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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service
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/*
* Copyright (c) [2016] [ ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see watchers = new HashMap<>();
ScheduledExecutorService poller = Executors.newSingleThreadScheduledExecutor();
public JsonRpcWhisper(URL rpcUrl) {
this.rpcUrl = rpcUrl;
poller.scheduleAtFixedRate(() -> {
try {
pollFilters();
} catch (Exception e) {
logger.error("Unhandled exception", e);
}
}, 1, 1, TimeUnit.SECONDS);
}
@Override
public String addIdentity(ECKey key) {
throw new RuntimeException("Not supported by public JSON RPC API");
}
@Override
public String newIdentity() {
SimpleResponse resp = sendJson(new JsonRpcRequest("shh_newIdentity", null), SimpleResponse.class);
return del0X(resp.result);
}
@Override
public void watch(MessageWatcher f) {
String[] topics = f.getTopics().length == 0 ? null : new String[f.getTopics().length];
for (int i = 0; i < f.getTopics().length; i++) {
topics[i] = f.getTopics()[i].getOriginalTopic();
}
FilterParams params = new FilterParams(add0X(f.getTo()), topics);
SimpleResponse resp = sendJson(new JsonRpcRequest("shh_newFilter", params), SimpleResponse.class);
int filterId = Integer.parseInt(del0X(resp.result), 16);
watchers.put(filterId, f);
}
@Override
public void unwatch(MessageWatcher f) {
int filterId = -1;
for (Map.Entry entry : watchers.entrySet()) {
if (entry.getValue() == f) {
filterId = entry.getKey();
break;
}
}
if (filterId == -1) return;
sendJson(new JsonRpcRequest("shh_uninstallFilter",
add0X(Integer.toHexString(filterId))), SimpleResponse.class);
}
private String fromAddress(String s) {
if (s == null) return null;
s = del0X(s);
BigInteger i = new BigInteger(s, 16);
if (i.bitCount() > 0) {
return s;
}
return null;
}
private void pollFilters() {
for (Map.Entry entry : watchers.entrySet()) {
MessagesResponse ret = sendJson(new JsonRpcRequest("shh_getFilterChanges",
add0X(Integer.toHexString(entry.getKey()))), MessagesResponse.class);
for (MessageParams msg : ret.result) {
Topic[] topics = msg.topics == null ? null : new Topic[msg.topics.length];
for (int i = 0; topics != null && i < topics.length; i++) {
topics[i] = new Topic(Hex.decode(del0X(msg.topics[i])));
}
WhisperMessage m = new WhisperMessage()
.setPayload(decodeString(msg.payload))
.setFrom(fromAddress(msg.from))
.setTo(fromAddress(msg.to))
.setTopics(topics);
entry.getValue().newMessage(m);
}
}
}
@Override
public void send(String from, String to, byte[] payload, Topic[] topics, int ttl, int workToProve) {
String[] topicsS = new String[topics.length];
for (int i = 0; i < topics.length; i++) {
topicsS[i] = topics[i].getOriginalTopic();
}
SimpleResponse res = sendJson(new JsonRpcRequest("shh_post",
new MessageParams(new String(payload), add0X(to), add0X(from),
topicsS, ttl, workToProve)), SimpleResponse.class);
if (!"true".equals(res.result)) {
throw new RuntimeException("Shh post failed: " + res);
}
}
private RespType sendJson(JsonRpcRequest req, Class respClazz) {
String out = null, in = null;
try {
ObjectMapper om = new ObjectMapper();
out = om.writeValueAsString(req);
logger.debug("JSON RPC Outbound: " + out);
in = sendPost(out);
logger.debug("JSON RPC Inbound: " + in);
RespType resp = om.readValue(in, respClazz);
resp.throwIfError();
return resp;
} catch (IOException e) {
throw new RuntimeException("Error processing JSON (Sent: " + out + ", Received: " + in + ")", e);
}
}
private String sendPost(String urlParams) {
try {
HttpURLConnection con = (HttpURLConnection) rpcUrl.openConnection();
//add reuqest header
con.setRequestMethod("POST");
// Send post request
con.setDoOutput(true);
try (DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
wr.writeBytes(urlParams);
wr.flush();
}
int responseCode = con.getResponseCode();
if (responseCode != 200) {
throw new RuntimeException("HTTP Response: " + responseCode);
}
final StringBuffer response;
try (BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()))) {
String inputLine;
response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
}
return response.toString();
} catch (IOException e) {
throw new RuntimeException("Error sending POST to " + rpcUrl, e);
}
}
static String add0X(String s) {
if (s == null) return null;
return s.startsWith("0x") ? s : "0x" + s;
}
static String del0X(String s) {
if (s == null) return null;
return s.startsWith("0x") ? s.substring(2) : s;
}
static String encodeString(String s) {
return s == null ? null : "0x" + Hex.toHexString(s.getBytes());
}
static String decodeString(String s) {
if (s.startsWith("0x")) s = s.substring(2);
return new String(Hex.decode(s));
}
@JsonInclude(JsonInclude.Include.NON_NULL)
public static class JsonRpcRequest {
private static AtomicInteger idCount = new AtomicInteger(0);
public final String jsonrpc = "2.0";
public int id = idCount.incrementAndGet();
public String method;
public List params;
public JsonRpcRequest(String method, ParamT params) {
this.method = method;
this.params = params == null ? null : Collections.singletonList(params);
}
}
@JsonInclude(JsonInclude.Include.NON_NULL)
public static class MessageParams {
public String payload;
public String to;
public String from;
public String[] topics;
public String ttl = "0x60";
public Integer priority;
// response fields
public String hash;
public String expiry;
public String sent;
public String workProved;
public MessageParams() {
}
public MessageParams(String payload, String to, String from, String[] topics, Integer ttl, Integer priority) {
this.payload = encodeString(payload);
this.to = to;
this.from = from;
this.topics = topics;
for (int i = 0; i < this.topics.length; i++) {
this.topics[i] = encodeString(this.topics[i]);
}
this.ttl = "0x" + Integer.toHexString(ttl);
this.priority = priority;
}
}
@JsonInclude(JsonInclude.Include.NON_NULL)
public static class FilterParams {
public String to;
public String[] topics;
public FilterParams(String to, String[] topics) {
this.to = to;
this.topics = topics;
for (int i = 0; topics != null && i < this.topics.length; i++) {
this.topics[i] = encodeString(this.topics[i]);
}
}
}
public static class JsonRpcResponse {
public static class Error {
public int code;
public String message;
}
public int id;
public String jsonrpc;
public Error error;
public void throwIfError() {
if (error != null) {
throw new RuntimeException("JSON RPC returned error (" + error.code + "): " + error.message);
}
}
}
public static class SimpleResponse extends JsonRpcResponse {
public String result;
@Override
public String toString() {
return "JsonRpcResponse{" +
"id=" + id +
", jsonrpc='" + jsonrpc + '\'' +
", result='" + result + '\'' +
'}';
}
}
public static class MessagesResponse extends JsonRpcResponse {
public List result;
@Override
public String toString() {
return "MessagesResponse{" +
"id=" + id +
", jsonrpc='" + jsonrpc + '\'' +
"result=" + result +
'}';
}
}
public static void main(String[] args) throws Exception {
String json = "{\"jsonrpc\":\"2.0\",\n" +
" \n" +
" \"method\":\"shh_newIdentity\",\n" +
" \"params\": [{ \"payload\": \"Hello\", \"ttl\": \"100\", \"to\" : \"0xbd27a63c91fe3233c5777e6d3d7b39204d398c8f92655947eb5a373d46e1688f022a1632d264725cbc7dc43ee1cfebde42fa0a86d08b55d2acfbb5e9b3b48dc5\", \"from\": \"id1\" }],\n" +
" \"id\":1001\n" +
"}";
JsonRpcWhisper rpcWhisper = new JsonRpcWhisper(new URL("http://localhost:8545"));
// JsonRpcResponse resp = rpcWhisper.sendJson(new JsonRpcRequest("shh_post",
// new PostParams("Hello").to("0xbd27a63c91fe3233c5777e6d3d7b39204d398c8f92655947eb5a373d46e1688f022a1632d264725cbc7dc43ee1cfebde42fa0a86d08b55d2acfbb5e9b3b48dc5")));
// Hex.decode("7d04a8170c432240dcf544e27610cc3a10a32c6a5f8ff8cf5a06d26ee0d37da4075701ff03cee88d50885ff56bcd9a5070ff98b9a3045d6ff32e0f1821c21f87")
rpcWhisper.send(null, null, "Hello C++ Whisper".getBytes(), Topic.createTopics("ATopic"), 60, 1);
rpcWhisper.watch(new MessageWatcher(null,
null, Topic.createTopics("ATopic")) {
@Override
protected void newMessage(WhisperMessage msg) {
System.out.println("JsonRpcWhisper.newMessage:" + "msg = [" + msg + "]");
}
});
Thread.sleep(1000000000);
// String resp = rpcWhisper.sendPost(json);
// System.out.println("Resp: " + resp);
}
}