factor out some shared code

irc/panic.go

@@ -0,0 +1,19 @@
+// Copyright (c) 2021 Shivaram Lingamneni
+// released under the MIT license
+
+package irc
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+// HandlePanic is a general-purpose panic handler for ad-hoc goroutines.
+// Because of the semantics of `recover`, it must be called directly
+// from the routine on whose call stack the panic would occur, with `defer`,
+// e.g. `defer server.HandlePanic()`
+func (server *Server) HandlePanic() {
+	if r := recover(); r != nil {
+		server.logger.Error("internal", fmt.Sprintf("Panic encountered: %v\n%s", r, debug.Stack()))
+	}
+}