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Reduce allocations in the json_decode plugin #743

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Reduce allocations in the json_decode plugin #743

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2685a1c
Reduce allocations in the json_decode plugin
vadimalekseev Jan 24, 2025
580c05f
Move MergeToRoot logic to util
vadimalekseev Feb 14, 2025
26953cd
Merge branch 'master' into 742-json-decode-allocs
vadimalekseev Feb 14, 2025
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27 changes: 16 additions & 11 deletions plugin/action/json_decode/json_decode.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,9 @@ If the decoded JSON isn't an object, the event will be skipped.
}*/

type Plugin struct {
config *Config
logger *zap.Logger
config *Config
logger *zap.Logger
parseMode logJsonParseErrorMode
}

type logJsonParseErrorMode int
Expand Down Expand Up @@ -48,8 +49,7 @@ type Config struct {
// > @jsonParseErrorMode|comment-list
// >
// > Defaults to `off`.
LogJSONParseErrorMode string `json:"log_json_parse_error_mode" default:"off" options:"off|erronly|withnode"` // *
LogJSONParseErrorMode_ logJsonParseErrorMode
LogJSONParseErrorMode string `json:"log_json_parse_error_mode" default:"off" options:"off|erronly|withnode"` // *
}

func init() {
Expand All @@ -68,13 +68,13 @@ func (p *Plugin) Start(config pipeline.AnyConfig, params *pipeline.ActionPluginP
p.logger = params.Logger.Desugar()
switch p.config.LogJSONParseErrorMode {
case "off":
p.config.LogJSONParseErrorMode_ = logJsonParseErrorOff
p.parseMode = logJsonParseErrorOff
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@vadimalekseev vadimalekseev Jan 24, 2025 •
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It fixes the data race in the Start() method

case "erronly":
p.config.LogJSONParseErrorMode_ = logJsonParseErrorErrOnly
p.parseMode = logJsonParseErrorErrOnly
case "withnode":
p.config.LogJSONParseErrorMode_ = logJsonParseErrorWithNode
p.parseMode = logJsonParseErrorWithNode
default:
p.config.LogJSONParseErrorMode_ = logJsonParseErrorOff
p.parseMode = logJsonParseErrorOff
}
}

Expand All @@ -89,9 +89,9 @@ func (p *Plugin) Do(event *pipeline.Event) pipeline.ActionResult {

node, err := event.Root.DecodeBytesAdditional(jsonNode.AsBytes())
if err != nil {
if p.config.LogJSONParseErrorMode_ == logJsonParseErrorErrOnly {
if p.parseMode == logJsonParseErrorErrOnly {
p.logger.Error("failed to parse json", zap.Error(err))
} else if p.config.LogJSONParseErrorMode_ == logJsonParseErrorWithNode {
} else if p.parseMode == logJsonParseErrorWithNode {
p.logger.Error("failed to parse json", zap.Error(err), zap.String("node", jsonNode.AsString()))
}
return pipeline.ActionPass
Expand All @@ -114,7 +114,12 @@ func (p *Plugin) Do(event *pipeline.Event) pipeline.ActionResult {
}

// place decoded object under root
event.Root.MergeWith(node)
fields := node.AsFields()
for _, child := range fields {
childField := child.AsString()
x := event.Root.AddFieldNoAlloc(event.Root, childField)
x.MutateToNode(child.AsFieldValue())
}

return pipeline.ActionPass
}
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