public static Dictionary <string, GithubActor> GetDistinct(GithubApi githubApi, List <dynamic> githubEvents)
{
var output = new Dictionary <string, GithubActor>();
var logins = githubEvents.Select(e => e.actor.login.Value.ToString()).Distinct().ToList();
foreach (string login in logins)
{
var apiResult = githubApi.GetUser(login);
var actor = new GithubActor()
{
Login = login, Name = apiResult.Data.name.Value
};
output.Add(login, actor);
}
return(output);
}
private static GithubFollowee GetUserFollowees(string username, GithubApi githubApi, string etag)
{
var output = new GithubFollowee();
output.Username = username;
var followeesApiResults = githubApi.GetUserFollowees(username, etag);
if (followeesApiResults.Any() == true)
{
output.Etag = followeesApiResults.First().Etag;
output.Modified = followeesApiResults.First().Modified;
var followees = followeesApiResults.SelectMany(r => r.Data);
output.Followees = followees.Select(u => (string)u.login.Value).Distinct().ToList();
}
return(output);
}
public static void Run(
[TimerTrigger("0 */10 * * * *")] TimerInfo myTimer,
[Blob("data-storage/github.status.json", System.IO.FileAccess.ReadWrite, Connection = "BlobStorageConnection")] CloudBlockBlob githubStatusBlob,
TraceWriter log)
{
log.Info($"C# Timer trigger function executed at: {DateTime.Now}");
// Initialize out API helper class.
// As part of the initialization process, it gets GitHub credentials from app settings and "Last Modified" date from blob storage
var githubApi = new GithubApi(githubStatusBlob);
// Call the GitHub "Received Events" API for the current user and deserialize the JSON that the API sends back
var githubEventsApiResults = githubApi.GetReceivedEvents();
var githubEvents = githubEventsApiResults.SelectMany(r => r.Data).ToList();
// The GitHub "Received Events" API no longer includes follow notices (e.g. Frank is now following Susan)
// However, it would be nice to have that in our feed... so we have to build it ourselves.
// We'll keep track of everyone we follow and who they are following. Then we'll compare the current list of followings
// to what we're tracking. If something has changed (i.e. a following is the list that wasn't there before), we can
// report that as a new event.
// First, get a list of everyone that I am following
var me = GetUserFollowees(githubApi.Configuration.Username, githubApi, githubApi.Status.FolloweesEtag);
var previousFollowees = githubApi.Status.Followees.Select(f => f.Username);
if (me.Modified == false)
{
// My list of followers has not changed since the last run. So just use the old list from the config
me.Followees.AddRange(previousFollowees);
}
else
{
// If my list of followers has changed, it could be because I stopped following someone.
// In that case, we need to remove them from the config so we don't keep tracking them.
// (No need to worry about new additions here. They get handled in the regular processing loop.
var drops = previousFollowees.Except(me.Followees);
githubApi.Status.Followees.RemoveAll(f => drops.Contains(f.Username));
}
// Now loop through all of the I'm following people and get a list of everyone they are following
var followees = new List <GithubFollowee>();
foreach (string username in me.Followees)
{
string etag = "";
var followee = githubApi.Status.Followees.FirstOrDefault(f => f.Username == username);
if (followee != null)
{
etag = followee.Etag;
}
followees.Add(GetUserFollowees(username, githubApi, etag));
}
foreach (var followee in followees)
{
if (githubApi.Status.Followees.Any(f => f.Username == followee.Username) == false)
{
// This is a new person that I'm following. Don't tweet about all of their existings follows...
// Just add them to the list so we can start watching them.
githubApi.Status.Followees.Add(followee);
}
else
{
// For everyone that I've been following, compare their new list of followees to the list that we stored
// Tweet about any changes in the list.
if (followee.Modified == true)
{
var oldFollowee = githubApi.Status.Followees.First(f => f.Username == followee.Username);
var adds = followee.Followees.Except(oldFollowee.Followees).ToList();
var drops = oldFollowee.Followees.Except(followee.Followees).ToList();
// For any changes that we discover, create a "fake" event in our event list
adds.ForEach(i => githubEvents.Add(CreateFakeFollowEvent(followee.Username, "started", i)));
drops.ForEach(i => githubEvents.Add(CreateFakeFollowEvent(followee.Username, "stopped", i)));
// For any changes that we discover, update the status with the changes
oldFollowee.Followees.AddRange(adds);
oldFollowee.Followees.RemoveAll(f => drops.Contains(f));
oldFollowee.Etag = followee.Etag;
}
}
}
// Now that we have followees sorted out, let's continue on with our tweeting...
// Build a hash table of all of the actors mentioned in the "Received Events" feed
// (Note that it makes an API call for each actor to get their details
var actors = GithubActor.GetDistinct(githubApi, githubEvents);
// Loop through all of the items in the data we got from the API. If there's a new item we havent seen before,
// create a new tweet for it.
var tweets = new List <Tweet>();
foreach (var item in githubEvents)
{
if (item.created_at.Value > githubApi.Status.EventsLastModified)
{
var actor = actors[item.actor.login.Value];
var tweet = Tweet.Create(actor, item);
tweets.Add(tweet);
}
}
// Now it's time to send out our tweets!
var twitterConfig = TwitterConfiguration.Retrieve();
var twitterApi = new TwitterApi(twitterConfig);
var tweetResults = new List <dynamic>();
foreach (var tweet in tweets)
{
string resultJson = twitterApi.SendTweet(tweet.CreateBody());
tweetResults.Add(JsonConvert.DeserializeObject <dynamic>(resultJson));
}
// Save the updated status back to blob storage
githubApi.Status.StoreInBlob(githubStatusBlob, githubEventsApiResults, me);
// Report back our results
log.Info($"C# Timer trigger function completed at: {DateTime.Now} - attempted {tweets.Count} tweets");
foreach (var tweetResult in tweetResults)
{
if (tweetResult.errors == null)
{
log.Info($"--- SUCCESS! {tweetResult.text.Value}");
}
else
{
var error = tweetResult.errors.First;
log.Info($"--- FAILED! Code {error.code.Value}: {error.message.Value}");
}
}
}