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config_change_checker.go
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/
config_change_checker.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
package config
import (
"fmt"
"os"
"reflect"
)
// ChangeChecker checks the state of `config.Datadog` did not change
// between `NewChangeChecker()“ and `HasChanged()`. It is
// designed to be used in `TestMain` function as follow:
//
// func TestMain(m *testing.M) {
// checker := testutil.NewConfigChangeChecker()
// exit := m.Run()
// if checker.HasChanged() {
// os.Exit(1)
// }
// os.Exit(exit)
// }
type ChangeChecker struct {
configSettings map[string]interface{}
}
// NewChangeChecker creates a new instance of ConfigChangeChecker
func NewChangeChecker() *ChangeChecker {
return &ChangeChecker{
configSettings: Datadog.AllSettings(),
}
}
// HasChanged returns whether `config.Datadog` changed since
// `NewConfigChangeChecker`. If some changes are detected
// this function displays on the standard error what keys changed.
func (c *ChangeChecker) HasChanged() bool {
allSettingsAfter := Datadog.AllSettings()
stateHasChanged := false
for k, before := range c.configSettings {
after := allSettingsAfter[k]
delete(allSettingsAfter, k)
if !reflect.DeepEqual(before, after) {
_, _ = fmt.Fprintf(os.Stderr, "Config change detected: Key:'%s' previous value:'%+v' new value:'%+v'\n", k, before, after)
stateHasChanged = true
}
}
for k, v := range allSettingsAfter {
_, _ = fmt.Fprintf(os.Stderr, "Config change detected: Key:'%s' was set to value:'%+v' but it was not restored to its default value\n", k, v)
stateHasChanged = true
}
return stateHasChanged
}