Before this patch, if a splunk endpoint returned a non-OK status, the
splunk driver would read the entire response body. This could lead to
excessive memory allocations. Instead put a cap on the amount the driver
will read from the response body.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Before this change, if the splunk endpoint is blocked it will cause a
deadlock on `Close()`.
This sets a reasonable timeout for the http request to send a log batch.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This reduces allocs and bytes used per log entry significantly as well
as some improvement to time per log operation.
Each log driver, however, must put messages back in the pool once they
are finished with the message.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This allows the user to set a logging mode to "blocking" (default), or
"non-blocking", which uses the ring buffer as a proxy to the real log
driver.
This allows a container to never be blocked on stdio at the cost of
dropping log messages.
Introduces 2 new log-opts that works for all drivers, `log-mode` and
`log-size`. `log-mode` takes a value of "blocking", or "non-blocking"
I chose not to implement this as a bool since it is difficult to
determine if the mode was set to false vs just not set... especially
difficult when merging the default daemon config with the container config.
`log-size` takes a size string, e.g. `2MB`, which sets the max size
of the ring buffer. When the max size is reached, it will start
dropping log messages.
```
BenchmarkRingLoggerThroughputNoReceiver-8 2000000000 36.2 ns/op 856.35 MB/s 0 B/op 0 allocs/op
BenchmarkRingLoggerThroughputWithReceiverDelay0-8 300000000 156 ns/op 198.48 MB/s 32 B/op 0 allocs/op
BenchmarkRingLoggerThroughputConsumeDelay1-8 2000000000 36.1 ns/op 857.80 MB/s 0 B/op 0 allocs/op
BenchmarkRingLoggerThroughputConsumeDelay10-8 1000000000 36.2 ns/op 856.53 MB/s 0 B/op 0 allocs/op
BenchmarkRingLoggerThroughputConsumeDelay50-8 2000000000 34.7 ns/op 894.65 MB/s 0 B/op 0 allocs/op
BenchmarkRingLoggerThroughputConsumeDelay100-8 2000000000 35.1 ns/op 883.91 MB/s 0 B/op 0 allocs/op
BenchmarkRingLoggerThroughputConsumeDelay300-8 1000000000 35.9 ns/op 863.90 MB/s 0 B/op 0 allocs/op
BenchmarkRingLoggerThroughputConsumeDelay500-8 2000000000 35.8 ns/op 866.88 MB/s 0 B/op 0 allocs/op
```
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
New driver options:
- `splunk-gzip` - gzip compress all requests to Splunk HEC
(enabled by default)
- `splunk-gzip-level` - change compression level.
Messages are sent in batches by 1000, with frequency of 5 seconds.
Maximum buffer is 10,000 events. If HEC will not be available, Splunk
Logging Driver will keep retrying while it can hold messages in buffer.
Added unit tests for driver.
Signed-off-by: Denis Gladkikh <denis@gladkikh.email>
`--log-opt splunk-format=inline|json|raw` allows to change how logging
driver sends data to Splunk, where
`inline` - default value, format used before, message is injected as a
line in JSON payload
`json` - driver will try to parse each line as a JSON object and embed it
inside of the JSON payload
`raw` - driver will send Raw payload instead of JSON, tag and attributes
will be prefixed before the message
`--log-opt splunk-verify-connection=true|false` - allows to skip
verification for Splunk Url
Signed-off-by: Denis Gladkikh <denis@gladkikh.email>
Add support of `tag`, `env` and `labels` for Splunk logging driver.
Removed from message `containerId` as it is the same as `tag`.
Signed-off-by: Denis Gladkikh <denis@gladkikh.email>
