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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:close(timeout)
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56
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57 Closes the socket connection (input and output stream) by flushing all data and
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58 sending a TCP FIN packet. If the timeout value is non-nil but zero, a TCP RST
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59 is sent instead. If a positive timeout value is given and if the remote peer
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60 doesn't respond with a TCP FIN within the given time, a TCP RST is sent in
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61 addition to the previously sent TCP FIN packet. If the timeout value is nil or
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62 negative, the call returns immediately and the operating system will wait for
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63 the peer's TCP FIN packet.
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64
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65 Returns true on success, or nil plus error message in case of an I/O error.
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66 Using this method on sockets that have already been closed (or reset) will
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67 throw an error.
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68
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69 Warning: Pending data on the input stream may cause connection aborts (TCP RST)
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70 depending on the particular operating system used. All pending input data
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71 should have been read (or drained) before calling socket:close().
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72
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73
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74 ### socket:drain(maxlen, terminator)
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75
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76 Same as socket:read(maxlen, terminator), but discards the input and returns the
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77 number of discarded bytes. If no bytes could be read but EOF was encountered,
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78 then true is returned.
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79
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80 In case of an I/O error, nil (as first return value) plus an error message (as
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81 second result value) are returned.
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82
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83
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84 ### socket:drain_nb(maxlen, terminator)
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85
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86 Same as socket:read_nb(maxlen, terminator), but discards the input and returns
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87 the number of discarded bytes. If no bytes could be read but EOF was
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88 encountered, then true is returned.
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89
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90 In case of an I/O error, nil (as first return value) plus an error message (as
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91 second result value) are returned.
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92
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93
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94 ### socket:flush(...)
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95
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96 Same as socket:write(...) but additionally flushes the socket (i.e. all pending
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97 data is passed to the operating system).
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98
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99 In case of an I/O error, nil (as first return value) plus an error message (as
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100 second result value) are returned. On success, the socket userdata object is
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101 returned.
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102
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103
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104 ### socket:flush_nb(...)
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105
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106 Same as socket:write_nb(...) but additionally flushes the socket (i.e. all
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107 pending data is passed to the operating system). The total number of bytes that
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108 could not be passed yet to the operating system is returned. Zero is returned
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109 if all data could be flushed out.
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110
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111 In case of an I/O error, nil (as first return value) plus an error message (as
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112 second result value) are returned.
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113
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114
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115 ### socket.interval
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116
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117 Set to the name of an interval timer if the "connect" handler was called due to
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118 an elapsed interval timer. Otherwise nil.
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119
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120
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121 ### socket.local_ip4
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122
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123 Local IPv4 address used for the connection. Encoded as 4 raw bytes in form of a
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124 string.
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125
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126
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127 ### socket.local_ip6
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128
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129 Local IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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130 a string.
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131
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132
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133 ### socket.local_tcpport
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134
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135 Local TCP port used for the connection.
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136
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137
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138 ### socket:read(maxlen, terminator)
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139
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140 Read up to maxlen bytes or until an optional termination character is
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141 encountered (which is included in the result). The maxlen value may be nil, in
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142 which case there is no limit on the number of bytes read.
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143
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144 If EOF is encountered before any data could be read, then false (as first
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145 return value) plus a notice string (as second return value) are returned.
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146
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147 In case of an I/O error, nil (as first return value) plus an error message (as
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148 second result value) are returned.
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149
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150
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151 ### socket:read_nb(maxlen, terminator)
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152
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153 Read up to maxlen bytes, until an optional termination character is encountered
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154 (which is included in the result), or until no more data is available for
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155 reading. The maxlen value may be nil, in which case there is no limit on the
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156 number of bytes read.
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157
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158 If EOF is encountered before any data could be read, then false (as first
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159 return value) plus a notice string (as second return value) are returned.
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160
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161 If no data was available for reading, but no EOF was encountered, then an empty
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162 string is returned.
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163
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164 In case of an I/O error, nil (as first return value) plus an error message (as
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165 second result value) are returned.
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166
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167
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168 ### socket.remote_ip4
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169
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170 Remote IPv4 address used for the connection. Encoded as 4 raw bytes in form of
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171 a string.
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172
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173
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174 ### socket.remote_ip6
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175
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176 Remote IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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177 a string.
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178
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179
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180 ### socket.remote_tcpport
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181
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182 Remote TCP port used for the connection.
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183
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184
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185 ### socket:reset()
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186
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187 Alias for socket:close(0). Closes the socket connection by sending a TCP RST
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188 packet if possible to indicate error condition.
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189
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190 Returns true on success, or nil (as first result value) plus error message (as
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191 second result value) in case of an I/O error. Using this method on sockets that
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192 have already been closed (or reset) will throw an error.
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193
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194 Warning: Previously sent (and flushed) data may be lost during transmission.
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195
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196
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197 ### socket:write(...)
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198
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199 Takes a variable number of strings and sends them to the peer. The operation is
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200 buffered, so to actually send out the data, it is necessary to eventually call
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201 socket:flush(), socket:finish(), or socket:close().
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202
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203 In case of an I/O error, nil (as first return value) plus an error message (as
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204 second result value) are returned. On success, the socket userdata object is
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205 returned.
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206
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207
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208 ### socket:write_nb(...)
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209
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210 Takes a variable number of strings and sends them to the peer. The operation is
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211 buffered, so to actually send out the data, it is necessary to eventually call
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212 socket:flush_nb(), socket:flush(), socket:finish(), or socket:close().
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213
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214 This function always returns immediately (i.e. it does not block). If all data
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215 (but a small buffered portion) could be sent out, then zero is returned.
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216 Otherwise, all arguments that could not be sent are stored in a buffer of
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217 unlimited size (up to memory capabilities) and an integer is returned that
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218 indicates the number of bytes currently in the buffer.
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219
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220 In case of an I/O error, nil (as first return value) plus an error message (as
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221 second result value) are returned.
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222
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223
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224
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225 HTTP module
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226 -----------
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227
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228 The http module exports the function http.generate_handler(callback) that
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229 converts an HTTP handler to a "connect" handler. See file "example.lua" for an
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230 example of invocation. A table with options may be passed either as a second
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231 argument, or as a first argument preceeding the callback function (whichever is
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232 more convenient).
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233
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234 The following options are supported:
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235
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236 - request_body_size_limit: maximum size of payload of HTTP request body
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237 (transfer encoding is allowed to add a limited amount of extra data)
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238 - chunk_size: optional default value for maximum_input_chunk_size and
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239 minimum_output_chunk_size
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240 - request_header_size_limit: maximum size of HTTP request headers
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241 - maximum_input_chunk_size: maximum chunk size when streaming a request body or
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242 certain POST fields (bigger chunks will be fragmented automatically)
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243 - minimum_output_chunk_size: minimum size for a chunk when sending a response
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244 body (smaller chunks will be buffered and concatenated with future data;
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245 ignored when request:flush() is called)
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246 - static_headers: a set of headers to be included in every HTTP response
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247 (may be a string, a table or strings, or a table of key-value pairs)
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248
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249 The callback function receives a single request object as argument, which is
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250 described below.
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251
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252
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253 ### request.body
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254
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255 The request body (without headers) as a string. Accessing this value makes
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256 further access to request.post_params and request.post_params_list, or
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257 invocation of request:stream_request_body(...) impossible.
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258
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259
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jbe@60
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260 ### request:close_after_finish()
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261
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262 Closes the connection after answering the request.
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263
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264 This method can only be called before the HTTP response header section has been
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265 finished (i.e. before request:finish_headers(), request:send_data(...), or
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266 request:finish() were called), but it may be called before a status code has
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267 been sent using request:send_status(...).
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268
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269 A corresponding "Connection: close" header is automatically sent.
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270
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271
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272 ### request.cookies
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273
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274 A table with all cookies sent by the client.
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275
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276
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jbe@0
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277 ### request.defer_reading()
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278
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279 Disables automatic request body processing on write. Can be called before
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280 sending a HTTP status code to send a response before the request has been fully
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281 received.
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282
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283 CAUTION: Responding to a request before the request body has been processed may
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284 lead to a deadlock if the browser does not process the response while trying to
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285 send the request. Therefore, this function should only be used if:
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286
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287 - the TCP stack has enough buffer space for the response (i.e. if the response
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288 is small enough), and if
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289 - a timer is used to cancel the response in case of a deadlock.
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290
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291 It is recommended to not use this function unless certain performance tweaks
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292 are desired.
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293
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294
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295 ### request.faulty
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296
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297 Normally set to false. In case of a read or write error on the client
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298 connection, this value is set to true before a Lua error is raised.
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299
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300 A faulty request handle must not be used, or another Lua error will be raised.
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301
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302
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jbe@0
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303 ### request:finish()
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304
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305 Finishes and flushes a HTTP response. May be called multiple times. An
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306 HTTP status, all headers, and the response body (if applicable) must have been
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307 previously sent. After calling this method, no further data may be written.
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308
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309
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jbe@0
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310 ### request:finish_headers()
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311
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312 Finishes and flushes the HTTP response header section. May be called multiple
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313 times, as long as the request is not finished completely. This method is
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314 automatically invoked if the application is beginning to send a response body.
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315 After calling this method, no further headers may be sent.
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316
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jbe@0
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317
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jbe@0
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318 ### request:flush()
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jbe@0
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319
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jbe@0
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320 Flushes any pending output data. Note: In order to mark the end of a response
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321 body, it is required to call request:finish().
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jbe@0
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322
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jbe@0
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323
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jbe@0
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324 ### request.get_params
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325
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jbe@0
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326 A table that maps field names to their corresponding GET value. If there are
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327 several GET values with the given field name, then the first value is used.
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jbe@0
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328
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jbe@35
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329 Note: May be implemented through metamethods, but does support iteration
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jbe@35
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330 through pairs(...).
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jbe@35
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331
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jbe@0
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332
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jbe@0
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333 ### request.get_params_list
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jbe@0
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334
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jbe@0
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335 A table that maps field names to a sequence of their corresponding GET values.
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jbe@0
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336
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jbe@35
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337 Note: May be implemented through metamethods, but does support iteration
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jbe@35
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338 through pairs(...).
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jbe@35
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339
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jbe@0
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340
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jbe@0
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341 ### request.headers
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342
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jbe@0
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343 A table that maps (case-insensitively) a HTTP header field name to a sequence
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jbe@0
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344 of values. One entry is created for every occurrence of a header line with the
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jbe@0
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345 given field name).
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jbe@0
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346
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jbe@0
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347
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jbe@0
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348 ### request.headers_csv_string
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jbe@0
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349
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jbe@0
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350 A table that maps (case-insensitively) a HTTP header field name to a comma
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351 separated string. Multiple occurrences of the header with the given field name
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jbe@0
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352 are automatically merged into the comma separated string.
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jbe@0
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353
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jbe@0
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354
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jbe@0
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355 ### request.headers_csv_table
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jbe@0
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356
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jbe@0
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357 A table that maps (case-insensitively) a HTTP header field name to a sequence
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jbe@0
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358 of values. One entry is created for every comma separated value of each header
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359 with the given field name.
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jbe@0
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360
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jbe@0
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361
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jbe@0
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362 ### request.headers_flags
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jbe@0
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363
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jbe@0
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364 A table that maps (case-insensitively) a HTTP header field name to another
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jbe@0
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365 table which (again case-insensitively) maps a string to a boolean, depending on
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366 whether this string occurred in the list of comma separated values of one
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367 header line with the given field name that was the key in the first table.
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jbe@0
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368
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jbe@0
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369
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jbe@0
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370 ### request.headers_value
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jbe@0
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371
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jbe@0
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372 A table that maps (case-insensitively) a HTTP header field name to a value. If
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373 multiple header lines with the given field name have been received, false is
|
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jbe@0
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374 used as value.
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jbe@0
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375
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jbe@0
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376
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|
jbe@0
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377 ### request.method
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jbe@0
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378
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jbe@0
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379 The HTTP request method, e.g. "HEAD", "GET", or "POST".
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jbe@0
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380
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jbe@0
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381
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jbe@0
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382 ### request.path
|
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jbe@0
|
383
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|
jbe@10
|
384 The requested path without a leading slash and without the query part (e.g.
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|
jbe@10
|
385 "index.html" if "/index.html?a=b&c=d" has been requested). For the query part,
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jbe@10
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386 see request.query.
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jbe@10
|
387
|
|
jbe@10
|
388 This value will be nil if (and only if) the request method is "OPTIONS" with a
|
|
jbe@10
|
389 request target equal to "*" (see also asterisk-form of request-target in
|
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jbe@10
|
390 section 5.3.4 in RFC 7230).
|
|
jbe@0
|
391
|
|
jbe@0
|
392
|
|
jbe@0
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393 ### request.post_metadata
|
|
jbe@0
|
394
|
|
jbe@0
|
395 Only set for multipart/form-data POST requests. A table that maps field names
|
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jbe@0
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396 to their corresponding POST metadata table which contains two entries:
|
|
jbe@0
|
397 "file_name" and "content_type". If there are several POST values with the given
|
|
jbe@0
|
398 field name, then the first value/file is used.
|
|
jbe@0
|
399
|
|
jbe@0
|
400
|
|
jbe@0
|
401 ### request.post_metadata_list
|
|
jbe@0
|
402
|
|
jbe@0
|
403 Only set for multipart/form-data POST requests. A table that maps field names
|
|
jbe@0
|
404 to a sequence with their corresponding POST metadata tables. Needed if multiple
|
|
jbe@0
|
405 files are uploaded with the same field name.
|
|
jbe@0
|
406
|
|
jbe@0
|
407
|
|
jbe@0
|
408 ### request.post_params
|
|
jbe@0
|
409
|
|
jbe@0
|
410 A table that maps field names to their corresponding POST value. If there are
|
|
jbe@0
|
411 several POST values with the given field name, then the first value is used.
|
|
jbe@0
|
412
|
|
jbe@35
|
413 Note: May be implemented through metamethods, but does support iteration
|
|
jbe@35
|
414 through pairs(...).
|
|
jbe@35
|
415
|
|
jbe@0
|
416
|
|
jbe@0
|
417 ### request.post_params_list
|
|
jbe@0
|
418
|
|
jbe@0
|
419 A table that maps field names to a sequence of their corresponding POST values.
|
|
jbe@0
|
420
|
|
jbe@35
|
421 Note: May be implemented through metamethods, but does support iteration
|
|
jbe@35
|
422 through pairs(...).
|
|
jbe@35
|
423
|
|
jbe@0
|
424
|
|
jbe@0
|
425 ### request.query
|
|
jbe@0
|
426
|
|
jbe@12
|
427 Query part of the request target including the leading question mark, e.g.
|
|
jbe@12
|
428 "?a=b&c=d" if the requested target is "/index.html?a=b&c=d". The data is
|
|
jbe@10
|
429 automatically parsed and made available through request.get_params and
|
|
jbe@10
|
430 request.get_params_list.
|
|
jbe@10
|
431
|
|
jbe@10
|
432 If there is no query part given in the request target, then this string is
|
|
jbe@10
|
433 the empty string. This value will be nil if (and only if) the request method
|
|
jbe@10
|
434 is "OPTIONS" with a request target equal to "*" (see also asterisk-form of
|
|
jbe@10
|
435 request-target in section 5.3.4 in RFC 7230).
|
|
jbe@0
|
436
|
|
jbe@0
|
437
|
|
jbe@0
|
438 ### request:process_request_body()
|
|
jbe@0
|
439
|
|
jbe@0
|
440 Starts processing the request body (if existent) to set the values
|
|
jbe@0
|
441 request.post_params, request.post_params_list, request.post_metadata, and
|
|
jbe@0
|
442 and request.post_metadata_list and/or to call POST field stream handlers that
|
|
jbe@0
|
443 have been previously registered with request:stream_post_param(...) or
|
|
jbe@0
|
444 request:stream_post_params(...).
|
|
jbe@0
|
445
|
|
jbe@0
|
446 This method gets invoked automatically when the POST param tables
|
|
jbe@0
|
447 (request.post_params, etc.) are accessed, or if a response is sent (to avoid
|
|
jbe@0
|
448 deadlocks with the webbrowser). (Note: Automatic request body processing on
|
|
jbe@0
|
449 write may be disabled by calling request:defer_reading().)
|
|
jbe@0
|
450
|
|
jbe@0
|
451 After this method returned, all registered POST field stream handlers have
|
|
jbe@0
|
452 received all data. Registration of other POST field stream handlers is not
|
|
jbe@0
|
453 possible after this method has been called (or after request.post_params_list
|
|
jbe@0
|
454 or request.post_params have been accessed).
|
|
jbe@0
|
455
|
|
jbe@0
|
456
|
|
jbe@0
|
457 ### request:send_data(...)
|
|
jbe@0
|
458
|
|
jbe@0
|
459 Sends data as response body. All arguments are converted via tostring(...) and
|
|
jbe@0
|
460 concatenated. May be called multiple times until the request has been finished
|
|
jbe@0
|
461 by calling request:finish().
|
|
jbe@0
|
462
|
|
jbe@0
|
463 If the request method (see request.method) is "HEAD", then calls to
|
|
jbe@0
|
464 request:send_data(...) are automatically ignored.
|
|
jbe@0
|
465
|
|
jbe@0
|
466
|
|
jbe@0
|
467 ### request:send_header(key, value)
|
|
jbe@0
|
468
|
|
jbe@0
|
469 Sends a HTTP response header that consists of the given key and the given
|
|
jbe@0
|
470 value. Note: Key and value must be provided as separate arguments. Before any
|
|
jbe@0
|
471 headers can be sent, a HTTP status must have been set with
|
|
jbe@0
|
472 request:send_status(status_string).
|
|
jbe@0
|
473
|
|
jbe@0
|
474
|
|
jbe@0
|
475 ### request:send_status(status_string)
|
|
jbe@0
|
476
|
|
jbe@0
|
477 Sends a HTTP response status that is given as a string consisting of a 3-digit
|
|
jbe@0
|
478 number and an explanatory string, e.g. "200 OK" or "404 Not Found". This
|
|
jbe@0
|
479 function must be called once before any headers or response body data may be
|
|
jbe@0
|
480 sent.
|
|
jbe@0
|
481
|
|
jbe@0
|
482
|
|
jbe@0
|
483 ### request.socket
|
|
jbe@0
|
484
|
|
jbe@0
|
485 The underlaying socket. Can be used to force a TCP RST, etc.
|
|
jbe@0
|
486
|
|
jbe@0
|
487
|
|
jbe@0
|
488 ### request:stream_post_param(field_name, callback)
|
|
jbe@0
|
489
|
|
jbe@0
|
490 Registers a stream handler for the given POST parameter. The callback function
|
|
jbe@0
|
491 will be called in the following manner:
|
|
jbe@0
|
492
|
|
jbe@0
|
493 - For the initial chunk, the first chunk gets passed as first argument while a
|
|
jbe@0
|
494 table with metadata ("field_name" and "content_type") gets passed as second
|
|
jbe@0
|
495 argument. In case of an immediate EOF (i.e. an empty file), the passed
|
|
jbe@0
|
496 chunk is the empty string. In all other cases the chunk has a length greater
|
|
jbe@0
|
497 than zero.
|
|
jbe@0
|
498 - For any remaining chunks, the respective chunk gets passed as first and only
|
|
jbe@0
|
499 argument (no metadata). Here, the chunk has always a length greater than
|
|
jbe@0
|
500 zero.
|
|
jbe@0
|
501 - To indicate the end of the stream, the callback function is called without
|
|
jbe@0
|
502 arguments. This also happens in case of an immediate EOF (see above).
|
|
jbe@0
|
503
|
|
jbe@0
|
504 In case of an immediate EOF (i.e. an empty file), the callback function is thus
|
|
jbe@0
|
505 called as follows:
|
|
jbe@0
|
506
|
|
jbe@0
|
507 - The first time with an empty string as first argument, and with the metadata
|
|
jbe@0
|
508 as second argument.
|
|
jbe@0
|
509 - The second time without any arguments.
|
|
jbe@0
|
510
|
|
jbe@0
|
511
|
|
jbe@0
|
512 ### request:stream_post_params(pattern, callback)
|
|
jbe@0
|
513
|
|
jbe@0
|
514 Same as request:stream_post_param(...) but providing a string pattern to match
|
|
jbe@0
|
515 multiple field names (e.g. "^file_[0-9]+$").
|
|
jbe@0
|
516
|
|
jbe@0
|
517
|
|
jbe@0
|
518 ### request:stream_request_body(callback)
|
|
jbe@0
|
519
|
|
jbe@0
|
520 Start streaming of request body. For each chunk of the request body, the
|
|
jbe@0
|
521 callback function is called with the corresponding chunk. End of data is
|
|
jbe@0
|
522 indicated through return of request:stream_request_body(...) (not by calling
|
|
jbe@0
|
523 the callback without arguments).
|
|
jbe@0
|
524
|
|
jbe@44
|
525 The function may be called with nil instead of a callback function. In this
|
|
jbe@44
|
526 case, the request body is read and discarded. Only if nil is passed instead of
|
|
jbe@44
|
527 a callback, then the function may also be invoked when the request body has
|
|
jbe@44
|
528 already been read and/or processed. In the latter case, the function performs
|
|
jbe@44
|
529 no operation.
|
|
jbe@0
|
530
|
|
jbe@44
|
531
|