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AWS CDK constructs library for OpenAB

Project description

cdk-openab

AWS CDK constructs library for deploying OpenAB aka Agent Broker on AWS ECS Fargate.

Architecture
┌───────────────────────────────────────────────────────────────────┐
│  AWS Cloud                                                        │
│                                                                   │
│  ┌─────────────────────────────────────────────────────────────┐  │
│  │  VPC (default: 10.168.0.0/16)                               │  │
│  │                                                             │  │
│  │  ┌───────────────────────────────────────────────────────┐  │  │
│  │  │  Public Subnet                                        │  │  │
│  │  │                                                       │  │  │
│  │  │  ┌─────────────────────────────────────────────────┐  │  │  │
│  │  │  │  ECS Cluster                                    │  │  │  │
│  │  │  │                                                 │  │  │  │
│  │  │  │  ┌───────────────────────────────────────────┐  │  │  │  │
│  │  │  │  │  Fargate Service (FARGATE_SPOT | FARGATE) │  │  │  │  │
│  │  │  │  │                                           │  │  │  │  │
│  │  │  │  │  ┌───────────┐  ┌──────────────────────┐  │  │  │  │  │
│  │  │  │  │  │ data-init │─▶│  app container       │  │  │  │  │  │
│  │  │  │  │  │ (S3 pull) │  │  (port 80)           │  │  │  │  │  │
│  │  │  │  │  └───────────┘  └──────────┬───────────┘  │  │  │  │  │
│  │  │  │  │                            │ stops        │  │  │  │  │
│  │  │  │  │                            ▼              │  │  │  │  │
│  │  │  │  │                 ┌───────────────────────┐  │  │  │  │  │
│  │  │  │  │                 │ data-backup (sidecar) │  │  │  │  │  │
│  │  │  │  │                 │ S3 sync on app stop   │  │  │  │  │  │
│  │  │  │  │                 └───────────────────────┘  │  │  │  │  │
│  │  │  │  └───────────────────────────────────────────┘  │  │  │  │
│  │  │  └─────────────────────────────────────────────────┘  │  │  │
│  │  └───────────────────────────────────────────────────────┘  │  │
│  └─────────────────────────────────────────────────────────────┘  │
│                                                                   │
│  ┌──────────────────┐    ┌──────────────────┐                     │
│  │  S3 (config      │    │  S3 (data        │                     │
│  │  asset)          │    │  bucket)         │                     │
│  │  config.toml     │    │  /home/agent     │                     │
│  └──────────────────┘    └──────────────────┘                     │
└───────────────────────────────────────────────────────────────────┘
Install
# npm
npm install cdk-openab

# pip
pip install cdk-openab
Usage
import { OpenAB } from 'cdk-openab';

new OpenAB(this, 'Broker', {
  configPath: './config.toml',  // required: path to your local config.toml
});

// With custom settings
new OpenAB(this, 'Broker', {
  cpu: 2048,
  memoryLimitMiB: 4096,
  dataS3Prefix: 'my-agent-data',
  configPath: './config.toml',
});
Props
Prop Type Default Description
vpc ec2.IVpc New VPC (public subnet) 自訂 VPC
vpcCidr string 10.168.0.0/16 新建 VPC 的 CIDR
image ecs.ContainerImage ghcr.io/thepagent/openab:dd7e1ca Container image
memoryLimitMiB number 4096 Task memory (MiB)
cpu number 2048 Task CPU units
assignPublicIp boolean true 是否分配 public IP
enableFargateSpot boolean true 啟用 FARGATE_SPOT
dataBucket s3.IBucket 自動建立 持久化資料用的 S3 bucket
dataS3Prefix string agent-data S3 資料前綴
dataLocalPath string /home/agent 資料掛載路徑
configPath string 必填 本地 config.toml 路徑,透過 S3 init container 掛載到 /etc/openab/config.toml
Exposed Resources

OpenAB construct 暴露以下屬性,方便後續串接:

  • broker.vpc — VPC
  • broker.cluster — ECS Cluster
  • broker.service — Fargate Service
  • broker.dataBucket — 持久化資料 S3 Bucket
Container Flow
  1. data-init (init container):從 S3 data bucket 還原 /home/agent 資料,並從 S3 asset 下載 config.toml
  2. app:主應用容器,等待 init 完成後啟動,掛載資料目錄(read-write)和 config(read-only)
  3. data-backup (sidecar):每 10 分鐘定期將 /home/agent sync 到 S3 data bucket,並在收到 SIGTERM(app 停止)時執行最後一次備份

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