ingredient/info: Add Fetcher concept

internal/wisski/ingredient/php/phpserver/errors.go

@@ -0,0 +1,36 @@
+package phpserver
+
+import "fmt"
+
+// Common PHP Errors
+var (
+	errPHPInit    = "Unable to initialize"
+	errPHPMarshal = "Marshal failed"
+	errPHPInvalid = ServerError{Message: "Invalid code to execute"}
+	errPHPReceive = "Failed to receive response"
+	errPHPClosed  = ServerError{Message: "Server closed"}
+)
+
+// PHPError represents an error during PHPServer logic
+type ServerError struct {
+	Message string
+	Err     error
+}
+
+func (err ServerError) Unwrap() error {
+	return err.Err
+}
+
+func (err ServerError) Error() string {
+	if err.Err == nil {
+		return fmt.Sprintf("PHPServer: %s", err.Message)
+	}
+	return fmt.Sprintf("PHPServer: %s: %s", err.Message, err.Err)
+}
+
+// Throwable represents an error during php code
+type Throwable string
+
+func (throwable Throwable) Error() string {
+	return string(throwable)
+}