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feat(log): wire logger filtering (#15601)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| package log | ||
|
|
||
| import "github.com/rs/zerolog" | ||
|
|
||
| // defaultConfig has all the options disabled. | ||
| var defaultConfig = Config{ | ||
| Level: zerolog.NoLevel, | ||
| Filter: nil, | ||
| OutputJSON: false, | ||
| } | ||
|
|
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| // LoggerConfig defines configuration for the logger. | ||
| type Config struct { | ||
| Level zerolog.Level | ||
| Filter FilterFunc | ||
| OutputJSON bool | ||
| } | ||
|
|
||
| type Option func(*Config) | ||
|
|
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| // FilterOption sets the filter for the Logger. | ||
| func FilterOption(filter FilterFunc) Option { | ||
| return func(cfg *Config) { | ||
| cfg.Filter = filter | ||
| } | ||
| } | ||
|
|
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| // LevelOption sets the level for the Logger. | ||
| // Messages with a lower level will be discarded. | ||
| func LevelOption(level zerolog.Level) Option { | ||
| return func(cfg *Config) { | ||
| cfg.Level = level | ||
| } | ||
| } | ||
|
|
||
| // OutputJSONOption sets the output of the logger to JSON. | ||
| // By default, the logger outputs to a human-readable format. | ||
| func OutputJSONOption() Option { | ||
| return func(cfg *Config) { | ||
| cfg.OutputJSON = true | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| package log | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| ) | ||
|
|
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| // NewFilterWriter returns a writer that filters out all key/value pairs that do not match the filter. | ||
| // If the filter is nil, the writer will pass all events through. | ||
| // The filter function is called with the module and level of the event. | ||
| func NewFilterWriter(parent io.Writer, filter FilterFunc) io.Writer { | ||
| return &filterWriter{parent, filter} | ||
| } | ||
|
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| type filterWriter struct { | ||
| parent io.Writer | ||
| filter FilterFunc | ||
| } | ||
|
|
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| func (fw *filterWriter) Write(p []byte) (n int, err error) { | ||
| if fw.filter == nil { | ||
| return fw.parent.Write(p) | ||
| } | ||
|
|
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| var event struct { | ||
| Level string `json:"level"` | ||
| Module string `json:"module"` | ||
| } | ||
|
|
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| if err := json.Unmarshal(p, &event); err != nil { | ||
| return 0, fmt.Errorf("failed to unmarshal event: %w", err) | ||
| } | ||
|
|
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| // only filter module keys | ||
| if fw.filter(event.Module, event.Level) { | ||
| return len(p), nil | ||
| } | ||
|
|
||
| return fw.parent.Write(p) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package log_test | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "strings" | ||
| "testing" | ||
|
|
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| "cosmossdk.io/log" | ||
| "gotest.tools/v3/assert" | ||
| ) | ||
|
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| func TestFilteredWriter(t *testing.T) { | ||
| buf := new(bytes.Buffer) | ||
|
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| level := "consensus:debug,mempool:debug,*:error" | ||
| filter, err := log.ParseLogLevel(level) | ||
| assert.NilError(t, err) | ||
|
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| logger := log.NewLogger(buf, log.FilterOption(filter)) | ||
| logger.Debug("this log line should be displayed", log.ModuleKey, "consensus") | ||
| assert.Check(t, strings.Contains(buf.String(), "this log line should be displayed")) | ||
| buf.Reset() | ||
|
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| logger.Debug("this log line should be filtered", log.ModuleKey, "server") | ||
| assert.Check(t, buf.Len() == 0) | ||
| } |
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