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sjson-streaming.lua
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sjson-streaming.lua
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-- Test sjson and GitHub API
local s = tls.createConnection()
s:on("connection", function(sck, c)
sck:send("GET /repos/nodemcu/nodemcu-firmware/git/trees/master HTTP/1.0\r\nUser-agent: nodemcu/0.1\r\nHost: api.github.com\r\nConnection: close\r\nAccept: application/json\r\n\r\n")
end)
function startswith(String, Start)
return string.sub(String, 1, string.len(Start)) == Start
end
local seenBlank = false
local partial
local wantval = { tree = 1, path = 1, url = 1 }
-- Make an sjson decoder that only keeps certain fields
local decoder = sjson.decoder({
metatable =
{
__newindex = function(t, k, v)
if wantval[k] or type(k) == "number" then
rawset(t, k, v)
end
end
}
})
local function handledata(s)
decoder:write(s)
end
-- The receive callback is somewhat gnarly as it has to deal with find the end of the header
-- and having the newline sequence split across packets
s:on("receive", function(sck, c)
if partial then
c = partial .. c
partial = nil
end
if seenBlank then
handledata(c)
return
end
while c do
if startswith(c, "\r\n") then
seenBlank = true
c = c:sub(3)
handledata(c)
return
end
local s, e = c:find("\r\n")
if s then
-- Throw away line
c = c:sub(e + 1)
else
partial = c
c = nil
end
end
end)
local function getresult()
local result = decoder:result()
-- This gets the resulting decoded object with only the required fields
print(result['tree'][4]['path'], "is at",
result['tree'][4]['url'])
end
s:on("disconnection", getresult)
s:on("reconnection", getresult)
-- Make it all happen!
s:connect(443, "api.github.com")