Twitter client library for Elixir. It uses OAuther to call Twitter's REST API v1.1.
It only supports very limited set of functions yet. Refer to lib/extwitter.ex and test/extwitter_test.exs for available functions and examples.
The package can be installed by adding :extwitter to your list of
dependencies in mix.exs:
By default, ExTwitter uses OAuther and Jason library to call Twitter's REST API.
defp deps do
[
{:oauther, "~> 1.1"},
{:jason, "~> 1.1"},
{:extwitter, "~> 0.12"}
]
endRefer to Twitter API doc for the detail.
The default behaviour is to configure using the application environment:
In config/config.exs, add:
config :extwitter, :oauth, [
consumer_key: "",
consumer_secret: "",
access_token: "",
access_token_secret: ""
]Or manually at runtime through ExTwitter.configure/1:
iex> ExTwitter.configure([consumer_key: "", ...])You can also configure the current process only:
iex> ExTwitter.configure(:process, [consumer_key: "", ...])You can also customize it to use another library via the :json_library
configuration:
config :extwitter, :json_library, PoisonProxy for accessing twitter server can be configured as follows:
config :extwitter, :proxy, [
server: "www-proxy.mycompany.com",
port: 8000,
user: "user",
password: "password"
]Sample execution on IEx.
$ iex -S mix
Interactive Elixir - press Ctrl+C to exit (type h() ENTER for help)ExTwitter.configure(
consumer_key: System.get_env("TWITTER_CONSUMER_KEY"),
consumer_secret: System.get_env("TWITTER_CONSUMER_SECRET"),
access_token: System.get_env("TWITTER_ACCESS_TOKEN"),
access_token_secret: System.get_env("TWITTER_ACCESS_SECRET")
)Example for authentication (Sign-in with twitter).
Authorization (3-legged authorization) uses the same workflow, just swap :authenticate_url for :authorize_url where indicated.
# Request twitter for a new token
token = ExTwitter.request_token("http://myapp.com/twitter-callback")
# Generate the url for "Sign-in with twitter".
# For "3-legged authorization" use ExTwitter.authorize_url instead
{:ok, authenticate_url} = ExTwitter.authenticate_url(token.oauth_token)
# Copy the url, paste it in your browser and authenticate
IO.puts authenticate_urlAfter sign-in you will be redirected to the callback URL you configured for your app. Get the tokens from the URL's query:
https://myapp.com/twitter-callback?oauth_token=<TOKEN>&oauth_verifier=<VERIFIER>
Copy the oauth_token and oauth_verifier query strings from the URL and use
it in the IEx snippet below.
oauth_token = "<TOKEN>"
oauth_verifier = "<VERIFIER>"
# Exchange for an access token
{:ok, access_token} = ExTwitter.access_token(oauth_verifier, oauth_token)
# Configure ExTwitter to use your newly obtained access token
ExTwitter.configure(
consumer_key: System.get_env("TWITTER_CONSUMER_KEY"),
consumer_secret: System.get_env("TWITTER_CONSUMER_SECRET"),
access_token: access_token.oauth_token,
access_token_secret: access_token.oauth_token_secret
)
ExTwitter.user_timelineExample for normal API.
iex> ExTwitter.search("elixir-lang", [count: 5]) |>
Enum.map(fn(tweet) -> tweet.text end) |>
Enum.join("\n-----\n") |>
IO.puts
# => Tweets will be displayed in the console as follows.
@xxxx have you tried this yet?
-----
@yyyy You mean this? http://t.co/xxxx That had sailed below my radar thus far.
-----
@zzzz #elixir-lang. I'm jadams
-----
Akala ko 100 nalang kulang ko sa dark elixir para sa Barb King summoner level.
-----
@aaaa usually kasi magbbuzz lang yan pag luma na string. talaga ang elixir.Example for streaming API.
stream = ExTwitter.stream_filter(track: "apple") |>
Stream.map(fn(x) -> x.text end) |>
Stream.map(fn(x) -> IO.puts "#{x}\n---------------\n" end)
Enum.to_list(stream)
# => Tweets will be displayed in the console as follows.
Apple 'iWatch' rumour round-up
---------------
Apple iPhone 4s 16GB Black Verizon - Cracked Screen, WORKS PERFECTLY!
---------------
Apple iPod nano 7th Generation (PRODUCT) RED (16 GB) (Latest Model) - Full read by
---------------
...
The ExTwitter.stream_control/2 function to send a message to stop the stream.
# An example to stop receiving stream after 5 seconds passed.
pid = spawn(fn ->
stream = ExTwitter.stream_filter(track: "apple")
for tweet <- stream do
IO.puts tweet.text
end
end)
:timer.sleep(5000)
ExTwitter.stream_control(pid, :stop)Twitter returns several streaming message types. These messages are returned when :receive_messages option is specified.
stream = ExTwitter.stream_sample(receive_messages: true)
for message <- stream do
case message do
tweet = %ExTwitter.Model.Tweet{} ->
IO.puts "tweet = #{tweet.text}"
deleted_tweet = %ExTwitter.Model.DeletedTweet{} ->
IO.puts "deleted tweet = #{deleted_tweet.status[:id]}"
limit = %ExTwitter.Model.Limit{} ->
IO.puts "limit = #{limit.track}"
stall_warning = %ExTwitter.Model.StallWarning{} ->
IO.puts "stall warning = #{stall_warning.code}"
_ ->
IO.inspect message
end
endSome of Twitter API have paging capability for retrieving large number of items through cursor. The following is an example to iteratively call the API to fetch all the items.
defmodule Retriever do
def follower_ids(screen_name, acc \\ [], cursor \\ -1) do
cursor = fetch_next(screen_name, cursor)
if Enum.count(cursor.items) == 0 do
List.flatten(acc)
else
follower_ids(screen_name, [cursor.items|acc], cursor.next_cursor)
end
end
defp fetch_next(screen_name, cursor) do
try do
ExTwitter.follower_ids(screen_name, cursor: cursor)
rescue
e in ExTwitter.RateLimitExceededError ->
:timer.sleep ((e.reset_in + 1) * 1000)
fetch_next(screen_name, cursor)
end
end
end
ids = Retriever.follower_ids("TwitterDev")
IO.puts "Follower count for TwitterDev is #{Enum.count(ids)}."
# => Follower count for TwitterDev is 38469.run_iex.sh launches IEx, with initially calling ExTwitter.configure/1 defined
as iex/dot.iex.
$ ./run_iex.sh
Erlang/OTP 17 [erts-6.3] [source] [64-bit] [smp:4:4] [async-threads:10]...
Interactive Elixir (1.0.2) - press Ctrl+C to exit (type h() ENTER for help)
iex> (ExTwitter.search("elixir") |> List.first).textCopyright (c) 2014 parroty
This work is free. You can redistribute it and/or modify it under the terms of the MIT License. See the LICENSE.md file for more details.
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