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Adds a keys method to the NATS message header #1573

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Adds a keys method to the NATS message header #1573

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11 changes: 11 additions & 0 deletions nats.go
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Expand Up @@ -3640,6 +3640,17 @@ func (h Header) Get(key string) string {
return _EMPTY_
}

// Returns the list of keys in the message header
func (h Header) Keys() []string {
keys := make([]string, len(h))
i := 0
for k := range h {
keys[i] = k
i++
}
return keys
}

// Values returns all values associated with the given key.
// It is case-sensitive.
func (h Header) Values(key string) []string {
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20 changes: 20 additions & 0 deletions nats_test.go
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Expand Up @@ -29,6 +29,7 @@ import (
"reflect"
"regexp"
"runtime"
"slices"
"strconv"
"strings"
"sync"
Expand Down Expand Up @@ -1593,6 +1594,25 @@ func TestHeaderParser(t *testing.T) {
checkStatus("NATS/1.0 404 No Messages", 404, "No Messages")
}

func TestHeaderKeys(t *testing.T) {
m := NewMsg("testing")
m.Header = Header{
"field1": []string{"a"},
"field2": []string{"b"},
}
actualKeys := m.Header.Keys()
if !slices.Contains(actualKeys, "field1") ||
!slices.Contains(actualKeys, "field2") {
t.Fatalf("Keys did not return expected list: %+v", actualKeys)
}

m.Header = Header{}
emptyKeys := m.Header.Keys()
if len(emptyKeys) > 0 {
t.Fatal("Empty header should've returned empty keys list")
}
}

func TestHeaderMultiLine(t *testing.T) {
m := NewMsg("foo")
m.Header = Header{
Expand Down