Mercurial > hg > nginx
annotate src/os/win32/ngx_wsarecv_chain.c @ 9086:f68fdb017141 quic
QUIC: optimized sending stream response.
When a stream is created by client, it's often the case that nginx will send
immediate response on that stream. An example is HTTP/3 request stream, which
in most cases quickly replies with at least HTTP headers.
QUIC stream init handlers are called from a posted event. Output QUIC
frames are also sent to client from a posted event, called the push event.
If the push event is posted before the stream init event, then output produced
by stream may trigger sending an extra UDP datagram. To address this, push
event is now re-posted when a new stream init event is posted.
An example is handling 0-RTT packets. Client typically sends an init packet
coalesced with a 0-RTT packet. Previously, nginx replied with a padded CRYPTO
datagram, followed by a 1-RTT stream reply datagram. Now CRYPTO and STREAM
packets are coalesced in one reply datagram, which saves bandwidth.
Other examples include coalescing 1-RTT first stream response, and
MAX_STREAMS/STREAM sent in response to ACK/STREAM.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Mon, 03 Apr 2023 16:17:12 +0400 |
parents | 56819a9491fe |
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rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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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_event.h> |
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11 |
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13 #define NGX_WSABUFS 64 |
501 | 14 |
15 | |
16 ssize_t | |
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17 ngx_wsarecv_chain(ngx_connection_t *c, ngx_chain_t *chain, off_t limit) |
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18 { |
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19 int rc; |
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20 u_char *prev; |
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21 u_long bytes, flags; |
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22 size_t n, size; |
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23 ngx_err_t err; |
501 | 24 ngx_array_t vec; |
186
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25 ngx_event_t *rev; |
501 | 26 LPWSABUF wsabuf; |
27 WSABUF wsabufs[NGX_WSABUFS]; | |
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28 |
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29 prev = NULL; |
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30 wsabuf = NULL; |
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31 flags = 0; |
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32 size = 0; |
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33 bytes = 0; |
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34 |
501 | 35 vec.elts = wsabufs; |
36 vec.nelts = 0; | |
37 vec.size = sizeof(WSABUF); | |
577 | 38 vec.nalloc = NGX_WSABUFS; |
501 | 39 vec.pool = c->pool; |
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40 |
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41 /* coalesce the neighbouring bufs */ |
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42 |
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43 while (chain) { |
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44 n = chain->buf->end - chain->buf->last; |
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45 |
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46 if (limit) { |
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47 if (size >= (size_t) limit) { |
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48 break; |
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49 } |
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50 |
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51 if (size + n > (size_t) limit) { |
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52 n = (size_t) limit - size; |
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53 } |
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54 } |
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55 |
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56 if (prev == chain->buf->last) { |
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57 wsabuf->len += n; |
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58 |
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59 } else { |
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60 if (vec.nelts == vec.nalloc) { |
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61 break; |
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62 } |
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63 |
501 | 64 wsabuf = ngx_array_push(&vec); |
65 if (wsabuf == NULL) { | |
66 return NGX_ERROR; | |
67 } | |
68 | |
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69 wsabuf->buf = (char *) chain->buf->last; |
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70 wsabuf->len = n; |
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71 } |
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72 |
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73 size += n; |
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74 prev = chain->buf->end; |
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75 chain = chain->next; |
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76 } |
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77 |
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78 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 79 "WSARecv: %d:%d", vec.nelts, wsabuf->len); |
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80 |
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81 |
501 | 82 rc = WSARecv(c->fd, vec.elts, vec.nelts, &bytes, &flags, NULL, NULL); |
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83 |
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84 rev = c->read; |
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85 |
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86 if (rc == -1) { |
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87 rev->ready = 0; |
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88 err = ngx_socket_errno; |
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89 |
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90 if (err == WSAEWOULDBLOCK) { |
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91 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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92 "WSARecv() not ready"); |
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93 return NGX_AGAIN; |
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94 } |
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95 |
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96 rev->error = 1; |
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97 ngx_connection_error(c, err, "WSARecv() failed"); |
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98 return NGX_ERROR; |
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99 } |
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100 |
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101 #if (NGX_HAVE_FIONREAD) |
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102 |
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103 if (rev->available >= 0 && bytes > 0) { |
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104 rev->available -= bytes; |
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105 |
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106 /* |
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107 * negative rev->available means some additional bytes |
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108 * were received between kernel notification and WSARecv(), |
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109 * and therefore ev->ready can be safely reset even for |
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110 * edge-triggered event methods |
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111 */ |
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112 |
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113 if (rev->available < 0) { |
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114 rev->available = 0; |
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115 rev->ready = 0; |
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116 } |
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117 |
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118 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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119 "WSARecv: avail:%d", rev->available); |
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120 |
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121 } else if (bytes == size) { |
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122 |
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123 if (ngx_socket_nread(c->fd, &rev->available) == -1) { |
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124 rev->ready = 0; |
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125 rev->error = 1; |
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126 ngx_connection_error(c, ngx_socket_errno, |
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127 ngx_socket_nread_n " failed"); |
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128 return NGX_ERROR; |
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129 } |
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130 |
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131 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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132 "WSARecv: avail:%d", rev->available); |
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133 } |
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134 |
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135 #endif |
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136 |
186
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137 if (bytes < size) { |
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138 rev->ready = 0; |
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139 } |
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140 |
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141 if (bytes == 0) { |
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142 rev->ready = 0; |
186
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143 rev->eof = 1; |
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144 } |
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145 |
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146 return bytes; |
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147 } |