Lua

Firebase PUT - Writing Data

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Demonstrates how to PUT new data to a Firebase JSON database. The data used in this example is at Chilkat Firebase Pigs Database, and is shown here:

Lua

local chilkat = require("chilkat")

-- Demonstrates how to PUT new data to a Firebase JSON database.

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

-- This example assumes a JWT authentication token, if required, has been previously obtained.
-- See Get Firebase Access Token from JSON Service Account Private Key for sample code.

-- Load the previously obtained Firebase access token into a string.
local fac = chilkat.FileAccess.new()
local accessToken = fac:read_entire_text_file("qa_data/tokens/firebaseToken.txt", "utf-8")
if not fac.last_method_success then
    print(fac.last_error_text)
    return
end

local rest = chilkat.Rest.new()

-- Make the initial connection (without sending a request yet).
-- Once connected, any number of requests may be sent.  It is not necessary to explicitly
-- call Connect before each request.
local success = rest:connect("chilkat.firebaseio.com", 443, true, true)
if not success then
    print(rest.last_error_text)
    return
end

local authGoogle = chilkat.AuthGoogle.new()
authGoogle.access_token = accessToken
rest:set_auth_google(authGoogle)

-- Chilkat's sample data (pig-rescue data) is publicly readable at: https://chilkat.firebaseio.com/.json
-- This data is publicly readable, but not writable.  You'll need to
-- run against your own database..

-- Generate a new push ID.
local prng = chilkat.Prng.new()
local pushId = prng:firebase_push_id()

-- We're going to add a new pig with just the name.
local pigRecord = chilkat.JsonObject.new()
pigRecord:append_string("name", "William")

local path = chilkat.StringBuilder.new()
path:append("/pig-rescue/animal/")
path:append(pushId)
path:append(".json")

-- The string content of the last arg passed is  {"name":"William"}
local jsonResponse = rest:full_request_string("PUT", path:get_as_string(), pigRecord:emit())
if not rest.last_method_success then
    -- Something happened in the communications (either no request was sent, or no response was received.
    -- (The Chilkat REST API also has lower-level methods where an app can send the request in one call,
    -- and then receive the response in another call.)
    print(rest.last_error_text)
    return
end

-- Check the response status code.   A 200 response status indicates success.
if rest.response_status_code ~= 200 then
    print(rest.response_status_text)
    print(jsonResponse)
    print("Failed.")
    return
end

print(jsonResponse)
print("Success.")

-- Note: In many of the Chilkat examples, you may notice strange ways
-- of doing something that should be simpler and shorter.  For example,
-- building the path (above) could've been written differently,
-- with some simple string concatenation.
--
-- The reason is that the Chilkat examples are written in a
-- proprietary "example code" scripting language,
-- and then automatically generated to each of the different programming
-- languages you see on example-code.com.  The code generation is
-- limited in what it can do.  For example, string concatentation
-- is not yet a feature of the "example code" scripting language (as of May 2016),
-- and therefore you won't see the use of a programming language's string
-- concatentation operators in any example.
--