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

[Issam Mani]

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 ?

[Tobias Bieniek]

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.