Refactor EVMFrontend to use EtherscanAPIManager for API requests (#55)

Author: merendamattia

src/main/java/it/unipr/EVMLiSA.java

@@ -805,7 +805,7 @@ private void setupGlobalOptions(CommandLine cmd) {
 		if (cmd.hasOption("use-live-storage") && (cmd.hasOption("address") || cmd.hasOption("benchmark")))
 			EVMAbstractState.setUseStorageLive();
 		if (cmd.hasOption("etherscan-api-key"))
-			EVMFrontend.setEtherscanAPIKey(cmd.getOptionValue("etherscan-api-key"));
+			EtherscanAPIManager.setAPIKey(cmd.getOptionValue("etherscan-api-key"));
 		if (cmd.hasOption("test-mode"))
 			EVMLiSA.setTestMode();
 		if (cmd.hasOption("paper-stats"))

src/main/java/it/unipr/analysis/EVMAbstractState.java

@@ -2,7 +2,7 @@
 
 import it.unipr.cfg.EVMCFG;
 import it.unipr.cfg.ProgramCounterLocation;
-import it.unipr.frontend.EVMFrontend;
+import it.unipr.utils.EtherscanAPIManager;
 import it.unipr.utils.MyCache;
 import it.unive.lisa.analysis.BaseLattice;
 import it.unive.lisa.analysis.Lattice;
@@ -2129,7 +2129,8 @@ public StackElement getStorageAt(Number key, String address) {
 			String getStorageAtRequest;
 			synchronized (MyCache.getInstance()) {
 				Thread.sleep(500);
-				getStorageAtRequest = EVMFrontend.etherscanRequest("proxy", "eth_getStorageAt", hexString, address);
+				getStorageAtRequest = EtherscanAPIManager.etherscanRequest("proxy", "eth_getStorageAt", hexString,
+						address);
 			}
 
 			if (getStorageAtRequest == null || getStorageAtRequest.isEmpty()) {