Added ToSnakeCase for discriminators

Author: silaslenihan

pkg/solana/chainwriter/helpers.go

@@ -8,6 +8,7 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+	"regexp"
 	"strings"
 	"testing"
 
@@ -204,12 +205,18 @@ func InitializeDataAccount(
 }
 
 func GetDiscriminator(instruction string) [8]byte {
-	fullHash := sha256.Sum256([]byte("global:" + instruction))
+	fullHash := sha256.Sum256([]byte("global:" + ToSnakeCase(instruction)))
 	var discriminator [8]byte
 	copy(discriminator[:], fullHash[:8])
 	return discriminator
 }
 
+func ToSnakeCase(s string) string {
+	s = regexp.MustCompile(`([a-z0-9])([A-Z])`).ReplaceAllString(s, "${1}_${2}")
+	s = regexp.MustCompile(`([A-Z]+)([A-Z][a-z])`).ReplaceAllString(s, "${1}_${2}")
+	return strings.ToLower(s)
+}
+
 func GetRandomPubKey(t *testing.T) solana.PublicKey {
 	privKey, err := solana.NewRandomPrivateKey()
 	require.NoError(t, err)

pkg/solana/chainwriter/helpers_test.go

@@ -0,0 +1,29 @@
+package chainwriter_test
+
+import (
+	"testing"
+
+	"github.com/smartcontractkit/chainlink-solana/pkg/solana/chainwriter"
+)
+
+func TestToSnakeCase(t *testing.T) {
+	testCases := []struct {
+		input    string
+		expected string
+	}{
+		{"testCamelCase", "test_camel_case"},
+		{"oneword", "oneword"},
+		{"", ""},
+		{"testCamelCaseWithCAPS", "test_camel_case_with_caps"},
+		{"testCamelCaseWithCAPSAndNumbers123", "test_camel_case_with_caps_and_numbers123"},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.input, func(t *testing.T) {
+			actual := chainwriter.ToSnakeCase(tc.input)
+			if actual != tc.expected {
+				t.Errorf("expected %s, got %s", tc.expected, actual)
+			}
+		})
+	}
+}