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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()
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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.
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59
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60 Returns true on success, or nil plus error message in case of an I/O error.
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61 Using this method on sockets that have already been closed (or reset) will
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62 throw an error.
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63
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64 Warning: Pending data on the input stream may cause connection aborts (TCP RST)
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65 when network connections are used. All pending input data should have been read
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66 (or drained) before calling socket:close(). Use socket:finish() to send a
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67 TCP FIN packet to the peer before waiting for EOF from the peer.
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68
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69
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70 ### socket:drain(maxlen, terminator)
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71
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72 Same as socket:read(maxlen, terminator), but discards the input and returns the
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73 number of discarded bytes. If no bytes could be read but EOF was encountered,
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74 then true is returned.
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75
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76 In case of an I/O error, nil (as first return value) plus an error message (as
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77 second result value) are returned.
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78
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79
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80 ### socket:drain_nb(maxlen, terminator)
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81
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82 Same as socket:read_nb(maxlen, terminator), but discards the input and returns
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83 the number of discarded bytes. If no bytes could be read but EOF was
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84 encountered, then true is returned.
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85
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86 In case of an I/O error, nil (as first return value) plus an error message (as
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87 second result value) are returned.
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88
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89
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90 ### socket:finish()
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91
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92 Sends a TCP FIN packet to indicate EOF on write stream. Subsequent reads are
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93 still possible. When there is no more input data to be read, the connection
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94 should finally be closed with socket:close().
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95
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96 In case of local sockets (Unix Domain Sockets), socket:finish() simply closes
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97 the underlying socket and emulates EOF on subsequent reads. Also in this case,
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98 the connection should be finally closed with socket:close().
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99
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100
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jbe@91
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101 ### socket:flush(...)
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102
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103 Same as socket:write(...) but additionally flushes the socket (i.e. all pending
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104 data is passed to the operating system).
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105
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106 In case of an I/O error, nil (as first return value) plus an error message (as
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107 second result value) are returned. On success, the socket userdata object is
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108 returned.
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109
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110
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111 ### socket:flush_nb(...)
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112
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113 Same as socket:write_nb(...) but additionally flushes the socket (i.e. all
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114 pending data is passed to the operating system). The total number of bytes that
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115 could not be passed yet to the operating system is returned. Zero is returned
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116 if all data could be flushed out.
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117
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118 In case of an I/O error, nil (as first return value) plus an error message (as
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119 second result value) are returned.
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120
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121
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122 ### socket.interval
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123
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124 Set to the name of an interval timer if the "connect" handler was called due to
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125 an elapsed interval timer. Otherwise nil.
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126
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127
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128 ### socket.local_ip4
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129
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130 Local IPv4 address used for the connection. Encoded as 4 raw bytes in form of a
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131 string.
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132
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133
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134 ### socket.local_ip6
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135
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136 Local IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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137 a string.
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138
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139
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140 ### socket.local_tcpport
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141
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142 Local TCP port used for the connection.
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143
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144
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jbe@91
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145 ### socket:read(maxlen, terminator)
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146
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147 Read up to maxlen bytes or until an optional termination character is
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148 encountered (which is included in the result). The maxlen value may be nil, in
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149 which case there is no limit on the number of bytes read.
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150
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151 If EOF is encountered before any data could be read, then false (as first
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152 return value) plus a notice string (as second return value) are returned.
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153
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154 In case of an I/O error, nil (as first return value) plus an error message (as
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155 second result value) are returned.
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156
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157
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158 ### socket:read_nb(maxlen, terminator)
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159
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160 Read up to maxlen bytes, until an optional termination character is encountered
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161 (which is included in the result), or until no more data is available for
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162 reading. The maxlen value may be nil, in which case there is no limit on the
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163 number of bytes read.
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164
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165 If EOF is encountered before any data could be read, then false (as first
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166 return value) plus a notice string (as second return value) are returned.
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167
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168 If no data was available for reading, but no EOF was encountered, then an empty
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169 string is returned.
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170
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171 In case of an I/O error, nil (as first return value) plus an error message (as
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172 second result value) are returned.
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173
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174
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175 ### socket.remote_ip4
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176
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177 Remote IPv4 address used for the connection. Encoded as 4 raw bytes in form of
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178 a string.
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179
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180
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181 ### socket.remote_ip6
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182
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183 Remote IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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184 a string.
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185
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186
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187 ### socket.remote_tcpport
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188
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189 Remote TCP port used for the connection.
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190
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191
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192 ### socket:reset()
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193
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194 Alias for socket:close(0). Closes the socket connection by sending a TCP RST
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195 packet if possible to indicate error condition.
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196
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197 Returns true on success, or nil (as first result value) plus error message (as
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198 second result value) in case of an I/O error. Using this method on sockets that
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199 have already been closed (or reset) will throw an error.
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200
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201 Warning: Previously sent (and flushed) data may be lost during transmission.
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202
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203
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204 ### socket:write(...)
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205
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206 Takes a variable number of strings and sends them to the peer. The operation is
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207 buffered, so to actually send out the data, it is necessary to eventually call
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208 socket:flush(), socket:finish(), or socket:close().
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209
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210 In case of an I/O error, nil (as first return value) plus an error message (as
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211 second result value) are returned. On success, the socket userdata object is
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212 returned.
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213
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214
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215 ### socket:write_nb(...)
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216
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217 Takes a variable number of strings and sends them to the peer. The operation is
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218 buffered, so to actually send out the data, it is necessary to eventually call
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219 socket:flush_nb(), socket:flush(), socket:finish(), or socket:close().
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220
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221 This function always returns immediately (i.e. it does not block). If all data
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222 (but a small buffered portion) could be sent out, then zero is returned.
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223 Otherwise, all arguments that could not be sent are stored in a buffer of
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224 unlimited size (up to memory capabilities) and an integer is returned that
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225 indicates the number of bytes currently in the buffer.
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226
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227 In case of an I/O error, nil (as first return value) plus an error message (as
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228 second result value) are returned.
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229
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230
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231
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232 I/O library
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233 -----------
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234
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235 The Moonbridge Network Server for Lua Applications comes with its own I/O
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236 library to support blocking as well as nonblocking I/O operations.
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237
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238
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239 ### moonbridge_io.tcpconnect(hostname, port)
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240
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241 Tries to open a TCP connection with the given host and TCP port number. Returns
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242 a socket object on success (methods see above), or nil (as first return value)
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243 plus an error message (as second return value) in case of error.
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244
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245
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246
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247 HTTP module
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248 -----------
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249
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250 The http module exports the function http.generate_handler(callback) that
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251 converts an HTTP handler to a "connect" handler. See file "example.lua" for an
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252 example of invocation. A table with options may be passed either as a second
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253 argument, or as a first argument preceeding the callback function (whichever is
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254 more convenient).
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255
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256 The following options are supported:
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257
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258 - request_body_size_limit: maximum size of payload of HTTP request body
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259 (transfer encoding is allowed to add a limited amount of extra data)
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260 - chunk_size: optional default value for maximum_input_chunk_size and
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261 minimum_output_chunk_size
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262 - request_header_size_limit: maximum size of HTTP request headers
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263 - maximum_input_chunk_size: maximum chunk size when streaming a request body or
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264 certain POST fields (bigger chunks will be fragmented automatically)
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265 - minimum_output_chunk_size: minimum size for a chunk when sending a response
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266 body (smaller chunks will be buffered and concatenated with future data;
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267 ignored when request:flush() is called)
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268 - static_headers: a set of headers to be included in every HTTP response
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269 (may be a string, a table or strings, or a table of key-value pairs)
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270
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271 The callback function receives a single request object as argument, which is
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272 described below.
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273
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274
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275 ### request.body
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276
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277 The request body (without headers) as a string. Accessing this value makes
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278 further access to request.post_params and request.post_params_list, or
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279 invocation of request:stream_request_body(...) impossible.
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280
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281
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jbe@60
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282 ### request:close_after_finish()
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283
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284 Closes the connection after answering the request.
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285
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286 This method can only be called before the HTTP response header section has been
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287 finished (i.e. before request:finish_headers(), request:send_data(...), or
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288 request:finish() were called), but it may be called before a status code has
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289 been sent using request:send_status(...).
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290
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291 A corresponding "Connection: close" header is automatically sent.
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292
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293
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294 ### request.cookies
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295
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296 A table with all cookies sent by the client.
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297
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298
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299 ### request.defer_reading()
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300
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301 Disables automatic request body processing on write. Can be called before
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302 sending a HTTP status code to send a response before the request has been fully
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303 received.
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304
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305 CAUTION: Responding to a request before the request body has been processed may
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306 lead to a deadlock if the browser does not process the response while trying to
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307 send the request. Therefore, this function should only be used if:
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308
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309 - the TCP stack has enough buffer space for the response (i.e. if the response
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310 is small enough), and if
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311 - a timer is used to cancel the response in case of a deadlock.
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312
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313 It is recommended to not use this function unless certain performance tweaks
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314 are desired.
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315
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316
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jbe@50
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317 ### request.faulty
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318
|
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jbe@50
|
319 Normally set to false. In case of a read or write error on the client
|
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jbe@50
|
320 connection, this value is set to true before a Lua error is raised.
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jbe@50
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321
|
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jbe@50
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322 A faulty request handle must not be used, or another Lua error will be raised.
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jbe@50
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323
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jbe@50
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324
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jbe@0
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325 ### request:finish()
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jbe@0
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326
|
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jbe@0
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327 Finishes and flushes a HTTP response. May be called multiple times. An
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jbe@0
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328 HTTP status, all headers, and the response body (if applicable) must have been
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jbe@0
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329 previously sent. After calling this method, no further data may be written.
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jbe@0
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330
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jbe@0
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331
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jbe@0
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332 ### request:finish_headers()
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jbe@0
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333
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jbe@0
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334 Finishes and flushes the HTTP response header section. May be called multiple
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jbe@0
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335 times, as long as the request is not finished completely. This method is
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jbe@0
|
336 automatically invoked if the application is beginning to send a response body.
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jbe@0
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337 After calling this method, no further headers may be sent.
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jbe@0
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338
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jbe@0
|
339
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jbe@0
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340 ### request:flush()
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jbe@0
|
341
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jbe@0
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342 Flushes any pending output data. Note: In order to mark the end of a response
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jbe@0
|
343 body, it is required to call request:finish().
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jbe@0
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344
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jbe@0
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345
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jbe@0
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346 ### request.get_params
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jbe@0
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347
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jbe@0
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348 A table that maps field names to their corresponding GET value. If there are
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jbe@0
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349 several GET values with the given field name, then the first value is used.
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jbe@0
|
350
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jbe@35
|
351 Note: May be implemented through metamethods, but does support iteration
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jbe@35
|
352 through pairs(...).
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jbe@35
|
353
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jbe@0
|
354
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jbe@0
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355 ### request.get_params_list
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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 field names to a sequence of their corresponding GET values.
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jbe@0
|
358
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jbe@35
|
359 Note: May be implemented through metamethods, but does support iteration
|
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jbe@35
|
360 through pairs(...).
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jbe@35
|
361
|
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jbe@0
|
362
|
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jbe@0
|
363 ### request.headers
|
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jbe@0
|
364
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jbe@0
|
365 A table that maps (case-insensitively) a HTTP header field name to a sequence
|
|
jbe@0
|
366 of values. One entry is created for every occurrence of a header line with the
|
|
jbe@0
|
367 given field name).
|
|
jbe@0
|
368
|
|
jbe@0
|
369
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|
jbe@0
|
370 ### request.headers_csv_string
|
|
jbe@0
|
371
|
|
jbe@0
|
372 A table that maps (case-insensitively) a HTTP header field name to a comma
|
|
jbe@0
|
373 separated string. Multiple occurrences of the header with the given field name
|
|
jbe@0
|
374 are automatically merged into the comma separated string.
|
|
jbe@0
|
375
|
|
jbe@0
|
376
|
|
jbe@0
|
377 ### request.headers_csv_table
|
|
jbe@0
|
378
|
|
jbe@0
|
379 A table that maps (case-insensitively) a HTTP header field name to a sequence
|
|
jbe@0
|
380 of values. One entry is created for every comma separated value of each header
|
|
jbe@0
|
381 with the given field name.
|
|
jbe@0
|
382
|
|
jbe@0
|
383
|
|
jbe@0
|
384 ### request.headers_flags
|
|
jbe@0
|
385
|
|
jbe@0
|
386 A table that maps (case-insensitively) a HTTP header field name to another
|
|
jbe@0
|
387 table which (again case-insensitively) maps a string to a boolean, depending on
|
|
jbe@0
|
388 whether this string occurred in the list of comma separated values of one
|
|
jbe@0
|
389 header line with the given field name that was the key in the first table.
|
|
jbe@0
|
390
|
|
jbe@0
|
391
|
|
jbe@0
|
392 ### request.headers_value
|
|
jbe@0
|
393
|
|
jbe@0
|
394 A table that maps (case-insensitively) a HTTP header field name to a value. If
|
|
jbe@0
|
395 multiple header lines with the given field name have been received, false is
|
|
jbe@0
|
396 used as value.
|
|
jbe@0
|
397
|
|
jbe@0
|
398
|
|
jbe@0
|
399 ### request.method
|
|
jbe@0
|
400
|
|
jbe@0
|
401 The HTTP request method, e.g. "HEAD", "GET", or "POST".
|
|
jbe@0
|
402
|
|
jbe@0
|
403
|
|
jbe@0
|
404 ### request.path
|
|
jbe@0
|
405
|
|
jbe@10
|
406 The requested path without a leading slash and without the query part (e.g.
|
|
jbe@10
|
407 "index.html" if "/index.html?a=b&c=d" has been requested). For the query part,
|
|
jbe@10
|
408 see request.query.
|
|
jbe@10
|
409
|
|
jbe@10
|
410 This value will be nil if (and only if) the request method is "OPTIONS" with a
|
|
jbe@10
|
411 request target equal to "*" (see also asterisk-form of request-target in
|
|
jbe@10
|
412 section 5.3.4 in RFC 7230).
|
|
jbe@0
|
413
|
|
jbe@0
|
414
|
|
jbe@0
|
415 ### request.post_metadata
|
|
jbe@0
|
416
|
|
jbe@0
|
417 Only set for multipart/form-data POST requests. A table that maps field names
|
|
jbe@0
|
418 to their corresponding POST metadata table which contains two entries:
|
|
jbe@0
|
419 "file_name" and "content_type". If there are several POST values with the given
|
|
jbe@0
|
420 field name, then the first value/file is used.
|
|
jbe@0
|
421
|
|
jbe@0
|
422
|
|
jbe@0
|
423 ### request.post_metadata_list
|
|
jbe@0
|
424
|
|
jbe@0
|
425 Only set for multipart/form-data POST requests. A table that maps field names
|
|
jbe@0
|
426 to a sequence with their corresponding POST metadata tables. Needed if multiple
|
|
jbe@0
|
427 files are uploaded with the same field name.
|
|
jbe@0
|
428
|
|
jbe@0
|
429
|
|
jbe@0
|
430 ### request.post_params
|
|
jbe@0
|
431
|
|
jbe@0
|
432 A table that maps field names to their corresponding POST value. If there are
|
|
jbe@0
|
433 several POST values with the given field name, then the first value is used.
|
|
jbe@0
|
434
|
|
jbe@35
|
435 Note: May be implemented through metamethods, but does support iteration
|
|
jbe@35
|
436 through pairs(...).
|
|
jbe@35
|
437
|
|
jbe@0
|
438
|
|
jbe@0
|
439 ### request.post_params_list
|
|
jbe@0
|
440
|
|
jbe@0
|
441 A table that maps field names to a sequence of their corresponding POST values.
|
|
jbe@0
|
442
|
|
jbe@35
|
443 Note: May be implemented through metamethods, but does support iteration
|
|
jbe@35
|
444 through pairs(...).
|
|
jbe@35
|
445
|
|
jbe@0
|
446
|
|
jbe@0
|
447 ### request.query
|
|
jbe@0
|
448
|
|
jbe@12
|
449 Query part of the request target including the leading question mark, e.g.
|
|
jbe@12
|
450 "?a=b&c=d" if the requested target is "/index.html?a=b&c=d". The data is
|
|
jbe@10
|
451 automatically parsed and made available through request.get_params and
|
|
jbe@10
|
452 request.get_params_list.
|
|
jbe@10
|
453
|
|
jbe@10
|
454 If there is no query part given in the request target, then this string is
|
|
jbe@10
|
455 the empty string. This value will be nil if (and only if) the request method
|
|
jbe@10
|
456 is "OPTIONS" with a request target equal to "*" (see also asterisk-form of
|
|
jbe@10
|
457 request-target in section 5.3.4 in RFC 7230).
|
|
jbe@0
|
458
|
|
jbe@0
|
459
|
|
jbe@0
|
460 ### request:process_request_body()
|
|
jbe@0
|
461
|
|
jbe@0
|
462 Starts processing the request body (if existent) to set the values
|
|
jbe@0
|
463 request.post_params, request.post_params_list, request.post_metadata, and
|
|
jbe@0
|
464 and request.post_metadata_list and/or to call POST field stream handlers that
|
|
jbe@0
|
465 have been previously registered with request:stream_post_param(...) or
|
|
jbe@0
|
466 request:stream_post_params(...).
|
|
jbe@0
|
467
|
|
jbe@0
|
468 This method gets invoked automatically when the POST param tables
|
|
jbe@0
|
469 (request.post_params, etc.) are accessed, or if a response is sent (to avoid
|
|
jbe@0
|
470 deadlocks with the webbrowser). (Note: Automatic request body processing on
|
|
jbe@0
|
471 write may be disabled by calling request:defer_reading().)
|
|
jbe@0
|
472
|
|
jbe@0
|
473 After this method returned, all registered POST field stream handlers have
|
|
jbe@0
|
474 received all data. Registration of other POST field stream handlers is not
|
|
jbe@0
|
475 possible after this method has been called (or after request.post_params_list
|
|
jbe@0
|
476 or request.post_params have been accessed).
|
|
jbe@0
|
477
|
|
jbe@0
|
478
|
|
jbe@0
|
479 ### request:send_data(...)
|
|
jbe@0
|
480
|
|
jbe@0
|
481 Sends data as response body. All arguments are converted via tostring(...) and
|
|
jbe@0
|
482 concatenated. May be called multiple times until the request has been finished
|
|
jbe@0
|
483 by calling request:finish().
|
|
jbe@0
|
484
|
|
jbe@0
|
485 If the request method (see request.method) is "HEAD", then calls to
|
|
jbe@0
|
486 request:send_data(...) are automatically ignored.
|
|
jbe@0
|
487
|
|
jbe@0
|
488
|
|
jbe@0
|
489 ### request:send_header(key, value)
|
|
jbe@0
|
490
|
|
jbe@0
|
491 Sends a HTTP response header that consists of the given key and the given
|
|
jbe@0
|
492 value. Note: Key and value must be provided as separate arguments. Before any
|
|
jbe@0
|
493 headers can be sent, a HTTP status must have been set with
|
|
jbe@0
|
494 request:send_status(status_string).
|
|
jbe@0
|
495
|
|
jbe@0
|
496
|
|
jbe@0
|
497 ### request:send_status(status_string)
|
|
jbe@0
|
498
|
|
jbe@0
|
499 Sends a HTTP response status that is given as a string consisting of a 3-digit
|
|
jbe@0
|
500 number and an explanatory string, e.g. "200 OK" or "404 Not Found". This
|
|
jbe@0
|
501 function must be called once before any headers or response body data may be
|
|
jbe@0
|
502 sent.
|
|
jbe@0
|
503
|
|
jbe@0
|
504
|
|
jbe@0
|
505 ### request.socket
|
|
jbe@0
|
506
|
|
jbe@0
|
507 The underlaying socket. Can be used to force a TCP RST, etc.
|
|
jbe@0
|
508
|
|
jbe@0
|
509
|
|
jbe@0
|
510 ### request:stream_post_param(field_name, callback)
|
|
jbe@0
|
511
|
|
jbe@0
|
512 Registers a stream handler for the given POST parameter. The callback function
|
|
jbe@0
|
513 will be called in the following manner:
|
|
jbe@0
|
514
|
|
jbe@0
|
515 - For the initial chunk, the first chunk gets passed as first argument while a
|
|
jbe@0
|
516 table with metadata ("field_name" and "content_type") gets passed as second
|
|
jbe@0
|
517 argument. In case of an immediate EOF (i.e. an empty file), the passed
|
|
jbe@0
|
518 chunk is the empty string. In all other cases the chunk has a length greater
|
|
jbe@0
|
519 than zero.
|
|
jbe@0
|
520 - For any remaining chunks, the respective chunk gets passed as first and only
|
|
jbe@0
|
521 argument (no metadata). Here, the chunk has always a length greater than
|
|
jbe@0
|
522 zero.
|
|
jbe@0
|
523 - To indicate the end of the stream, the callback function is called without
|
|
jbe@0
|
524 arguments. This also happens in case of an immediate EOF (see above).
|
|
jbe@0
|
525
|
|
jbe@0
|
526 In case of an immediate EOF (i.e. an empty file), the callback function is thus
|
|
jbe@0
|
527 called as follows:
|
|
jbe@0
|
528
|
|
jbe@0
|
529 - The first time with an empty string as first argument, and with the metadata
|
|
jbe@0
|
530 as second argument.
|
|
jbe@0
|
531 - The second time without any arguments.
|
|
jbe@0
|
532
|
|
jbe@0
|
533
|
|
jbe@0
|
534 ### request:stream_post_params(pattern, callback)
|
|
jbe@0
|
535
|
|
jbe@0
|
536 Same as request:stream_post_param(...) but providing a string pattern to match
|
|
jbe@0
|
537 multiple field names (e.g. "^file_[0-9]+$").
|
|
jbe@0
|
538
|
|
jbe@0
|
539
|
|
jbe@0
|
540 ### request:stream_request_body(callback)
|
|
jbe@0
|
541
|
|
jbe@0
|
542 Start streaming of request body. For each chunk of the request body, the
|
|
jbe@0
|
543 callback function is called with the corresponding chunk. End of data is
|
|
jbe@0
|
544 indicated through return of request:stream_request_body(...) (not by calling
|
|
jbe@0
|
545 the callback without arguments).
|
|
jbe@0
|
546
|
|
jbe@44
|
547 The function may be called with nil instead of a callback function. In this
|
|
jbe@44
|
548 case, the request body is read and discarded. Only if nil is passed instead of
|
|
jbe@44
|
549 a callback, then the function may also be invoked when the request body has
|
|
jbe@44
|
550 already been read and/or processed. In the latter case, the function performs
|
|
jbe@44
|
551 no operation.
|
|
jbe@0
|
552
|
|
jbe@44
|
553
|