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Use a JS only tail implementation#201

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teid wants to merge 1 commit intomthenw:masterfrom
teid:useJsTail
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Use a JS only tail implementation#201
teid wants to merge 1 commit intomthenw:masterfrom
teid:useJsTail

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@teid
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@teid teid commented Mar 21, 2020 •
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In order to have the same behaviour between Linux and Windows (related to this issue: #197), I've switched to a lib that provide a JS only tail

This is still a work in progress, I still have to test it on Windows server, but I don't have it right now.

  • During a file rotation, we may loose couple of lines (until the retry). The native tail handle this in a better way though.
  • When we tail multiple files, tail has a syntax to display it:
test1.log sam. 21 mars 2020 17:54:08 CET
test1.log sam. 21 mars 2020 17:54:10 CET
test1.log sam. 21 mars 2020 17:54:11 CET
==> ../frontail/logs/test2.log <==
test2.log sam. 21 mars 2020 17:54:15 CET
test2.log sam. 21 mars 2020 17:55:04 CET
test2.log sam. 21 mars 2020 17:55:10 CET
test2.log sam. 21 mars 2020 17:55:12 CET
==> ../frontail/logs/test1.log <==
test1.log sam. 21 mars 2020 17:55:14 CET
test1.log sam. 21 mars 2020 17:55:17 CET
test1.log sam. 21 mars 2020 17:55:38 CET
test1.log sam. 21 mars 2020 17:55:47 CET

With this implementation, it's difficult to reproduce the same, so I changed the output (also, I allowed stdin to be followed along with other files):

../frontail/logs/test1.log - test1.log sam. 21 mars 2020 17:54:08 CET
../frontail/logs/test1.log - test1.log sam. 21 mars 2020 17:54:10 CET
../frontail/logs/test1.log - test1.log sam. 21 mars 2020 17:54:11 CET
../frontail/logs/test2.log - test2.log sam. 21 mars 2020 17:54:15 CET
                     stdin - stdin.log sam. 21 mars 2020 17:54:19 CET
                     stdin - stdin.log sam. 21 mars 2020 17:54:59 CET
                     stdin - stdin.log sam. 21 mars 2020 17:55:01 CET
                     stdin - stdin.log sam. 21 mars 2020 17:55:02 CET
../frontail/logs/test2.log - test2.log sam. 21 mars 2020 17:55:10 CET
../frontail/logs/test2.log - test2.log sam. 21 mars 2020 17:55:12 CET
../frontail/logs/test1.log - test1.log sam. 21 mars 2020 17:55:17 CET

Let me know what do you think about it :)

teid
teid commented Mar 21, 2020
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lib/tail.js Outdated
}
});

function readLastLinesIfPossible(path, onLineCb) {
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@teid teid Mar 21, 2020

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I had to add this function, because the native tail does it. But the JS lib does not

teid
teid commented Mar 21, 2020
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@teid teid force-pushed the useJsTail branch 2 times, most recently from 680d9c9 to fc35ea6 Compare March 22, 2020 14:37
@mthenw
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mthenw commented Mar 31, 2020

@teid is it ready to be reviewed?

@teid
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teid commented Apr 1, 2020

Yes @mthenw, I validated that this change fixes the issue I had on the Windows server

@kubawolanin
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kubawolanin commented Jun 20, 2021

Does this look mergeable @mthenw?
For me branch with @teid's work (thank you!) is the only way allowing me to use frontail with multiple files on Windows server.
Cheers

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3 participants

@teid @mthenw @kubawolanin