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package featureflag
import (
"context"
"testing"
"github.com/stretchr/testify/require"
gitaly_metadata "gitlab.com/gitlab-org/gitaly/v15/internal/metadata"
"google.golang.org/grpc/metadata"
)
var (
ffA = FeatureFlag{"feature-a", false}
ffB = FeatureFlag{"feature-b", false}
)
//nolint:forbidigo // We cannot use `testhelper.Context()` given that it would inject feature flags
// already.
func createContext() context.Context {
return context.Background()
}
func TestIncomingCtxWithFeatureFlag(t *testing.T) {
ctx := createContext()
require.False(t, ffA.IsEnabled(ctx))
require.False(t, ffB.IsEnabled(ctx))
t.Run("enabled", func(t *testing.T) {
ctx := IncomingCtxWithFeatureFlag(ctx, ffA, true)
require.True(t, ffA.IsEnabled(ctx))
})
t.Run("disabled", func(t *testing.T) {
ctx := IncomingCtxWithFeatureFlag(ctx, ffA, false)
require.False(t, ffA.IsEnabled(ctx))
})
t.Run("set multiple flags", func(t *testing.T) {
ctxA := IncomingCtxWithFeatureFlag(ctx, ffA, true)
ctxB := IncomingCtxWithFeatureFlag(ctxA, ffB, true)
require.True(t, ffA.IsEnabled(ctxA))
require.False(t, ffB.IsEnabled(ctxA))
require.True(t, ffA.IsEnabled(ctxB))
require.True(t, ffB.IsEnabled(ctxB))
})
}
func TestOutgoingCtxWithFeatureFlag(t *testing.T) {
ctx := createContext()
require.False(t, ffA.IsEnabled(ctx))
require.False(t, ffB.IsEnabled(ctx))
t.Run("enabled", func(t *testing.T) {
ctx := OutgoingCtxWithFeatureFlag(ctx, ffA, true)
// The feature flag is only checked for incoming contexts, so it's not expected to
// be enabled yet.
require.False(t, ffA.IsEnabled(ctx))
md, ok := metadata.FromOutgoingContext(ctx)
require.True(t, ok)
// It should be enabled after converting it to an incoming context though.
ctx = metadata.NewIncomingContext(createContext(), md)
require.True(t, ffA.IsEnabled(ctx))
})
t.Run("disabled", func(t *testing.T) {
ctx = OutgoingCtxWithFeatureFlag(ctx, ffA, false)
require.False(t, ffA.IsEnabled(ctx))
md, ok := metadata.FromOutgoingContext(ctx)
require.True(t, ok)
ctx = metadata.NewIncomingContext(createContext(), md)
require.False(t, ffA.IsEnabled(ctx))
})
t.Run("set multiple flags", func(t *testing.T) {
ctxA := OutgoingCtxWithFeatureFlag(ctx, ffA, true)
ctxB := OutgoingCtxWithFeatureFlag(ctxA, ffB, true)
ctxA = gitaly_metadata.OutgoingToIncoming(ctxA)
require.True(t, ffA.IsEnabled(ctxA))
require.False(t, ffB.IsEnabled(ctxA))
ctxB = gitaly_metadata.OutgoingToIncoming(ctxB)
require.True(t, ffA.IsEnabled(ctxB))
require.True(t, ffB.IsEnabled(ctxB))
})
}
func TestGRPCMetadataFeatureFlag(t *testing.T) {
testCases := []struct {
flag string
headers map[string]string
enabled bool
onByDefault bool
desc string
}{
{"", nil, false, false, "empty name and no headers"},
{"flag", nil, false, false, "no headers"},
{"flag", map[string]string{"flag": "true"}, false, false, "no 'gitaly-feature' prefix in flag name"},
{"flag", map[string]string{"gitaly-feature-flag": "TRUE"}, false, false, "not valid header value"},
{"flag_under_score", map[string]string{"gitaly-feature-flag-under-score": "true"}, true, false, "flag name with underscores"},
{"flag-dash-ok", map[string]string{"gitaly-feature-flag-dash-ok": "true"}, true, false, "flag name with dashes"},
{"flag", map[string]string{"gitaly-feature-flag": "false"}, false, true, "flag explicitly disabled"},
{"flag", map[string]string{}, true, true, "flag enabled by default but missing"},
}
for _, tc := range testCases {
t.Run(tc.desc, func(t *testing.T) {
md := metadata.New(tc.headers)
ctx := metadata.NewIncomingContext(createContext(), md)
require.Equal(t, tc.enabled, FeatureFlag{tc.flag, tc.onByDefault}.IsEnabled(ctx))
})
}
}
func TestFromContext(t *testing.T) {
defer func(old map[string]FeatureFlag) {
flagsByName = old
}(flagsByName)
defaultDisabledFlag := FeatureFlag{
Name: "default_disabled",
OnByDefault: false,
}
defaultEnabledFlag := FeatureFlag{
Name: "default_enabled",
OnByDefault: true,
}
flagsByName = map[string]FeatureFlag{
"default_disabled": defaultDisabledFlag,
"default_enabled": defaultEnabledFlag,
}
t.Run("with no defined flags", func(t *testing.T) {
require.Empty(t, FromContext(createContext()))
})
t.Run("with single defined flag", func(t *testing.T) {
ctx := ContextWithFeatureFlag(createContext(), defaultDisabledFlag, false)
ctx = ContextWithFeatureFlag(ctx, defaultEnabledFlag, true)
require.Equal(t, map[FeatureFlag]bool{
defaultDisabledFlag: false,
defaultEnabledFlag: true,
}, FromContext(ctx))
})
t.Run("with defined flags and non-default values", func(t *testing.T) {
ctx := ContextWithFeatureFlag(createContext(), defaultDisabledFlag, true)
ctx = ContextWithFeatureFlag(ctx, defaultEnabledFlag, false)
require.Equal(t, map[FeatureFlag]bool{
defaultDisabledFlag: true,
defaultEnabledFlag: false,
}, FromContext(ctx))
})
t.Run("with defined and undefined flag", func(t *testing.T) {
undefinedFlag := FeatureFlag{
Name: "undefined_flag",
}
ctx := ContextWithFeatureFlag(createContext(), defaultDisabledFlag, false)
ctx = ContextWithFeatureFlag(ctx, undefinedFlag, false)
require.Equal(t, map[FeatureFlag]bool{
defaultDisabledFlag: false,
undefinedFlag: false,
}, FromContext(ctx))
})
}
|
