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https://github.com/lunarmodules/luasocket.git
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Updated for LuaSocket 1.4
Prints a bunch of information during download.
This commit is contained in:
Diego Nehab
parent
2f07549722
commit
e5e1f3dc7a
169
etc/get.lua
169
etc/get.lua
@ -1,33 +1,73 @@
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assert(dofile("../lua/buffer.lua"))
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-- this examples needs it all
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assert(dofile("../lua/code.lua"))
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assert(dofile("../lua/ftp.lua"))
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assert(dofile("../lua/base64.lua"))
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assert(dofile("../lua/concat.lua"))
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assert(dofile("../lua/url.lua"))
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assert(dofile("../lua/http.lua"))
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-- format a number of bytes per second into a human readable form
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function strbps(b)
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local l = "B/s"
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if b > 1024 then
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b = b / 1024
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l = "KB/s"
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if b > 1024 then
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b = b / 1024
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l = "MB/s"
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if b > 1024 then
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b = b / 1024
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l = "GB/s" -- hmmm
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-- formats a number of seconds into human readable form
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function nicetime(s)
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local l = "s"
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if s > 60 then
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s = s / 60
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l = "m"
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if s > 60 then
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s = s / 60
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l = "h"
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if s > 24 then
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s = s / 24
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l = "d" -- hmmm
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end
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end
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end
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return format("%.2f%s ", b, l)
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if l == "s" then return format("%2.0f%s", s, l)
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else return format("%5.2f%s", s, l) end
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end
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-- formats a number of bytes into human readable form
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function nicesize(b)
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local l = "B"
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if b > 1024 then
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b = b / 1024
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l = "KB"
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if b > 1024 then
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b = b / 1024
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l = "MB"
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if b > 1024 then
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b = b / 1024
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l = "GB" -- hmmm
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end
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end
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end
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return format("%7.2f%2s", b, l)
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end
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-- returns a string with the current state of the download
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function gauge(got, dt, size)
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local rate = got / dt
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if size and size >= 1 then
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return format("%s received, %s/s throughput, " ..
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"%.0f%% done, %s remaining",
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nicesize(got),
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nicesize(rate),
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100*got/size,
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nicetime((size-got)/rate))
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else
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return format("%s received, %s/s throughput, %s elapsed",
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nicesize(got),
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nicesize(rate),
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nicetime(dt))
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end
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end
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-- creates a new instance of a receive_cb that saves to disk
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-- kind of copied from luasocket's manual callback examples
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function receive2disk(file)
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function receive2disk(file, size)
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local aux = {
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start = _time(),
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got = 0,
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file = openfile(file, "wb")
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file = openfile(file, "wb"),
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size = size
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}
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local receive_cb = function(chunk, err)
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local dt = _time() - %aux.start -- elapsed time since start
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@ -39,62 +79,69 @@ function receive2disk(file)
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write(%aux.file, chunk)
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%aux.got = %aux.got + strlen(chunk) -- total bytes received
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if dt < 0.1 then return 1 end -- not enough time for estimate
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local rate = %aux.got / dt -- get download rate
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write("\r" .. strbps(rate)) -- print estimate
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write("\r", gauge(%aux.got, dt, %aux.size))
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return 1
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end
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return receive_cb
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end
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-- stolen from http implementation
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function split_url(url, default)
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-- initialize default parameters
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local parsed = default or {}
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-- get scheme
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url = gsub(url, "^(.+)://", function (s) %parsed.scheme = s end)
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-- get user name and password. both can be empty!
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-- moreover, password can be ommited
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url = gsub(url, "^([^@:/]*)(:?)([^:@/]-)@", function (u, c, p)
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%parsed.user = u
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-- there can be an empty password, but the ':' has to be there
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-- or else there is no password
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%parsed.pass = nil -- kill default password
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if c == ":" then %parsed.pass = p end
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end)
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-- get host
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url = gsub(url, "^([%w%.%-]+)", function (h) %parsed.host = h end)
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-- get port if any
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url = gsub(url, "^:(%d+)", function (p) %parsed.port = p end)
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-- whatever is left is the path
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if url ~= "" then parsed.path = url end
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return parsed
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end
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-- stolen from http implementation
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function get_statuscode(line)
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local _,_, code = strfind(line, " (%d%d%d) ")
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return tonumber(code)
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end
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-- downloads a file using the ftp protocol
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function getbyftp(url, file)
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local err = ftp_getindirect(url, receive2disk(file), "b")
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if err then print(err) else print("done.") end
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local err = FTP.get_cb {
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url = url,
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content_cb = receive2disk(file),
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type = "i"
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}
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print()
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if err then print(err) end
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end
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function getbyhttp(url, file)
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local hdrs, line, err = http_getindirect(url, receive2disk(file))
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if line and get_statuscode(line) == 200 then print("done.")
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elseif line then print(line) else print(err) end
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-- downloads a file using the http protocol
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function getbyhttp(url, file, size)
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local response = HTTP.request_cb(
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{url = url},
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{body_cb = receive2disk(file, size)}
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)
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print()
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if response.code ~= 200 then print(response.status or response.error) end
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end
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function get(url, file)
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local parsed = split_url(url)
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if parsed.scheme == "ftp" then getbyftp(url, file)
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else getbyhttp(url, file) end
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-- determines the size of a http file
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function gethttpsize(url)
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local response = HTTP.request {
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method = "HEAD",
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url = url
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}
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if response.code == 200 then
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return tonumber(response.headers["content-length"])
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end
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end
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-- determines the scheme and the file name of a given url
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function getschemeandname(url, name)
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-- this is an heuristic to solve a common invalid url poblem
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if not strfind(url, "//") then url = "//" .. url end
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local parsed = URL.parse_url(url, {scheme = "http"})
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if name then return parsed.scheme, name end
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local segment = URL.parse_path(parsed.path)
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name = segment[getn(segment)]
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if segment.is_directory then name = nil end
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return parsed.scheme, name
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end
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-- gets a file either by http or url, saving as name
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function get(url, name)
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local scheme
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scheme, name = getschemeandname(url, name)
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if not name then print("unknown file name")
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elseif scheme == "ftp" then getbyftp(url, name)
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elseif scheme == "http" then getbyhttp(url, name, gethttpsize(url))
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else print("unknown scheme" .. scheme) end
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end
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-- main program
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arg = arg or {}
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if getn(arg) < 2 then
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write("Usage:\n luasocket -f get.lua <remote-url> <local-file>\n")
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if getn(arg) < 1 then
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write("Usage:\n luasocket -f get.lua <remote-url> [<local-file>]\n")
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exit(1)
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else get(arg[1], arg[2]) end
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