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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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35 ngx_http_postpone_filter_init, /* init module */
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36 NULL /* init process */
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37 };
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38
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39
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40 static ngx_http_output_body_filter_pt ngx_http_next_filter;
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41
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42
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43 static ngx_int_t
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44 ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
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45 {
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46 ngx_int_t rc;
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47 ngx_chain_t *out;
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48 ngx_http_postponed_request_t *pr, **ppr;
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49
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50 if (r->connection->write->error) {
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51 return NGX_ERROR;
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52 }
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53
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54 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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55 "http postpone filter \"%V\" %p", &r->uri, in);
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56
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57 if (r != r->connection->data || (r->postponed && in)) {
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58
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59 if (r->postponed) {
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60 for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
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61
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62 ppr = pr->request ? &pr->next : NULL;
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63
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64 } else {
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65 ppr = &r->postponed;
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66 #if (NGX_SUPPRESS_WARN)
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67 pr = NULL;
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68 #endif
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69 }
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70
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71 if (ppr) {
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72 pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
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73 if (pr == NULL) {
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74 return NGX_ERROR;
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75 }
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76
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77 *ppr = pr;
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78
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79 pr->request = NULL;
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80 pr->out = NULL;
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81 pr->next = NULL;
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82 }
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83
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84 if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_ERROR) {
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85 return NGX_ERROR;
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86 }
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87
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88 if (r != r->connection->data || r->postponed->request) {
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89 return NGX_AGAIN;
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90 }
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91 }
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92
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93 if (r->postponed) {
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94 out = r->postponed->out;
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95 r->postponed = r->postponed->next;
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96
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97 } else {
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98 out = in;
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99 }
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100
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62
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101 if (out == NULL && r->out == NULL && !r->connection->buffered) {
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58
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102 return NGX_OK;
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103 }
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104
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105 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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106 "http postpone filter out \"%V\"", &r->uri);
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107
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108 rc = ngx_http_next_filter(r->main ? r->main : r, out);
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109
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110 if (rc == NGX_ERROR) {
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111 /* NGX_ERROR may be returned by any filter */
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112 r->connection->write->error = 1;
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113 }
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114
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115 return rc;
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116 }
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117
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118
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119 static ngx_int_t
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120 ngx_http_postpone_filter_init(ngx_cycle_t *cycle)
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121 {
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122 ngx_http_next_filter = ngx_http_top_body_filter;
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123 ngx_http_top_body_filter = ngx_http_postpone_filter;
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124
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125 return NGX_OK;
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126 }
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