refactor(proxy): cache only immutable and hash-based methods

proxyd/cache.go

@@ -116,15 +116,17 @@ type rpcCache struct {
 	handlers map[string]RPCMethodHandler
 }
 
-func newRPCCache(cache Cache, getLatestBlockNumFn GetLatestBlockNumFn, getLatestGasPriceFn GetLatestGasPriceFn, numBlockConfirmations int) RPCCache {
+func newRPCCache(cache Cache) RPCCache {
 	handlers := map[string]RPCMethodHandler{
-		"eth_chainId":          &StaticMethodHandler{},
-		"net_version":          &StaticMethodHandler{},
-		"eth_getBlockByNumber": &EthGetBlockByNumberMethodHandler{cache, getLatestBlockNumFn, numBlockConfirmations},
-		"eth_getBlockRange":    &EthGetBlockRangeMethodHandler{cache, getLatestBlockNumFn, numBlockConfirmations},
-		"eth_blockNumber":      &EthBlockNumberMethodHandler{getLatestBlockNumFn},
-		"eth_gasPrice":         &EthGasPriceMethodHandler{getLatestGasPriceFn},
-		"eth_call":             &EthCallMethodHandler{cache, getLatestBlockNumFn, numBlockConfirmations},
+		"eth_chainId":                           &StaticMethodHandler{cache: cache},
+		"net_version":                           &StaticMethodHandler{cache: cache},
+		"eth_getBlockTransactionCountByHash":    &StaticMethodHandler{cache: cache},
+		"eth_getUncleCountByBlockHash":          &StaticMethodHandler{cache: cache},
+		"eth_getBlockByHash":                    &StaticMethodHandler{cache: cache},
+		"eth_getTransactionByHash":              &StaticMethodHandler{cache: cache},
+		"eth_getTransactionByBlockHashAndIndex": &StaticMethodHandler{cache: cache},
+		"eth_getUncleByBlockHashAndIndex":       &StaticMethodHandler{cache: cache},
+		"eth_getTransactionReceipt":             &StaticMethodHandler{cache: cache},
 	}
 	return &rpcCache{
 		cache:    cache,
@@ -138,13 +140,15 @@ func (c *rpcCache) GetRPC(ctx context.Context, req *RPCReq) (*RPCRes, error) {
 		return nil, nil
 	}
 	res, err := handler.GetRPCMethod(ctx, req)
-	if res != nil {
+	if err != nil {
+		RecordCacheError(req.Method)
+		return nil, err
+	}
 	if res == nil {
 		RecordCacheMiss(req.Method)
 	} else {
 		RecordCacheHit(req.Method)
 	}
-	}
 	return res, err
 }
 

proxyd/integration_tests/caching_test.go

@@ -18,15 +18,19 @@ func TestCaching(t *testing.T) {
 	defer redis.Close()
 
 	hdlr := NewBatchRPCResponseRouter()
+	/* cacheable */
 	hdlr.SetRoute("eth_chainId", "999", "0x420")
 	hdlr.SetRoute("net_version", "999", "0x1234")
-	hdlr.SetRoute("eth_blockNumber", "999", "0x64")
-	hdlr.SetRoute("eth_getBlockByNumber", "999", "dummy_block")
-	hdlr.SetRoute("eth_call", "999", "dummy_call")
-
-	// mock LVC requests
-	hdlr.SetFallbackRoute("eth_blockNumber", "0x64")
-	hdlr.SetFallbackRoute("eth_gasPrice", "0x420")
+	hdlr.SetRoute("eth_getBlockTransactionCountByHash", "999", "eth_getBlockTransactionCountByHash")
+	hdlr.SetRoute("eth_getBlockByHash", "999", "eth_getBlockByHash")
+	hdlr.SetRoute("eth_getTransactionByHash", "999", "eth_getTransactionByHash")
+	hdlr.SetRoute("eth_getTransactionByBlockHashAndIndex", "999", "eth_getTransactionByBlockHashAndIndex")
+	hdlr.SetRoute("eth_getUncleByBlockHashAndIndex", "999", "eth_getUncleByBlockHashAndIndex")
+	hdlr.SetRoute("eth_getTransactionReceipt", "999", "eth_getTransactionReceipt")
+	/* not cacheable */
+	hdlr.SetRoute("eth_getBlockByNumber", "999", "eth_getBlockByNumber")
+	hdlr.SetRoute("eth_blockNumber", "999", "eth_blockNumber")
+	hdlr.SetRoute("eth_call", "999", "eth_call")
 
 	backend := NewMockBackend(hdlr)
 	defer backend.Close()
@@ -48,6 +52,7 @@ func TestCaching(t *testing.T) {
 		response     string
 		backendCalls int
 	}{
+		/* cacheable */
 		{
 			"eth_chainId",
 			nil,
@@ -60,14 +65,51 @@ func TestCaching(t *testing.T) {
 			"{\"jsonrpc\": \"2.0\", \"result\": \"0x1234\", \"id\": 999}",
 			1,
 		},
+		{
+			"eth_getBlockTransactionCountByHash",
+			[]interface{}{"0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"},
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_getBlockTransactionCountByHash\", \"id\": 999}",
+			1,
+		},
+		{
+			"eth_getBlockByHash",
+			[]interface{}{"0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "false"},
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_getBlockByHash\", \"id\": 999}",
+			1,
+		},
+		{
+			"eth_getTransactionByHash",
+			[]interface{}{"0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b"},
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_getTransactionByHash\", \"id\": 999}",
+			1,
+		},
+		{
+			"eth_getTransactionByBlockHashAndIndex",
+			[]interface{}{"0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331", "0x55"},
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_getTransactionByBlockHashAndIndex\", \"id\": 999}",
+			1,
+		},
+		{
+			"eth_getUncleByBlockHashAndIndex",
+			[]interface{}{"0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238", "0x90"},
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_getUncleByBlockHashAndIndex\", \"id\": 999}",
+			1,
+		},
+		{
+			"eth_getTransactionReceipt",
+			[]interface{}{"0x85d995eba9763907fdf35cd2034144dd9d53ce32cbec21349d4b12823c6860c5"},
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_getTransactionReceipt\", \"id\": 999}",
+			1,
+		},
+		/* not cacheable */
 		{
 			"eth_getBlockByNumber",
 			[]interface{}{
 				"0x1",
 				true,
 			},
-			"{\"jsonrpc\": \"2.0\", \"result\": \"dummy_block\", \"id\": 999}",
-			1,
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_getBlockByNumber\", \"id\": 999}",
+			2,
 		},
 		{
 			"eth_call",
@@ -79,14 +121,14 @@ func TestCaching(t *testing.T) {
 				},
 				"0x60",
 			},
-			"{\"id\":999,\"jsonrpc\":\"2.0\",\"result\":\"dummy_call\"}",
-			1,
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_call\", \"id\": 999}",
+			2,
 		},
 		{
 			"eth_blockNumber",
 			nil,
-			"{\"id\":999,\"jsonrpc\":\"2.0\",\"result\":\"0x64\"}",
-			0,
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_blockNumber\", \"id\": 999}",
+			2,
 		},
 		{
 			"eth_call",
@@ -98,7 +140,7 @@ func TestCaching(t *testing.T) {
 				},
 				"latest",
 			},
-			"{\"id\":999,\"jsonrpc\":\"2.0\",\"result\":\"dummy_call\"}",
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_call\", \"id\": 999}",
 			2,
 		},
 		{
@@ -111,7 +153,7 @@ func TestCaching(t *testing.T) {
 				},
 				"pending",
 			},
-			"{\"id\":999,\"jsonrpc\":\"2.0\",\"result\":\"dummy_call\"}",
+			"{\"jsonrpc\": \"2.0\", \"result\": \"eth_call\", \"id\": 999}",
 			2,
 		},
 	}
@@ -128,24 +170,15 @@ func TestCaching(t *testing.T) {
 		})
 	}
 
-	t.Run("block numbers update", func(t *testing.T) {
-		hdlr.SetFallbackRoute("eth_blockNumber", "0x100")
-		time.Sleep(1500 * time.Millisecond)
-		resRaw, _, err := client.SendRPC("eth_blockNumber", nil)
-		require.NoError(t, err)
-		RequireEqualJSON(t, []byte("{\"id\":999,\"jsonrpc\":\"2.0\",\"result\":\"0x100\"}"), resRaw)
-		backend.Reset()
-	})
-
 	t.Run("nil responses should not be cached", func(t *testing.T) {
-		hdlr.SetRoute("eth_getBlockByNumber", "999", nil)
-		resRaw, _, err := client.SendRPC("eth_getBlockByNumber", []interface{}{"0x123"})
+		hdlr.SetRoute("eth_getBlockByHash", "999", nil)
+		resRaw, _, err := client.SendRPC("eth_getBlockByHash", []interface{}{"0x123"})
 		require.NoError(t, err)
-		resCache, _, err := client.SendRPC("eth_getBlockByNumber", []interface{}{"0x123"})
+		resCache, _, err := client.SendRPC("eth_getBlockByHash", []interface{}{"0x123"})
 		require.NoError(t, err)
 		RequireEqualJSON(t, []byte("{\"id\":999,\"jsonrpc\":\"2.0\",\"result\":null}"), resRaw)
 		RequireEqualJSON(t, resRaw, resCache)
-		require.Equal(t, 2, countRequests(backend, "eth_getBlockByNumber"))
+		require.Equal(t, 2, countRequests(backend, "eth_getBlockByHash"))
 	})
 }
 
@@ -158,10 +191,7 @@ func TestBatchCaching(t *testing.T) {
 	hdlr.SetRoute("eth_chainId", "1", "0x420")
 	hdlr.SetRoute("net_version", "1", "0x1234")
 	hdlr.SetRoute("eth_call", "1", "dummy_call")
-
-	// mock LVC requests
-	hdlr.SetFallbackRoute("eth_blockNumber", "0x64")
-	hdlr.SetFallbackRoute("eth_gasPrice", "0x420")
+	hdlr.SetRoute("eth_getBlockByHash", "1", "eth_getBlockByHash")
 
 	backend := NewMockBackend(hdlr)
 	defer backend.Close()
@@ -181,26 +211,31 @@ func TestBatchCaching(t *testing.T) {
 	goodChainIdResponse := "{\"jsonrpc\": \"2.0\", \"result\": \"0x420\", \"id\": 1}"
 	goodNetVersionResponse := "{\"jsonrpc\": \"2.0\", \"result\": \"0x1234\", \"id\": 1}"
 	goodEthCallResponse := "{\"jsonrpc\": \"2.0\", \"result\": \"dummy_call\", \"id\": 1}"
+	goodEthGetBlockByHash := "{\"jsonrpc\": \"2.0\", \"result\": \"eth_getBlockByHash\", \"id\": 1}"
 
 	res, _, err := client.SendBatchRPC(
 		NewRPCReq("1", "eth_chainId", nil),
 		NewRPCReq("1", "net_version", nil),
+		NewRPCReq("1", "eth_getBlockByHash", []interface{}{"0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "false"}),
 	)
 	require.NoError(t, err)
-	RequireEqualJSON(t, []byte(asArray(goodChainIdResponse, goodNetVersionResponse)), res)
+	RequireEqualJSON(t, []byte(asArray(goodChainIdResponse, goodNetVersionResponse, goodEthGetBlockByHash)), res)
 	require.Equal(t, 1, countRequests(backend, "eth_chainId"))
 	require.Equal(t, 1, countRequests(backend, "net_version"))
+	require.Equal(t, 1, countRequests(backend, "eth_getBlockByHash"))
 
 	backend.Reset()
 	res, _, err = client.SendBatchRPC(
 		NewRPCReq("1", "eth_chainId", nil),
 		NewRPCReq("1", "eth_call", []interface{}{`{"to":"0x1234"}`, "pending"}),
 		NewRPCReq("1", "net_version", nil),
+		NewRPCReq("1", "eth_getBlockByHash", []interface{}{"0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "false"}),
 	)
 	require.NoError(t, err)
-	RequireEqualJSON(t, []byte(asArray(goodChainIdResponse, goodEthCallResponse, goodNetVersionResponse)), res)
+	RequireEqualJSON(t, []byte(asArray(goodChainIdResponse, goodEthCallResponse, goodNetVersionResponse, goodEthGetBlockByHash)), res)
 	require.Equal(t, 0, countRequests(backend, "eth_chainId"))
 	require.Equal(t, 0, countRequests(backend, "net_version"))
+	require.Equal(t, 0, countRequests(backend, "eth_getBlockByHash"))
 	require.Equal(t, 1, countRequests(backend, "eth_call"))
 }
 

proxyd/integration_tests/testdata/caching.toml

@@ -27,3 +27,10 @@ net_version = "main"
 eth_getBlockByNumber = "main"
 eth_blockNumber = "main"
 eth_call = "main"
+eth_getBlockTransactionCountByHash = "main"
+eth_getUncleCountByBlockHash = "main"
+eth_getBlockByHash = "main"
+eth_getTransactionByHash = "main"
+eth_getTransactionByBlockHashAndIndex = "main"
+eth_getUncleByBlockHashAndIndex = "main"
+eth_getTransactionReceipt = "main"

proxyd/metrics.go

@@ -182,6 +182,14 @@ var (
 		"method",
 	})
 
+	cacheErrorsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: MetricsNamespace,
+		Name:      "cache_errors_total",
+		Help:      "Number of cache errors.",
+	}, []string{
+		"method",
+	})
+
 	lvcErrorsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
 		Namespace: MetricsNamespace,
 		Name:      "lvc_errors_total",
@@ -374,6 +382,10 @@ func RecordCacheMiss(method string) {
 	cacheMissesTotal.WithLabelValues(method).Inc()
 }
 
+func RecordCacheError(method string) {
+	cacheMissesTotal.WithLabelValues(method).Inc()
+}
+
 func RecordBatchSize(size int) {
 	batchSizeHistogram.Observe(float64(size))
 }

proxyd/proxyd.go

@@ -213,17 +213,10 @@ func Start(config *Config) (*Server, func(), error) {
 	}
 
 	var (
+		cache    Cache
 		rpcCache RPCCache
-		blockNumLVC *EthLastValueCache
-		gasPriceLVC *EthLastValueCache
 	)
 	if config.Cache.Enabled {
-		var (
-			cache      Cache
-			blockNumFn GetLatestBlockNumFn
-			gasPriceFn GetLatestGasPriceFn
-		)
-
 		if config.Cache.BlockSyncRPCURL == "" {
 			return nil, nil, fmt.Errorf("block sync node required for caching")
 		}
@@ -245,9 +238,7 @@ func Start(config *Config) (*Server, func(), error) {
 		}
 		defer ethClient.Close()
 
-		blockNumLVC, blockNumFn = makeGetLatestBlockNumFn(ethClient, cache)
-		gasPriceLVC, gasPriceFn = makeGetLatestGasPriceFn(ethClient, cache)
-		rpcCache = newRPCCache(newCacheWithCompression(cache), blockNumFn, gasPriceFn, config.Cache.NumBlockConfirmations)
+		rpcCache = newRPCCache(newCacheWithCompression(cache))
 	}
 
 	srv, err := NewServer(
@@ -345,12 +336,6 @@ func Start(config *Config) (*Server, func(), error) {
 
 	shutdownFunc := func() {
 		log.Info("shutting down proxyd")
-		if blockNumLVC != nil {
-			blockNumLVC.Stop()
-		}
-		if gasPriceLVC != nil {
-			gasPriceLVC.Stop()
-		}
 		srv.Shutdown()
 		if err := lim.FlushBackendWSConns(backendNames); err != nil {
 			log.Error("error flushing backend ws conns", "err", err)