chore: waku_keystore: give some more context in case of error (#3064)

waku/waku_keystore/conversion_utils.nim

@@ -18,6 +18,16 @@ proc decode*(encodedCredential: seq[byte]): KeystoreResult[KeystoreMembership] =
     let jsonObject = parseJson(string.fromBytes(encodedCredential))
     return ok(to(jsonObject, KeystoreMembership))
   except JsonParsingError:
-    return err(AppKeystoreError(kind: KeystoreJsonError, msg: getCurrentExceptionMsg()))
+    return err(
+      AppKeystoreError(
+        kind: KeystoreJsonError,
+        msg: "error during decoding credentials: " & getCurrentExceptionMsg(),
+      )
+    )
   except Exception: #parseJson raises Exception
-    return err(AppKeystoreError(kind: KeystoreOsError, msg: getCurrentExceptionMsg()))
+    return err(
+      AppKeystoreError(
+        kind: KeystoreOsError,
+        msg: "error in conversion_utils decode: " & getCurrentExceptionMsg(),
+      )
+    )

waku/waku_keystore/keystore.nim

@@ -31,7 +31,12 @@ proc createAppKeystore*(
     f.write(separator)
     ok()
   except CatchableError:
-    err(AppKeystoreError(kind: KeystoreOsError, msg: getCurrentExceptionMsg()))
+    err(
+      AppKeystoreError(
+        kind: KeystoreOsError,
+        msg: "error while writing keystore: " & getCurrentExceptionMsg(),
+      )
+    )
   finally:
     f.close()
 
@@ -114,19 +119,43 @@ proc loadAppKeystore*(
         return ok(data)
       # TODO: we might continue rather than return for some of these errors
       except JsonParsingError:
-        return
+        return err(
-          err(AppKeystoreError(kind: KeystoreJsonError, msg: getCurrentExceptionMsg()))
+          AppKeystoreError(
+            kind: KeystoreJsonError,
+            msg:
+              "error during loading keystore, JsonParsingError: " &
+              getCurrentExceptionMsg(),
+          )
+        )
       except ValueError:
-        return
+        return err(
-          err(AppKeystoreError(kind: KeystoreJsonError, msg: getCurrentExceptionMsg()))
+          AppKeystoreError(
+            kind: KeystoreJsonError,
+            msg:
+              "error during loading keystore, ValueError: " & getCurrentExceptionMsg(),
+          )
+        )
       except OSError:
-        return
+        return err(
-          err(AppKeystoreError(kind: KeystoreOsError, msg: getCurrentExceptionMsg()))
+          AppKeystoreError(
+            kind: KeystoreOsError,
+            msg: "error during loading keystore, OSError: " & getCurrentExceptionMsg(),
+          )
+        )
       except Exception: #parseJson raises Exception
-        return
+        return err(
-          err(AppKeystoreError(kind: KeystoreOsError, msg: getCurrentExceptionMsg()))
+          AppKeystoreError(
+            kind: KeystoreOsError,
+            msg: "error during loading keystore, Exception: " & getCurrentExceptionMsg(),
+          )
+        )
   except IOError:
-    return err(AppKeystoreError(kind: KeystoreIoError, msg: getCurrentExceptionMsg()))
+    return err(
+      AppKeystoreError(
+        kind: KeystoreIoError,
+        msg: "error during loading keystore, IOError: " & getCurrentExceptionMsg(),
+      )
+    )
 
   return err(
     AppKeystoreError(

waku/waku_keystore/utils.nim

@@ -30,7 +30,12 @@ proc save*(json: JsonNode, path: string, separator: string): KeystoreResult[void
   # We save the updated json
   var f: File
   if not f.open(path, fmAppend):
-    return err(AppKeystoreError(kind: KeystoreOsError, msg: getCurrentExceptionMsg()))
+    return err(
+      AppKeystoreError(
+        kind: KeystoreOsError,
+        msg: "error in waku_keystore save: " & getCurrentExceptionMsg(),
+      )
+    )
   try:
     # To avoid other users/attackers to be able to read keyfiles, we make the file readable/writable only by the running user
     setFilePermissions(path, {fpUserWrite, fpUserRead})