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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.
Eric Wing <ewing . public |-at-| gmail . com>
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1 -----------------------------------------------------------------------------
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2 -- Little program to download files from URLs
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3 -- LuaSocket sample files
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4 -- Author: Diego Nehab
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5 -- RCS ID: $Id: get.lua,v 1.25 2007/03/12 04:08:40 diego Exp $
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6 -----------------------------------------------------------------------------
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7 local socket = require("socket")
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8 local http = require("socket.http")
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9 local ftp = require("socket.ftp")
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10 local url = require("socket.url")
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11 local ltn12 = require("ltn12")
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12
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13 -- formats a number of seconds into human readable form
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14 function nicetime(s)
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15 local l = "s"
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16 if s > 60 then
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17 s = s / 60
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18 l = "m"
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19 if s > 60 then
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20 s = s / 60
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21 l = "h"
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22 if s > 24 then
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23 s = s / 24
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24 l = "d" -- hmmm
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25 end
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26 end
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27 end
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28 if l == "s" then return string.format("%5.0f%s", s, l)
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29 else return string.format("%5.2f%s", s, l) end
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30 end
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31
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32 -- formats a number of bytes into human readable form
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33 function nicesize(b)
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34 local l = "B"
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35 if b > 1024 then
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36 b = b / 1024
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37 l = "KB"
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38 if b > 1024 then
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39 b = b / 1024
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40 l = "MB"
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41 if b > 1024 then
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42 b = b / 1024
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43 l = "GB" -- hmmm
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44 end
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45 end
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46 end
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47 return string.format("%7.2f%2s", b, l)
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48 end
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49
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50 -- returns a string with the current state of the download
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51 local remaining_s = "%s received, %s/s throughput, %2.0f%% done, %s remaining"
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52 local elapsed_s = "%s received, %s/s throughput, %s elapsed "
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53 function gauge(got, delta, size)
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54 local rate = got / delta
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55 if size and size >= 1 then
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56 return string.format(remaining_s, nicesize(got), nicesize(rate),
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57 100*got/size, nicetime((size-got)/rate))
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58 else
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59 return string.format(elapsed_s, nicesize(got),
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60 nicesize(rate), nicetime(delta))
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61 end
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62 end
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63
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64 -- creates a new instance of a receive_cb that saves to disk
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65 -- kind of copied from luasocket's manual callback examples
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66 function stats(size)
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67 local start = socket.gettime()
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68 local last = start
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69 local got = 0
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70 return function(chunk)
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71 -- elapsed time since start
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72 local current = socket.gettime()
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73 if chunk then
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74 -- total bytes received
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75 got = got + string.len(chunk)
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76 -- not enough time for estimate
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77 if current - last > 1 then
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78 io.stderr:write("\r", gauge(got, current - start, size))
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79 io.stderr:flush()
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80 last = current
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81 end
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82 else
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83 -- close up
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84 io.stderr:write("\r", gauge(got, current - start), "\n")
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85 end
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86 return chunk
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87 end
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88 end
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89
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90 -- determines the size of a http file
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91 function gethttpsize(u)
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92 local r, c, h = http.request {method = "HEAD", url = u}
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93 if c == 200 then
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94 return tonumber(h["content-length"])
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95 end
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96 end
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97
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98 -- downloads a file using the http protocol
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99 function getbyhttp(u, file)
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100 local save = ltn12.sink.file(file or io.stdout)
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101 -- only print feedback if output is not stdout
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102 if file then save = ltn12.sink.chain(stats(gethttpsize(u)), save) end
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103 local r, c, h, s = http.request {url = u, sink = save }
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104 if c ~= 200 then io.stderr:write(s or c, "\n") end
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105 end
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106
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107 -- downloads a file using the ftp protocol
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108 function getbyftp(u, file)
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109 local save = ltn12.sink.file(file or io.stdout)
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110 -- only print feedback if output is not stdout
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111 -- and we don't know how big the file is
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112 if file then save = ltn12.sink.chain(stats(), save) end
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113 local gett = url.parse(u)
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114 gett.sink = save
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115 gett.type = "i"
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116 local ret, err = ftp.get(gett)
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117 if err then print(err) end
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118 end
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119
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120 -- determines the scheme
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121 function getscheme(u)
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122 -- this is an heuristic to solve a common invalid url poblem
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123 if not string.find(u, "//") then u = "//" .. u end
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124 local parsed = url.parse(u, {scheme = "http"})
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125 return parsed.scheme
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126 end
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127
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128 -- gets a file either by http or ftp, saving as <name>
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129 function get(u, name)
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130 local fout = name and io.open(name, "wb")
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131 local scheme = getscheme(u)
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132 if scheme == "ftp" then getbyftp(u, fout)
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133 elseif scheme == "http" then getbyhttp(u, fout)
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134 else print("unknown scheme" .. scheme) end
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135 end
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136
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137 -- main program
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138 arg = arg or {}
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139 if table.getn(arg) < 1 then
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140 io.write("Usage:\n lua get.lua <remote-url> [<local-file>]\n")
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141 os.exit(1)
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142 else get(arg[1], arg[2]) end