1 files changed, 366 insertions, 0 deletions
diff --git a/src/zennomad/nomadclient.cpp b/src/zennomad/nomadclient.cpp
new file mode 100644
index 000000000..9edcde125
--- /dev/null
+++ b/src/zennomad/nomadclient.cpp
@@ -0,0 +1,366 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zencore/fmtutils.h>
+#include <zencore/iobuffer.h>
+#include <zencore/logging.h>
+#include <zencore/memoryview.h>
+#include <zencore/trace.h>
+#include <zenhttp/httpclient.h>
+#include <zennomad/nomadclient.h>
+
+ZEN_THIRD_PARTY_INCLUDES_START
+#include <json11.hpp>
+ZEN_THIRD_PARTY_INCLUDES_END
+
+namespace zen::nomad {
+
+namespace {
+
+	HttpClient::KeyValueMap MakeNomadHeaders(const NomadConfig& Config)
+	{
+		HttpClient::KeyValueMap Headers;
+		if (!Config.AclToken.empty())
+		{
+			Headers->emplace("X-Nomad-Token", Config.AclToken);
+		}
+		return Headers;
+	}
+
+}  // namespace
+
+NomadClient::NomadClient(const NomadConfig& Config) : m_Config(Config), m_Log(zen::logging::Get("nomad.client"))
+{
+}
+
+NomadClient::~NomadClient() = default;
+
+bool
+NomadClient::Initialize()
+{
+	ZEN_TRACE_CPU("NomadClient::Initialize");
+
+	HttpClientSettings Settings;
+	Settings.LogCategory	= "nomad.http";
+	Settings.ConnectTimeout = std::chrono::milliseconds{10000};
+	Settings.Timeout		= std::chrono::milliseconds{60000};
+	Settings.RetryCount		= 1;
+
+	// Ensure the base URL ends with a slash so path concatenation works correctly
+	std::string BaseUrl = m_Config.ServerUrl;
+	if (!BaseUrl.empty() && BaseUrl.back() != '/')
+	{
+		BaseUrl += '/';
+	}
+
+	m_Http = std::make_unique<zen::HttpClient>(BaseUrl, Settings);
+
+	return true;
+}
+
+std::string
+NomadClient::BuildJobJson(const std::string& JobId, const std::string& OrchestratorEndpoint) const
+{
+	ZEN_TRACE_CPU("NomadClient::BuildJobJson");
+
+	// Build the task config based on driver and distribution mode
+	json11::Json::object TaskConfig;
+
+	if (m_Config.TaskDriver == Driver::RawExec)
+	{
+		std::string Command;
+		if (m_Config.BinDistribution == BinaryDistribution::PreDeployed)
+		{
+			Command = m_Config.BinaryPath;
+		}
+		else
+		{
+			// Artifact mode: binary is downloaded to local/zenserver
+			Command = "local/zenserver";
+		}
+
+		TaskConfig["command"] = Command;
+
+		json11::Json::array Args;
+		Args.push_back("compute");
+		Args.push_back("--http=asio");
+		if (!OrchestratorEndpoint.empty())
+		{
+			ExtendableStringBuilder<256> CoordArg;
+			CoordArg << "--coordinator-endpoint=" << OrchestratorEndpoint;
+			Args.push_back(std::string(CoordArg.ToView()));
+		}
+		{
+			ExtendableStringBuilder<128> IdArg;
+			IdArg << "--instance-id=nomad-" << JobId;
+			Args.push_back(std::string(IdArg.ToView()));
+		}
+		TaskConfig["args"] = Args;
+	}
+	else
+	{
+		// Docker driver
+		TaskConfig["image"] = m_Config.DockerImage;
+
+		json11::Json::array Args;
+		Args.push_back("compute");
+		Args.push_back("--http=asio");
+		if (!OrchestratorEndpoint.empty())
+		{
+			ExtendableStringBuilder<256> CoordArg;
+			CoordArg << "--coordinator-endpoint=" << OrchestratorEndpoint;
+			Args.push_back(std::string(CoordArg.ToView()));
+		}
+		{
+			ExtendableStringBuilder<128> IdArg;
+			IdArg << "--instance-id=nomad-" << JobId;
+			Args.push_back(std::string(IdArg.ToView()));
+		}
+		TaskConfig["args"] = Args;
+	}
+
+	// Build resource stanza
+	json11::Json::object Resources;
+	Resources["CPU"]	  = m_Config.CpuMhz;
+	Resources["MemoryMB"] = m_Config.MemoryMb;
+
+	// Build the task
+	json11::Json::object Task;
+	Task["Name"]	  = "zenserver";
+	Task["Driver"]	  = (m_Config.TaskDriver == Driver::RawExec) ? "raw_exec" : "docker";
+	Task["Config"]	  = TaskConfig;
+	Task["Resources"] = Resources;
+
+	// Add artifact stanza if using artifact distribution
+	if (m_Config.BinDistribution == BinaryDistribution::Artifact && !m_Config.ArtifactSource.empty())
+	{
+		json11::Json::object Artifact;
+		Artifact["GetterSource"] = m_Config.ArtifactSource;
+
+		json11::Json::array Artifacts;
+		Artifacts.push_back(Artifact);
+		Task["Artifacts"] = Artifacts;
+	}
+
+	json11::Json::array Tasks;
+	Tasks.push_back(Task);
+
+	// Build the task group
+	json11::Json::object Group;
+	Group["Name"]  = "zenserver-group";
+	Group["Count"] = 1;
+	Group["Tasks"] = Tasks;
+
+	json11::Json::array Groups;
+	Groups.push_back(Group);
+
+	// Build datacenters array
+	json11::Json::array Datacenters;
+	Datacenters.push_back(m_Config.Datacenter);
+
+	// Build the job
+	json11::Json::object Job;
+	Job["ID"]		   = JobId;
+	Job["Name"]		   = JobId;
+	Job["Type"]		   = "batch";
+	Job["Datacenters"] = Datacenters;
+	Job["TaskGroups"]  = Groups;
+
+	if (!m_Config.Namespace.empty() && m_Config.Namespace != "default")
+	{
+		Job["Namespace"] = m_Config.Namespace;
+	}
+
+	if (!m_Config.Region.empty())
+	{
+		Job["Region"] = m_Config.Region;
+	}
+
+	// Wrap in the registration envelope
+	json11::Json::object Root;
+	Root["Job"] = Job;
+
+	return json11::Json(Root).dump();
+}
+
+bool
+NomadClient::SubmitJob(const std::string& JobJson, NomadJobInfo& OutJob)
+{
+	ZEN_TRACE_CPU("NomadClient::SubmitJob");
+
+	const IoBuffer Payload = IoBufferBuilder::MakeFromMemory(MemoryView{JobJson.data(), JobJson.size()}, ZenContentType::kJSON);
+
+	const HttpClient::Response Response = m_Http->Put("v1/jobs", Payload, MakeNomadHeaders(m_Config));
+
+	if (Response.Error)
+	{
+		ZEN_WARN("Nomad job submit failed: {}", Response.Error->ErrorMessage);
+		return false;
+	}
+
+	const int StatusCode = static_cast<int>(Response.StatusCode);
+
+	if (!Response.IsSuccess())
+	{
+		ZEN_WARN("Nomad job submit failed with HTTP/{}", StatusCode);
+		return false;
+	}
+
+	const std::string  Body(Response.AsText());
+	std::string		   Err;
+	const json11::Json Json = json11::Json::parse(Body, Err);
+
+	if (!Err.empty())
+	{
+		ZEN_WARN("invalid JSON response from Nomad job submit: {}", Err);
+		return false;
+	}
+
+	// The response contains EvalID; the job ID is what we submitted
+	OutJob.Id	  = Json["JobModifyIndex"].is_number() ? OutJob.Id : "";
+	OutJob.Status = "pending";
+
+	ZEN_INFO("Nomad job submitted: eval_id={}", Json["EvalID"].string_value());
+
+	return true;
+}
+
+bool
+NomadClient::GetJobStatus(const std::string& JobId, NomadJobInfo& OutJob)
+{
+	ZEN_TRACE_CPU("NomadClient::GetJobStatus");
+
+	ExtendableStringBuilder<128> Path;
+	Path << "v1/job/" << JobId;
+
+	const HttpClient::Response Response = m_Http->Get(Path.ToView(), MakeNomadHeaders(m_Config));
+
+	if (Response.Error)
+	{
+		ZEN_WARN("Nomad job status query failed for '{}': {}", JobId, Response.Error->ErrorMessage);
+		return false;
+	}
+
+	const int StatusCode = static_cast<int>(Response.StatusCode);
+
+	if (StatusCode == 404)
+	{
+		ZEN_INFO("Nomad job '{}' not found", JobId);
+		OutJob.Status = "dead";
+		return true;
+	}
+
+	if (!Response.IsSuccess())
+	{
+		ZEN_WARN("Nomad job status query failed with HTTP/{}", StatusCode);
+		return false;
+	}
+
+	const std::string  Body(Response.AsText());
+	std::string		   Err;
+	const json11::Json Json = json11::Json::parse(Body, Err);
+
+	if (!Err.empty())
+	{
+		ZEN_WARN("invalid JSON in Nomad job status response: {}", Err);
+		return false;
+	}
+
+	OutJob.Id	  = Json["ID"].string_value();
+	OutJob.Status = Json["Status"].string_value();
+	if (const json11::Json Desc = Json["StatusDescription"]; Desc.is_string())
+	{
+		OutJob.StatusDescription = Desc.string_value();
+	}
+
+	return true;
+}
+
+bool
+NomadClient::GetAllocations(const std::string& JobId, std::vector<NomadAllocInfo>& OutAllocs)
+{
+	ZEN_TRACE_CPU("NomadClient::GetAllocations");
+
+	ExtendableStringBuilder<128> Path;
+	Path << "v1/job/" << JobId << "/allocations";
+
+	const HttpClient::Response Response = m_Http->Get(Path.ToView(), MakeNomadHeaders(m_Config));
+
+	if (Response.Error)
+	{
+		ZEN_WARN("Nomad allocation query failed for '{}': {}", JobId, Response.Error->ErrorMessage);
+		return false;
+	}
+
+	if (!Response.IsSuccess())
+	{
+		ZEN_WARN("Nomad allocation query failed with HTTP/{}", static_cast<int>(Response.StatusCode));
+		return false;
+	}
+
+	const std::string  Body(Response.AsText());
+	std::string		   Err;
+	const json11::Json Json = json11::Json::parse(Body, Err);
+
+	if (!Err.empty())
+	{
+		ZEN_WARN("invalid JSON in Nomad allocation response: {}", Err);
+		return false;
+	}
+
+	OutAllocs.clear();
+	if (!Json.is_array())
+	{
+		return true;
+	}
+
+	for (const json11::Json& AllocVal : Json.array_items())
+	{
+		NomadAllocInfo Alloc;
+		Alloc.Id		   = AllocVal["ID"].string_value();
+		Alloc.ClientStatus = AllocVal["ClientStatus"].string_value();
+
+		// Extract task state if available
+		if (const json11::Json TaskStates = AllocVal["TaskStates"]; TaskStates.is_object())
+		{
+			for (const auto& [TaskName, TaskState] : TaskStates.object_items())
+			{
+				if (TaskState["State"].is_string())
+				{
+					Alloc.TaskState = TaskState["State"].string_value();
+				}
+			}
+		}
+
+		OutAllocs.push_back(std::move(Alloc));
+	}
+
+	return true;
+}
+
+bool
+NomadClient::StopJob(const std::string& JobId)
+{
+	ZEN_TRACE_CPU("NomadClient::StopJob");
+
+	ExtendableStringBuilder<128> Path;
+	Path << "v1/job/" << JobId;
+
+	const HttpClient::Response Response = m_Http->Delete(Path.ToView(), MakeNomadHeaders(m_Config));
+
+	if (Response.Error)
+	{
+		ZEN_WARN("Nomad job stop failed for '{}': {}", JobId, Response.Error->ErrorMessage);
+		return false;
+	}
+
+	if (!Response.IsSuccess())
+	{
+		ZEN_WARN("Nomad job stop failed with HTTP/{}", static_cast<int>(Response.StatusCode));
+		return false;
+	}
+
+	ZEN_INFO("Nomad job '{}' stopped", JobId);
+	return true;
+}
+
+}  // namespace zen::nomad