lerna-changelog making a request to github api for each PR

[issammani]

We have been using lerna-changelog internally at work to keep our changelog up to date. What we have noticed lately is that the github api rate limit is being exceeded.

Some metrics:

• Github API rate limit: 5000 api calls
• Number of PRs: ~300 PRs
• Number of API calls lerna-changelog makes per run: ~500 api calls

If we run the changelog generation process more than 9 times within an hour we exceed the limit. This is due to the fact, that the code is making an api call (fetch) for each PR.

lerna-changelog/src/changelog.ts

Lines 152 to 166 in eb20411

	private async downloadIssueData(commitInfos: CommitInfo[]) {
	progressBar.init("Downloading issue information…", commitInfos.length);
	await pMap(
	commitInfos,
	async (commitInfo: CommitInfo) => {
	if (commitInfo.issueNumber) {
	commitInfo.githubIssue = await this.github.getIssueData(this.config.repo, commitInfo.issueNumber);
	}
	progressBar.tick();
	},
	{ concurrency: 5 }
	);
	progressBar.terminate();
	}

I couldn't find anything related to this in the docs. Is this the expected behaviour ?

[Turbo87]

this is the expected behavior, but it should use an on-disk HTTP cache and AFAIK cache hits don't count towards that API request limit.

an alternative might be to use the GraphQL API of GitHub, but that needs further investigation.