gh-106217: Truncate the issue body size of new-bugs-announce-notifier

[sobolevn]

• Issue: new-bugs-announce notifier workflow fails on large bug reports #106217

[hugovk]

See also python/core-workflow#456.

[jkloth]

It seems that now there is no body for any message sent via the notifier after this change. See the new-bugs-announce archives for issue 106333 (has body) vs 106334 (no body)

[hugovk]

Aha, looking at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring, the args are:

substring(indexStart)
substring(indexStart, indexEnd)

indexStart
The index of the first character to include in the returned substring.

indexEnd Optional
The index of the first character to exclude from the returned substring.

So:

issue.data.body.substring(8000)

is attempting to get the substring from char number 8000 up to the end, meaning we lose the first 8000 chars, and get an empty string if there's nothing beyond that. For example:

const str = 'Mozilla';
console.log(str.substring(4));
// prints "lla"
console.log(str.substring(8000));
// prints ""

Instead we want something like issue.data.body.substring(0, 8000) for the substring from 0 up to 8000.

console.log(str.substring(0, 4));
// "Mozi"
console.log(str.substring(0, 8000));
// "Mozilla"

Does that look right? Would you like to make a new PR?

[sobolevn]

Oh my, js strikes again 🤦