mirror of https://github.com/portainer/portainer
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
/*
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Package featureflags implements feature flags for Portainer projects
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Feature flags are used to turn on features that are not production ready.
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Use the Parse function to enable feature flags and also the pass a list of
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available flags
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e.g.
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var SupportedFeatureFlags = []featureflags.Feature{
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"my-feature",
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}
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func main() {
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// parse cli flags
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// pass cli flags and supported feature flags to featureflags.Parse
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featureflags.Parse([]string{"my-feature"}, SupportedFeatureFlags)
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}
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...
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if featureflags.IsEnabled("my-feature") {
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// do something
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}
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*/
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package featureflags
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import (
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"os"
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"strings"
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"github.com/rs/zerolog/log"
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)
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// Feature represents a feature that can be enabled or disabled via feature flags
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type Feature string
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var featureFlags map[Feature]bool
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// String returns the string representation of a feature flag
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func (f Feature) String() string {
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return string(f)
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}
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// IsEnabled returns true if the feature flag is enabled
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func IsEnabled(feat Feature) bool {
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return featureFlags[feat]
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}
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// IsSupported returns true if the feature is supported
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func IsSupported(feat Feature) bool {
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_, ok := featureFlags[feat]
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return ok
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}
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// FeatureFlags returns a map of all feature flags.
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// this is useful in situations where you need to pass all feature flags to a REST handler
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// function
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func FeatureFlags() map[Feature]bool {
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return featureFlags
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}
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func initSupportedFeatures(supportedFeatures []Feature) {
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featureFlags = make(map[Feature]bool)
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for _, feat := range supportedFeatures {
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featureFlags[feat] = false
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}
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}
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// Parse turns on feature flags
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// It accepts a list of feature flags as strings and a list of supported features.
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// It will also check for feature flags in the PORTAINER_FEATURE_FLAGS environment variable.
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// Multiple feature flags can be specified with the PORTAINER_FEATURE_FLAGS environment.
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// variable using a comma separated list. e.g. "PORTAINER_FEATURE_FLAGS=feature1,feature2".
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// If a feature flag is not supported, it will be logged and ignored.
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// If a feature flag is supported, it will be logged and enabled.
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func Parse(features []string, supportedFeatures []Feature) {
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initSupportedFeatures(supportedFeatures)
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env := os.Getenv("PORTAINER_FEATURE_FLAGS")
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envFeatures := []string{}
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if env != "" {
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envFeatures = strings.Split(env, ",")
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}
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features = append(features, envFeatures...)
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// loop through feature flags to check if they are supported
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for _, feat := range features {
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f := Feature(strings.ToLower(feat))
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_, ok := featureFlags[f]
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if !ok {
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log.Warn().Str("feature", f.String()).Msgf("unknown feature flag")
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continue
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}
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featureFlags[f] = true
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log.Info().Str("feature", f.String()).Msg("enabling feature")
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}
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}
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