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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| package metadata | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "reflect" | ||
|
|
||
| "github.com/grafana/agent/component" | ||
| _ "github.com/grafana/agent/component/all" | ||
| "github.com/grafana/agent/component/common/loki" | ||
| "github.com/grafana/agent/component/discovery" | ||
| ) | ||
|
|
||
| type DataType string | ||
|
|
||
| var ( | ||
| // DataTypeTargets represents things that need to be scraped. These are used by multiple telemetry signals | ||
| // scraping components and often require special labels, e.g. __path__ label is required for scraping | ||
| // logs from files using loki.source.file component. | ||
| DataTypeTargets = DataType("Targets") | ||
|
|
||
| // DataTypeLokiLogs represent logs in Loki format | ||
| DataTypeLokiLogs = DataType("Loki Logs") | ||
|
|
||
| DataTypeOTELTelemetry = DataType("OTEL Telemetry") | ||
| DataTypePromMetrics = DataType("Prometheus Metrics") | ||
| DataTypePyroscopeProfiles = DataType("Pyroscope Profiles") | ||
| ) | ||
|
|
||
| type Metadata struct { | ||
| Accepts []DataType | ||
| Outputs []DataType | ||
| } | ||
|
|
||
| func (m Metadata) Empty() bool { | ||
| return len(m.Accepts) == 0 && len(m.Outputs) == 0 | ||
| } | ||
|
|
||
| func ForComponent(name string) (Metadata, error) { | ||
| reg, ok := component.Get(name) | ||
| if !ok { | ||
| return Metadata{}, fmt.Errorf("could not find component %q", name) | ||
| } | ||
| return inferMetadata(reg.Args, reg.Exports), nil | ||
| } | ||
|
|
||
| func inferMetadata(args component.Arguments, exports component.Exports) Metadata { | ||
| var accepts []DataType | ||
| var outputs []DataType | ||
|
|
||
| if exports != nil { | ||
| if hasFieldOfType(exports, reflect.TypeOf(loki.NewLogsReceiver())) { | ||
| accepts = append(accepts, DataTypeLokiLogs) | ||
| } | ||
| if hasFieldOfType(exports, reflect.TypeOf([]discovery.Target{})) { | ||
| outputs = append(outputs, DataTypeTargets) | ||
| } | ||
| } | ||
|
|
||
| if args != nil { | ||
| if hasFieldOfType(args, reflect.TypeOf([]discovery.Target{})) { | ||
| accepts = append(accepts, DataTypeTargets) | ||
| } | ||
| // Components that have e.g. `ForwardsTo []loki.LogsReceiver` arguments, typically output logs | ||
| if hasFieldOfType(args, reflect.TypeOf([]loki.LogsReceiver{})) { | ||
| outputs = append(outputs, DataTypeLokiLogs) | ||
| } | ||
| } | ||
|
|
||
| return Metadata{ | ||
| Accepts: accepts, | ||
| Outputs: outputs, | ||
| } | ||
| } | ||
|
|
||
| func hasFieldOfType(obj interface{}, fieldType reflect.Type) bool { | ||
| objValue := reflect.ValueOf(obj) | ||
|
|
||
| // If the object is a pointer, dereference it | ||
| for objValue.Kind() == reflect.Ptr { | ||
| objValue = objValue.Elem() | ||
| } | ||
|
|
||
| // If the object is not a struct or interface, return false | ||
| if objValue.Kind() != reflect.Struct && objValue.Kind() != reflect.Interface { | ||
| return false | ||
| } | ||
|
|
||
| for i := 0; i < objValue.NumField(); i++ { | ||
| fv := objValue.Field(i) | ||
| ft := fv.Type() | ||
|
|
||
| // If the field type matches the given type, return true | ||
| if ft == fieldType { | ||
| return true | ||
| } | ||
|
|
||
| if fv.Kind() == reflect.Interface && fieldType.AssignableTo(ft) { | ||
| return true | ||
| } | ||
|
|
||
| // If the field is a struct, recursively check its fields | ||
| if fv.Kind() == reflect.Struct { | ||
| if hasFieldOfType(fv.Interface(), fieldType) { | ||
| return true | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return false | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package metadata | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func Test_inferMetadata(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| expected Metadata | ||
| }{ | ||
| { | ||
| name: "discovery.dns", | ||
| expected: Metadata{Outputs: []DataType{DataTypeTargets}}, | ||
| }, | ||
| { | ||
| name: "discovery.relabel", | ||
| expected: Metadata{ | ||
| Accepts: []DataType{DataTypeTargets}, | ||
| Outputs: []DataType{DataTypeTargets}, | ||
| }, | ||
| }, | ||
| { | ||
| name: "loki.echo", | ||
| expected: Metadata{Accepts: []DataType{DataTypeLokiLogs}}, | ||
| }, | ||
| { | ||
| name: "loki.source.file", | ||
| expected: Metadata{ | ||
| Accepts: []DataType{DataTypeTargets}, | ||
| Outputs: []DataType{DataTypeLokiLogs}, | ||
| }, | ||
| }, | ||
| { | ||
| name: "loki.process", | ||
| expected: Metadata{ | ||
| Accepts: []DataType{DataTypeLokiLogs}, | ||
| Outputs: []DataType{DataTypeLokiLogs}, | ||
| }, | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| actual, err := ForComponent(tt.name) | ||
| require.NoError(t, err) | ||
| require.Equal(t, tt.expected, actual) | ||
| }) | ||
| } | ||
| } |
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