[clang] [llvm] [clang][MBD] set up module build daemon infrastructure (PR #67562)

[Michael Spencer via cfe-commits]

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@@ -0,0 +1,60 @@
+//===------------------------ SocketMsgSupport.cpp ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/raw_socket_stream.h"
+
+#include <memory>
+#include <string>
+
+using namespace llvm;
+
+namespace clang::tooling::cc1modbuildd {
+
+Expected<std::unique_ptr<raw_socket_stream>>
+connectToSocket(StringRef SocketPath) {
+
+  Expected<std::unique_ptr<raw_socket_stream>> MaybeClient =
+      raw_socket_stream::createConnectedUnix(SocketPath);
+  if (!MaybeClient)
+    return std::move(MaybeClient.takeError());
+
+  return std::move(*MaybeClient);
+}
+
+Expected<std::string> readBufferFromSocket(raw_socket_stream &Socket) {
+
+  constexpr const unsigned short MAX_BUFFER = 4096;
+  char Buffer[MAX_BUFFER];
+  std::string ReturnBuffer;
+
+  ssize_t n = 0;
+  while ((n = Socket.read(Buffer, MAX_BUFFER)) > 0) {
+    ReturnBuffer.append(Buffer, n);
+    // Read until \n... encountered which is the last line of a YAML document
+    if (ReturnBuffer.find("\n...") != std::string::npos)
----------------
Bigcheese wrote:

The `\n...` could be anywhere in the buffer if multiple messages are sent.

https://github.com/llvm/llvm-project/pull/67562