/// <summary>
/// Checks if a given <paramref name="pullRequest"/> is considered mergeable and does so if need be and sets it's commit status
/// </summary>
/// <param name="pullRequest">The <see cref="PullRequest"/> to check</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
/// <returns>A <see cref="Task"/> representing the running operation</returns>
async Task CheckMergePullRequest(PullRequest pullRequest, CancellationToken cancellationToken)
{
using (logger.BeginScope("Checking mergability of pull request #{0}.", pullRequest.Number))
{
bool merge = true;
string mergerToken = null;
int rescheduleIn = 0;
Task pendingStatusTask = null;
try
{
pendingStatusTask = gitHubManager.SetCommitStatus(pullRequest, CommitState.Pending, stringLocalizer["CommitStatusPending"]);
for (var I = 0; I < 4 && !pullRequest.Mergeable.HasValue; ++I)
{
await Task.Delay(I * 1000, cancellationToken).ConfigureAwait(false);
logger.LogTrace("Rechecking git mergeablility.");
pullRequest = await gitHubManager.GetPullRequest(pullRequest.Number).ConfigureAwait(false);
}
if (!pullRequest.Mergeable.HasValue || !pullRequest.Mergeable.Value)
{
logger.LogDebug("Aborted due to lack of mergeablility: {0}", pullRequest.Mergeable);
return;
}
var tasks = new List <Task <AutoMergeStatus> >();
foreach (var I in componentProvider.MergeRequirements)
{
tasks.Add(I.EvaluateFor(pullRequest, cancellationToken));
}
await Task.WhenAll(tasks).ConfigureAwait(false);
bool goodStatus = true;
var failReasons = new List <string>();
foreach (var I in tasks.Select(x => x.Result))
{
if (I.Progress < I.RequiredProgress && merge)
{
logger.LogDebug("Aborting merge due to status failure: {0}/{1}", I.Progress, I.RequiredProgress);
merge = false;
if (I.FailStatusReport)
{
goodStatus = false;
failReasons.AddRange(I.Notes);
}
}
if (I.ReevaluateIn > 0)
{
if (rescheduleIn == 0)
{
rescheduleIn = I.ReevaluateIn;
}
else
{
rescheduleIn = Math.Min(rescheduleIn, I.ReevaluateIn);
}
}
if (I.MergerAccessToken != null)
{
if (mergerToken != null)
{
throw new InvalidOperationException("Multiple AutoMergeResults with MergerAccessTokens!");
}
mergerToken = I.MergerAccessToken;
}
}
var failReasonMessage = String.Empty;
foreach (var I in failReasons)
{
failReasonMessage = String.Format(CultureInfo.InvariantCulture, "{0}{1} - {2}", failReasonMessage, Environment.NewLine, I);
}
await pendingStatusTask.ConfigureAwait(false);
await gitHubManager.SetCommitStatus(pullRequest, goodStatus?CommitState.Success : CommitState.Failure, goodStatus?stringLocalizer["CommitStatusSuccess"] : stringLocalizer["CommitStatusFail", failReasonMessage]).ConfigureAwait(false);
}
catch (Exception e)
{
if (pendingStatusTask.Exception != null && pendingStatusTask.Exception != e)
{
logger.LogError(e, "Error setting pending status!");
}
logger.LogDebug(e, "Error occurred. Setting commit state to errored.");
try
{
await gitHubManager.SetCommitStatus(pullRequest, CommitState.Error, stringLocalizer["CommitStatusError", e]).ConfigureAwait(false);
}
catch (Exception e2)
{
logger.LogError(e2, "Unable to create error status!");
}
throw;
}
if (merge)
{
if (mergerToken == null)
{
logger.LogWarning("Not merging due to lack of provided merger token!");
}
else
{
await MergePullRequest(pullRequest, mergerToken, cancellationToken).ConfigureAwait(false);
return;
}
}
if (rescheduleIn > 0)
{
var targetTime = DateTimeOffset.UtcNow.AddSeconds(rescheduleIn);
BackgroundJob.Schedule(() => RecheckPullRequest(pullRequest.Number, JobCancellationToken.Null), targetTime);
logger.LogDebug("Pull request recheck scheduled for {0}.", targetTime);
}
else
{
logger.LogTrace("Not rescheduling pull request check.");
}
}
}