Added DynamicEIP1559Gas Provider

Signed-off-by: Nischal Sharma <nischal@web3labs.com>

Author: NickSneo

core/src/main/java/org/web3j/tx/gas/ContractGasProvider.java

@@ -17,9 +17,7 @@
 import java.math.BigInteger;
 
 public interface ContractGasProvider {
-    BigInteger getGasPrice(String contractFunc);
 
-    @Deprecated
     BigInteger getGasPrice();
 
     BigInteger getGasLimit(Transaction transaction);

core/src/main/java/org/web3j/tx/gas/DynamicEIP1559GasProvider.java

@@ -0,0 +1,88 @@
+package org.web3j.tx.gas;
+
+import org.web3j.protocol.Web3j;
+import org.web3j.protocol.core.methods.request.Transaction;
+import org.web3j.protocol.core.methods.response.EthGasPrice;
+import org.web3j.protocol.core.methods.response.EthMaxPriorityFeePerGas;
+
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
+public class DynamicEIP1559GasProvider implements ContractEIP1559GasProvider, PriorityGasProvider{
+    private Web3j web3j;
+    private long chainId;
+    private final Priority priority;
+    private final BigDecimal customMultiplier;
+
+    public DynamicEIP1559GasProvider(Web3j web3j, long chainId) {
+        this(web3j, chainId, Priority.NORMAL);
+    }
+
+    public DynamicEIP1559GasProvider(Web3j web3j, long chainId, Priority priority) {
+        this(web3j, chainId, priority, BigDecimal.ONE);
+    }
+
+    public DynamicEIP1559GasProvider(Web3j web3j, long chainId, Priority priority, BigDecimal customMultiplier) {
+        this.web3j = web3j;
+        this.chainId = chainId;
+        this.priority = priority;
+        this.customMultiplier = customMultiplier;
+    }
+
+    @Override
+    public boolean isEIP1559Enabled() {
+        return true;
+    }
+
+    @Override
+    public long getChainId() {
+        return chainId;
+    }
+
+    @Override
+    public BigInteger getMaxFeePerGas(String contractFunc) {
+        return getGasPrice();
+    }
+
+    @Override
+    public BigInteger getMaxPriorityFeePerGas(String contractFunc) {
+        try {
+            EthMaxPriorityFeePerGas ethMaxPriorityFeePerGas = web3j.ethMaxPriorityFeePerGas().send();
+            if (ethMaxPriorityFeePerGas.hasError()) {
+                throw new RuntimeException("Error fetching ethMaxPriorityFeePerGas: " + ethMaxPriorityFeePerGas.getError().getMessage());
+            }
+            return ethMaxPriorityFeePerGas.getMaxPriorityFeePerGas();
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to get ethMaxPriorityFeePerGas");
+        }
+
+    }
+
+    @Override
+    public BigInteger getGasPrice() {
+        return applyPriority(fetchCurrentGasPrice(), priority, customMultiplier);
+    }
+
+    @Override
+    public BigInteger getGasLimit(Transaction transaction) {
+        return null;
+    }
+
+    @Override
+    public BigInteger getGasLimit() {
+        return null;
+    }
+
+    private BigInteger fetchCurrentGasPrice() {
+        try {
+            EthGasPrice ethGasPrice = web3j.ethGasPrice().send();
+            if (ethGasPrice.hasError()) {
+                throw new RuntimeException("Error fetching gas price: " + ethGasPrice.getError().getMessage());
+            }
+            return ethGasPrice.getGasPrice();
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to fetch gas price", e);
+        }
+    }
+}

core/src/main/java/org/web3j/tx/gas/DynamicGasProvider.java

@@ -31,12 +31,7 @@ public DynamicGasProvider(Web3j web3j, Priority priority, BigDecimal customMulti
 
     @Override
     public BigInteger getGasPrice() {
-        return calculateGasPrice(fetchCurrentGasPrice(), priority, customMultiplier);
-    }
-
-    @Override
-    public BigInteger getGasPrice(String contractFunc) {
-        return calculateGasPrice(fetchCurrentGasPrice(), priority, customMultiplier);
+        return applyPriority(fetchCurrentGasPrice(), priority, customMultiplier);
     }
 
     @Override
@@ -68,9 +63,4 @@ private BigInteger fetchCurrentGasPrice() {
             throw new RuntimeException("Failed to fetch gas price", e);
         }
     }
-
-    @Override
-    public BigInteger calculateGasPrice(BigInteger baseGasPrice, Priority priority, BigDecimal customMultiplier) {
-        return applyPriority(baseGasPrice, priority, customMultiplier);
-    }
 }

core/src/main/java/org/web3j/tx/gas/PriorityGasProvider.java

@@ -10,9 +10,6 @@ enum Priority {
         SLOW,
         CUSTOM
     }
-
-    BigInteger calculateGasPrice(BigInteger baseGasPrice, Priority priority, BigDecimal customMultiplier);
-
     default BigInteger applyPriority(BigInteger baseGasPrice, Priority priority, BigDecimal customMultiplier) {
 
         return switch (priority) {

core/src/main/java/org/web3j/tx/gas/StaticEIP1559GasProvider.java

@@ -33,11 +33,6 @@ public StaticEIP1559GasProvider(
         this.gasLimit = gasLimit;
     }
 
-    @Override
-    public BigInteger getGasPrice(String contractFunc) {
-        return maxFeePerGas;
-    }
-
     @Override
     public BigInteger getGasPrice() {
         return maxFeePerGas;

core/src/main/java/org/web3j/tx/gas/StaticGasProvider.java

@@ -26,11 +26,6 @@ public StaticGasProvider(BigInteger gasPrice, BigInteger gasLimit) {
         this.gasLimit = gasLimit;
     }
 
-    @Override
-    public BigInteger getGasPrice(String contractFunc) {
-        return gasPrice;
-    }
-
     @Override
     public BigInteger getGasPrice() {
         return gasPrice;