moonbridge

annotate example_application.lua @ 26:19a6d18bf34e

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Added some comments to example_application.lua
author jbe
date Fri Jan 30 11:45:12 2015 +0100 (2015-01-30)
parents 6889aa20b19f
children 59f485dc48ea
rev   line source
jbe@0 1 -- Moonbridge example application
jbe@0 2 -- invoke with ./moonbridge example_application.lua
jbe@0 3
jbe@4 4 local http = require "moonbridge_http"
jbe@0 5
jbe@26 6 -- preparation before forking:
jbe@13 7 local documents = {}
jbe@13 8 for i, document_name in ipairs{"example_webpage.html", "example_webpage.css"} do
jbe@15 9 local file = assert(io.open(document_name))
jbe@26 10 documents[document_name] = file:read("*a") -- store file contents in memory
jbe@13 11 file:close()
jbe@13 12 end
jbe@0 13
jbe@0 14 listen{
jbe@0 15 -- listen to a tcp version 4 socket
jbe@0 16 { proto = "tcp4", port = 8080, localhost = true },
jbe@0 17
jbe@0 18 -- listen to a tcp version 6 socket
jbe@0 19 { proto = "tcp6", port = 8080, localhost = true },
jbe@0 20
jbe@0 21 -- listen to a unix domain socket
jbe@0 22 --{ proto = "local", path = 'socket' },
jbe@0 23
jbe@0 24 -- execute the listener regularly (without incoming connection)
jbe@0 25 --{ proto = "interval", name = "myint", delay = 10, strict = false },
jbe@0 26
jbe@0 27 -- desired number of spare (idle) processes
jbe@0 28 pre_fork = 1, -- number of forks
jbe@0 29
jbe@0 30 -- minimum number of processes
jbe@0 31 min_fork = 2, -- number of forks
jbe@0 32
jbe@0 33 -- maximum number of processes (hard limit)
jbe@0 34 max_fork = 16, -- number of forks
jbe@0 35
jbe@0 36 -- delay between creation of spare processes
jbe@0 37 fork_delay = 1, -- seconds
jbe@0 38
jbe@0 39 -- delay before retry of failed process creation
jbe@0 40 fork_error_delay = 2, -- seconds
jbe@0 41
jbe@0 42 -- delay between destruction of excessive spare processes
jbe@0 43 exit_delay = 60, -- seconds
jbe@0 44
jbe@0 45 -- idle time after a fork gets terminated
jbe@0 46 idle_timeout = 0, -- seconds (0 for no timeout)
jbe@0 47
jbe@0 48 -- maximum memory consumption before process gets terminated
jbe@23 49 --memory_limit = 1024*1024, -- bytes
jbe@0 50
jbe@11 51 -- preparation of process (executed after fork)
jbe@0 52 prepare = function()
jbe@26 53 -- e.g. open database connection
jbe@0 54 end,
jbe@0 55
jbe@0 56 -- connection handler
jbe@0 57 connect = http.generate_handler(
jbe@0 58 {
jbe@0 59 static_headers = {"Server: Moonbridge Example Server"},
jbe@0 60 request_body_size_limit = 16*1024*1024*1024 -- allow big file uploads
jbe@0 61 },
jbe@0 62 function(request)
jbe@0 63
jbe@23 64 local function file_not_found()
jbe@23 65 request:send_status("404 Not Found")
jbe@23 66 request:send_header("Content-Type", "text/html; chatset=UTF-8")
jbe@23 67 request:send_data("<html>\n")
jbe@23 68 request:send_data("<head><title>404 Not Found</title></head>\n")
jbe@23 69 request:send_data("<body><h1>404 Not Found</h1></body>\n")
jbe@23 70 request:send_data("</html>\n")
jbe@23 71 end
jbe@23 72
jbe@0 73 if request.method == "GET" or request.method == "HEAD" then
jbe@0 74
jbe@10 75 if request.path == "" then
jbe@0 76 request:send_status("303 See Other")
jbe@0 77 request:send_header("Location", "http://" .. request.headers_value.host .. "/example_webpage.html")
jbe@0 78
jbe@0 79 else
jbe@10 80 local document_name = request.path
jbe@0 81 local document_extension = string.match(document_name, "%.([^.])$")
jbe@26 82 local document = documents[document_name] -- loads file contents from memory
jbe@0 83 if document then
jbe@0 84 request:send_status("200 OK")
jbe@0 85 if document_extension == "html" then
jbe@0 86 request:send_header("Content-Type", "text/html; charset=UTF-8")
jbe@0 87 elseif document_extension == "css" then
jbe@0 88 request:send_header("Content-Type", "text/css; charset=UTF-8")
jbe@0 89 end
jbe@0 90 request:send_data(document)
jbe@0 91 else
jbe@23 92 file_not_found()
jbe@0 93 end
jbe@0 94
jbe@0 95 end
jbe@0 96
jbe@0 97 elseif request.method == "POST" then
jbe@0 98
jbe@10 99 if request.path == "post_example" then
jbe@0 100 local files = {}
jbe@0 101 do
jbe@0 102 local file
jbe@0 103 request:stream_post_param("files", function(chunk, field_name, meta)
jbe@0 104 if meta then
jbe@0 105 file = {
jbe@0 106 file_name = meta.file_name,
jbe@0 107 content_type = meta.content_type,
jbe@0 108 length = 0
jbe@0 109 }
jbe@0 110 end
jbe@0 111 if chunk then
jbe@0 112 file.length = file.length + #chunk
jbe@0 113 else
jbe@0 114 files[#files+1] = file
jbe@0 115 end
jbe@0 116 end)
jbe@0 117 end
jbe@0 118
jbe@0 119 request:send_status("200 OK")
jbe@0 120 request:send_header("Content-Type", "text/html; chatset=UTF-8")
jbe@0 121 request:send_data("<html>\n<head>\n")
jbe@0 122 request:send_data('<link href="example_webpage.css" rel="stylesheet" type="text/css">\n')
jbe@0 123 request:send_data("<title>Moonbridge Network Server for Lua Applications &ndash; Example Application</title>\n")
jbe@0 124 request:send_data("</head>\n<body>\n")
jbe@0 125 request:send_data("<h1>Moonbridge Network Server for Lua &ndash; Example Application</h1>\n")
jbe@0 126 request:send_data("<h2>POST request successful</h2>\n")
jbe@0 127 request:send_data('<table>\n<thead><th>File name</th><th>Content type</th><th class="numeric">Bytes received</th></thead>\n<tbody>\n')
jbe@0 128 for i, file in ipairs(files) do
jbe@0 129 request:send_data("<tr>")
jbe@0 130 request:send_data("<td>", http.encode_html(file.file_name or "(unknown)"), "</td>")
jbe@0 131 request:send_data("<td>", http.encode_html(file.content_type or "(unknown)"), "</td>")
jbe@0 132 request:send_data('<td class="numeric">', http.encode_html(tostring(file.length)), "</td>")
jbe@0 133 request:send_data("</tr>\n")
jbe@0 134 end
jbe@0 135 request:send_data("</tbody>\n</table>\n")
jbe@0 136 request:send_data("<p>Submitted comment: ", http.encode_html(request.post_params.comment), "</p>\n")
jbe@0 137 request:send_data("</body>\n</html>\n")
jbe@0 138
jbe@0 139 else
jbe@23 140 file_not_found()
jbe@0 141
jbe@23 142 end
jbe@0 143
jbe@0 144 else
jbe@13 145 request:send_text_status_response("405 Method not allowed")
jbe@0 146
jbe@0 147 end
jbe@0 148
jbe@0 149 -- returning false causes termination of current process (and re-forking)
jbe@0 150 return true
jbe@0 151 end),
jbe@0 152
jbe@0 153 -- executed on process termination
jbe@0 154 finish = function()
jbe@26 155 -- e.g. close database connection
jbe@0 156 end
jbe@0 157 }
jbe@0 158

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