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509
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 static ngx_int_t ngx_http_postpone_filter_init(ngx_cycle_t *cycle);
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13
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14
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15 static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
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16 NULL, /* preconfiguration */
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17 NULL, /* postconfiguration */
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18
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19 NULL, /* create main configuration */
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20 NULL, /* init main configuration */
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21
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22 NULL, /* create server configuration */
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23 NULL, /* merge server configuration */
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24
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25 NULL, /* create location configuration */
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26 NULL /* merge location configuration */
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27 };
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28
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29
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30 ngx_module_t ngx_http_postpone_filter_module = {
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31 NGX_MODULE_V1,
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32 &ngx_http_postpone_filter_module_ctx, /* module context */
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33 NULL, /* module directives */
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34 NGX_HTTP_MODULE, /* module type */
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541
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35 NULL, /* init master */
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509
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36 ngx_http_postpone_filter_init, /* init module */
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541
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37 NULL, /* init process */
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38 NULL, /* init thread */
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39 NULL, /* exit thread */
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40 NULL, /* exit process */
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41 NULL, /* exit master */
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42 NGX_MODULE_V1_PADDING
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509
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43 };
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44
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45
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46 static ngx_http_output_body_filter_pt ngx_http_next_filter;
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47
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48
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49 static ngx_int_t
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50 ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
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51 {
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52 ngx_int_t rc;
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53 ngx_chain_t *out;
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519
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54 ngx_http_request_t *mr;
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509
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55 ngx_http_postponed_request_t *pr, **ppr;
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56
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527
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57 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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58 "http postpone filter \"%V\" %p", &r->uri, in);
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59
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60 if (r->connection->closed) {
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61
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62 if (r->postponed) {
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63 r->postponed = r->postponed->next;
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64 }
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65
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509
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66 return NGX_ERROR;
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67 }
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68
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69 if (r != r->connection->data || (r->postponed && in)) {
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70
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71 if (r->postponed) {
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72 for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
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73
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74 ppr = pr->request ? &pr->next : NULL;
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75
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76 } else {
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77 ppr = &r->postponed;
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78 #if (NGX_SUPPRESS_WARN)
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79 pr = NULL;
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80 #endif
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81 }
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82
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83 if (ppr) {
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84 pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
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85 if (pr == NULL) {
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86 return NGX_ERROR;
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87 }
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88
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89 *ppr = pr;
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90
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91 pr->request = NULL;
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92 pr->out = NULL;
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93 pr->next = NULL;
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94 }
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95
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96 if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_ERROR) {
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97 return NGX_ERROR;
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98 }
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99
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100 if (r != r->connection->data || r->postponed->request) {
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101 return NGX_AGAIN;
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102 }
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103 }
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104
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105 if (r->postponed) {
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106 out = r->postponed->out;
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107 r->postponed = r->postponed->next;
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108
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109 } else {
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110 out = in;
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111 }
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112
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519
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113 mr = r->main ? r->main : r;
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114
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115 if (out == NULL && mr->out == NULL && !mr->connection->buffered) {
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509
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116 return NGX_OK;
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117 }
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118
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119 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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120 "http postpone filter out \"%V\"", &r->uri);
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121
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519
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122 rc = ngx_http_next_filter(mr, out);
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509
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123
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124 if (rc == NGX_ERROR) {
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125 /* NGX_ERROR may be returned by any filter */
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527
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126 r->connection->closed = 1;
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509
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127 }
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128
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129 return rc;
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130 }
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131
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132
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133 static ngx_int_t
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134 ngx_http_postpone_filter_init(ngx_cycle_t *cycle)
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135 {
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136 ngx_http_next_filter = ngx_http_top_body_filter;
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137 ngx_http_top_body_filter = ngx_http_postpone_filter;
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138
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139 return NGX_OK;
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140 }
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