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annotate src/tp.lua @ 0:4b915342e2a8

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LuaSocket 2.0.2 + CMake build description.
author Eric Wing <ewing . public |-at-| gmail . com>
date Tue, 26 Aug 2008 18:40:01 -0700
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4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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1 -----------------------------------------------------------------------------
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2 -- Unified SMTP/FTP subsystem
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3 -- LuaSocket toolkit.
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4 -- Author: Diego Nehab
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5 -- RCS ID: $Id: tp.lua,v 1.22 2006/03/14 09:04:15 diego Exp $
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6 -----------------------------------------------------------------------------
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7
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8 -----------------------------------------------------------------------------
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9 -- Declare module and import dependencies
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10 -----------------------------------------------------------------------------
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11 local base = _G
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12 local string = require("string")
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13 local socket = require("socket")
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14 local ltn12 = require("ltn12")
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15 module("socket.tp")
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16
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17 -----------------------------------------------------------------------------
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18 -- Program constants
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19 -----------------------------------------------------------------------------
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20 TIMEOUT = 60
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21
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22 -----------------------------------------------------------------------------
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23 -- Implementation
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24 -----------------------------------------------------------------------------
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25 -- gets server reply (works for SMTP and FTP)
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26 local function get_reply(c)
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27 local code, current, sep
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28 local line, err = c:receive()
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29 local reply = line
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30 if err then return nil, err end
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31 code, sep = socket.skip(2, string.find(line, "^(%d%d%d)(.?)"))
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32 if not code then return nil, "invalid server reply" end
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33 if sep == "-" then -- reply is multiline
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34 repeat
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35 line, err = c:receive()
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36 if err then return nil, err end
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37 current, sep = socket.skip(2, string.find(line, "^(%d%d%d)(.?)"))
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38 reply = reply .. "\n" .. line
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39 -- reply ends with same code
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40 until code == current and sep == " "
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41 end
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42 return code, reply
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43 end
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44
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45 -- metatable for sock object
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46 local metat = { __index = {} }
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47
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48 function metat.__index:check(ok)
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49 local code, reply = get_reply(self.c)
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50 if not code then return nil, reply end
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51 if base.type(ok) ~= "function" then
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52 if base.type(ok) == "table" then
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53 for i, v in base.ipairs(ok) do
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54 if string.find(code, v) then
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55 return base.tonumber(code), reply
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56 end
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57 end
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58 return nil, reply
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59 else
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60 if string.find(code, ok) then return base.tonumber(code), reply
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61 else return nil, reply end
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62 end
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63 else return ok(base.tonumber(code), reply) end
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64 end
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65
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66 function metat.__index:command(cmd, arg)
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67 if arg then
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68 return self.c:send(cmd .. " " .. arg.. "\r\n")
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69 else
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70 return self.c:send(cmd .. "\r\n")
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71 end
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72 end
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73
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74 function metat.__index:sink(snk, pat)
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75 local chunk, err = c:receive(pat)
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76 return snk(chunk, err)
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77 end
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78
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79 function metat.__index:send(data)
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80 return self.c:send(data)
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81 end
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82
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83 function metat.__index:receive(pat)
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84 return self.c:receive(pat)
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85 end
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86
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87 function metat.__index:getfd()
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88 return self.c:getfd()
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89 end
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90
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91 function metat.__index:dirty()
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92 return self.c:dirty()
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93 end
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94
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95 function metat.__index:getcontrol()
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96 return self.c
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97 end
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98
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99 function metat.__index:source(source, step)
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100 local sink = socket.sink("keep-open", self.c)
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101 local ret, err = ltn12.pump.all(source, sink, step or ltn12.pump.step)
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102 return ret, err
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103 end
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104
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105 -- closes the underlying c
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106 function metat.__index:close()
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107 self.c:close()
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108 return 1
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109 end
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110
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111 -- connect with server and return c object
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112 function connect(host, port, timeout, create)
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113 local c, e = (create or socket.tcp)()
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114 if not c then return nil, e end
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115 c:settimeout(timeout or TIMEOUT)
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116 local r, e = c:connect(host, port)
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117 if not r then
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118 c:close()
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119 return nil, e
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120 end
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121 return base.setmetatable({c = c}, metat)
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122 end
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123