fortify: move error handling to separate file

Error handling here is way too monstrous due to terrible design of the internal/app package. Since rewriting internal/app will take a while, error handling is moved out of main to improve readability.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

1 files changed, 61 insertions, 0 deletions

diff --git a/error.go b/error.go
new file mode 100644
index 00000000..ee48684a
--- /dev/null
+++ b/error.go
@@ -0,0 +1,61 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"git.ophivana.moe/cat/fortify/internal/app"
+)
+
+func logWaitError(err error) {
+	var e *app.BaseError
+	if !app.AsBaseError(err, &e) {
+		fmt.Println("fortify: wait failed:", err)
+	} else {
+		// Wait only returns either *app.ProcessError or *app.StateStoreError wrapped in a *app.BaseError
+		var se *app.StateStoreError
+		if !errors.As(err, &se) {
+			// does not need special handling
+			fmt.Print("fortify: " + e.Message())
+		} else {
+			// inner error are either unwrapped store errors
+			// or joined errors returned by *appSealTx revert
+			// wrapped in *app.BaseError
+			var ej app.RevertCompoundError
+			if !errors.As(se.InnerErr, &ej) {
+				// does not require special handling
+				fmt.Print("fortify: " + e.Message())
+			} else {
+				errs := ej.Unwrap()
+
+				// every error here is wrapped in *app.BaseError
+				for _, ei := range errs {
+					var eb *app.BaseError
+					if !errors.As(ei, &eb) {
+						// unreachable
+						fmt.Println("fortify: invalid error type returned by revert:", ei)
+					} else {
+						// print inner *app.BaseError message
+						fmt.Print("fortify: " + eb.Message())
+					}
+				}
+			}
+		}
+	}
+}
+
+func logBaseError(err error, message string) {
+	var e *app.BaseError
+
+	if app.AsBaseError(err, &e) {
+		fmt.Print("fortify: " + e.Message())
+	} else {
+		fmt.Println(message, err)
+	}
+}
+
+func fatalf(format string, a ...any) {
+	fmt.Printf("fortify: "+format, a...)
+	os.Exit(1)
+}