 NULL, /* exit thread */
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67 NULL, /* exit process */
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68 NULL, /* exit master */
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69 NGX_MODULE_V1_PADDING
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70 };
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71
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72
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73 static ngx_http_module_t ngx_http_compose_body_module_ctx = {
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74 NULL, /* preconfiguration */
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75 ngx_http_compose_body_init, /* postconfiguration */
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76
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77 NULL, /* create main configuration */
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78 NULL, /* init main configuration */
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79
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80 NULL, /* create server configuration */
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81 NULL, /* merge server configuration */
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82
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83 NULL, /* create location configuration */
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84 NULL /* merge location configuration */
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85 };
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86
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87
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88 ngx_module_t ngx_http_compose_body_filter_module = {
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89 NGX_MODULE_V1,
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90 &ngx_http_compose_body_module_ctx, /* module context */
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91 NULL, /* module directives */
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92 NGX_HTTP_MODULE, /* module type */
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93 NULL, /* init master */
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94 NULL, /* init module */
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95 NULL, /* init process */
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96 NULL, /* init thread */
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97 NULL, /* exit thread */
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98 NULL, /* exit process */
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99 NULL, /* exit master */
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100 NGX_MODULE_V1_PADDING
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101 };
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102
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103
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104 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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105 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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106
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107
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108 static ngx_int_t
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109 ngx_http_compose_header_filter(ngx_http_request_t *r)
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110 {
1
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111 ngx_uint_t i;
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112 ngx_str_t *uri;
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113 ngx_list_part_t *part;
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114 ngx_table_elt_t *header;
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115 ngx_http_compose_conf_t *conf;
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116 ngx_http_compose_ctx_t *ctx;
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117
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118 conf = ngx_http_get_module_loc_conf(r, ngx_http_compose_filter_module);
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119
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120 if (!conf->enable) {
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121 return ngx_http_next_header_filter(r);
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122 }
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123
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124 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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125 "compose header filter");
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126
1
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127 /* create context */
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128
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129 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_compose_ctx_t));
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130 if (ctx == NULL) {
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131 return NGX_ERROR;
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132 }
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133
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134 if (ngx_array_init(&ctx->parts, r->pool, 1, sizeof(ngx_str_t))
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135 == NGX_ERROR)
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136 {
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137 return NGX_ERROR;
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138 }
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139
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140
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141 /*
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142 * Collect all X-Compose headers (or combined one?), store in context
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diff changeset
143 * for our body filter to make actual subrequests. Hide them from the
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parents: 0
diff changeset
144 * response.
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parents: 0
diff changeset
145 */
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parents: 0
diff changeset
146
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diff changeset
147 part = &r->headers_out.headers.part;
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diff changeset
148 header = part->elts;
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parents: 0
diff changeset
149
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diff changeset
150 for (i = 0; /* void */; i++) {
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parents: 0
diff changeset
151
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parents: 0
diff changeset
152 if (i >= part->nelts) {
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parents: 0
diff changeset
153 if (part->next == NULL) {
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parents: 0
diff changeset
154 break;
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parents: 0
diff changeset
155 }
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parents: 0
diff changeset
156
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diff changeset
157 part = part->next;
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diff changeset
158 header = part->elts;
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parents: 0
diff changeset
159 i = 0;
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parents: 0
diff changeset
160 }
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parents: 0
diff changeset
161
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parents: 0
diff changeset
162 if (header[i].hash == 0) {
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diff changeset
163 continue;
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parents: 0
diff changeset
164 }
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parents: 0
diff changeset
165
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diff changeset
166 if (header[i].key.len == sizeof("X-Compose-Length") - 1
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diff changeset
167 && ngx_strncasecmp(header[i].key.data, "X-Compose-Length",
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parents: 0
diff changeset
168 sizeof("X-Compose-Length") - 1)
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parents: 0
diff changeset
169 == 0)
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parents: 0
diff changeset
170 {
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diff changeset
171 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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parents: 0
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172 "compose body filter: bingo, %V, %V",
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parents: 0
diff changeset
173 &header[i].key, &header[i].value);
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parents: 0
diff changeset
174
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diff changeset
175 header[i].hash = 0;
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176
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diff changeset
177 r->headers_out.content_length_n = ngx_atoof(header[i].value.data,
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178 header[i].value.len);
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diff changeset
179
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diff changeset
180 if (r->headers_out.content_length) {
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diff changeset
181 r->headers_out.content_length->hash = 0;
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diff changeset
182 r->headers_out.content_length = NULL;
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parents: 0
diff changeset
183 }
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parents: 0
diff changeset
184 }
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parents: 0
diff changeset
185
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parents: 0
diff changeset
186 if (header[i].key.len == sizeof("X-Compose") - 1
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diff changeset
187 && ngx_strncasecmp(header[i].key.data, "X-Compose",
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parents: 0
diff changeset
188 sizeof("X-Compose") - 1)
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diff changeset
189 == 0)
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parents: 0
diff changeset
190 {
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diff changeset
191 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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diff changeset
192 "compose body filter: bingo, %V, %V",
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parents: 0
diff changeset
193 &header[i].key, &header[i].value);
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diff changeset
194
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diff changeset
195 header[i].hash = 0;
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diff changeset
196
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diff changeset
197 /*
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diff changeset
198 * XXX multiple headers with the same name must be combinable,
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diff changeset
199 * see RFC 2616 4.2 Message Headers
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diff changeset
200 */
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parents: 0
diff changeset
201
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diff changeset
202 uri = ngx_array_push(&ctx->parts);
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parents: 0
diff changeset
203 if (uri == NULL) {
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diff changeset
204 return NGX_ERROR;
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parents: 0
diff changeset
205 }
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parents: 0
diff changeset
206
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diff changeset
207 *uri = header[i].value;
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parents: 0
diff changeset
208 }
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parents: 0
diff changeset
209 }
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parents: 0
diff changeset
210
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parents: 0
diff changeset
211
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diff changeset
212 ngx_http_set_ctx(r, ctx, ngx_http_compose_filter_module);
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diff changeset
213
0
6535d94ae07d Compose filter module skeleton, currently does nothing.
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parents:
diff changeset
214 return ngx_http_next_header_filter(r);
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parents:
diff changeset
215 }
6535d94ae07d Compose filter module skeleton, currently does nothing.
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parents:
diff changeset
216
6535d94ae07d Compose filter module skeleton, currently does nothing.
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parents:
diff changeset
217
6535d94ae07d Compose filter module skeleton, currently does nothing.
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parents:
diff changeset
218 static ngx_int_t
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diff changeset
219 ngx_http_compose_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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parents:
diff changeset
220 {
1
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diff changeset
221 ngx_str_t *uri, args;
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diff changeset
222 ngx_int_t rc;
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diff changeset
223 ngx_uint_t i, flags;
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diff changeset
224 ngx_http_request_t *sr;
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diff changeset
225 ngx_http_compose_ctx_t *ctx;
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diff changeset
226
0
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parents:
diff changeset
227 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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parents:
diff changeset
228 "compose body filter");
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parents:
diff changeset
229
1
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diff changeset
230 ctx = ngx_http_get_module_ctx(r, ngx_http_compose_filter_module);
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parents: 0
diff changeset
231
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diff changeset
232 if (ctx == NULL) {
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diff changeset
233 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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parents: 0
diff changeset
234 "compose body filter: no ctx");
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diff changeset
235 return ngx_http_next_body_filter(r, in);
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parents: 0
diff changeset
236 }
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parents: 0
diff changeset
237
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diff changeset
238 if (ctx->done) {
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diff changeset
239 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
240 "compose body filter: done");
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parents: 0
diff changeset
241 /* XXX wrong: should skip data instead */
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diff changeset
242 return ngx_http_next_body_filter(r, in);
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parents: 0
diff changeset
243 }
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parents: 0
diff changeset
244
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diff changeset
245 ctx->done = 1;
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diff changeset
246
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diff changeset
247 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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parents: 0
diff changeset
248 "compose body filter, doing work");
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diff changeset
249
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
250 /*
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parents: 0
diff changeset
251 * Ignore body that comes to us, replace it with subrequests.
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parents: 0
diff changeset
252 */
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parents: 0
diff changeset
253
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diff changeset
254 uri = ctx->parts.elts;
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parents: 0
diff changeset
255
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parents: 0
diff changeset
256 for (i = 0; i < ctx->parts.nelts; i++) {
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parents: 0
diff changeset
257
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parents: 0
diff changeset
258 args.len = 0;
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parents: 0
diff changeset
259 args.data = NULL;
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parents: 0
diff changeset
260 flags = 0;
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parents: 0
diff changeset
261
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Maxim Dounin <mdounin@mdounin.ru>
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diff changeset
262 if (ngx_http_parse_unsafe_uri(r, &uri[i], &args, &flags) != NGX_OK) {
ba5471a3c988 First working code, still in progress.
Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
263 return NGX_ERROR;
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
264 }
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parents: 0
diff changeset
265
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
266 rc = ngx_http_subrequest(r, &uri[i], &args, &sr, NULL, flags);
ba5471a3c988 First working code, still in progress.
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parents: 0
diff changeset
267
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
268 if (rc == NGX_ERROR || rc == NGX_DONE) {
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parents: 0
diff changeset
269 return rc;
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parents: 0
diff changeset
270 }
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parents: 0
diff changeset
271 }
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
272
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
273 for ( ; in; in = in->next) {
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
274 in->buf->pos = in->buf->last;
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
275 in->buf->last_buf = 0;
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parents: 0
diff changeset
276 }
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parents: 0
diff changeset
277
ba5471a3c988 First working code, still in progress.
Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
278 /*
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
279 * XXX: what to do if non-static data? probably we should use post
ba5471a3c988 First working code, still in progress.
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parents: 0
diff changeset
280 * subrequest hook instead
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
281 */
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parents: 0
diff changeset
282
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Maxim Dounin <mdounin@mdounin.ru>
parents: 0
diff changeset
283 return ngx_http_send_special(r, NGX_HTTP_LAST);
0
6535d94ae07d Compose filter module skeleton, currently does nothing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
284 }
6535d94ae07d Compose filter module skeleton, currently does nothing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
285
6535d94ae07d Compose filter module skeleton, currently does nothing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
286
6535d94ae07d Compose filter module skeleton, currently does nothing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
287 static void *
6535d94ae07d Compose filter module skeleton, currently does nothing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
288 ngx_http_compose_create_conf(ngx_conf_t *cf)
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289 {
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290 ngx_http_compose_conf_t *conf;
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291
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292 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_compose_conf_t));
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293 if (conf == NULL) {
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294 return NGX_CONF_ERROR;
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295 }
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296
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297 conf->enable = NGX_CONF_UNSET;
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298
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299 return conf;
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300 }
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301
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302
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303 static char *
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304 ngx_http_compose_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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305 {
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306 ngx_http_compose_conf_t *prev = parent;
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307 ngx_http_compose_conf_t *conf = child;
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308
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309 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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310
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311 return NGX_CONF_OK;
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312 }
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313
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314
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315 static ngx_int_t
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316 ngx_http_compose_init(ngx_conf_t *cf)
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317 {
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318 ngx_http_next_header_filter = ngx_http_top_header_filter;
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319 ngx_http_top_header_filter = ngx_http_compose_header_filter;
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320
1
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321 return NGX_OK;
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322 }
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323
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324
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325 static ngx_int_t
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326 ngx_http_compose_body_init(ngx_conf_t *cf)
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327 {
0
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328 ngx_http_next_body_filter = ngx_http_top_body_filter;
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329 ngx_http_top_body_filter = ngx_http_compose_body_filter;
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330
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331 return NGX_OK;
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332 }