Tweak envoy config structs

Have each node define it's own configs where the decoder may
define the wanted values and the global config populates missing
values in the Bake step.

server/pkg/envoyx/envoy.go

@@ -64,13 +64,12 @@ type (
 	DecoderConfig struct{}
 
 	EncodeParams struct {
-		Type   encodeType
-		Params map[string]any
-		Config EncoderConfig
+		Type    encodeType
+		Params  map[string]any
+		Envoy   EnvoyConfig
+		Encoder EncoderConfig
 	}
 	EncoderConfig struct {
-		OnExisting mergeAlg
-
 		PreferredTimeLayout string
 		PreferredTimezone   string
 	}
@@ -93,7 +92,8 @@ var (
 )
 
 const (
-	OnConflictReplace mergeAlg = iota
+	OnConflictDefault mergeAlg = iota
+	OnConflictReplace
 	OnConflictSkip
 	OnConflictPanic
 	// OnConflictMergeLeft  mergeAlg = "mergeLeft"
@@ -145,6 +145,11 @@ func (svc *service) Decode(ctx context.Context, p DecodeParams) (nn NodeSet, err
 	return
 }
 
+func (svc *service) Bake(ctx context.Context, p EncodeParams, nodes ...*Node) (err error) {
+	err = svc.bakeEnvoyConfig(p.Envoy, nodes...)
+	return
+}
+
 // Encode encodes Corteza resources bases on the provided encode params
 //
 // use the BuildDepGraph function to build the default dependency graph.
@@ -227,3 +232,28 @@ func CastMergeAlg(v string) (mergeAlg mergeAlg) {
 
 	return
 }
+
+func (svc *service) bakeEnvoyConfig(dft EnvoyConfig, nodes ...*Node) (err error) {
+	for _, n := range nodes {
+		n.Config = svc.mergeEnvoyConfigs(n.Config, dft)
+	}
+
+	return
+}
+
+func (svc *service) mergeEnvoyConfigs(a, b EnvoyConfig) (c EnvoyConfig) {
+	c = a
+	if c.MergeAlg == OnConflictDefault {
+		c.MergeAlg = b.MergeAlg
+	}
+	if c.MergeAlg == OnConflictDefault {
+		c.MergeAlg = OnConflictReplace
+	}
+
+	// @todo pre eval this?
+	if c.SkipIf == "" {
+		c.SkipIf = b.SkipIf
+	}
+
+	return
+}

server/pkg/envoyx/envoy_test.go

@@ -0,0 +1,45 @@
+package envoyx
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestBake(t *testing.T) {
+	ctx := context.Background()
+	req := require.New(t)
+
+	t.Run("set default envoy config", func(t *testing.T) {
+		a := &Node{
+			Config: EnvoyConfig{
+				MergeAlg: OnConflictDefault,
+				SkipIf:   "",
+			},
+		}
+		b := &Node{
+			Config: EnvoyConfig{
+				MergeAlg: OnConflictReplace,
+				SkipIf:   "",
+			},
+		}
+		c := &Node{
+			Config: EnvoyConfig{
+				MergeAlg: OnConflictReplace,
+				SkipIf:   "true",
+			},
+		}
+		err := (&service{}).Bake(ctx, EncodeParams{Envoy: EnvoyConfig{MergeAlg: OnConflictPanic, SkipIf: "false"}}, a, b, c)
+		req.NoError(err)
+
+		req.Equal(OnConflictPanic, a.Config.MergeAlg)
+		req.Equal("false", a.Config.SkipIf)
+
+		req.Equal(OnConflictReplace, b.Config.MergeAlg)
+		req.Equal("false", b.Config.SkipIf)
+
+		req.Equal(OnConflictReplace, c.Config.MergeAlg)
+		req.Equal("true", c.Config.SkipIf)
+	})
+}

server/pkg/envoyx/node.go

@@ -19,9 +19,9 @@ type (
 
 		// Placeholders are resources which were added to help resolve missing deps
 		Placeholder bool
-		Config      NodeConfig
+		Config      EnvoyConfig
 	}
-	NodeConfig struct {
+	EnvoyConfig struct {
 		MergeAlg mergeAlg
 		SkipIf   string
 	}