78 lines
2.1 KiB
Lua
78 lines
2.1 KiB
Lua
--
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-- If you have the LFS _init loaded then you invoke the provision by
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-- executing LFS.HTTP_OTA('your server','directory','image name'). Note
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-- that is unencrypted and unsigned. But the loader does validate that
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-- the image file is a valid and complete LFS image before loading.
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--
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local host, dir, image = ...
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local doRequest, firstRec, subsRec, finalise
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local n, total, size = 0, 0
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doRequest = function(sk,hostIP)
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if hostIP then
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local con = net.createConnection(net.TCP,0)
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con:connect(80,hostIP)
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-- Note that the current dev version can only accept uncompressed LFS images
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con:on("connection",function(sck)
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local request = table.concat( {
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"GET "..dir..image.." HTTP/1.1",
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"User-Agent: ESP8266 app (linux-gnu)",
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"Accept: application/octet-stream",
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"Accept-Encoding: identity",
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"Host: "..host,
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"Connection: close",
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"", "", }, "\r\n")
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print(request)
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sck:send(request)
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sck:on("receive",firstRec)
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end)
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end
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end
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firstRec = function (sck,rec)
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-- Process the headers; only interested in content length
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local i = rec:find('\r\n\r\n',1,true) or 1
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local header = rec:sub(1,i+1):lower()
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size = tonumber(header:match('\ncontent%-length: *(%d+)\r') or 0)
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print(rec:sub(1, i+1))
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if size > 0 then
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sck:on("receive",subsRec)
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file.open(image, 'w')
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subsRec(sck, rec:sub(i+4))
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else
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sck:on("receive", nil)
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sck:close()
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print("GET failed")
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end
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end
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subsRec = function(sck,rec)
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total, n = total + #rec, n + 1
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if n % 4 == 1 then
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sck:hold()
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node.task.post(0, function() sck:unhold() end)
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end
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uart.write(0,('%u of %u, '):format(total, size))
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file.write(rec)
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if total == size then finalise(sck) end
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end
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finalise = function(sck)
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file.close()
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sck:on("receive", nil)
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sck:close()
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local s = file.stat(image)
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if (s and size == s.size) then
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wifi.setmode(wifi.NULLMODE)
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collectgarbage();collectgarbage()
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-- run as separate task to maximise RAM available
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node.task.post(function() node.flashreload(image) end)
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else
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print"Invalid save of image file"
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end
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end
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net.dns.resolve(host, doRequest)
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