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1
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2 Moonbridge reference
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3 ====================
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4
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5
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6
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7 Global function listen{...}
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8 ---------------------------
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9
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10 This function initializes the Moonbridge Network Server. It may be called
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11 multiple times. However, it is not allowed to register additional listeners by
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12 calling listen(...) from a "prepare", "connect", or "finish" handler.
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13
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14 See file "example.lua" for parametrization of the listen(...) function.
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15
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16 Warning: Moonbridge will fork the Lua environment to handle parallel requests.
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17 Functions provided as "prepare", "connect", and "finish" handlers may access
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18 global variables, but for every child process these global variables will not
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19 be shared! If you require a global state, a DBMS, cache server, or similar is
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20 necessary.
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21
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22
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23
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24 Global function timeout(...)
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25 ----------------------------
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26
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27 Calling this function with a positive number (time in seconds) sets a timer
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28 that kills the current process after the selected time runs out. The remaining
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29 time can be queried by calling this function without arguments.
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30
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31 Calling this function with a single argument that is the number zero will
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32 disable the timeout.
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33
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34 Another mode of operation is selected by passing two arguments: a time (in
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35 seconds) as first argument and a function as second argument. In this case, a
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36 sub-timer will be used to limit the execution time of the function. In case of
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37 timeout, the process will be killed (and the timeout function does not return).
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38 If the time for the sub-timer is longer than a previously set timeout (using
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39 the timeout(...) function with one argument), the shorter timeout (of the
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40 previous call of timeout(...)) will have precedence.
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41
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42 Timers are also automatically reset (disabled) when a handler (prepare handler
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43 or connect handler) returns. To shutdown processes after a certain time waiting
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44 for a new request, use the idle_time parameter of the listen function.
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45
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46
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47
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48 Socket object passed to "connect" handler
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49 -----------------------------------------
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50
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51 For every incoming connection, the registered "connect" handler is called with
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52 a single socket object as argument, which is described below:
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53
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54
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55 ### socket:cancel()
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56
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57 Closes the socket connection by sending a TCP RST package if possible to
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58 indicate error condition. Returns true on success, or nil plus error message in
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59 case of an I/O error. Using this method on sockets that have already been
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60 closed (or canceled) will throw an error.
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61
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62 Warning: Previously sent (and flushed) data may be lost during transmission.
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63
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64
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65 ### socket:close(timeout)
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66
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67 Closes the socket connection (input and output stream) by flushing all data and
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68 sending a TCP FIN package. Returns true on success, or nil plus error message
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69 in case of an I/O error. Using this method on sockets that have already been
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70 closed (or canceled) will throw an error.
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71
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72 Warning: Pending data on the input stream may cause connection aborts (TCP RST)
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73 depending on the particular operating system used. All pending input data
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74 should have been read before calling socket:close().
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75
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76 The optional timeout parameter may be used to wait until all data has been sent
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77 out, or until the timeout elapses (in which case a TCP RST is sent) whichever
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78 happens first. A timeout value of 0 or nil causes immediate return and sending
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79 of pending data in background (recommended).
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80
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81
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82 ### socket:flush()
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83
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84 Alias for socket.output:flush()
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85
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86
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87 ### socket.input
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88
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89 Lua file handle representing the input stream of the socket connection.
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90 Supports the same methods as io.open()'s return values.
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91
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92
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93 ### socket.interval
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94
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95 Set to the name of an interval timer if the "connect" handler was called due to
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96 an elapsed interval timer. Otherwise nil.
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97
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98
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99 ### socket:lines()
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100
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101 Alias for socket.input:lines()
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102
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103
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104 ### socket.local_ip4
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105
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106 Local IPv4 address used for the connection. Encoded as 4 raw bytes in form of a
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107 string.
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108
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109
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110 ### socket.local_ip6
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111
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112 Local IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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113 a string.
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114
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115
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116 ### socket.local_tcpport
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117
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118 Local TCP port used for the connection.
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119
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120
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121 ### socket.output
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122
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123 Lua file handle representing the output stream of the socket connection.
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124 Supports the same methods as io.open()'s return values.
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125
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126
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127 ### socket:read(...)
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128
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129 Alias for socket.input:read()
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130
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131
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132 ### socket:readuntil(terminator, maxlen)
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133
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134 Reads as many bytes until a byte equal to the terminator value occurs. An
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135 optional maximum length may be specified. The terminating byte is included in
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136 the return value (unless the maximum length would be exceeded). On EOF, nil is
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137 returned. In case of an I/O error, nil (as first result value) plus an error
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138 message (as second result value) is returned.
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139
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140 This method is also available as :readuntil(...) for any other Lua file handle
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141 (including socket.input).
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142
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143
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144 ### socket.remote_ip4
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145
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146 Remote IPv4 address used for the connection. Encoded as 4 raw bytes in form of
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147 a string.
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148
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149
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150 ### socket.remote_ip6
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151
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152 Remote IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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153 a string.
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154
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155
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156 ### socket.remote_tcpport
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157
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158 Remote TCP port used for the connection.
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159
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160
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161 ### socket:write(...)
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162
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163 Alias for socket.output:write(...)
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164
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165
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166
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167 HTTP module
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168 -----------
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169
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170 The http module exports the function http.generate_handler(callback) that
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171 converts an HTTP handler to a "connect" handler. See file "example.lua" for an
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172 example of invocation. A table with options may be passed either as a second
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173 argument, or as a first argument preceeding the callback function (whichever is
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174 more convenient).
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175
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176 The following options are supported:
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177
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178 - request_body_size_limit: maximum size of payload of HTTP request body
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179 (transfer encoding is allowed to add a limited amount of extra data)
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180 - chunk_size: optional default value for maximum_input_chunk_size and
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181 minimum_output_chunk_size
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182 - request_header_size_limit: maximum size of HTTP request headers
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183 - maximum_input_chunk_size: maximum chunk size when streaming a request body or
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184 certain POST fields (bigger chunks will be fragmented automatically)
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185 - minimum_output_chunk_size: minimum size for a chunk when sending a response
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186 body (smaller chunks will be buffered and concatenated with future data;
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187 ignored when request:flush() is called)
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188 - static_headers: a set of headers to be included in every HTTP response
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189 (may be a string, a table or strings, or a table of key-value pairs)
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190
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191 The callback function receives a single request object as argument, which is
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192 described below.
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193
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194
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195 ### request.body
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196
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197 The request body (without headers) as a string. Accessing this value makes
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198 further access to request.post_params and request.post_params_list, or
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199 invocation of request:stream_request_body(...) impossible.
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200
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201
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202 ### request:close_after_finish()
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203
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204 Closes the connection after answering the request.
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205
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206 This method can only be called before the HTTP response header section has been
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207 finished (i.e. before request:finish_headers(), request:send_data(...), or
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208 request:finish() were called), but it may be called before a status code has
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209 been sent using request:send_status(...).
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210
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211 A corresponding "Connection: close" header is automatically sent.
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212
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213
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214 ### request.cookies
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215
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216 A table with all cookies sent by the client.
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217
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218
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219 ### request.defer_reading()
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220
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221 Disables automatic request body processing on write. Can be called before
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222 sending a HTTP status code to send a response before the request has been fully
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223 received.
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224
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225 CAUTION: Responding to a request before the request body has been processed may
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226 lead to a deadlock if the browser does not process the response while trying to
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227 send the request. Therefore, this function should only be used if:
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228
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229 - the TCP stack has enough buffer space for the response (i.e. if the response
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230 is small enough), and if
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231 - a timer is used to cancel the response in case of a deadlock.
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232
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233 It is recommended to not use this function unless certain performance tweaks
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234 are desired.
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235
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236
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237 ### request.faulty
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238
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239 Normally set to false. In case of a read or write error on the client
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240 connection, this value is set to true before a Lua error is raised.
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241
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242 A faulty request handle must not be used, or another Lua error will be raised.
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243
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244
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245 ### request:finish()
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246
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247 Finishes and flushes a HTTP response. May be called multiple times. An
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248 HTTP status, all headers, and the response body (if applicable) must have been
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249 previously sent. After calling this method, no further data may be written.
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250
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251
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252 ### request:finish_headers()
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253
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254 Finishes and flushes the HTTP response header section. May be called multiple
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255 times, as long as the request is not finished completely. This method is
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256 automatically invoked if the application is beginning to send a response body.
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257 After calling this method, no further headers may be sent.
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258
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259
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260 ### request:flush()
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261
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262 Flushes any pending output data. Note: In order to mark the end of a response
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263 body, it is required to call request:finish().
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264
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265
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266 ### request.get_params
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267
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268 A table that maps field names to their corresponding GET value. If there are
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269 several GET values with the given field name, then the first value is used.
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270
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271 Note: May be implemented through metamethods, but does support iteration
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272 through pairs(...).
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273
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274
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275 ### request.get_params_list
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276
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277 A table that maps field names to a sequence of their corresponding GET values.
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278
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279 Note: May be implemented through metamethods, but does support iteration
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280 through pairs(...).
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281
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282
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283 ### request.headers
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284
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285 A table that maps (case-insensitively) a HTTP header field name to a sequence
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286 of values. One entry is created for every occurrence of a header line with the
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287 given field name).
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288
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289
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290 ### request.headers_csv_string
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291
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292 A table that maps (case-insensitively) a HTTP header field name to a comma
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293 separated string. Multiple occurrences of the header with the given field name
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294 are automatically merged into the comma separated string.
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295
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296
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297 ### request.headers_csv_table
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298
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299 A table that maps (case-insensitively) a HTTP header field name to a sequence
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300 of values. One entry is created for every comma separated value of each header
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301 with the given field name.
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302
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303
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304 ### request.headers_flags
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305
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306 A table that maps (case-insensitively) a HTTP header field name to another
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307 table which (again case-insensitively) maps a string to a boolean, depending on
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308 whether this string occurred in the list of comma separated values of one
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309 header line with the given field name that was the key in the first table.
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310
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311
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312 ### request.headers_value
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313
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314 A table that maps (case-insensitively) a HTTP header field name to a value. If
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315 multiple header lines with the given field name have been received, false is
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316 used as value.
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317
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318
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319 ### request.method
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320
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321 The HTTP request method, e.g. "HEAD", "GET", or "POST".
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322
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323
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324 ### request.path
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325
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326 The requested path without a leading slash and without the query part (e.g.
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327 "index.html" if "/index.html?a=b&c=d" has been requested). For the query part,
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328 see request.query.
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329
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330 This value will be nil if (and only if) the request method is "OPTIONS" with a
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331 request target equal to "*" (see also asterisk-form of request-target in
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332 section 5.3.4 in RFC 7230).
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333
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334
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335 ### request.post_metadata
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336
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337 Only set for multipart/form-data POST requests. A table that maps field names
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338 to their corresponding POST metadata table which contains two entries:
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339 "file_name" and "content_type". If there are several POST values with the given
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340 field name, then the first value/file is used.
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341
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342
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343 ### request.post_metadata_list
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344
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345 Only set for multipart/form-data POST requests. A table that maps field names
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346 to a sequence with their corresponding POST metadata tables. Needed if multiple
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347 files are uploaded with the same field name.
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348
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349
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350 ### request.post_params
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351
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352 A table that maps field names to their corresponding POST value. If there are
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353 several POST values with the given field name, then the first value is used.
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354
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355 Note: May be implemented through metamethods, but does support iteration
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356 through pairs(...).
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357
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358
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359 ### request.post_params_list
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360
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361 A table that maps field names to a sequence of their corresponding POST values.
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362
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363 Note: May be implemented through metamethods, but does support iteration
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364 through pairs(...).
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365
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366
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367 ### request.query
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368
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369 Query part of the request target including the leading question mark, e.g.
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370 "?a=b&c=d" if the requested target is "/index.html?a=b&c=d". The data is
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371 automatically parsed and made available through request.get_params and
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372 request.get_params_list.
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373
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374 If there is no query part given in the request target, then this string is
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375 the empty string. This value will be nil if (and only if) the request method
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376 is "OPTIONS" with a request target equal to "*" (see also asterisk-form of
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377 request-target in section 5.3.4 in RFC 7230).
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378
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379
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380 ### request:process_request_body()
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381
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382 Starts processing the request body (if existent) to set the values
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383 request.post_params, request.post_params_list, request.post_metadata, and
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384 and request.post_metadata_list and/or to call POST field stream handlers that
|
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385 have been previously registered with request:stream_post_param(...) or
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386 request:stream_post_params(...).
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387
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388 This method gets invoked automatically when the POST param tables
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389 (request.post_params, etc.) are accessed, or if a response is sent (to avoid
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390 deadlocks with the webbrowser). (Note: Automatic request body processing on
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391 write may be disabled by calling request:defer_reading().)
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392
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393 After this method returned, all registered POST field stream handlers have
|
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394 received all data. Registration of other POST field stream handlers is not
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395 possible after this method has been called (or after request.post_params_list
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396 or request.post_params have been accessed).
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397
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398
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399 ### request:send_data(...)
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400
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401 Sends data as response body. All arguments are converted via tostring(...) and
|
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402 concatenated. May be called multiple times until the request has been finished
|
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403 by calling request:finish().
|
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|
404
|
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405 If the request method (see request.method) is "HEAD", then calls to
|
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406 request:send_data(...) are automatically ignored.
|
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|
407
|
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|
408
|
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409 ### request:send_header(key, value)
|
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410
|
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411 Sends a HTTP response header that consists of the given key and the given
|
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412 value. Note: Key and value must be provided as separate arguments. Before any
|
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413 headers can be sent, a HTTP status must have been set with
|
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414 request:send_status(status_string).
|
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|
415
|
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|
416
|
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417 ### request:send_status(status_string)
|
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|
418
|
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419 Sends a HTTP response status that is given as a string consisting of a 3-digit
|
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420 number and an explanatory string, e.g. "200 OK" or "404 Not Found". This
|
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421 function must be called once before any headers or response body data may be
|
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|
422 sent.
|
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|
423
|
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|
424
|
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425 ### request.socket
|
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426
|
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427 The underlaying socket. Can be used to force a TCP RST, etc.
|
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|
428
|
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|
429
|
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430 ### request:stream_post_param(field_name, callback)
|
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|
431
|
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432 Registers a stream handler for the given POST parameter. The callback function
|
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|
433 will be called in the following manner:
|
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|
434
|
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435 - For the initial chunk, the first chunk gets passed as first argument while a
|
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|
436 table with metadata ("field_name" and "content_type") gets passed as second
|
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|
437 argument. In case of an immediate EOF (i.e. an empty file), the passed
|
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|
438 chunk is the empty string. In all other cases the chunk has a length greater
|
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|
439 than zero.
|
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|
440 - For any remaining chunks, the respective chunk gets passed as first and only
|
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|
441 argument (no metadata). Here, the chunk has always a length greater than
|
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|
442 zero.
|
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|
443 - To indicate the end of the stream, the callback function is called without
|
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|
444 arguments. This also happens in case of an immediate EOF (see above).
|
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|
445
|
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|
446 In case of an immediate EOF (i.e. an empty file), the callback function is thus
|
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|
447 called as follows:
|
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|
448
|
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|
449 - The first time with an empty string as first argument, and with the metadata
|
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|
450 as second argument.
|
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|
451 - The second time without any arguments.
|
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|
452
|
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|
453
|
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|
454 ### request:stream_post_params(pattern, callback)
|
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|
455
|
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|
456 Same as request:stream_post_param(...) but providing a string pattern to match
|
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|
457 multiple field names (e.g. "^file_[0-9]+$").
|
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|
458
|
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|
459
|
jbe@0
|
460 ### request:stream_request_body(callback)
|
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|
461
|
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|
462 Start streaming of request body. For each chunk of the request body, the
|
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|
463 callback function is called with the corresponding chunk. End of data is
|
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|
464 indicated through return of request:stream_request_body(...) (not by calling
|
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|
465 the callback without arguments).
|
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|
466
|
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|
467 The function may be called with nil instead of a callback function. In this
|
jbe@44
|
468 case, the request body is read and discarded. Only if nil is passed instead of
|
jbe@44
|
469 a callback, then the function may also be invoked when the request body has
|
jbe@44
|
470 already been read and/or processed. In the latter case, the function performs
|
jbe@44
|
471 no operation.
|
jbe@0
|
472
|
jbe@44
|
473
|