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|
package featureflag
import (
"context"
"testing"
"github.com/stretchr/testify/require"
gitaly_metadata "gitlab.com/gitlab-org/gitaly/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 TestAllEnabledFlags(t *testing.T) {
flags := map[string]string{
ffPrefix + "meow": "true",
ffPrefix + "foo": "true",
ffPrefix + "woof": "false", // not enabled
ffPrefix + "bar": "TRUE", // not enabled
}
ctx := metadata.NewIncomingContext(createContext(), metadata.New(flags))
require.ElementsMatch(t, AllFlags(ctx), []string{"meow:true", "foo:true", "woof:false", "bar:TRUE"})
}
func TestRaw(t *testing.T) {
enabledFlag := FeatureFlag{Name: "enabled-flag"}
disabledFlag := FeatureFlag{Name: "disabled-flag"}
raw := Raw{
ffPrefix + enabledFlag.Name: "true",
ffPrefix + disabledFlag.Name: "false",
}
t.Run("RawFromContext", func(t *testing.T) {
ctx := createContext()
ctx = IncomingCtxWithFeatureFlag(ctx, enabledFlag, true)
ctx = IncomingCtxWithFeatureFlag(ctx, disabledFlag, false)
require.Equal(t, raw, RawFromContext(ctx))
})
t.Run("OutgoingWithRaw", func(t *testing.T) {
outgoingMD, ok := metadata.FromOutgoingContext(OutgoingWithRaw(createContext(), raw))
require.True(t, ok)
require.Equal(t, metadata.MD{
ffPrefix + enabledFlag.Name: {"true"},
ffPrefix + disabledFlag.Name: {"false"},
}, outgoingMD)
})
}
|
