Extend support for ErrorReporting.

Adds Publisher which directly supports GCP ErrorReporting.

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## v0.0.44 ErrorReporting
+- Add `errorreports.Error`
+
+  Special error interface so that it is possible to generate a GCP ErrorReport directly from `error`.
+- Add `publisher.Publisher`
+
+  Use `Publisher` for rich publish integration. Resulting error can directly be used for GCP ErrorReporting.
+
 ## v0.0.39 More options for envflags
 - Add function `envflags.GetBoolDefault`
 

pkg/gcp/errorreports/error.go

@@ -0,0 +1,14 @@
+package errorreports
+
+import (
+	"cloud.google.com/go/errorreporting"
+)
+
+// Error can be used to build a `errorreporting.Entry`.
+type Error interface {
+	error
+
+	// ReportingEntry uses the saved error information to build
+	// an `errorreporting.Entry`.
+	ReportingEntry() *errorreporting.Entry
+}

pkg/publisher/publisher.go

@@ -0,0 +1,22 @@
+package publisher
+
+import (
+	"context"
+
+	"github.com/otto-de/sherlock-microservice/pkg/gcp/errorreports"
+)
+
+type Option struct {
+	orderingKey string
+}
+
+func WithOrderingKey(orderingKey string) Option {
+	return Option{
+		orderingKey: orderingKey,
+	}
+}
+
+type Publisher[EV any] interface {
+	// Publish publishes an Event to Target.
+	Publish(ctx context.Context, event *EV, opts ...Option) errorreports.Error
+}