[DX-3567] save price provider logs to a file

.github/workflows/cre-soak-memory-leak.yml

@@ -28,7 +28,7 @@ jobs:
     environment:
       name: integration
       deployment: false
-    runs-on: runs-on=${{ github.run_id }}/cpu=8+16/ram=32+64/family=c6id+m6id+m6idn/spot=false/image=ubuntu24-full-x64/extras=s3-cache
+    runs-on: runs-on=${{ github.run_id }}/cpu=32/ram=128/family=m6id+m6idn/spot=false/image=ubuntu24-full-x64/extras=s3-cache
     timeout-minutes: 270 # 4h30m — test timeout is 4h20m
     permissions:
       contents: read
@@ -43,6 +43,7 @@ jobs:
 
     steps:
       - name: Enable S3 Cache for Self-Hosted Runners
+        if: ${{ env.RUNS_ON_INSTANCE_ID != '' && env.ACTIONS_CACHE_URL != '' }}
         uses: runs-on/action@742bf56072eb4845a0f94b3394673e4903c90ff0 # v2.1.0
         with:
           metrics: cpu,network,memory,disk

system-tests/tests/soak/cre/soak_test.go

@@ -5,10 +5,13 @@ import (
 	"fmt"
 	"math/big"
 	"os"
+	"path/filepath"
 	"testing"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog"
 	"github.com/stretchr/testify/require"
 
 	"github.com/smartcontractkit/chainlink-evm/gethwrappers/data-feeds/generated/data_feeds_cache"
@@ -56,8 +59,34 @@ func Test_CRE_PoR_MemoryLeakSoak(t *testing.T) {
 	// registered.  Subsequent calls to setupFakeDataProvider would overwrite the
 	// HTTP handler and make previously-registered feeds return 400.
 	allFeedIDs := smokecre.GenerateSoakFeedIDs(numWorkflows)
+
+	logFileName := fmt.Sprintf("./%s-%s/soak-fake-price-provider.log", framework.DefaultCTFLogsDir, t.Name())
+	if _, err := os.Stat(filepath.Dir(logFileName)); os.IsNotExist(err) {
+		require.NoError(t, os.MkdirAll(filepath.Dir(logFileName), 0755), "failed to create directory %s", filepath.Dir(logFileName))
+	}
+	ppLogFile, openErr := os.OpenFile(logFileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o644)
+	require.NoError(t, openErr, "failed to open %d", logFileName)
+	oldGinDefaultWriter := gin.DefaultWriter
+	oldGinDefaultErrorWriter := gin.DefaultErrorWriter
+	// fake.NewFakeDataProvider uses gin.Default(), so redirect Gin's global request/error
+	// output to the soak provider log file to avoid flooding the main test logs.
+	gin.DefaultWriter = ppLogFile
+	gin.DefaultErrorWriter = ppLogFile
+	t.Cleanup(func() {
+		gin.DefaultWriter = oldGinDefaultWriter
+		gin.DefaultErrorWriter = oldGinDefaultErrorWriter
+	})
+
+	soakPPLogger := zerolog.New(ppLogFile).
+		Level(framework.L.GetLevel()).
+		With().
+		Timestamp().
+		Str("component", "soak-fake-price-provider").
+		Logger()
+	framework.L.Info().Str("path", logFileName).Msg("redirecting soak fake price provider logs to file")
+
 	priceProvider, err := smokecre.NewFakePriceProviderForSoak(
-		framework.L, testEnv.Config.Fake, "", allFeedIDs,
+		soakPPLogger, testEnv.Config.Fake, "", allFeedIDs,
 	)
 	require.NoError(t, err, "failed to create soak price provider")