1 | #| |
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2 | Copyright (c) 2006 Risto Laakso |
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3 | All rights reserved. |
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4 | |
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5 | Redistribution and use in source and binary forms, with or without |
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6 | modification, are permitted provided that the following conditions |
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7 | are met: |
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8 | 1. Redistributions of source code must retain the above copyright |
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9 | notice, this list of conditions and the following disclaimer. |
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10 | 2. Redistributions in binary form must reproduce the above copyright |
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11 | notice, this list of conditions and the following disclaimer in the |
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12 | documentation and/or other materials provided with the distribution. |
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13 | 3. The name of the author may not be used to endorse or promote products |
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14 | derived from this software without specific prior written permission. |
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15 | |
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16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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17 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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18 | OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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19 | IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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20 | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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21 | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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22 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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23 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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24 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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25 | THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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26 | |# |
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27 | (in-package :nio) |
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28 | |
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29 | (declaim (optimize (debug 3) (speed 3) (space 0))) |
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30 | |
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31 | ;;; FFI |
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32 | |
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33 | (defconstant +cmd-get-flags+ 3) |
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34 | (defconstant +cmd-set-flags+ 4) |
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35 | (defconstant +arg-nonblock+ #x0004) |
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36 | |
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37 | (defcfun ("close" %close) :int |
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38 | (fd :int)) |
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39 | |
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40 | (defcfun ("fcntl" %fcntl) :int |
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41 | (fd :int) |
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42 | (cmd :int) |
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43 | (arg :int)) |
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44 | |
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45 | (defcfun ("read" %read) :long |
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46 | (fd :int) |
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47 | (buffer :pointer) |
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48 | (nbytes :unsigned-long)) |
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49 | |
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50 | (defcfun ("write" %write) :long |
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51 | (fd :int) |
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52 | (buffer :pointer) |
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53 | (nbytes :unsigned-long)) |
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54 | |
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55 | (defcfun ("memset" %memset) :pointer |
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56 | (buffer :pointer) |
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57 | (byte :int) |
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58 | (len :int)) |
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59 | |
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60 | |
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61 | ;;; CLASSES |
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62 | |
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63 | (defclass async-fd () |
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64 | ((write-fd :initarg :write-fd) |
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65 | (write-queue :initform nil) |
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66 | |
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67 | (read-fd :initarg :read-fd) |
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68 | |
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69 | (foreign-read-buffer :initform (foreign-alloc :uint8 :count 4096)) |
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70 | (foreign-read-buffer-size :initform 4096) |
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71 | |
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72 | (lisp-read-buffer :initform (make-uint8-seq 1024)) |
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73 | (lisp-read-buffer-write-ptr :initform 0) |
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74 | |
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75 | (close-pending :initform nil) |
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76 | |
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77 | (accept-filter :initform nil) |
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78 | (read-callback :initform nil) |
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79 | )) |
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80 | |
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81 | |
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82 | (defmethod print-object ((async-fd async-fd) stream) |
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83 | (with-slots (read-fd write-fd write-queue) async-fd |
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84 | (format stream "#<ASYNC-FD r/w fd: ~D/~D, write queue length: ~D.>" |
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85 | read-fd write-fd (length write-queue)))) |
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86 | |
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87 | |
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88 | (defclass packet () |
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89 | ((buffer :initarg :buffer :initform nil :documentation "Foreign array") |
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90 | (size :initarg :size :initform 0) |
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91 | (written :initarg :written :initform 0))) |
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92 | |
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93 | |
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94 | ;;; FUNCTIONS |
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95 | |
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96 | |
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97 | (defun memzero (ptr size) |
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98 | (%memset ptr 0 size)) |
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99 | |
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100 | |
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101 | (defun set-fd-nonblocking (unix-fd) |
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102 | "Set UNIX-FD to non-blocking mode (O_NONBLOCK)." |
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103 | (%fcntl unix-fd +cmd-set-flags+ +arg-nonblock+)) |
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104 | |
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105 | |
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106 | (defun close-fd (unix-fd) |
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107 | "Close UNIX-FD." |
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108 | (%close unix-fd)) |
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109 | |
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110 | |
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111 | (defun make-uint8-seq (size) |
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112 | "Make uint8 sequence." |
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113 | (make-sequence '(vector (unsigned-byte 8)) size :initial-element 0)) |
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114 | |
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115 | |
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116 | (defun map-to-foreign (seq start end) |
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117 | "Map SEQ to foreign array." |
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118 | (let* ((len (- end start)) |
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119 | (foreign-array (foreign-alloc :uint8 :count len))) |
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120 | |
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121 | (loop for i from 0 below len do |
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122 | (setf (mem-aref foreign-array :uint8 i) (aref seq (+ start i)))) |
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123 | |
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124 | foreign-array)) |
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125 | |
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126 | |
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127 | (defun ensure-lisp-read-buffer-size (async-fd size) |
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128 | "Ensure that ASYNC-FD's LISP-READ-BUFFER is at least SIZE big." |
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129 | (with-slots (lisp-read-buffer lisp-read-buffer-write-ptr) async-fd |
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130 | |
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131 | (assert (and (not (null lisp-read-buffer)) (integerp lisp-read-buffer-write-ptr))) |
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132 | |
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133 | (unless (>= (length lisp-read-buffer) size) |
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134 | |
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135 | (let ((new-buf (make-uint8-seq (truncate (* 1.5 size))))) |
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136 | |
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137 | ;; copy old |
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138 | (loop for i from 0 below lisp-read-buffer-write-ptr do |
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139 | (setf (aref new-buf i) (aref lisp-read-buffer i))) |
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140 | |
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141 | (setf lisp-read-buffer new-buf) |
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142 | t)))) |
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143 | |
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144 | |
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145 | (define-condition read-error (error) ()) |
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146 | |
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147 | (defun read-more (async-fd) |
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148 | "Read more data from ASYNC-FD." |
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149 | (with-slots (foreign-read-buffer foreign-read-buffer-size) async-fd |
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150 | (with-slots (read-fd lisp-read-buffer lisp-read-buffer-write-ptr) async-fd |
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151 | |
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152 | (let ((new-bytes (%read read-fd foreign-read-buffer foreign-read-buffer-size))) |
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153 | |
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154 | (cond |
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155 | ((< new-bytes 0) |
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156 | (error 'read-error)) |
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157 | |
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158 | ((= new-bytes 0) |
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159 | nil);;(throw 'end-of-file nil)) |
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160 | |
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161 | (t |
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162 | |
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163 | (ensure-lisp-read-buffer-size async-fd (+ lisp-read-buffer-write-ptr new-bytes)) |
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164 | |
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165 | ;; copy data from foreign buffer to input-buffer |
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166 | (loop for i from 0 below new-bytes do |
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167 | (setf (aref lisp-read-buffer (+ i lisp-read-buffer-write-ptr)) |
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168 | (mem-aref foreign-read-buffer :uint8 i))) |
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169 | (incf lisp-read-buffer-write-ptr new-bytes) |
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170 | |
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171 | ;; call callback |
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172 | (with-slots (accept-filter read-callback) async-fd |
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173 | (if accept-filter |
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174 | (if (funcall accept-filter lisp-read-buffer lisp-read-buffer-write-ptr) |
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175 | (funcall read-callback async-fd (subseq lisp-read-buffer 0 lisp-read-buffer-write-ptr))) |
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176 | (funcall read-callback async-fd (subseq lisp-read-buffer 0 lisp-read-buffer-write-ptr)))) |
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177 | |
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178 | (values lisp-read-buffer lisp-read-buffer-write-ptr new-bytes) |
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179 | )))))) |
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180 | |
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181 | |
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182 | (defun close-async-fd (async-fd) |
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183 | "Close ASYNC-FD's fd after everything has been written from write-queue." |
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184 | (with-slots (write-queue read-fd write-fd foreign-read-buffer) async-fd |
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185 | (cond |
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186 | |
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187 | ;; if write-queue is emtpy, close now |
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188 | ((null write-queue) |
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189 | (close-fd read-fd) |
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190 | (foreign-free foreign-read-buffer) |
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191 | (unless (= read-fd write-fd) (close-fd write-fd))) |
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192 | |
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193 | ;; data in write-queue, mark as closing |
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194 | (t |
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195 | (setf (slot-value async-fd 'close-pending) t))))) |
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196 | |
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197 | |
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198 | (defun write-more (async-fd) |
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199 | "Write data from ASYNC-FD's write-queue." |
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200 | (with-slots (write-fd write-queue) async-fd |
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201 | |
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202 | ;; loop for packets in queue |
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203 | (loop for packet in write-queue do |
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204 | |
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205 | (with-slots (buffer size written) packet |
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206 | |
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207 | (assert (and (pointerp buffer) (integerp size) (integerp written))) |
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208 | |
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209 | ;; write data from entry to socket |
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210 | (let ((now-written (%write write-fd (inc-pointer buffer written) (- size written)))) |
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211 | ;; update count |
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212 | (setf written (+ written now-written)) |
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213 | ;; unless could write fully, return |
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214 | (unless (= written size) |
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215 | (return))))) |
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216 | |
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217 | ;; remove (and dealloc buffers) of entries that have been fully written |
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218 | (let ((unfinished-entries NIL)) |
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219 | (setf write-queue |
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220 | (nreverse |
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221 | (dolist (entry write-queue unfinished-entries) |
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222 | (with-slots (size written) entry |
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223 | (if (= size written) |
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224 | (with-slots (buffer) entry |
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225 | (foreign-free buffer)) |
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226 | (push entry unfinished-entries))))))) |
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227 | |
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228 | ;; if queue empty and close pending, close fd |
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229 | (if (and (null write-queue) (slot-value async-fd 'close-pending)) |
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230 | (close-async-fd async-fd)) |
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231 | |
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232 | t)) |
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233 | |
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234 | |
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235 | (defun async-write-seq (async-fd seq &optional (start 0) (end (length seq))) |
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236 | "Queue from SEQ between START and END to write-queue." |
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237 | |
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238 | (assert (and (numberp start) (not (null seq)))) |
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239 | |
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240 | ;; enqueue sequence |
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241 | (with-slots (write-queue) async-fd |
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242 | (let ((entry (make-instance 'packet :buffer (map-to-foreign seq start end) :size (- end start)))) |
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243 | (setf write-queue (append write-queue (list entry))))) |
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244 | |
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245 | ;; start writing |
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246 | (write-more async-fd)) |
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247 | |
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248 | |
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249 | |
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250 | |
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251 | |
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252 | (defun force-close-async-fd (async-fd) |
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253 | "Drop ASYNC-FD's write-queue and close it." |
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254 | (setf (slot-value async-fd 'write-queue) nil) |
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255 | (close-async-fd async-fd)) |
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256 | |
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257 | |
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258 | (defun add-async-fd (event-queue async-fd mode) |
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259 | (ecase mode |
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260 | (:read (add-fd event-queue (slot-value async-fd 'read-fd) :read)) |
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261 | (:write (add-fd event-queue (slot-value async-fd 'write-fd) :write)))) |
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262 | |
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263 | |
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264 | (defun remove-async-fd (event-queue async-fd mode) |
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265 | (ecase mode |
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266 | (:read (remove-fd event-queue (slot-value async-fd 'read-fd) :read)) |
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267 | (:write (remove-fd event-queue (slot-value async-fd 'write-fd) :write)))) |
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268 | |
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269 | |
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270 | (defun async-fd-read-fd (async-fd) |
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271 | (slot-value async-fd 'read-fd)) |
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272 | |
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273 | (defun async-fd-write-fd (async-fd) |
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274 | (slot-value async-fd 'write-fd)) |
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275 | |
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276 | (defun set-accept-filter (async-fd accept-filter) |
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277 | (setf (slot-value async-fd 'accept-filter) accept-filter)) |
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278 | |
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279 | (defun set-read-callback (async-fd read-callback) |
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280 | (setf (slot-value async-fd 'read-callback) read-callback)) |
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