feat(repo): add geth-rpc-gateway

packages/geth-rpc-gateway/.gitignore

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+geth-rpc-gateway

packages/geth-rpc-gateway/README.md

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+# geth-rpc-gateway
+
+```sh
+go build -o geth-rpc-gateway .
+```
+
+Build for Linux
+
+```sh
+GOOS=linux GOARCH=amd64 go build -o geth-rpc-gateway .
+```
+
+## How to test
+
+### Example code
+
+```
+curl --location --request POST 'https://rpc.internal.taiko.xyz/' \
+--header 'Content-Type: application/json' \
+--data-raw '{
+    "jsonrpc": "2.0",
+    "id": 4,
+    "method": "eth_blockNumber",
+    "params": [
+    ]
+}'
+```
+
+```
+'use strict'
+const { ethers } = require('ethers');
+
+// const provider = new ethers.providers.JsonRpcProvider("https://l1rpc.mainnet.taiko.xyz");
+
+const provider = new ethers.providers.WebSocketProvider("wss://ws.internal.taiko.xyz");
+
+async function main() {
+  console.log(await provider.getBlock("latest"));
+  process.exit(0);
+}
+
+main().catch(console.error);
+```
+
+```
+curl -i -X POST \
+   -H "Content-Type:application/json" \
+   -d \
+'[
+  {"id":92471,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0x832ef3260c46288e9596d0ddb61c4c9d5965f7da8d076483d08ac2d4265a69b8"]},
+  {"id":91112,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xbaac413b4cbf6a2f19ef3da2f103f8298042cbba2820fba020a322f9602f8e58"]},
+  {"id":48734,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0x7c649da4df9bea4552c05d4710a1ffb16fed5be81c11912aceb568a8212213d6"]},
+  {"id":45180,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xb23f58cb6b5155f792fa96c63962c44efba5280a4eed76400eca477e04c7456c"]},
+  {"id":95408,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xab7e06e9666ba0c270fe06e45fe604316049232c4479f975db0a0ec16b4f9b38"]},
+  {"id":193,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xd453488f5e14cfb3ac1057e42c1e3eb74420759fe0331894c59f3108e1c813b0"]}
+]' \
+ 'https://rpc.hekla.taiko.xyz/'
+```
+
+```
+curl -i -X POST \
+   -H "Content-Type:application/json" \
+   -d \
+'[
+  {"id":92471,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0x832ef3260c46288e9596d0ddb61c4c9d5965f7da8d076483d08ac2d4265a69b8"]},
+  {"id":91112,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xbaac413b4cbf6a2f19ef3da2f103f8298042cbba2820fba020a322f9602f8e58"]},
+  {"id":48734,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0x7c649da4df9bea4552c05d4710a1ffb16fed5be81c11912aceb568a8212213d6"]},
+  {"id":45180,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xb23f58cb6b5155f792fa96c63962c44efba5280a4eed76400eca477e04c7456c"]},
+  {"id":95408,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xab7e06e9666ba0c270fe06e45fe604316049232c4479f975db0a0ec16b4f9b38"]},
+  {"id":193,"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xd453488f5e14cfb3ac1057e42c1e3eb74420759fe0331894c59f3108e1c813b0"]}
+]' \
+ 'http://localhost:8080'
+```

packages/geth-rpc-gateway/main.go

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+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+
+	"github.com/gorilla/websocket"
+)
+
+type JSONRPCRequest struct {
+	Method string `json:"method"`
+}
+
+var (
+	upgrader             = websocket.Upgrader{CheckOrigin: func(r *http.Request) bool { return true }}
+	methodsUsingPrimary  map[string]bool
+	primaryURL           *url.URL
+	secondaryURL         *url.URL
+	webSocketURL         *url.URL
+	enableDebugEndpoints bool
+)
+
+func main() {
+	// Load the target URLs from environment variables
+	var err error
+	primaryURL, err = url.Parse(os.Getenv("TARGET_URL_PRIMARY"))
+	if err != nil || primaryURL == nil {
+		log.Fatalf("Failed to parse primary target URL: %v", err)
+	}
+	secondaryURL, err = url.Parse(os.Getenv("TARGET_URL_SECONDARY"))
+	if err != nil || secondaryURL == nil {
+		log.Fatalf("Failed to parse secondary target URL: %v", err)
+	}
+	webSocketURL, err = url.Parse(os.Getenv("WEBSOCKET_TARGET_URL"))
+	if err != nil || webSocketURL == nil {
+		log.Fatalf("Failed to parse WebSocket target URL: %v", err)
+	}
+
+	methodsUsingPrimary = parsePrimaryMethods(os.Getenv("PRIMARY_METHODS"))
+	enableDebugEndpoints = os.Getenv("ENABLE_DEBUG_ENDPOINTS") == "true"
+
+	http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("/healthz Received request: Method=%s, Path=%s", r.Method, r.URL.Path)
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("OK"))
+	})
+
+	// Determine if server should handle WebSocket or RPC based on environment variable
+	if os.Getenv("IS_WEBSOCKET") == "true" {
+		log.Println("Starting in WebSocket mode")
+		http.HandleFunc("/", rootWebSocketHandler) // WebSocket handler without CORS
+	} else {
+		log.Println("Starting in RPC mode")
+		http.Handle("/", enableCORS(http.HandlerFunc(rootHandler))) // HTTP handler with CORS middleware
+	}
+
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+// WebSocket handler for `/` path when in WebSocket mode
+func rootWebSocketHandler(w http.ResponseWriter, r *http.Request) {
+	// Check for WebSocket Upgrade
+	if strings.ToLower(r.Header.Get("Upgrade")) == "websocket" {
+		log.Printf("WebSocket connection initiated...")
+		handleWebSocket(w, r, webSocketURL)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte("OK"))
+}
+
+// CORS middleware to enable CORS headers
+func enableCORS(next http.Handler) http.Handler {
+	log.Printf("enableCORS")
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("CORS middleware invoked for %s %s", r.Method, r.URL.Path)
+
+		// Get the Origin header from the request
+		origin := r.Header.Get("Origin")
+
+		// Set Access-Control-Allow-Origin only if the request has an Origin header
+		if origin != "" {
+			log.Printf("CORS middleware invoked for origin %s", origin)
+			w.Header().Del("Access-Control-Allow-Origin") // Clear any existing header
+			w.Header().Set("Access-Control-Allow-Origin", origin)
+			w.Header().Set("Vary", "Origin") // Ensure caching based on origin
+		}
+
+		w.Header().Set("Access-Control-Allow-Methods", r.Method)
+		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
+
+		w.WriteHeader(http.StatusOK)
+
+		next.ServeHTTP(w, r)
+	})
+}
+
+func rootHandler(w http.ResponseWriter, r *http.Request) {
+	log.Printf("rootHandler...")
+
+	// Check for WebSocket Upgrade
+	if strings.ToLower(r.Header.Get("Upgrade")) == "websocket" {
+		handleWebSocket(w, r, webSocketURL)
+		return
+	}
+
+	// Handle HTTP requests
+
+	bodyBytes, err := ioutil.ReadAll(r.Body)
+
+	log.Printf("Handle HTTP requests...")
+	if err != nil {
+		log.Printf("Error")
+
+		http.Error(w, "Failed to read request body", http.StatusBadRequest)
+		return
+	}
+	defer r.Body.Close()
+
+	if len(bodyBytes) == 0 {
+		w.Write([]byte("OK"))
+		return
+	}
+
+	// Determine the target URL and extract methods
+	usePrimaryURL, methods := shouldUsePrimaryURL(bodyBytes)
+	var targetURL *url.URL
+	if usePrimaryURL {
+		targetURL = primaryURL
+		log.Printf("HTTP request hitting TARGET_URL_PRIMARY")
+	} else {
+		targetURL = secondaryURL
+		log.Printf("HTTP request hitting TARGET_URL_SECONDARY")
+	}
+
+	// Check each method for debug restrictions
+	for _, method := range methods {
+		if enableDebugEndpoints && isDebugMethod(method) && method != "debug_traceBlock" && method != "debug_traceBlockByNumber" {
+			http.Error(w, "Unsupported method", http.StatusBadRequest)
+			return
+		}
+	}
+
+	// Forward the original JSON payload as-is to the target URL
+	forwardRequest(w, r, targetURL, bodyBytes)
+}
+
+// Function to forward the request to the target URL
+func forwardRequest(w http.ResponseWriter, r *http.Request, targetURL *url.URL, bodyBytes []byte) {
+
+	proxyReq, err := http.NewRequest(r.Method, targetURL.String()+r.RequestURI, ioutil.NopCloser(bytes.NewReader(bodyBytes)))
+	if err != nil {
+		http.Error(w, "Failed to create request", http.StatusInternalServerError)
+		return
+	}
+
+	// Copy headers from the original request, excluding Accept-Encoding
+	for name, values := range r.Header {
+		log.Printf("proxy req name %s, value %s", name, values)
+		if name == "Accept-Encoding" {
+			continue
+		}
+		for _, value := range values {
+			proxyReq.Header.Add(name, value)
+		}
+	}
+
+	// Send the request to the target URL
+	resp, err := http.DefaultClient.Do(proxyReq)
+	if err != nil {
+		http.Error(w, "Failed to reach target server", http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
+
+	// Log headers before setting them to diagnose any discrepancies
+	log.Printf("Received Content-Type from upstream: %s", resp.Header.Get("Content-Type"))
+
+	// Prepare to copy headers from the response
+	for name, values := range resp.Header {
+		log.Printf("response name %s, value %s", name, values)
+		switch name {
+		case "Content-Length", "Transfer-Encoding", "Connection":
+			// Skip these headers
+			continue
+		default:
+			for _, value := range values {
+				w.Header().Add(name, value)
+			}
+		}
+	}
+
+	// Explicitly set Content-Type if it's present in the response
+	if contentType := resp.Header.Get("Content-Type"); contentType != "" {
+		w.Header().Set("Content-Type", contentType)
+	} else {
+		w.Header().Set("Content-Type", "application/json") // default if not provided
+	}
+	log.Printf("Set Content-Type header: %s", w.Header().Get("Content-Type"))
+
+	// Read the response body into a buffer to set Content-Type explicitly
+	var buf bytes.Buffer
+	if _, err := io.Copy(&buf, resp.Body); err != nil {
+		log.Printf("Error reading response body into buffer: %v", err)
+		http.Error(w, "Failed to read response body", http.StatusInternalServerError)
+		return
+	}
+
+	// Write status code and ensure Content-Type is set
+	w.WriteHeader(resp.StatusCode)
+	log.Printf("Response status code: %d", resp.StatusCode)
+	log.Printf("Final Content-Type header: %s", w.Header().Get("Content-Type"))
+
+	// Write the buffered body to the response
+	if _, err := io.Copy(w, &buf); err != nil {
+		log.Printf("Error copying buffer to response: %v", err)
+	}
+}
+
+func isDebugMethod(method string) bool {
+	return len(method) >= 6 && method[:6] == "debug_" && method != "debug_traceBlock"
+}
+
+// Parses the PRIMARY_METHODS environment variable and returns a map of methods using the primary URL
+func parsePrimaryMethods(methods string) map[string]bool {
+	methodMap := make(map[string]bool)
+	for _, method := range strings.Split(methods, ",") {
+		method = strings.TrimSpace(method)
+		if method != "" {
+			methodMap[method] = true
+		}
+	}
+	return methodMap
+}
+
+// Checks if any method should use the primary URL and returns all methods
+func shouldUsePrimaryURL(bodyBytes []byte) (bool, []string) {
+	var singleRequest JSONRPCRequest
+	var multipleRequests []JSONRPCRequest
+	methods := []string{}
+
+	// Try unmarshalling as a single request
+	if err := json.Unmarshal(bodyBytes, &singleRequest); err == nil {
+		methods = append(methods, singleRequest.Method)
+		return methodsUsingPrimary[singleRequest.Method], methods
+	}
+
+	// Try unmarshalling as an array of requests
+	if err := json.Unmarshal(bodyBytes, &multipleRequests); err == nil {
+		usePrimary := false
+		for _, req := range multipleRequests {
+			methods = append(methods, req.Method)
+			if methodsUsingPrimary[req.Method] {
+				usePrimary = true
+			}
+		}
+		return usePrimary, methods
+	}
+
+	log.Printf("Invalid JSON in request body: unable to parse as single or multiple requests")
+	return false, methods // Default to secondary URL if JSON is invalid
+}
+
+func handleWebSocket(w http.ResponseWriter, r *http.Request, targetURL *url.URL) {
+	clientConn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Printf("Failed to upgrade connection: %v", err)
+		http.Error(w, "Failed to upgrade to WebSocket", http.StatusInternalServerError)
+		return
+	}
+	defer clientConn.Close()
+
+	targetConn, _, err := websocket.DefaultDialer.Dial(targetURL.String(), nil)
+	if err != nil {
+		log.Printf("Failed to connect to target WebSocket server: %v", err)
+		http.Error(w, "Failed to connect to target WebSocket server", http.StatusInternalServerError)
+		return
+	}
+	defer targetConn.Close()
+
+	go func() {
+		for {
+			messageType, message, err := clientConn.ReadMessage()
+			if err != nil {
+				log.Printf("Error reading message from client: %v", err)
+				return
+			}
+			if err := targetConn.WriteMessage(messageType, message); err != nil {
+				log.Printf("Error writing message to target server: %v", err)
+				return
+			}
+		}
+	}()
+
+	for {
+		messageType, message, err := targetConn.ReadMessage()
+		if err != nil {
+			log.Printf("Error reading message from target server: %v", err)
+			return
+		}
+		if err := clientConn.WriteMessage(messageType, message); err != nil {
+			log.Printf("Error writing message to client: %v", err)
+			return
+		}
+	}
+}