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0
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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_event.h>
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10 #include <ngx_event_pipe.h>
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11
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12
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13 static ngx_int_t ngx_event_pipe_read_upstream(ngx_event_pipe_t *p);
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14 static ngx_int_t ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p);
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15
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16 static ngx_int_t ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p);
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16
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17 static ngx_inline void ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf);
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18 static ngx_inline void ngx_event_pipe_free_shadow_raw_buf(ngx_chain_t **free,
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0
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19 ngx_buf_t *buf);
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20 static ngx_int_t ngx_event_pipe_drain_chains(ngx_event_pipe_t *p);
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21
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22
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23 ngx_int_t ngx_event_pipe(ngx_event_pipe_t *p, int do_write)
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24 {
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25 u_int flags;
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26 ngx_event_t *rev, *wev;
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27
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28 for ( ;; ) {
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29 if (do_write) {
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32
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30 p->log->action = "sending to client";
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31
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0
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32 if (ngx_event_pipe_write_to_downstream(p) == NGX_ABORT) {
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33 return NGX_ABORT;
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34 }
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35 }
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36
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37 p->read = 0;
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38 p->upstream_blocked = 0;
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39
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32
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40 p->log->action = "reading upstream";
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41
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0
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42 if (ngx_event_pipe_read_upstream(p) == NGX_ABORT) {
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43 return NGX_ABORT;
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44 }
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45
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46 if (!p->read && !p->upstream_blocked) {
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47 break;
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48 }
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49
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50 do_write = 1;
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51 }
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52
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53 if (p->upstream->fd != -1) {
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54 rev = p->upstream->read;
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55
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56 flags = (rev->eof || rev->error) ? NGX_CLOSE_EVENT : 0;
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57
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58 if (ngx_handle_read_event(rev, flags) == NGX_ERROR) {
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59 return NGX_ABORT;
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60 }
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61
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62 if (rev->active) {
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63 ngx_add_timer(rev, p->read_timeout);
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64 }
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65 }
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66
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58
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67 if (p->downstream->fd != -1 && p->downstream->data == p->output_ctx) {
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0
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68 wev = p->downstream->write;
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2
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69 if (ngx_handle_write_event(wev, p->send_lowat) == NGX_ERROR) {
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0
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70 return NGX_ABORT;
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71 }
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72
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58
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73 if (wev->active && !wev->ready && !wev->delayed) {
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0
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74 ngx_add_timer(wev, p->send_timeout);
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75 }
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76 }
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77
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78 return NGX_OK;
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79 }
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80
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81
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32
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82 static ngx_int_t ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
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0
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83 {
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10
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84 ssize_t n, size;
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85 ngx_int_t rc;
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0
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86 ngx_buf_t *b;
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56
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87 ngx_chain_t *chain, *cl, *ln;
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0
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88
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89 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
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90 return NGX_OK;
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91 }
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92
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93 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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94 "pipe read upstream: %d", p->upstream->read->ready);
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95
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96 for ( ;; ) {
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97
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98 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
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99 break;
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100 }
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101
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102 if (p->preread_bufs == NULL && !p->upstream->read->ready) {
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103 break;
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104 }
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105
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106 if (p->preread_bufs) {
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107
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108 /* use the pre-read bufs if they exist */
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109
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110 chain = p->preread_bufs;
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111 p->preread_bufs = NULL;
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112 n = p->preread_size;
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113
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114 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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10
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115 "pipe preread: %z", n);
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0
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116
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117 if (n) {
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118 p->read = 1;
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119 }
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120
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121 } else {
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122
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123 /*
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124 * kqueue notifies about the end of file or a pending error.
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125 * This test allows not to allocate a buf on these conditions
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126 * and not to call ngx_recv_chain().
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127 */
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128
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129 if (p->upstream->read->available == 0
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130 && p->upstream->read->pending_eof)
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131 {
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132 p->upstream->read->ready = 0;
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133 p->upstream->read->eof = 0;
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134 p->upstream_eof = 1;
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135 p->read = 1;
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136
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18
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137 #if (NGX_HAVE_KQUEUE)
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0
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138 if (p->upstream->read->kq_errno) {
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139 p->upstream->read->error = 1;
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140 p->upstream_error = 1;
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141 p->upstream_eof = 0;
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142
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143 ngx_log_error(NGX_LOG_ERR, p->log,
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144 p->upstream->read->kq_errno,
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145 "readv() failed");
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146 }
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147 #endif
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148
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149 break;
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150 }
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151
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152 if (p->free_raw_bufs) {
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153
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154 /* use the free bufs if they exist */
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155
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156 chain = p->free_raw_bufs;
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157 if (p->single_buf) {
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158 p->free_raw_bufs = p->free_raw_bufs->next;
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159 chain->next = NULL;
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160 } else {
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161 p->free_raw_bufs = NULL;
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162 }
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163
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164 } else if (p->allocated < p->bufs.num) {
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165
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166 /* allocate a new buf if it's still allowed */
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167
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50
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168 b = ngx_create_temp_buf(p->pool, p->bufs.size);
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169 if (b == NULL) {
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0
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170 return NGX_ABORT;
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171 }
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172
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173 p->allocated++;
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174
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50
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175 chain = ngx_alloc_chain_link(p->pool);
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176 if (chain == NULL) {
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32
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177 return NGX_ABORT;
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178 }
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179
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180 chain->buf = b;
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181 chain->next = NULL;
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0
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182
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58
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183 } else if (!p->cachable
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184 && p->downstream->data == p->output_ctx
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76
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185 && p->downstream->write->ready
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186 && !p->downstream->write->delayed)
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58
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187 {
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0
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188 /*
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189 * if the bufs are not needed to be saved in a cache and
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190 * a downstream is ready then write the bufs to a downstream
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191 */
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192
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193 p->upstream_blocked = 1;
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194
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195 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
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196 "pipe downstream ready");
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197
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198 break;
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199
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200 } else if (p->cachable
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201 || p->temp_file->offset < p->max_temp_file_size)
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202 {
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203
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204 /*
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32
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205 * if it is allowed, then save some bufs from r->in
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0
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206 * to a temporary file, and add them to a r->out chain
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207 */
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208
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209 rc = ngx_event_pipe_write_chain_to_temp_file(p);
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210
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211 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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10
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212 "pipe temp offset: %O", p->temp_file->offset);
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0
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213
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70
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214 if (rc == NGX_BUSY) {
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215 break;
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216 }
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217
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0
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218 if (rc == NGX_AGAIN) {
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219 if (ngx_event_flags & NGX_USE_LEVEL_EVENT
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220 && p->upstream->read->active
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221 && p->upstream->read->ready)
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222 {
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223 if (ngx_del_event(p->upstream->read, NGX_READ_EVENT, 0)
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224 == NGX_ERROR)
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225 {
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226 return NGX_ABORT;
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227 }
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228 }
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229 }
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230
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231 if (rc != NGX_OK) {
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232 return rc;
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233 }
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234
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235 chain = p->free_raw_bufs;
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236 if (p->single_buf) {
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237 p->free_raw_bufs = p->free_raw_bufs->next;
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238 chain->next = NULL;
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239 } else {
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240 p->free_raw_bufs = NULL;
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241 }
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242
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243 } else {
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244
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32
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245 /* there are no bufs to read in */
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0
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246
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247 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
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248 "no pipe bufs to read in");
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249
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250 break;
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251 }
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252
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253 n = ngx_recv_chain(p->upstream, chain);
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254
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255 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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10
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256 "pipe recv chain: %z", n);
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0
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257
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258 if (p->free_raw_bufs) {
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259 chain->next = p->free_raw_bufs;
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260 }
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261 p->free_raw_bufs = chain;
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262
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263 if (n == NGX_ERROR) {
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264 p->upstream_error = 1;
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265 return NGX_ERROR;
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266 }
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267
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268 if (n == NGX_AGAIN) {
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269 if (p->single_buf) {
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270 ngx_event_pipe_remove_shadow_links(chain->buf);
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271 }
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272
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273 break;
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274 }
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275
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276 p->read = 1;
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277
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278 if (n == 0) {
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279 p->upstream_eof = 1;
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280 break;
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281 }
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282 }
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283
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284 p->read_length += n;
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285 cl = chain;
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286
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287 while (cl && n > 0) {
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288
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289 ngx_event_pipe_remove_shadow_links(cl->buf);
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290
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291 size = cl->buf->end - cl->buf->last;
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292
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293 if (n >= size) {
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294 cl->buf->last = cl->buf->end;
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295
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296 /* STUB */ cl->buf->num = p->num++;
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297
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298 if (p->input_filter(p, cl->buf) == NGX_ERROR) {
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299 return NGX_ABORT;
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300 }
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301
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302 n -= size;
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56
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303 ln = cl;
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0
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304 cl = cl->next;
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56
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305 ngx_free_chain(p->pool, ln);
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0
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306
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307 } else {
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308 cl->buf->last += n;
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309 n = 0;
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310 }
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311 }
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312
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313 p->free_raw_bufs = cl;
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314 }
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315
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316 #if (NGX_DEBUG)
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317
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2
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318 for (cl = p->busy; cl; cl = cl->next) {
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32
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319 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
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320 "pipe buf busy s:%d t:%d f:%d "
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321 "%p, pos %p, size: %z "
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322 "file: %O, size: %z",
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323 (cl->buf->shadow ? 1 : 0),
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324 cl->buf->temporary, cl->buf->in_file,
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0
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325 cl->buf->start, cl->buf->pos,
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32
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326 cl->buf->last - cl->buf->pos,
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327 cl->buf->file_pos,
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328 cl->buf->file_last - cl->buf->file_pos);
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0
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329 }
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330
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2
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331 for (cl = p->out; cl; cl = cl->next) {
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32
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332 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
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333 "pipe buf out s:%d t:%d f:%d "
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334 "%p, pos %p, size: %z "
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335 "file: %O, size: %z",
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336 (cl->buf->shadow ? 1 : 0),
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337 cl->buf->temporary, cl->buf->in_file,
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338 cl->buf->start, cl->buf->pos,
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339 cl->buf->last - cl->buf->pos,
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340 cl->buf->file_pos,
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341 cl->buf->file_last - cl->buf->file_pos);
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2
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342 }
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343
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344 for (cl = p->in; cl; cl = cl->next) {
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32
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345 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
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346 "pipe buf in s:%d t:%d f:%d "
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347 "%p, pos %p, size: %z "
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348 "file: %O, size: %z",
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349 (cl->buf->shadow ? 1 : 0),
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350 cl->buf->temporary, cl->buf->in_file,
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0
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351 cl->buf->start, cl->buf->pos,
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32
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352 cl->buf->last - cl->buf->pos,
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353 cl->buf->file_pos,
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354 cl->buf->file_last - cl->buf->file_pos);
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0
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355 }
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356
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357 for (cl = p->free_raw_bufs; cl; cl = cl->next) {
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32
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358 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
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359 "pipe buf free s:%d t:%d f:%d "
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360 "%p, pos %p, size: %z "
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361 "file: %O, size: %z",
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362 (cl->buf->shadow ? 1 : 0),
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363 cl->buf->temporary, cl->buf->in_file,
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364 cl->buf->start, cl->buf->pos,
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365 cl->buf->last - cl->buf->pos,
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366 cl->buf->file_pos,
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367 cl->buf->file_last - cl->buf->file_pos);
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0
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368 }
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369
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370 #endif
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371
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372 if ((p->upstream_eof || p->upstream_error) && p->free_raw_bufs) {
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373
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374 /* STUB */ p->free_raw_bufs->buf->num = p->num++;
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375
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376 if (p->input_filter(p, p->free_raw_bufs->buf) == NGX_ERROR) {
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377 return NGX_ABORT;
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378 }
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379
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380 p->free_raw_bufs = p->free_raw_bufs->next;
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381
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382 if (p->free_bufs) {
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383 for (cl = p->free_raw_bufs; cl; cl = cl->next) {
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2
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384 if (cl->buf->shadow == NULL) {
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385 ngx_pfree(p->pool, cl->buf->start);
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386 }
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0
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387 }
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388 }
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389 }
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390
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391 if (p->cachable && p->in) {
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392 if (ngx_event_pipe_write_chain_to_temp_file(p) == NGX_ABORT) {
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393 return NGX_ABORT;
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394 }
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395 }
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396
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397 return NGX_OK;
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398 }
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399
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400
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32
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401 static ngx_int_t ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p)
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0
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402 {
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28
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403 size_t bsize;
|
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0
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404 ngx_uint_t flush;
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32
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405 ngx_chain_t *out, **ll, *cl;
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0
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406
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|
|
407 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
|
408 "pipe write downstream: %d", p->downstream->write->ready);
|
|
|
409
|
|
|
410 for ( ;; ) {
|
|
|
411 if (p->downstream_error) {
|
|
|
412 return ngx_event_pipe_drain_chains(p);
|
|
|
413 }
|
|
|
414
|
|
|
415 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
|
|
|
416
|
|
|
417 /* pass the p->out and p->in chains to the output filter */
|
|
|
418
|
|
58
|
419 for (cl = p->busy; cl; cl = cl->next) {
|
|
|
420 cl->buf->recycled = 0;
|
|
|
421 }
|
|
|
422
|
|
0
|
423 if (p->out) {
|
|
|
424 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
|
425 "pipe write downstream flush out");
|
|
|
426
|
|
58
|
427 for (cl = p->out; cl; cl = cl->next) {
|
|
|
428 cl->buf->recycled = 0;
|
|
|
429 }
|
|
|
430
|
|
0
|
431 if (p->output_filter(p->output_ctx, p->out) == NGX_ERROR) {
|
|
|
432 p->downstream_error = 1;
|
|
|
433 return ngx_event_pipe_drain_chains(p);
|
|
|
434 }
|
|
|
435
|
|
|
436 p->out = NULL;
|
|
|
437 }
|
|
|
438
|
|
|
439 if (p->in) {
|
|
|
440 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
|
441 "pipe write downstream flush in");
|
|
|
442
|
|
58
|
443 for (cl = p->in; cl; cl = cl->next) {
|
|
|
444 cl->buf->recycled = 0;
|
|
|
445 }
|
|
|
446
|
|
0
|
447 if (p->output_filter(p->output_ctx, p->in) == NGX_ERROR) {
|
|
|
448 p->downstream_error = 1;
|
|
|
449 return ngx_event_pipe_drain_chains(p);
|
|
|
450 }
|
|
|
451
|
|
|
452 p->in = NULL;
|
|
|
453 }
|
|
|
454
|
|
|
455 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
|
456 "pipe write downstream done");
|
|
|
457
|
|
|
458 /* TODO: free unused bufs */
|
|
|
459
|
|
|
460 p->downstream_done = 1;
|
|
|
461 break;
|
|
|
462 }
|
|
|
463
|
|
58
|
464 if (p->downstream->data != p->output_ctx
|
|
76
|
465 || !p->downstream->write->ready
|
|
|
466 || p->downstream->write->delayed)
|
|
58
|
467 {
|
|
0
|
468 break;
|
|
|
469 }
|
|
|
470
|
|
28
|
471 /* bsize is the size of the busy recycled bufs */
|
|
0
|
472
|
|
|
473 bsize = 0;
|
|
|
474
|
|
|
475 for (cl = p->busy; cl; cl = cl->next) {
|
|
28
|
476 if (cl->buf->recycled) {
|
|
|
477 bsize += cl->buf->end - cl->buf->start;
|
|
|
478 }
|
|
0
|
479 }
|
|
|
480
|
|
|
481 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
28
|
482 "pipe write busy: %uz", bsize);
|
|
0
|
483
|
|
|
484 out = NULL;
|
|
|
485 ll = NULL;
|
|
|
486 flush = 0;
|
|
|
487
|
|
|
488 for ( ;; ) {
|
|
|
489 if (p->out) {
|
|
|
490 cl = p->out;
|
|
|
491
|
|
28
|
492 if (cl->buf->recycled
|
|
|
493 && bsize + cl->buf->last - cl->buf->pos > p->busy_size)
|
|
|
494 {
|
|
0
|
495 flush = 1;
|
|
|
496 break;
|
|
|
497 }
|
|
|
498
|
|
|
499 p->out = p->out->next;
|
|
28
|
500
|
|
|
501 ngx_event_pipe_free_shadow_raw_buf(&p->free_raw_bufs, cl->buf);
|
|
0
|
502
|
|
|
503 } else if (!p->cachable && p->in) {
|
|
|
504 cl = p->in;
|
|
|
505
|
|
28
|
506 if (cl->buf->recycled
|
|
|
507 && bsize + cl->buf->last - cl->buf->pos > p->busy_size)
|
|
|
508 {
|
|
0
|
509 flush = 1;
|
|
|
510 break;
|
|
|
511 }
|
|
|
512
|
|
|
513 p->in = p->in->next;
|
|
|
514
|
|
|
515 } else {
|
|
|
516 break;
|
|
|
517 }
|
|
|
518
|
|
28
|
519 if (cl->buf->recycled) {
|
|
|
520 bsize += cl->buf->last - cl->buf->pos;
|
|
|
521 }
|
|
|
522
|
|
0
|
523 cl->next = NULL;
|
|
50
|
524
|
|
|
525 if (out) {
|
|
|
526 *ll = cl;
|
|
|
527 } else {
|
|
|
528 out = cl;
|
|
|
529 }
|
|
|
530 ll = &cl->next;
|
|
0
|
531 }
|
|
|
532
|
|
|
533 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
10
|
534 "pipe write: out:%p, f:%d", out, flush);
|
|
0
|
535
|
|
|
536 if (out == NULL && !flush) {
|
|
|
537 break;
|
|
|
538 }
|
|
|
539
|
|
|
540 if (p->output_filter(p->output_ctx, out) == NGX_ERROR) {
|
|
|
541 p->downstream_error = 1;
|
|
|
542 return ngx_event_pipe_drain_chains(p);
|
|
|
543 }
|
|
|
544
|
|
|
545 ngx_chain_update_chains(&p->free, &p->busy, &out, p->tag);
|
|
|
546
|
|
|
547 for (cl = p->free; cl; cl = cl->next) {
|
|
|
548
|
|
|
549 if (cl->buf->temp_file) {
|
|
|
550 if (p->cachable || !p->cyclic_temp_file) {
|
|
|
551 continue;
|
|
|
552 }
|
|
|
553
|
|
|
554 /* reset p->temp_offset if all bufs had been sent */
|
|
|
555
|
|
|
556 if (cl->buf->file_last == p->temp_file->offset) {
|
|
|
557 p->temp_file->offset = 0;
|
|
|
558 }
|
|
|
559 }
|
|
|
560
|
|
|
561 /* TODO: free buf if p->free_bufs && upstream done */
|
|
|
562
|
|
|
563 /* add the free shadow raw buf to p->free_raw_bufs */
|
|
|
564
|
|
|
565 if (cl->buf->last_shadow) {
|
|
32
|
566 if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) {
|
|
|
567 return NGX_ABORT;
|
|
|
568 }
|
|
0
|
569
|
|
|
570 cl->buf->last_shadow = 0;
|
|
|
571 }
|
|
|
572
|
|
|
573 cl->buf->shadow = NULL;
|
|
|
574 }
|
|
|
575 }
|
|
|
576
|
|
|
577 return NGX_OK;
|
|
|
578 }
|
|
|
579
|
|
|
580
|
|
|
581 static ngx_int_t ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p)
|
|
|
582 {
|
|
|
583 ssize_t size, bsize;
|
|
|
584 ngx_buf_t *b;
|
|
|
585 ngx_chain_t *cl, *tl, *next, *out, **ll, **last_free, fl;
|
|
|
586
|
|
|
587 if (p->buf_to_file) {
|
|
|
588 fl.buf = p->buf_to_file;
|
|
|
589 fl.next = p->in;
|
|
|
590 out = &fl;
|
|
|
591
|
|
|
592 } else {
|
|
|
593 out = p->in;
|
|
|
594 }
|
|
|
595
|
|
|
596 if (!p->cachable) {
|
|
|
597
|
|
|
598 size = 0;
|
|
|
599 cl = out;
|
|
|
600 ll = NULL;
|
|
|
601
|
|
|
602 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
10
|
603 "pipe offset: %O", p->temp_file->offset);
|
|
0
|
604
|
|
|
605 do {
|
|
|
606 bsize = cl->buf->last - cl->buf->pos;
|
|
|
607
|
|
|
608 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, p->log, 0,
|
|
10
|
609 "pipe buf %p, pos %p, size: %z",
|
|
0
|
610 cl->buf->start, cl->buf->pos, bsize);
|
|
|
611
|
|
|
612 if ((size + bsize > p->temp_file_write_size)
|
|
|
613 || (p->temp_file->offset + size + bsize > p->max_temp_file_size))
|
|
|
614 {
|
|
|
615 break;
|
|
|
616 }
|
|
|
617
|
|
|
618 size += bsize;
|
|
|
619 ll = &cl->next;
|
|
|
620 cl = cl->next;
|
|
|
621
|
|
|
622 } while (cl);
|
|
|
623
|
|
10
|
624 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "size: %z", size);
|
|
0
|
625
|
|
70
|
626 if (ll == NULL) {
|
|
|
627 return NGX_BUSY;
|
|
|
628 }
|
|
|
629
|
|
0
|
630 if (cl) {
|
|
|
631 p->in = cl;
|
|
|
632 *ll = NULL;
|
|
|
633
|
|
|
634 } else {
|
|
|
635 p->in = NULL;
|
|
|
636 p->last_in = &p->in;
|
|
|
637 }
|
|
|
638
|
|
|
639 } else {
|
|
|
640 p->in = NULL;
|
|
|
641 p->last_in = &p->in;
|
|
|
642 }
|
|
|
643
|
|
|
644 if (ngx_write_chain_to_temp_file(p->temp_file, out) == NGX_ERROR) {
|
|
|
645 return NGX_ABORT;
|
|
|
646 }
|
|
|
647
|
|
|
648 for (last_free = &p->free_raw_bufs;
|
|
|
649 *last_free != NULL;
|
|
|
650 last_free = &(*last_free)->next)
|
|
|
651 {
|
|
|
652 /* void */
|
|
|
653 }
|
|
|
654
|
|
|
655 if (p->buf_to_file) {
|
|
|
656 p->temp_file->offset = p->buf_to_file->last - p->buf_to_file->pos;
|
|
|
657 p->buf_to_file = NULL;
|
|
|
658 out = out->next;
|
|
|
659 }
|
|
|
660
|
|
|
661 for (cl = out; cl; cl = next) {
|
|
|
662 next = cl->next;
|
|
|
663 cl->next = NULL;
|
|
|
664
|
|
|
665 b = cl->buf;
|
|
|
666 b->file = &p->temp_file->file;
|
|
|
667 b->file_pos = p->temp_file->offset;
|
|
|
668 p->temp_file->offset += b->last - b->pos;
|
|
|
669 b->file_last = p->temp_file->offset;
|
|
|
670
|
|
|
671 b->in_file = 1;
|
|
|
672 b->temp_file = 1;
|
|
|
673
|
|
50
|
674 if (p->out) {
|
|
|
675 *p->last_out = cl;
|
|
|
676 } else {
|
|
|
677 p->out = cl;
|
|
|
678 }
|
|
|
679 p->last_out = &cl->next;
|
|
0
|
680
|
|
|
681 if (b->last_shadow) {
|
|
32
|
682
|
|
50
|
683 tl = ngx_alloc_chain_link(p->pool);
|
|
|
684 if (tl == NULL) {
|
|
32
|
685 return NGX_ABORT;
|
|
|
686 }
|
|
|
687
|
|
|
688 tl->buf = b->shadow;
|
|
|
689 tl->next = NULL;
|
|
|
690
|
|
|
691 *last_free = tl;
|
|
|
692 last_free = &tl->next;
|
|
|
693
|
|
2
|
694 b->shadow->pos = b->shadow->start;
|
|
|
695 b->shadow->last = b->shadow->start;
|
|
|
696
|
|
32
|
697 ngx_event_pipe_remove_shadow_links(b->shadow);
|
|
0
|
698 }
|
|
|
699 }
|
|
|
700
|
|
|
701 return NGX_OK;
|
|
|
702 }
|
|
|
703
|
|
|
704
|
|
|
705 /* the copy input filter */
|
|
|
706
|
|
|
707 ngx_int_t ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
|
|
|
708 {
|
|
|
709 ngx_buf_t *b;
|
|
|
710 ngx_chain_t *cl;
|
|
|
711
|
|
|
712 if (buf->pos == buf->last) {
|
|
|
713 return NGX_OK;
|
|
|
714 }
|
|
|
715
|
|
|
716 if (p->free) {
|
|
56
|
717 cl = p->free;
|
|
|
718 b = cl->buf;
|
|
|
719 p->free = cl->next;
|
|
|
720 ngx_free_chain(p->pool, cl);
|
|
0
|
721
|
|
|
722 } else {
|
|
50
|
723 b = ngx_alloc_buf(p->pool);
|
|
|
724 if (b == NULL) {
|
|
0
|
725 return NGX_ERROR;
|
|
|
726 }
|
|
|
727 }
|
|
|
728
|
|
|
729 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
|
|
|
730 b->shadow = buf;
|
|
|
731 b->tag = p->tag;
|
|
|
732 b->last_shadow = 1;
|
|
|
733 b->recycled = 1;
|
|
|
734 buf->shadow = b;
|
|
|
735
|
|
50
|
736 cl = ngx_alloc_chain_link(p->pool);
|
|
|
737 if (cl == NULL) {
|
|
32
|
738 return NGX_ERROR;
|
|
|
739 }
|
|
|
740
|
|
|
741 cl->buf = b;
|
|
|
742 cl->next = NULL;
|
|
0
|
743
|
|
28
|
744 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "input buf #%d", b->num);
|
|
0
|
745
|
|
50
|
746 if (p->in) {
|
|
|
747 *p->last_in = cl;
|
|
|
748 } else {
|
|
|
749 p->in = cl;
|
|
|
750 }
|
|
|
751 p->last_in = &cl->next;
|
|
0
|
752
|
|
|
753 return NGX_OK;
|
|
|
754 }
|
|
|
755
|
|
|
756
|
|
16
|
757 static ngx_inline void ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf)
|
|
0
|
758 {
|
|
|
759 ngx_buf_t *b, *next;
|
|
|
760
|
|
2
|
761 b = buf->shadow;
|
|
|
762
|
|
|
763 if (b == NULL) {
|
|
0
|
764 return;
|
|
|
765 }
|
|
|
766
|
|
|
767 while (!b->last_shadow) {
|
|
|
768 next = b->shadow;
|
|
|
769
|
|
2
|
770 b->temporary = 0;
|
|
|
771 b->recycled = 0;
|
|
0
|
772
|
|
|
773 b->shadow = NULL;
|
|
|
774 b = next;
|
|
|
775 }
|
|
|
776
|
|
2
|
777 b->temporary = 0;
|
|
|
778 b->recycled = 0;
|
|
0
|
779 b->last_shadow = 0;
|
|
|
780
|
|
|
781 b->shadow = NULL;
|
|
|
782
|
|
|
783 buf->shadow = NULL;
|
|
|
784 }
|
|
|
785
|
|
|
786
|
|
16
|
787 static ngx_inline void ngx_event_pipe_free_shadow_raw_buf(ngx_chain_t **free,
|
|
0
|
788 ngx_buf_t *buf)
|
|
|
789 {
|
|
|
790 ngx_buf_t *s;
|
|
|
791 ngx_chain_t *cl, **ll;
|
|
|
792
|
|
|
793 if (buf->shadow == NULL) {
|
|
|
794 return;
|
|
|
795 }
|
|
|
796
|
|
|
797 for (s = buf->shadow; !s->last_shadow; s = s->shadow) { /* void */ }
|
|
|
798
|
|
|
799 ll = free;
|
|
|
800
|
|
|
801 for (cl = *free ; cl; cl = cl->next) {
|
|
|
802 if (cl->buf == s) {
|
|
|
803 *ll = cl->next;
|
|
|
804 break;
|
|
|
805 }
|
|
|
806
|
|
|
807 if (cl->buf->shadow) {
|
|
|
808 break;
|
|
|
809 }
|
|
|
810
|
|
|
811 ll = &cl->next;
|
|
|
812 }
|
|
|
813 }
|
|
|
814
|
|
|
815
|
|
32
|
816 ngx_int_t ngx_event_pipe_add_free_buf(ngx_event_pipe_t *p, ngx_buf_t *b)
|
|
0
|
817 {
|
|
32
|
818 ngx_chain_t *cl;
|
|
|
819
|
|
50
|
820 cl = ngx_alloc_chain_link(p->pool);
|
|
|
821 if (cl == NULL) {
|
|
32
|
822 return NGX_ERROR;
|
|
0
|
823 }
|
|
|
824
|
|
32
|
825 b->pos = b->start;
|
|
|
826 b->last = b->start;
|
|
|
827 b->shadow = NULL;
|
|
|
828
|
|
|
829 cl->buf = b;
|
|
|
830
|
|
|
831 if (p->free_raw_bufs == NULL) {
|
|
|
832 p->free_raw_bufs = cl;
|
|
|
833 cl->next = NULL;
|
|
|
834
|
|
|
835 return NGX_OK;
|
|
|
836 }
|
|
|
837
|
|
|
838 if (p->free_raw_bufs->buf->pos == p->free_raw_bufs->buf->last) {
|
|
0
|
839
|
|
32
|
840 /* add the free buf to the list start */
|
|
|
841
|
|
|
842 cl->next = p->free_raw_bufs;
|
|
|
843 p->free_raw_bufs = cl;
|
|
|
844
|
|
|
845 return NGX_OK;
|
|
0
|
846 }
|
|
32
|
847
|
|
|
848 /* the first free buf is partialy filled, thus add the free buf after it */
|
|
|
849
|
|
|
850 cl->next = p->free_raw_bufs->next;
|
|
|
851 p->free_raw_bufs->next = cl;
|
|
|
852
|
|
|
853 return NGX_OK;
|
|
0
|
854 }
|
|
|
855
|
|
|
856
|
|
|
857 static ngx_int_t ngx_event_pipe_drain_chains(ngx_event_pipe_t *p)
|
|
|
858 {
|
|
|
859 ngx_chain_t *cl, *tl;
|
|
|
860
|
|
|
861 for ( ;; ) {
|
|
|
862 if (p->busy) {
|
|
|
863 cl = p->busy;
|
|
|
864 p->busy = NULL;
|
|
|
865
|
|
|
866 } else if (p->out) {
|
|
|
867 cl = p->out;
|
|
|
868 p->out = NULL;
|
|
|
869
|
|
|
870 } else if (p->in) {
|
|
|
871 cl = p->in;
|
|
|
872 p->in = NULL;
|
|
|
873
|
|
|
874 } else {
|
|
|
875 return NGX_OK;
|
|
|
876 }
|
|
|
877
|
|
|
878 while (cl) {
|
|
|
879 if (cl->buf->last_shadow) {
|
|
32
|
880 if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) {
|
|
28
|
881 return NGX_ABORT;
|
|
|
882 }
|
|
|
883
|
|
0
|
884 cl->buf->last_shadow = 0;
|
|
|
885 }
|
|
|
886
|
|
|
887 cl->buf->shadow = NULL;
|
|
|
888 tl = cl->next;
|
|
|
889 cl->next = p->free;
|
|
|
890 p->free = cl;
|
|
|
891 cl = tl;
|
|
|
892 }
|
|
|
893 }
|
|
|
894 }
|
