fix: better error messages for 422

internal/store/event_loop.go

@@ -431,7 +431,7 @@ func (loop *eventLoop) processMessages(eventLog *logrus.Entry, messages []*pmapi
 				msgLog.WithError(err).Warning("Message was not present in DB. Trying fetch...")
 
 				if msg, err = loop.apiClient.GetMessage(message.ID); err != nil {
-					if err == pmapi.ErrNoSuchAPIID {
+					if _, ok := err.(*pmapi.ErrUnprocessableEntity); ok {
 						msgLog.WithError(err).Warn("Skipping message update because message exists neither in local DB nor on API")
 						err = nil
 						continue

pkg/pmapi/client.go

@@ -56,10 +56,16 @@ var (
 	ErrInvalidToken       = errors.New("refresh token invalid")
 	ErrAPINotReachable    = errors.New("cannot reach the server")
 	ErrUpgradeApplication = errors.New("application upgrade required")
-
-	ErrNoSuchAPIID = errors.New("no such API ID")
 )
 
+type ErrUnprocessableEntity struct {
+	error
+}
+
+func (err *ErrUnprocessableEntity) Error() string {
+	return err.error.Error()
+}
+
 type ErrUnauthorized struct {
 	error
 }

pkg/pmapi/res.go

@@ -17,7 +17,11 @@
 
 package pmapi
 
-import "net/http"
+import (
+	"net/http"
+
+	"github.com/pkg/errors"
+)
 
 // Common response codes.
 const (
@@ -38,7 +42,7 @@ type Res struct {
 // Err returns error if the response is an error. Otherwise, returns nil.
 func (res Res) Err() error {
 	if res.StatusCode == http.StatusUnprocessableEntity {
-		return ErrNoSuchAPIID
+		return &ErrUnprocessableEntity{errors.New(res.Error)}
 	}
 
 	if res.ResError == nil {