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6692
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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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_stream.h>
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11
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12
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13 typedef struct {
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14 ngx_chain_t *from_upstream;
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15 ngx_chain_t *from_downstream;
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16 } ngx_stream_write_filter_ctx_t;
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17
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18
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19 static ngx_int_t ngx_stream_write_filter(ngx_stream_session_t *s,
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20 ngx_chain_t *in, ngx_uint_t from_upstream);
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21 static ngx_int_t ngx_stream_write_filter_init(ngx_conf_t *cf);
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22
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23
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24 static ngx_stream_module_t ngx_stream_write_filter_module_ctx = {
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25 NULL, /* preconfiguration */
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26 ngx_stream_write_filter_init, /* postconfiguration */
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27
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28 NULL, /* create main configuration */
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29 NULL, /* init main configuration */
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30
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31 NULL, /* create server configuration */
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32 NULL /* merge server configuration */
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33 };
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34
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35
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36 ngx_module_t ngx_stream_write_filter_module = {
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37 NGX_MODULE_V1,
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38 &ngx_stream_write_filter_module_ctx, /* module context */
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39 NULL, /* module directives */
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40 NGX_STREAM_MODULE, /* module type */
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41 NULL, /* init master */
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42 NULL, /* init module */
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43 NULL, /* init process */
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44 NULL, /* init thread */
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45 NULL, /* exit thread */
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46 NULL, /* exit process */
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47 NULL, /* exit master */
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48 NGX_MODULE_V1_PADDING
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49 };
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50
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51
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52 static ngx_int_t
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53 ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in,
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54 ngx_uint_t from_upstream)
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55 {
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56 off_t size;
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57 ngx_uint_t last, flush, sync;
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58 ngx_chain_t *cl, *ln, **ll, **out, *chain;
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59 ngx_connection_t *c;
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60 ngx_stream_write_filter_ctx_t *ctx;
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61
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62 ctx = ngx_stream_get_module_ctx(s, ngx_stream_write_filter_module);
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63
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64 if (ctx == NULL) {
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65 ctx = ngx_pcalloc(s->connection->pool,
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66 sizeof(ngx_stream_write_filter_ctx_t));
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67 if (ctx == NULL) {
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68 return NGX_ERROR;
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69 }
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70
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71 ngx_stream_set_ctx(s, ctx, ngx_stream_write_filter_module);
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72 }
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73
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74 if (from_upstream) {
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75 c = s->connection;
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76 out = &ctx->from_upstream;
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77
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78 } else {
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79 c = s->upstream->peer.connection;
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80 out = &ctx->from_downstream;
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81 }
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82
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83 if (c->error) {
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84 return NGX_ERROR;
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85 }
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86
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87 size = 0;
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88 flush = 0;
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89 sync = 0;
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90 last = 0;
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91 ll = out;
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92
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93 /* find the size, the flush point and the last link of the saved chain */
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94
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95 for (cl = *out; cl; cl = cl->next) {
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96 ll = &cl->next;
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97
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98 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
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99 "write old buf t:%d f:%d %p, pos %p, size: %z "
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100 "file: %O, size: %O",
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101 cl->buf->temporary, cl->buf->in_file,
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102 cl->buf->start, cl->buf->pos,
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103 cl->buf->last - cl->buf->pos,
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104 cl->buf->file_pos,
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105 cl->buf->file_last - cl->buf->file_pos);
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106
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107 #if 1
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108 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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109 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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110 "zero size buf in writer "
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111 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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112 cl->buf->temporary,
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113 cl->buf->recycled,
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114 cl->buf->in_file,
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115 cl->buf->start,
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116 cl->buf->pos,
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117 cl->buf->last,
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118 cl->buf->file,
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119 cl->buf->file_pos,
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120 cl->buf->file_last);
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121
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122 ngx_debug_point();
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123 return NGX_ERROR;
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124 }
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125 #endif
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126
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127 size += ngx_buf_size(cl->buf);
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128
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129 if (cl->buf->flush || cl->buf->recycled) {
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130 flush = 1;
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131 }
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132
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133 if (cl->buf->sync) {
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134 sync = 1;
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135 }
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136
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137 if (cl->buf->last_buf) {
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138 last = 1;
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139 }
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140 }
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141
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142 /* add the new chain to the existent one */
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143
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144 for (ln = in; ln; ln = ln->next) {
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145 cl = ngx_alloc_chain_link(c->pool);
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146 if (cl == NULL) {
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147 return NGX_ERROR;
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148 }
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149
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150 cl->buf = ln->buf;
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151 *ll = cl;
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152 ll = &cl->next;
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153
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154 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
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155 "write new buf t:%d f:%d %p, pos %p, size: %z "
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156 "file: %O, size: %O",
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157 cl->buf->temporary, cl->buf->in_file,
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158 cl->buf->start, cl->buf->pos,
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159 cl->buf->last - cl->buf->pos,
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160 cl->buf->file_pos,
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161 cl->buf->file_last - cl->buf->file_pos);
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162
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163 #if 1
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164 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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165 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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166 "zero size buf in writer "
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167 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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168 cl->buf->temporary,
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169 cl->buf->recycled,
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170 cl->buf->in_file,
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171 cl->buf->start,
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172 cl->buf->pos,
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173 cl->buf->last,
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174 cl->buf->file,
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175 cl->buf->file_pos,
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176 cl->buf->file_last);
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177
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178 ngx_debug_point();
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179 return NGX_ERROR;
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180 }
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181 #endif
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182
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183 size += ngx_buf_size(cl->buf);
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184
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185 if (cl->buf->flush || cl->buf->recycled) {
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186 flush = 1;
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187 }
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188
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189 if (cl->buf->sync) {
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190 sync = 1;
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191 }
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192
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193 if (cl->buf->last_buf) {
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194 last = 1;
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195 }
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196 }
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197
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198 *ll = NULL;
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199
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200 ngx_log_debug3(NGX_LOG_DEBUG_STREAM, c->log, 0,
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201 "stream write filter: l:%ui f:%ui s:%O", last, flush, size);
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202
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203 if (size == 0
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204 && !(c->buffered & NGX_LOWLEVEL_BUFFERED)
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205 && !(last && c->need_last_buf))
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206 {
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207 if (last || flush || sync) {
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208 for (cl = *out; cl; /* void */) {
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209 ln = cl;
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210 cl = cl->next;
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211 ngx_free_chain(c->pool, ln);
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212 }
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213
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214 *out = NULL;
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215 c->buffered &= ~NGX_STREAM_WRITE_BUFFERED;
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216
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217 return NGX_OK;
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218 }
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219
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220 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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221 "the stream output chain is empty");
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222
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223 ngx_debug_point();
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224
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225 return NGX_ERROR;
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226 }
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227
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228 chain = c->send_chain(c, *out, 0);
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229
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230 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0,
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231 "stream write filter %p", chain);
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232
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233 if (chain == NGX_CHAIN_ERROR) {
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234 c->error = 1;
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235 return NGX_ERROR;
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236 }
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237
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238 for (cl = *out; cl && cl != chain; /* void */) {
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239 ln = cl;
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240 cl = cl->next;
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241 ngx_free_chain(c->pool, ln);
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242 }
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243
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244 *out = chain;
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245
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246 if (chain) {
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247 if (c->shared) {
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248 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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249 "shared connection is busy");
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250 return NGX_ERROR;
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251 }
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252
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253 c->buffered |= NGX_STREAM_WRITE_BUFFERED;
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254 return NGX_AGAIN;
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255 }
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256
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257 c->buffered &= ~NGX_STREAM_WRITE_BUFFERED;
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258
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259 if (c->buffered & NGX_LOWLEVEL_BUFFERED) {
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260 return NGX_AGAIN;
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261 }
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262
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263 return NGX_OK;
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264 }
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265
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266
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267 static ngx_int_t
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268 ngx_stream_write_filter_init(ngx_conf_t *cf)
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269 {
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270 ngx_stream_top_filter = ngx_stream_write_filter;
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271
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272 return NGX_OK;
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273 }
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