f17bc5ed73
* inject logger and create logdrop sink * init sink with an empty struct instead of nil * wrap a logger instead of a sink and add a discard logger to avoid double logging * fix compile errors * fix linter errors * Fix bug where log arguments aren't properly formatted * Move log sink construction outside of handler * Add prometheus definition and docs for log drop counter Co-authored-by: Daniel Upton <daniel@floppy.co>
65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package logdrop
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import (
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"context"
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"github.com/hashicorp/go-hclog"
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)
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// Logger mimic the interface from hclog.Logger
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//
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//go:generate mockery --name Logger --inpackage
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type Logger interface {
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Log(level hclog.Level, msg string, args ...interface{})
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}
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type Log struct {
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s string
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i []interface{}
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l hclog.Level
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}
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type logDropSink struct {
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logger Logger
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logCh chan Log
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dropFn func(l Log)
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}
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// Accept consume a log and push it into a channel,
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// if the channel is filled it will call dropFn
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func (r *logDropSink) Accept(_ string, level hclog.Level, msg string, args ...interface{}) {
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r.pushLog(Log{l: level, s: msg, i: args})
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}
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func (r *logDropSink) pushLog(l Log) {
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select {
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case r.logCh <- l:
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default:
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r.dropFn(l)
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}
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}
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func (r *logDropSink) logConsumer(ctx context.Context) {
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for {
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select {
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case l := <-r.logCh:
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r.logger.Log(l.l, l.s, l.i...)
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case <-ctx.Done():
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return
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}
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}
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}
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// NewLogDropSink create a log Logger that wrap another Logger
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// It also create a go routine for consuming logs, the given context need to be canceled
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// to properly deallocate the Logger.
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func NewLogDropSink(ctx context.Context, depth int, logger Logger, dropFn func(l Log)) hclog.SinkAdapter {
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r := &logDropSink{
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logger: logger,
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logCh: make(chan Log, depth),
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dropFn: dropFn,
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}
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go r.logConsumer(ctx)
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return r
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}
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