fix(mcms): select public rpc for fork tests

Author: gustavogama-cll

.changeset/fine-cups-battle.md

@@ -0,0 +1,5 @@
+---
+"chainlink-deployments-framework": patch
+---
+
+fix(mcms): select public rpc for fork tests

engine/cld/legacy/cli/mcmsv2/mcms_v2.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"math/big"
 	"os"
+	"regexp"
 	"slices"
 	"strings"
 	"time"
@@ -620,8 +621,10 @@ func buildExecuteForkCommand(lggr logger.Logger, domain cldf_domain.Domain, prop
 				return fmt.Errorf("error creating config: %w", err)
 			}
 
-			// get the chain URL, chain ID and MCM contract address
-			url := cfg.forkedEnv.ChainConfigs[cfg.chainSelector].HTTPRPCs[0].External
+			url, err := selectPublicRPC(cfg.forkedEnv, cfg.chainSelector)
+			if err != nil {
+				return fmt.Errorf("failed to select RPC for fork test: %w", err)
+			}
 			anvilClient := rpc.New(url, nil)
 			chainID := cfg.forkedEnv.ChainConfigs[cfg.chainSelector].ChainID
 			mcmsAddr := cfg.proposal.ChainMetadata[types.ChainSelector(cfg.chainSelector)].MCMAddress
@@ -1627,3 +1630,19 @@ func createRendererFromFormat(format string) (analyzer.Renderer, error) {
 		return nil, fmt.Errorf("unknown format '%s'", format)
 	}
 }
+
+func selectPublicRPC(env cldfenvironment.ForkedEnvironment, chainSelector uint64) (string, error) {
+	for _, rpc := range env.ChainConfigs[chainSelector].HTTPRPCs {
+		if !isPrivateRPC(rpc.External) {
+			return rpc.External, nil
+		}
+	}
+
+	return "", fmt.Errorf("no public RPCs found for chain %d", chainSelector)
+}
+
+var privateRpcRegexp = regexp.MustCompile(`^https?://(rpcs|gap\-.*\.(prod|stage))\.cldev\.sh/`)
+
+func isPrivateRPC(url string) bool {
+	return privateRpcRegexp.MatchString(url)
+}

engine/cld/legacy/cli/mcmsv2/mcms_v2_test.go

@@ -524,3 +524,39 @@ func Test_timelockExecuteOptions(t *testing.T) {
 		})
 	}
 }
+
+func Test_isPrivateRPC(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		url  string
+		want bool
+	}{
+		{"http://rpcs.cldev.sh/", true},
+		{"https://rpcs.cldev.sh/", true},
+		{"https://rpcs.cldev.sh/anything", true},
+		{"https://gap-rpcs.stage.cldev.sh/anything", true},
+		{"https://gap-rpcs.prod.cldev.sh/anything", true},
+		{"https://gap-other.prod.cldev.sh/anything", true},
+		{"https://gap-other.stage.cldev.sh/anything", true},
+		{"https://gap-other.stage.cldev.sh/anything", true},
+		{"https://gap-grpc-job-distributor.public.main.prod.cldev.sh/", true},
+		{"https://gap-ws-job-distributor.public.main.prod.cldev.sh/", true},
+		{"https://gap-rpc-proxy.public.main.prod.cldev.sh/", true},
+		{"https://gap-grpc-job-distributor.public.main.stage.cldev.sh/", true},
+		{"https://gap-ws-job-distributor.public.main.stage.cldev.sh/", true},
+		{"https://gap-grpc-chainlink-catalog.public.main.stage.cldev.sh/", true},
+		{"", false},
+		{"http://", false},
+		{"https://", false},
+		{"https://rpcs.cldev.sh", false},
+		{"https://rpcs.prod.cldev.sh/anything", false},
+		{"https://rpcs.stage.cldev.sh/anything", false},
+		{"https://gap.stage.cldev.sh/anything", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.url, func(t *testing.T) {
+			t.Parallel()
+			require.Equal(t, tt.want, isPrivateRPC(tt.url))
+		})
+	}
+}