lnwire+rpcserver: populate feature bits on decodepayreq

lnwire/features.go

@@ -94,6 +94,11 @@ const (
 	maxAllowedSize = 32764
 )
 
+// IsRequired returns true if the feature bit is even, and false otherwise.
+func (b FeatureBit) IsRequired() bool {
+	return b&0x01 == 0x00
+}
+
 // Features is a mapping of known feature bits to a descriptive name. All known
 // feature bits must be assigned a name in this mapping, and feature bit pairs
 // must be assigned together for correct behavior.
@@ -383,6 +388,15 @@ func (fv *FeatureVector) isFeatureBitPair(bit FeatureBit) bool {
 	return known1 && known2 && name1 == name2
 }
 
+// Features returns the set of raw features contained in the feature vector.
+func (fv *FeatureVector) Features() map[FeatureBit]struct{} {
+	fs := make(map[FeatureBit]struct{}, len(fv.RawFeatureVector.features))
+	for b := range fv.RawFeatureVector.features {
+		fs[b] = struct{}{}
+	}
+	return fs
+}
+
 // Clone copies a feature vector, carrying over its feature bits. The feature
 // names are not copied.
 func (fv *FeatureVector) Clone() *FeatureVector {