From 4305ecb0e7bca7f64324e0804df9543c4775aa6f Mon Sep 17 00:00:00 2001
From: chriseth <c@ethdev.com>
Date: Sat, 25 Feb 2017 00:11:26 +0100
Subject: [PATCH] Try reading multiple times from IPC.

---
 test/RPCSession.cpp | 39 +++++++++++++++++++++++++--------------
 test/RPCSession.h   | 10 ++++++++--
 2 files changed, 33 insertions(+), 16 deletions(-)

diff --git a/test/RPCSession.cpp b/test/RPCSession.cpp
index ff00d7833..57829ff5c 100644
--- a/test/RPCSession.cpp
+++ b/test/RPCSession.cpp
@@ -16,19 +16,20 @@
 
 	The Implementation originally from https://msdn.microsoft.com/en-us/library/windows/desktop/aa365592(v=vs.85).aspx
 */
-/** @file RPCSession.cpp
- * @author Dimtiry Khokhlov <dimitry@ethdev.com>
- * @author Alex Beregszaszi
- * @date 2016
- */
+/// @file RPCSession.cpp
+/// Low-level IPC communication between the test framework and the Ethereum node.
+
+#include "RPCSession.h"
+
+#include <libdevcore/CommonData.h>
+
+#include <json/reader.h>
+#include <json/writer.h>
 
 #include <string>
 #include <stdio.h>
 #include <thread>
-#include <libdevcore/CommonData.h>
-#include <json/reader.h>
-#include <json/writer.h>
-#include "RPCSession.h"
+#include <chrono>
 
 using namespace std;
 using namespace dev;
@@ -107,13 +108,23 @@ string IPCSocket::sendRequest(string const& _req)
 	return string(m_readBuf, m_readBuf + cbRead);
 #else
 	if (send(m_socket, _req.c_str(), _req.length(), 0) != (ssize_t)_req.length())
-		BOOST_FAIL("Writing on IPC failed");
+		BOOST_FAIL("Writing on IPC failed.");
 
-	ssize_t ret = recv(m_socket, m_readBuf, sizeof(m_readBuf), 0);
+	auto start = chrono::steady_clock::now();
+	ssize_t ret;
+	do
+	{
+		ret = recv(m_socket, m_readBuf, sizeof(m_readBuf), 0);
+		// Also consider closed socket an error.
+		if (ret < 0)
+			BOOST_FAIL("Reading on IPC failed.");
+	} while (
+		ret == 0 &&
+		chrono::duration_cast<chrono::milliseconds>(chrono::steady_clock::now() - start).count() < m_readTimeOutMS
+	);
 
-	// Also consider closed socket an error.
-	if (ret <= 0)
-		BOOST_FAIL("Reading on IPC failed");
+	if (ret == 0)
+		BOOST_FAIL("Timeout reading on IPC.");
 
 	return string(m_readBuf, m_readBuf + ret);
 #endif
diff --git a/test/RPCSession.h b/test/RPCSession.h
index 414db3232..843036e14 100644
--- a/test/RPCSession.h
+++ b/test/RPCSession.h
@@ -28,11 +28,13 @@
 #include <sys/un.h>
 #endif
 
+#include <json/value.h>
+
+#include <boost/test/unit_test.hpp>
+
 #include <string>
 #include <stdio.h>
 #include <map>
-#include <json/value.h>
-#include <boost/test/unit_test.hpp>
 
 #if defined(_WIN32)
 class IPCSocket : public boost::noncopyable
@@ -60,8 +62,12 @@ public:
 	std::string const& path() const { return m_path; }
 
 private:
+
 	std::string m_path;
 	int m_socket;
+	/// Socket read timeout in milliseconds. Needs to be large because the key generation routine
+	/// might take long.
+	unsigned static constexpr m_readTimeOutMS = 15000;
 	char m_readBuf[512000];
 };
 #endif