Complete notification expiry and configurable durable delivery (#36)

backend/notifications/bus/config.go

@@ -0,0 +1,38 @@
+package bus
+
+import (
+	merrors "git.sendico.io/tech/sxchnge/shared/errors"
+	"git.sendico.io/tech/sxchnge/shared/messaging/reliable"
+)
+
+// Config composes canonical shared messaging settings for this service's queue.
+type Config struct {
+	Stream       reliable.DurableStreamSettings       `yaml:"stream"`
+	Provisioning reliable.DurableProvisioningSettings `yaml:"provisioning"`
+}
+
+func DefaultConfig() Config {
+	return Config{
+		Stream:       reliable.DurableStreamSettings{Name: "SXCHNGE_NOTIFICATIONS", Subjects: []string{subject}, Storage: "file", MaxAgeHours: 48, Replicas: 1},
+		Provisioning: reliable.DurableProvisioningSettings{Mode: reliable.DurableProvisioningApp, Environment: reliable.DurableEnvironmentNonProduction},
+	}
+}
+func (c Config) Validate() error {
+	if c.Stream.Name != "SXCHNGE_NOTIFICATIONS" || len(c.Stream.Subjects) != 1 || c.Stream.Subjects[0] != subject || c.Stream.Storage != "file" || c.Stream.MaxAgeHours < 48 || c.Stream.MaxAgeHours > 24*30 {
+		return merrors.InvalidArgument("invalid notifications stream configuration")
+	}
+	if c.Stream.Replicas != 1 && c.Stream.Replicas != 3 && c.Stream.Replicas != 5 {
+		return merrors.InvalidArgument("stream replicas must be 1, 3 or 5")
+	}
+	switch c.Provisioning.Mode {
+	case reliable.DurableProvisioningApp, reliable.DurableProvisioningOps, reliable.DurableProvisioningHybrid:
+	default:
+		return merrors.InvalidArgument("invalid stream provisioning mode")
+	}
+	switch c.Provisioning.Environment {
+	case reliable.DurableEnvironmentProduction, reliable.DurableEnvironmentNonProduction:
+	default:
+		return merrors.InvalidArgument("invalid stream provisioning environment")
+	}
+	return nil
+}