Initial QSfera import

Server/vendor/go.etcd.io/etcd/client/pkg/v3/verify/verify.go

@@ -0,0 +1,80 @@
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package verify
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+const envVerify = "ETCD_VERIFY"
+
+type VerificationType string
+
+const (
+	envVerifyValueAll    VerificationType = "all"
+	envVerifyValueAssert VerificationType = "assert"
+)
+
+func getEnvVerify() string {
+	return strings.ToLower(os.Getenv(envVerify))
+}
+
+func IsVerificationEnabled(verification VerificationType) bool {
+	env := getEnvVerify()
+	return env == string(envVerifyValueAll) || env == strings.ToLower(string(verification))
+}
+
+// EnableVerifications sets `envVerify` and returns a function that
+// can be used to bring the original settings.
+func EnableVerifications(verification VerificationType) func() {
+	previousEnv := getEnvVerify()
+	os.Setenv(envVerify, string(verification))
+	return func() {
+		os.Setenv(envVerify, previousEnv)
+	}
+}
+
+// EnableAllVerifications enables verification and returns a function
+// that can be used to bring the original settings.
+func EnableAllVerifications() func() {
+	return EnableVerifications(envVerifyValueAll)
+}
+
+// DisableVerifications unsets `envVerify` and returns a function that
+// can be used to bring the original settings.
+func DisableVerifications() func() {
+	previousEnv := getEnvVerify()
+	os.Unsetenv(envVerify)
+	return func() {
+		os.Setenv(envVerify, previousEnv)
+	}
+}
+
+// Verify performs verification if the assertions are enabled.
+// In the default setup running in tests and skipped in the production code.
+func Verify(f func()) {
+	if IsVerificationEnabled(envVerifyValueAssert) {
+		f()
+	}
+}
+
+// Assert will panic with a given formatted message if the given condition is false.
+func Assert(condition bool, msg string, v ...any) {
+	if !condition {
+		panic(fmt.Sprintf("assertion failed: "+msg, v...))
+	}
+}