consul package and basic client added (#716)

* this adds a consul package which can be used to fetch a consul binary
* it also adds a `ConsulProcess` helper which can be used to spawn and manage a consul service instance
* zencore dependencies brought across:
   - `except_fmt.h` for easer generation of formatted exception messages
   - `process.h/cpp` changes (adds `Kill` operation and process group support on Windows)
   - `string.h` changes to allow generic use of `WideToUtf8()`

1 files changed, 47 insertions, 0 deletions

diff --git a/src/zenutil/include/zenutil/consul.h b/src/zenutil/include/zenutil/consul.h
new file mode 100644
index 000000000..08871fa66
--- /dev/null
+++ b/src/zenutil/include/zenutil/consul.h
@@ -0,0 +1,47 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include <zenbase/zenbase.h>
+#include <zenhttp/httpclient.h>
+
+#include <string>
+#include <string_view>
+
+namespace zen::consul {
+
+class ConsulClient
+{
+public:
+	ConsulClient(std::string_view BaseUri);
+	~ConsulClient();
+
+	ConsulClient(const ConsulClient&) = delete;
+	ConsulClient& operator=(const ConsulClient&) = delete;
+
+	void		SetKeyValue(std::string_view Key, std::string_view Value);
+	std::string GetKeyValue(std::string_view Key);
+	void		DeleteKey(std::string_view Key);
+
+private:
+	HttpClient m_HttpClient;
+};
+
+class ConsulProcess
+{
+public:
+	ConsulProcess();
+	~ConsulProcess();
+
+	ConsulProcess(const ConsulProcess&) = delete;
+	ConsulProcess& operator=(const ConsulProcess&) = delete;
+
+	void SpawnConsulAgent();
+	void StopConsulAgent();
+
+private:
+	struct Impl;
+	std::unique_ptr<Impl> m_Impl;
+};
+
+}  // namespace zen::consul