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annotate etc/check-links.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.
Eric Wing <ewing . public |-at-| gmail . com>
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1 -----------------------------------------------------------------------------
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2 -- Little program that checks links in HTML files, using coroutines and
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3 -- non-blocking I/O via the dispatcher module.
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4 -- LuaSocket sample files
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5 -- Author: Diego Nehab
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6 -- RCS ID: $$
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7 -----------------------------------------------------------------------------
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8 local url = require("socket.url")
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9 local dispatch = require("dispatch")
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10 local http = require("socket.http")
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11 dispatch.TIMEOUT = 10
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12
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13 -- make sure the user knows how to invoke us
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14 arg = arg or {}
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15 if table.getn(arg) < 1 then
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16 print("Usage:\n luasocket check-links.lua [-n] {<url>}")
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17 exit()
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18 end
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19
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20 -- '-n' means we are running in non-blocking mode
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21 if arg[1] == "-n" then
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22 -- if non-blocking I/O was requested, use real dispatcher interface
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23 table.remove(arg, 1)
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24 handler = dispatch.newhandler("coroutine")
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25 else
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26 -- if using blocking I/O, use fake dispatcher interface
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27 handler = dispatch.newhandler("sequential")
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28 end
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29
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30 local nthreads = 0
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31
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32 -- get the status of a URL using the dispatcher
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33 function getstatus(link)
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34 local parsed = url.parse(link, {scheme = "file"})
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35 if parsed.scheme == "http" then
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36 nthreads = nthreads + 1
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37 handler:start(function()
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38 local r, c, h, s = http.request{
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39 method = "HEAD",
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40 url = link,
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41 create = handler.tcp
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42 }
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43 if r and c == 200 then io.write('\t', link, '\n')
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44 else io.write('\t', link, ': ', tostring(c), '\n') end
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45 nthreads = nthreads - 1
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46 end)
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47 end
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48 end
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49
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50 function readfile(path)
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51 path = url.unescape(path)
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52 local file, error = io.open(path, "r")
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53 if file then
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54 local body = file:read("*a")
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55 file:close()
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56 return body
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57 else return nil, error end
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58 end
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59
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60 function load(u)
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61 local parsed = url.parse(u, { scheme = "file" })
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62 local body, headers, code, error
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63 local base = u
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64 if parsed.scheme == "http" then
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65 body, code, headers = http.request(u)
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66 if code == 200 then
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67 -- if there was a redirect, update base to reflect it
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68 base = headers.location or base
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69 end
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70 if not body then
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71 error = code
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72 end
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73 elseif parsed.scheme == "file" then
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74 body, error = readfile(parsed.path)
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75 else error = string.format("unhandled scheme '%s'", parsed.scheme) end
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76 return base, body, error
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77 end
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78
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79 function getlinks(body, base)
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80 -- get rid of comments
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81 body = string.gsub(body, "%<%!%-%-.-%-%-%>", "")
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82 local links = {}
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83 -- extract links
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84 body = string.gsub(body, '[Hh][Rr][Ee][Ff]%s*=%s*"([^"]*)"', function(href)
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85 table.insert(links, url.absolute(base, href))
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86 end)
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87 body = string.gsub(body, "[Hh][Rr][Ee][Ff]%s*=%s*'([^']*)'", function(href)
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88 table.insert(links, url.absolute(base, href))
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89 end)
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90 string.gsub(body, "[Hh][Rr][Ee][Ff]%s*=%s*(.-)>", function(href)
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91 table.insert(links, url.absolute(base, href))
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92 end)
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93 return links
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94 end
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95
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96 function checklinks(address)
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97 local base, body, error = load(address)
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98 if not body then print(error) return end
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99 print("Checking ", base)
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100 local links = getlinks(body, base)
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101 for _, link in ipairs(links) do
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102 getstatus(link)
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103 end
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104 end
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105
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106 for _, address in ipairs(arg) do
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107 checklinks(url.absolute("file:", address))
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108 end
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109
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110 while nthreads > 0 do
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111 handler:step()
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112 end