From cf1c01acea2d93606014408b10d017449eb41e6b Mon Sep 17 00:00:00 2001
From: Braydon Fuller <braydon@bitpay.com>
Date: Tue, 15 Sep 2015 16:58:30 -0400
Subject: [PATCH] Bindings: Send transaction emit "tx" events.

---
 integration/regtest.js | 18 ++++++++++++++++++
 src/libbitcoind.cc     | 28 ++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/integration/regtest.js b/integration/regtest.js
index bf5c7ac5..c43e0b76 100644
--- a/integration/regtest.js
+++ b/integration/regtest.js
@@ -286,6 +286,24 @@ describe('Daemon Binding Functionality', function() {
       }).should.throw('\x10: mandatory-script-verify-flag-failed (Operation not valid with the current stack size)');
     });
 
+    it('will emit "tx" events', function(done) {
+      var tx = bitcore.Transaction();
+      tx.from(utxos[2]);
+      tx.change(privateKey.toAddress());
+      tx.to(destKey.toAddress(), utxos[2].amount * 1e8 - 1000);
+      tx.sign(bitcore.PrivateKey.fromWIF(utxos[2].privateKeyWIF));
+
+      var serialized = tx.serialize();
+
+      bitcoind.on('tx', function(result) {
+        result.buffer.toString('hex').should.equal(serialized);
+        result.hash.should.equal(tx.hash);
+        result.mempool.should.equal(true);
+        done();
+      });
+      bitcoind.sendTransaction(serialized);
+    });
+
   });
 
   describe('fee estimation', function() {
diff --git a/src/libbitcoind.cc b/src/libbitcoind.cc
index 0c3b8758..d3840963 100644
--- a/src/libbitcoind.cc
+++ b/src/libbitcoind.cc
@@ -96,6 +96,7 @@ init(Handle<Object>);
 static std::vector<CDataStream> txmon_messages;
 static uv_async_t txmon_async;
 static Eternal<Function> txmon_callback;
+static bool txmon_callback_available;
 
 static volatile bool shutdown_complete = false;
 static char *g_data_dir = NULL;
@@ -219,6 +220,7 @@ NAN_METHOD(StartTxMon) {
   Local<Function> callback = Local<Function>::Cast(args[0]);
   Eternal<Function> cb(isolate, callback);
   txmon_callback = cb;
+  txmon_callback_available = true;
 
   CNodeSignals& nodeSignals = GetNodeSignals();
   nodeSignals.ProcessMessages.connect(&scan_messages, boost::signals2::at_front);
@@ -1493,6 +1495,32 @@ NAN_METHOD(SendTransaction) {
   // Relay the transaction connect peers
   RelayTransaction(tx);
 
+  // Notify any listeners about the transaction
+  if(txmon_callback_available) {
+
+    Local<Array> results = Array::New(isolate);
+    Local<Object> obj = NanNew<Object>();
+
+    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    ssTx << tx;
+    std::string stx = ssTx.str();
+    Local<Value> txBuffer = node::Buffer::New(isolate, stx.c_str(), stx.size());
+
+    obj->Set(NanNew<String>("buffer"), txBuffer);
+    obj->Set(NanNew<String>("hash"), NanNew<String>(hashTx.GetHex()));
+    obj->Set(NanNew<String>("mempool"), NanNew<Boolean>(true));
+
+    results->Set(0, obj);
+
+    const unsigned argc = 1;
+    Local<Value> argv[argc] = {
+      Local<Value>::New(isolate, results)
+    };
+    Local<Function> cb = txmon_callback.Get(isolate);
+
+    cb->Call(isolate->GetCurrentContext()->Global(), argc, argv);
+  }
+
   NanReturnValue(Local<Value>::New(isolate, NanNew<String>(hashTx.GetHex())));
 }