Add diff_logfatal_and_logpanic

Author: devlights

examples/singleapp/diff_logfatal_and_logpanic/Taskfile.yml

@@ -0,0 +1,15 @@
+version: '3'
+
+tasks:
+  default:
+    cmds:
+      - task: run-logfatal
+      - task: run-logpanic
+  run-logfatal:
+    cmds:
+      - cmd: go run fatal/logfatal.go
+        ignore_error: true
+  run-logpanic:
+    cmds:
+      - cmd: go run panic/logpanic.go
+        ignore_error: true

examples/singleapp/diff_logfatal_and_logpanic/fatal/logfatal.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+)
+
+var (
+	l = log.New(os.Stderr, ">>> ", 0)
+)
+
+func main() {
+	// log.Fatal は、os.Exit(1) を呼び出すのでdeferが呼ばれない
+	// log.Fatal は、OSに戻り値 1 を返す (linuxの場合)
+	//
+	// REFERENCES:
+	//   - https://zenn.dev/spiegel/books/error-handling-in-golang/viewer/panics
+	defer fmt.Println("call defer")
+	l.Fatalln("call log.Fatal")
+}

examples/singleapp/diff_logfatal_and_logpanic/panic/logpanic.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+)
+
+var (
+	l = log.New(os.Stderr, ">>> ", 0)
+)
+
+func main() {
+	// log.Panic は、panicを呼び出すのでdeferが呼ばれる
+	// log.Panic は、OSに戻り値 2 を返す (linuxの場合)
+	//
+	// REFERENCES:
+	//   - https://zenn.dev/spiegel/books/error-handling-in-golang/viewer/panics
+	defer fmt.Println("call defer")
+	l.Panicln("call log.Panic")
+}