ship logs to http endpoint #1228
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James-Pickett
commented
Jun 13, 2023
•
James-Pickett
commented
- adds a new logger "LogShipper" that gets added via TeeLogger at launcher startup
- LogShipper ship logs on an interval using endpoint and token provided by control server or flags
- updates tracing code to use "TraceIngestURL" flag and LogShipper to use "LogIngestUrl"
James-Pickett
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This looks pretty clean, I think it'll be easy to play with.
I've been stalling on #1183 but I think it would be easy to integrate this with it
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Don’t use the db. Memory is fine. But the buffer and flush a batch makes
sense.
…On Wed, Jun 14, 2023 at 09:08 James Pickett ***@***.***> wrote:
***@***.**** commented on this pull request.
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In pkg/log/httpbuffer/httpbuffer.go
<#1228 (comment)>:
> +}
+
+func (hb *httpBuffer) Write(p []byte) (n int, err error) {
+ hb.bufMutex.Lock()
+ defer hb.bufMutex.Unlock()
+
+ if hb.buf.Len() > hb.maxSize {
+ // just drop our logs on the floor and start over
+ hb.logger.Log("msg", "buffer is full, dropping logs", "size", hb.buf.Len())
+ hb.buf.Reset()
+ }
+
+ n, err = hb.buf.Write(p)
+
+ // only try to send if we're at send size and not currently sending
+ if hb.buf.Len() >= hb.sendSize && hb.sendMutex.TryLock() {
In that code it looks like we write to the db, then periodically flush and
purge. Are you thinking we should also back the http sending logger with
the db or is in memory okay? I guess the advantage of being db backed is
that it would persist through crashes ... starting to talk myself into it.
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cmd/launcher/launcher.go
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| @@ -148,8 +148,9 @@ func runLauncher(ctx context.Context, cancel func(), opts *launcher.Options) err | |||
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| // Need to set up the log shipper so that we can get the logger early | |||
| // and pass it to the various systems. | |||
| isShippingLogs := k.ObservabilityIngestServerURL() != "" | |||
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Probably okay to start with it. Interesting question is whether it's possible to enable/disable/change the URL from the control server
pkg/log/logshipper/logshipper.go
Outdated
| if !ls.knapsack.LogShippingEnabled() { | ||
| return nil | ||
| } |
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I cannot remember -- how performant is this? Vs storing a boolean on logshipper and registering it?
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I think the values are cached, but just to be safe, I'll store the boolean on log shipper
pkg/log/logshipper/logshipper.go
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| token, _ := ls.knapsack.TokenStore().Get(observabilityIngestTokenKey) | ||
| ls.sender.authtoken = string(token) | ||
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| endpoint, err := logEndpoint(ls.knapsack) |
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Wouldn't you need to implement FlagsChanged(flagKeys ...keys.FlagKey) and call knapsack.RegisterChangeObserver to get agent flags (i.e. LogIngestServerURL) updates on time?
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I kinda took the lazy rout and just subscribed to all agent_flags updates, felt easier to just handle all the control server updates in Ping(), however if I'm willing to change it if you think it would be cleaner.
https://github.com/James-Pickett/launcher/blob/james/log-shipping/cmd/launcher/launcher.go#L324
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I think I have a slight preference for doing it consistently the same way everywhere. But maybe the best way is to do everything in Ping like you've got it here? Maybe can chat about it later, I'm fine with this as-is regardless
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I think you're right that we should come up with some patterns for doing this consistently. But I don't know what it'll be yet.
