twitter-api

This is a Clojure library for accessing the Twitter API using http.async.client.

It endeavors to implement all Twitter APIs:

It is tested by interacting with the live Twitter API.

Why did I make this library?

I felt the current offerings were a bit out of date
I wanted the efficiency of the async comms libraries
I needed some stuff from the headers returned by twitter (i.e. the rate-limiting stuff and etag)
I wanted full API coverage (restful, streaming and search)

Giants upon whose shoulders I have stood

http.async.client by Hubert Iwaniuk
clj-oauth by Matt Revelle

Leiningen

twitter-api is published on Clojars. Add the following to your project.clj's :dependencies:

[twitter-api "1.8.0"]

Usage

All of the functions follow Twitter's naming conventions; we convert a resource's path into the function name. For example:

https://api.twitter.com/1.1/account/settings is available as account-settings
https://api.twitter.com/1.1/statuses/update_with_media is available as statuses-update-with-media

Parameters are uniform across the functions. All calls accept:

:oauth-creds is the result of the make-oauth-creds function.
:params is a map of parameters to pass, e.g., ?list_id=123 would be {:list-id 123}
:headers adds or overrides any of the request headers sent to Twitter.
:verb overrides the HTTP verb used to make the request, for resources that support it (e.g., account-settings)
:callbacks attaches a custom callback to the request.

All of the API calls return the full HTTP response, including headers, so in most cases you will want to get the response's :body value.

Examples

RESTful calls

(ns mynamespace
  (:use [twitter.oauth]
        [twitter.callbacks]
        [twitter.callbacks.handlers]
        [twitter.api.restful])
  (:import [twitter.callbacks.protocols SyncSingleCallback]))

(def my-creds (make-oauth-creds *app-consumer-key*
                                *app-consumer-secret*
                                *user-access-token*
                                *user-access-token-secret*))

; simply retrieves the user, authenticating with the above credentials
; note that anything in the :params map gets the -'s converted to _'s
(users-show :oauth-creds my-creds :params {:screen-name "AdamJWynne"})

; supplying a custom header
(users-show :oauth-creds my-creds :params {:screen-name "AdamJWynne"} :headers {:x-blah-blah "value"})

; shows the users friends
(friendships-show :oauth-creds my-creds
                  :params {:target-screen-name "AdamJWynne"})

; use a custom callback function that only returns the body of the response
(friendships-show :oauth-creds my-creds
                  :callbacks (SyncSingleCallback. response-return-body
                                                  response-throw-error
                                                  exception-rethrow)
                  :params {:target-screen-name "AdamJWynne"})

; post a text status, using the default sync-single callback
(statuses-update :oauth-creds my-creds
                 :params {:status "hello world"})

; upload a picture tweet with a text status attached, using the default sync-single callback
; (this method has been deprecated by twitter.)
(statuses-update-with-media :oauth-creds my-creds
                            :body [(file-body-part "/pics/test.jpg")
                                   (status-body-part "testing")])

;; upload a picture tweet.
(let [media-id (-> (media-upload-chunked :oauth-creds my-creds
                                         :media "/pics/test.jpg"
                                         :media-type "image/jpeg")
                   :body
                   :media_id)]
  (statuses-update :oauth-creds my-creds :params {:status "hi!" :media-ids [media-id]}))

;; upload a video tweet.
(let [media-id (-> (media-upload-chunked :oauth-creds my-creds
                                         :media "/vids/test.mp4"
                                         :media-type "video/mp4")
                   :body
                   :media_id)]
  (statuses-update :oauth-creds my-creds :params {:status "hi!" :media-ids [media-id]}))

Streaming calls

(ns mynamespace
  (:use [twitter.oauth]
        [twitter.callbacks]
        [twitter.callbacks.handlers]
        [twitter.api.streaming])
  (:require [clojure.data.json :as json]
            [http.async.client :as ac])
  (:import [twitter.callbacks.protocols AsyncStreamingCallback]))

(def my-creds (make-oauth-creds *app-consumer-key*
                                *app-consumer-secret*
                                *user-access-token*
                                *user-access-token-secret*))

; retrieves the user stream, waits 1 minute and then cancels the async call
(def ^:dynamic *response* (user-stream :oauth-creds my-creds))
(Thread/sleep 60000)
((:cancel (meta *response*)))

; supply a callback that only prints the text of the status
(def ^:dynamic
     *custom-streaming-callback*
     (AsyncStreamingCallback. (comp println #(:text %) json/read-json #(str %2))
                              (comp println response-return-everything)
                              exception-print))

(statuses-filter :params {:track "Borat"}
                 :oauth-creds my-creds
                 :callbacks *custom-streaming-callback*)

Notes on making API calls

Unlike other APIs, the parameters for each call are not hard-coded into their Clojure wrappers. I just figured that you could look them up on the dev.twitter.com/docs and supply them in the :params map.
You can authenticate or not, by including or omitting the :oauth-creds keyword and value. The value should be a twitter.oauth.OauthCredentials structure (usually the result of the twitter.oauth/make-oauth-creds function)
The callbacks decide how the call will be carried out - be it a single or streaming call, or an async or sync call. Read twitter.callbacks.protocols to see how it works
You can declare new methods that use different callbacks by either supplying them to the def-twitter-method macro, or inline at run time (via the :callbacks key/value), or both!
Unless you supply a :client my-client pair, the library will use a memoized client. This normally won't be a problem if you don't need to exit gracefully (i.e., without (System/exit 0) or Ctrl-C), but otherwise may cause your program to hang unexpectedly. To avoid this, you must do a bit more bookkeeping, via either one of these workarounds:
1. Create and close your own client:
```
(with-open [client (http.async.client/create-client)]
  (users-show :client client :oauth-creds my-creds :params {:screen-name "AdamJWynne"}))
```
2. When you're done making API calls, close the memoized client:
```
(http.async.client/close (twitter.core/default-client))
```

Building

Use leiningen to build the library into a jar with:

$ git clone git://github.com/adamwynne/twitter-api.git
Cloning into twitter-api...
remote: Counting objects: 167, done.
remote: Compressing objects: 100% (115/115), done.
remote: Total 167 (delta 68), reused 125 (delta 26)
Receiving objects: 100% (167/167), 33.60 KiB, done.
Resolving deltas: 100% (68/68), done.
$ cd twitter-api/
$ lein jar

Which produces a jar file at target/twitter-api-*.jar.

Testing

The tests require that credentials be provided via environment variables with the following names:

export CONSUMER_KEY=l4VAFAKEFAKEFAKEpy7R7
export CONSUMER_SECRET=dVnTimJtFAKEFAKEFAKEFAKEFAKEFAKEBVYnO91BR1G
export SCREEN_NAME=twitterapibot
export ACCESS_TOKEN=195648015-OIHb87zuFAKEFAKEFAKEFAKEFAKEFAKEb5aLUMYo
export ACCESS_TOKEN_SECRET=jsVg1HFAKEFAKEFAKEFAKEFAKEFAKE4yfOLC5cXA9fcXr

Then simply run lein test, which takes about a minute since many of the tests involve calling the Twitter API and waiting for an appropriate response.

If all tests completed successfully, the test output will end with a message like:

Ran 47 tests containing 123 assertions.
0 failures, 0 errors.

License

This library made open-source by StreamScience

Follow @AdamJWynne and @StreamScience to save kittens and make rainbows.

Distributed under the Eclipse Public License, the same as Clojure.

adamwynne/twitter-api

adamwynne

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