BSS Metrics API Server

This is an API Server implemented in Golang for receiving and processing BSS (BPF Scheduler Subsystem) metrics data and providing system information.

DEMO

Click the image below to see our DEMO on YouTube!

Features

Receive BSS metrics data sent by clients
Query pod-to-PID mappings from the system
Provide RESTful API in JSON format
Include health check endpoint
Support CORS
Request logging capability
Error handling and validation
Kubernetes integration for pod label information
Configurable scheduling strategies based on pod labels

API Endpoints

1. Submit Metrics Data

URL: /api/v1/metrics
Method: POST
Content-Type: application/json

Request Format

{
  "usersched_pid": 1234,
  "nr_queued": 10,
  "nr_scheduled": 5,
  "nr_running": 2,
  "nr_online_cpus": 8,
  "nr_user_dispatches": 100,
  "nr_kernel_dispatches": 50,
  "nr_cancel_dispatches": 2,
  "nr_bounce_dispatches": 1,
  "nr_failed_dispatches": 0,
  "nr_sched_congested": 3
}

Success Response

{
  "success": true,
  "message": "Metrics received successfully",
  "timestamp": "2025-06-19T10:30:00Z"
}

Error Response

{
  "success": false,
  "error": "Invalid JSON format: ..."
}

2. Get Pod-PID Mappings

URL: /api/v1/pods/pids
Method: GET

Response

{
  "success": true,
  "message": "Pod-PID mappings retrieved successfully",
  "timestamp": "2025-06-25T13:50:21Z",
  "pods": [
    {
      "pod_name": "",
      "namespace": "",
      "pod_uid": "65979e01-4cb1-4d08-9dba-45530253ff00",
      "container_id": "5148a146ffbbe8672f11494843d54b8769d2eccc677c02027fc09aba192e3c67",
      "processes": [
        {
          "pid": 717720,
          "command": "pause",
          "ppid": 717576
        },
        {
          "pid": 718001,
          "command": "loki",
          "ppid": 717576
        }
      ]
    }
  ]
}

Error Response

{
  "success": false,
  "error": "Failed to get pod-pid mappings: ..."
}

3. Get and Set Scheduling Strategies

URL: /api/v1/scheduling/strategies
Methods: GET, POST
Content-Type: application/json

GET Response

{
  "success": true,
  "message": "Scheduling strategies retrieved successfully",
  "timestamp": "2025-06-19T10:30:00Z",
  "scheduling": [
    {
      "priority": true,
      "execution_time": 20000000,
      "pid": 718001
    },
    {
      "priority": false,
      "execution_time": 10000000,
      "pid": 717720
    }
  ]
}

POST Request Format

{
  "strategies": [
    {
      "priority": true,
      "execution_time": 20000000,
      "selectors": [
        {
          "key": "nf",
          "value": "upf"
        }
      ]
    },
    {
      "priority": false,
      "execution_time": 10000000,
      "pid": 717720
    }
  ]
}

POST Success Response

{
  "success": true,
  "message": "Scheduling strategies saved successfully",
  "timestamp": "2025-06-19T10:30:00Z"
}

4. Health Check

URL: /health
Method: GET

Response

{
  "status": "healthy",
  "timestamp": "2025-06-19T10:30:00Z",
  "service": "BSS Metrics API Server"
}

5. API Information

URL: /
Method: GET

Quick Start

1. Install Dependencies

go mod tidy

2. Start Service

go run main.go

The service will start on http://localhost:8080.

3. Start Service with Kubernetes integration

# Use local Kubernetes config
go run main.go --kubeconfig=$HOME/.kube/config

# Run in-cluster (when deployed in Kubernetes)
go run main.go --in-cluster=true

4. Test API

Submit metrics data

curl -X POST http://localhost:8080/api/v1/metrics \
  -H "Content-Type: application/json" \
  -d '{
    "usersched_pid": 1234,
    "nr_queued": 10,
    "nr_scheduled": 5,
    "nr_running": 2,
    "nr_online_cpus": 8,
    "nr_user_dispatches": 100,
    "nr_kernel_dispatches": 50,
    "nr_cancel_dispatches": 2,
    "nr_bounce_dispatches": 1,
    "nr_failed_dispatches": 0,
    "nr_sched_congested": 3
  }'

Check health status

curl http://localhost:8080/health

Query Pod-PID Mappings

# Get all pod-pid mappings
curl -X GET http://localhost:8080/api/v1/pods/pids

# Format output with jq for better readability
curl -s -X GET http://localhost:8080/api/v1/pods/pids | jq '.'

# Get only specific information (example: extract pod UIDs and process counts)
curl -s -X GET http://localhost:8080/api/v1/pods/pids | jq '.pods[] | {pod_uid: .pod_uid, process_count: (.processes | length)}'

Get scheduling strategies

curl -X GET http://localhost:8080/api/v1/scheduling/strategies

Set scheduling strategies

curl -X POST http://localhost:8080/api/v1/scheduling/strategies \
  -H "Content-Type: application/json" \
  -d '{
    "strategies": [
      {
        "priority": true,
        "execution_time": 20000000,
        "selectors": [
          {
            "key": "nf",
            "value": "upf"
          }
        ]
      },
      {
        "priority": false,
        "execution_time": 10000000,
        "pid": 717720
      }
    ]
  }'

Data Structure Description

BssData Structure

Field	Type	Description
`usersched_pid`	uint32	PID of the userspace scheduler
`nr_queued`	uint64	Number of tasks queued in the userspace scheduler
`nr_scheduled`	uint64	Number of tasks scheduled by the userspace scheduler
`nr_running`	uint64	Number of tasks currently running in the userspace scheduler
`nr_online_cpus`	uint64	Number of online CPUs in the system
`nr_user_dispatches`	uint64	Number of userspace dispatches
`nr_kernel_dispatches`	uint64	Number of kernel space dispatches
`nr_cancel_dispatches`	uint64	Number of cancelled dispatches
`nr_bounce_dispatches`	uint64	Number of bounce dispatches
`nr_failed_dispatches`	uint64	Number of failed dispatches
`nr_sched_congested`	uint64	Number of scheduler congestion occurrences

PodInfo Structure

Field	Type	Description
`pod_name`	string	Name of the pod (currently empty, extracted from metadata)
`namespace`	string	Namespace of the pod (currently empty, extracted from metadata)
`pod_uid`	string	Unique identifier of the pod
`container_id`	string	Container ID within the pod
`processes`	[]PodProcess	List of processes running in the pod

PodProcess Structure

Field	Type	Description
`pid`	int	Process ID
`command`	string	Command name of the process
`ppid`	int	Parent Process ID (optional)

SchedulingStrategy Structure

Field	Type	Description
`priority`	bool	Indicates if this is a high-priority strategy
`execution_time`	uint64	Desired execution time in nanoseconds
`pid`	uint32	Optional specific PID to apply this strategy
`selectors`	[]LabelSelector	Optional selectors to match pods for this strategy

LabelSelector Structure

Field	Type	Description
`key`	string	Label key to match
`value`	string	Expected value of the label

Development and Extension

Suggested New Features

Data Persistence: Store received metrics to database (such as PostgreSQL, MongoDB)
Data Analytics: Add statistical and analytical features
Alert System: Set up alert rules based on metrics values
Authentication & Authorization: Add API key or JWT authentication
Batch Processing: Support batch submission of multiple metrics data
Monitoring Dashboard: Build web interface to visualize metrics data

Architecture Description

Uses Gorilla Mux for routing
Includes middleware for CORS and logging
Structured error handling and response format
Timestamps use RFC3339 format
Kubernetes client integration with caching
Support for both in-cluster and out-of-cluster operation

Kubernetes 整合

此 API 伺服器可以與 Kubernetes 整合，以獲取真實的 Pod 標籤資訊。它支援兩種運行模式：

在 Kubernetes 集群內運行

當在 Kubernetes 集群內部署時，API 伺服器會自動使用 ServiceAccount 連接到 Kubernetes API。完整的部署清單可在 k8s/deployment.yaml 中找到，其中包含：

具備必要權限的 ServiceAccount
具有健康檢查的 Deployment
用於公開 API 的 Service

部署命令：

kubectl apply -f k8s/deployment.yaml

在集群外運行

當在 Kubernetes 集群外運行時，API 伺服器會嘗試使用 kubeconfig 文件連接到 Kubernetes API。預設情況下，它會使用 ~/.kube/config 路徑，您也可以通過設置 KUBECONFIG 環境變數或使用 --kubeconfig 參數來指定不同的路徑：

export KUBECONFIG=/path/to/your/kubeconfig
go run main.go

# 或者
go run main.go --kubeconfig=/path/to/your/kubeconfig

實時 Pod 標籤更新

API 伺服器會定期刷新其 Pod 標籤緩存，以確保即使在 Pod 標籤變更時，調度策略也能正確應用。

降級到模擬數據

如果無法連接到 Kubernetes API，系統會自動降級使用模擬數據。這對於開發和測試環境很有用。

Docker 映像建立

要建立 Docker 映像：

docker build -t bss-metrics-api:latest .

License

This project is open source.

Name		Name	Last commit message	Last commit date
Latest commit History 12 Commits
.github		.github
config		config
k8s		k8s
static		static
.gitignore		.gitignore
Dockerfile		Dockerfile
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
config.go		config.go
go.mod		go.mod
go.sum		go.sum
kubernetes.go		kubernetes.go
main.go		main.go
notice.txt		notice.txt
options.go		options.go

License

Gthulhu/api

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BSS Metrics API Server

DEMO

Features

API Endpoints

1. Submit Metrics Data

Request Format

Success Response

Error Response

2. Get Pod-PID Mappings

Response

Error Response

3. Get and Set Scheduling Strategies

GET Response

POST Request Format

POST Success Response

4. Health Check

Response

5. API Information

Quick Start

1. Install Dependencies

2. Start Service

3. Start Service with Kubernetes integration

4. Test API

Submit metrics data

Check health status

Query Pod-PID Mappings

Get scheduling strategies

Set scheduling strategies

Data Structure Description

BssData Structure

PodInfo Structure

PodProcess Structure

SchedulingStrategy Structure

LabelSelector Structure

Development and Extension

Suggested New Features

Architecture Description

Kubernetes 整合

在 Kubernetes 集群內運行

在集群外運行

實時 Pod 標籤更新

降級到模擬數據

Docker 映像建立

License

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