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Improve github pull request call retries #1810

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merged 2 commits into from
Oct 4, 2021
Merged

Improve github pull request call retries #1810

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7174af4
Improve github pull request call retries
aristocrates Sep 15, 2021
32b0509
Fix style with gofmt -s
aristocrates Sep 15, 2021
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13 changes: 8 additions & 5 deletions server/events/vcs/github_client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -288,10 +288,14 @@ func (g *GithubClient) GetPullRequest(repo models.Repo, num int) (*github.PullRe

// GitHub has started to return 404's here (#1019) even after they send the webhook.
// They've got some eventual consistency issues going on so we're just going
// to retry up to 3 times with a 1s sleep.
numRetries := 3
retryDelay := 1 * time.Second
for i := 0; i < numRetries; i++ {
// to attempt up to 5 times with exponential backoff.
maxAttempts := 5
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(first attempt technically isn't a retry so I changed the var names to use attempt)

attemptDelay := 0 * time.Second
for i := 0; i < maxAttempts; i++ {
// First don't sleep, then sleep 1, 3, 7, etc.
time.Sleep(attemptDelay)
attemptDelay = 2 * attemptDelay + 1 * time.Second

pull, _, err = g.client.PullRequests.Get(g.ctx, repo.Owner, repo.Name, num)
if err == nil {
return pull, nil
Expand All @@ -300,7 +304,6 @@ func (g *GithubClient) GetPullRequest(repo models.Repo, num int) (*github.PullRe
if !ok || ghErr.Response.StatusCode != 404 {
return pull, err
}
time.Sleep(retryDelay)
}
return pull, err
}
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