Online services implementation

codegen/src/main/java/org/web3j/codegen/Console.java

@@ -27,4 +27,8 @@ public static void exitSuccess(String message) {
         System.out.println(message);
         System.exit(0);
     }
+
+    public static void exitSuccess() {
+        System.exit(0);
+    }
 }

core/src/main/java/org/web3j/account/LocalWeb3jAccount.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2020 Web3 Labs Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package org.web3j.account;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+import org.web3j.protocol.Network;
+import org.web3j.protocol.http.HttpService;
+
+public class LocalWeb3jAccount {
+
+    private static final Path EPIRUS_CONFIG_PATh =
+            Paths.get(System.getProperty("user.home"), ".epirus", ".config");
+
+    private static String NODE_RPC_ENDPOINT = "https://%s-eth.epirus.io/%s";
+
+    public static HttpService getOnlineServicesHttpService(final Network network) throws Exception {
+        if (configExists()) {
+
+            final ObjectNode node = readConfigAsJson();
+            if (loginTokenExists(node)) {
+                return createHttpServiceWithToken(network);
+            }
+        }
+        throw new IllegalStateException(
+                "Config file does not exist or could not be read. In order to use Web3j without a specified endpoint, you must use the CLI and log in to Web3j Cloud");
+    }
+
+    public static boolean configExists() {
+        return EPIRUS_CONFIG_PATh.toFile().exists();
+    }
+
+    public static ObjectNode readConfigAsJson() throws IOException {
+        String configContents = new String(Files.readAllBytes(EPIRUS_CONFIG_PATh));
+        return new ObjectMapper().readValue(configContents, ObjectNode.class);
+    }
+
+    public static boolean loginTokenExists(ObjectNode node) {
+        return node.has("loginToken");
+    }
+
+    public static HttpService createHttpServiceWithToken(Network network) throws IOException {
+        String httpEndpoint =
+                String.format(
+                        NODE_RPC_ENDPOINT,
+                        network.getNetworkName(),
+                        readConfigAsJson().get("loginToken").asText());
+        return new HttpService(httpEndpoint);
+    }
+}

core/src/main/java/org/web3j/protocol/Network.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2020 Web3 Labs Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package org.web3j.protocol;
+
+public enum Network {
+    MAINNET("mainnet"),
+    ROPSTEN("ropsten"),
+    KOVAN("kovan"),
+    GORLI("gorli"),
+    RINKEBY("rinkeby");
+
+    public String getNetworkName() {
+        return network;
+    }
+
+    String network;
+
+    Network(final String network) {
+        this.network = network;
+    }
+}

core/src/main/java/org/web3j/protocol/Web3j.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020 Web3 Labs Ltd.
+ * Copyright 2019 Web3 Labs Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -14,6 +14,7 @@
 
 import java.util.concurrent.ScheduledExecutorService;
 
+import org.web3j.account.LocalWeb3jAccount;
 import org.web3j.protocol.core.Batcher;
 import org.web3j.protocol.core.Ethereum;
 import org.web3j.protocol.core.JsonRpc2_0Web3j;
@@ -22,6 +23,14 @@
 /** JSON-RPC Request object building factory. */
 public interface Web3j extends Ethereum, Web3jRx, Batcher {
 
+    static Web3j build() throws Exception {
+        return new JsonRpc2_0Web3j(LocalWeb3jAccount.getOnlineServicesHttpService(Network.MAINNET));
+    }
+
+    static Web3j build(Network network) throws Exception {
+        return new JsonRpc2_0Web3j(LocalWeb3jAccount.getOnlineServicesHttpService(network));
+    }
+
     /**
      * Construct a new Web3j instance.
      *

gradle.properties

@@ -1,2 +1,2 @@
 group=org.web3j
-version=4.6.0-SNAPSHOT
+version=4.6.0-SNAPSHOT

integration-tests/src/test/java/org/web3j/protocol/CloudIT.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 Web3 Labs Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package org.web3j.protocol;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+import org.web3j.protocol.core.DefaultBlockParameter;
+
+public class CloudIT {
+
+    @Test
+    @Disabled(
+            "this will not work unless the machine test setup includes the CLI and has a logged-in user")
+    public void testWeb3jCloudIsFunctional() throws Exception {
+        Web3j web3j = Web3j.build();
+        String netVersion =
+                web3j.ethGetBlockByNumber(DefaultBlockParameter.valueOf("latest"), false)
+                        .send()
+                        .getBlock()
+                        .getHash();
+        System.out.println(netVersion);
+    }
+}