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┌─────────────────────────────────────────────────────────────────────────────┐
│                              客户端请求                                       │
│                                  │                                           │
│                                  ▼                                           │
│  ┌─────────────────────────────────────────────────────────────────────┐    │
│  │                     OpenResty / Nginx 网关                           │    │
│  │  ┌─────────────────────────────────────────────────────────────┐    │    │
│  │  │  upstream_manager_v2.lua                                     │    │    │
│  │  │  • 定时从注册中心拉取节点配置                                   │    │    │
│  │  │  • 加权随机负载均衡                                            │    │    │
│  │  │  • 健康检查（TCP + HTTP）                                      │    │    │
│  │  │  • 共享内存存储节点状态                                         │    │    │
│  │  └─────────────────────────────────────────────────────────────┘    │    │
│  └─────────────────────────────────────────────────────────────────────┘    │
│                                  │                                           │
│                    ┌─────────────┴─────────────┐                            │
│                    ▼                           ▼                            │
│  ┌──────────────────────────┐    ┌──────────────────────────┐              │
│  │   Backend Service A      │    │   Backend Service B      │              │
│  │   (host:port, weight)    │    │   (host:port, weight)    │              │
│  └──────────────────────────┘    └──────────────────────────┘              │
│                    │                           │                            │
│                    └─────────────┬─────────────┘                            │
│                                  │ 注册/心跳                                 │
│                                  ▼                                           │
│  ┌─────────────────────────────────────────────────────────────────────┐    │
│  │                    Kenger-Service 注册中心                           │    │
│  │  ┌─────────────────────────────────────────────────────────────┐    │    │
│  │  │  Flask Backend                                               │    │    │
│  │  │  • /api/upstream/node/register   - 服务注册                   │    │    │
│  │  │  • /api/upstream/node/deregister - 服务注销                   │    │    │
│  │  │  • /api/upstream/heartbeat       - 心跳上报                   │    │    │
│  │  │  • /api/upstream/sync            - 配置同步（供网关拉取）       │    │    │
│  │  └─────────────────────────────────────────────────────────────┘    │    │
│  │                                  │                                   │    │
│  │                                  ▼                                   │    │
│  │  ┌─────────────────────────────────────────────────────────────┐    │    │
│  │  │                        MySQL 数据库                          │    │    │
│  │  │  • upstream_namespace - 命名空间表                           │    │    │
│  │  │  • upstream_node      - 节点表                               │    │    │
│  │  └─────────────────────────────────────────────────────────────┘    │    │
│  └─────────────────────────────────────────────────────────────────────┘    │
│                                                                              │
│  ┌─────────────────────────────────────────────────────────────────────┐    │
│  │                       KengerKit SDK (Python)                        │    │
│  │  • ServiceRegistry 类                                               │    │
│  │  • 自动注册、心跳、注销                                              │    │
│  │  • 支持环境变量配置                                                  │    │
│  └─────────────────────────────────────────────────────────────────────┘    │
└─────────────────────────────────────────────────────────────────────────────┘

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CREATE TABLE upstream_namespace (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(64) NOT NULL UNIQUE COMMENT '命名空间名称',
    description VARCHAR(255) COMMENT '描述',
    health_path VARCHAR(128) DEFAULT '/api/status' COMMENT '默认健康检查路径',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

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CREATE TABLE upstream_node (
    id INT PRIMARY KEY AUTO_INCREMENT,
    namespace_id INT NOT NULL COMMENT '命名空间ID',
    host VARCHAR(128) NOT NULL COMMENT '节点地址',
    port INT NOT NULL COMMENT '端口',
    weight INT DEFAULT 100 COMMENT '权重',
    health_path VARCHAR(128) COMMENT '健康检查路径（覆盖命名空间默认值）',
    status ENUM('online', 'offline') DEFAULT 'online' COMMENT '状态',
    last_heartbeat TIMESTAMP COMMENT '最后心跳时间',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    UNIQUE KEY uk_ns_host_port (namespace_id, host, port),
    FOREIGN KEY (namespace_id) REFERENCES upstream_namespace(id) ON DELETE CASCADE
);

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# 方式1: Authorization Header
Authorization: Bearer <your_api_token>

# 方式2: X-API-Token Header
X-API-Token: <your_api_token>

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-- 加权随机选择
local rand = math.random(1, total_weight)
local cumulative = 0

for _, node in ipairs(available_nodes) do
    cumulative = cumulative + node.weight
    if rand <= cumulative then
        return node
    end
end

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http {
    # 共享内存
    lua_shared_dict upstream_nodes 10m;
    lua_shared_dict healthcheck 1m;

    # Lua 脚本路径
    lua_package_path "/www/server/nginx/nginx/conf/lua/?.lua;;";

    # 初始化
    init_by_lua_block {
        local upstream = require "upstream_manager_v2"
        upstream.init({
            registry_url = "http://127.0.0.1:5000",
            registry_token = "your_token_here",
            sync_interval = 10
        })
    }

    # Worker 初始化
    init_worker_by_lua_block {
        local upstream = require "upstream_manager_v2"
        if ngx.worker.id() == 0 then
            -- 启动同步定时器
            upstream.start_sync_timer()

            -- 启动健康检查定时器
            ngx.timer.every(5, function()
                upstream.health_check()
            end)
        end
    }

    # 代理配置
    server {
        listen 18080;
        server_name _;

        location / {
            set $backend "";

            access_by_lua_block {
                local upstream = require "upstream_manager_v2"
                local backend = upstream.get_backend("jrebel")
                if not backend then
                    ngx.exit(503)
                end
                ngx.var.backend = backend
            }

            proxy_pass http://$backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }
    }
}

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pip install kengerkit

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from kengerkit import KengerClient
from kengerkit.registry import ServiceRegistry

# 创建客户端
client = KengerClient(
    base_url="https://your-kenger-service.com",
    token="your_api_token"
)

# 创建注册器
registry = ServiceRegistry(
    client=client,
    namespace="jrebel",           # 命名空间
    port=58081,                   # 服务端口
    host="43.143.21.219",         # 可选，默认自动获取
    weight=100,                   # 权重
    health_path="/api/status",    # 健康检查路径
    heartbeat_interval=10,        # 心跳间隔（秒）
)

# 启动（注册 + 心跳）
registry.start()

# 你的 Flask 应用
app.run(host='0.0.0.0', port=58081)

# 程序退出时自动注销

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# 从环境变量创建
registry = ServiceRegistry.from_env(client)
registry.start()

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from flask import Flask, jsonify
from kengerkit import KengerClient
from kengerkit.registry import ServiceRegistry

app = Flask(__name__)

@app.route('/api/status')
def health_check():
    return jsonify({"status": "ok"})

@app.route('/api/hello')
def hello():
    return jsonify({"message": "Hello from JRebel service!"})

if __name__ == '__main__':
    # 初始化注册中心客户端
    client = KengerClient(
        base_url="http://127.0.0.1:5000",
        token="defaultToken"
    )

    # 创建并启动服务注册
    registry = ServiceRegistry(
        client=client,
        namespace="jrebel",
        port=58081,
        host="43.143.21.219",
        weight=100
    )
    registry.start()

    # 启动 Flask 应用
    app.run(host='0.0.0.0', port=58081)

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cd kenger-service
pip install -r requirements.txt
python app.py

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-- upstream_manager_v2.lua
-- 动态 upstream 管理模块（注册中心模式）
-- 从注册中心拉取配置，Nginx 只负责负载均衡
-- 所有节点管理通过后端注册中心完成

local _M = {}

local cjson = require "cjson"
local http = require "resty.http"

-- 共享内存
local upstream_nodes = ngx.shared.upstream_nodes
local healthcheck = ngx.shared.healthcheck

-- 常量
local DEFAULT_NS = "default"
local HEALTH_CHECK_PATH = "/api/status"
local HEALTH_CHECK_TIMEOUT = 2000  -- 2秒
local SYNC_INTERVAL = 10  -- 同步间隔（秒）

-- 注册中心配置（模块级变量，可通过 init 配置）
local REGISTRY_URL = ""
local REGISTRY_TOKEN = ""
local SYNC_VERSION_KEY = "sync:version"

-- 获取 namespace 的 key
local function get_ns_key(ns)
    return "ns:" .. (ns or DEFAULT_NS)
end

-- 初始化（传入注册中心配置）
function _M.init(config)
    config = config or {}
    REGISTRY_URL = config.registry_url or os.getenv("KENGER_REGISTRY_URL") or "http://127.0.0.1:5000"
    REGISTRY_TOKEN = config.registry_token or os.getenv("KENGER_REGISTRY_TOKEN") or ""

    if config.sync_interval then
        SYNC_INTERVAL = config.sync_interval
    end

    ngx.log(ngx.INFO, "upstream_manager_v2 initialized, registry: ", REGISTRY_URL, ", sync_interval: ", SYNC_INTERVAL, "s")
end

-- 获取指定 namespace 的所有节点
function _M.get_all_nodes(ns)
    local ns_key = get_ns_key(ns)
    local nodes_json = upstream_nodes:get(ns_key)
    if not nodes_json then
        return {}
    end

    local ok, nodes = pcall(cjson.decode, nodes_json)
    if not ok then
        ngx.log(ngx.ERR, "failed to decode nodes for ", ns_key, ": ", nodes)
        return {}
    end

    -- 添加健康状态
    for _, node in ipairs(nodes) do
        local key = ns_key .. ":" .. node.host .. ":" .. node.port
        local health = healthcheck:get(key)
        node.healthy = (health ~= "unhealthy")
    end

    return nodes
end

-- 获取所有 namespace 及其节点
function _M.get_all_namespaces()
    local keys = upstream_nodes:get_keys(100)  -- 最多获取 100 个
    local result = {}

    for _, key in ipairs(keys) do
        if key:sub(1, 3) == "ns:" then
            local ns = key:sub(4)
            result[ns] = _M.get_all_nodes(ns)
        end
    end

    return result
end

-- 保存节点列表（内部使用）
local function save_nodes(ns, nodes)
    local ns_key = get_ns_key(ns)
    local ok, json = pcall(cjson.encode, nodes)
    if not ok then
        return false, "failed to encode nodes"
    end

    local ok, err = upstream_nodes:set(ns_key, json)
    if not ok then
        return false, err
    end

    return true
end

-- 加权随机选择算法
local function weighted_random_select(ns, nodes)
    local ns_key = get_ns_key(ns)
    local total_weight = 0
    local available_nodes = {}

    -- 只选择健康且权重大于0的节点
    for _, node in ipairs(nodes) do
        local key = ns_key .. ":" .. node.host .. ":" .. node.port
        local health = healthcheck:get(key)

        if health ~= "unhealthy" and node.weight > 0 then
            total_weight = total_weight + node.weight
            table.insert(available_nodes, node)
        end
    end

    if #available_nodes == 0 then
        return nil
    end

    if #available_nodes == 1 then
        return available_nodes[1]
    end

    -- 加权随机选择
    local rand = math.random(1, total_weight)
    local cumulative = 0

    for _, node in ipairs(available_nodes) do
        cumulative = cumulative + node.weight
        if rand <= cumulative then
            return node
        end
    end

    return available_nodes[1]
end

-- 获取后端地址（指定 namespace）
function _M.get_backend(ns)
    local nodes = _M.get_all_nodes(ns)

    if #nodes == 0 then
        ngx.log(ngx.WARN, "no nodes available for ns=", ns or DEFAULT_NS)
        return nil
    end

    local node = weighted_random_select(ns, nodes)
    if not node then
        ngx.log(ngx.WARN, "no healthy nodes available for ns=", ns or DEFAULT_NS)
        return nil
    end

    return node.host .. ":" .. node.port
end

-- 健康检查（检查所有 namespace 的节点）
function _M.health_check()
    local all_ns = _M.get_all_namespaces()

    for ns, nodes in pairs(all_ns) do
        local ns_key = get_ns_key(ns)

        for _, node in ipairs(nodes) do
            local key = ns_key .. ":" .. node.host .. ":" .. node.port
            local health_path = node.health_path or HEALTH_CHECK_PATH

            local sock = ngx.socket.tcp()
            sock:settimeout(HEALTH_CHECK_TIMEOUT)

            local ok, err = sock:connect(node.host, node.port)
            if ok then
                local req = "GET " .. health_path .. " HTTP/1.0\r\nHost: " .. node.host .. ":" .. node.port .. "\r\n\r\n"
                sock:send(req)

                local line, err = sock:receive("*l")
                if line and line:match("200") then
                    healthcheck:set(key, "healthy", 30)
                    ngx.log(ngx.DEBUG, "health check passed: ", key)
                else
                    healthcheck:set(key, "unhealthy", 30)
                    ngx.log(ngx.WARN, "health check failed: ", key, " - ", err or "non-200")
                end

                sock:close()
            else
                healthcheck:set(key, "unhealthy", 30)
                ngx.log(ngx.WARN, "health check failed: ", key, " - ", err)
            end
        end
    end
end

-- 获取健康状态（只读）
function _M.get_health_status(ns)
    local nodes
    if ns then
        nodes = _M.get_all_nodes(ns)
    else
        -- 返回所有 namespace 的状态
        return _M.get_all_namespaces()
    end

    local ns_key = get_ns_key(ns)
    local result = {
        namespace = ns or DEFAULT_NS,
        total = #nodes,
        healthy = 0,
        unhealthy = 0,
        nodes = {}
    }

    for _, node in ipairs(nodes) do
        local key = ns_key .. ":" .. node.host .. ":" .. node.port
        local health = healthcheck:get(key)
        local is_healthy = (health ~= "unhealthy")

        if is_healthy then
            result.healthy = result.healthy + 1
        else
            result.unhealthy = result.unhealthy + 1
        end

        table.insert(result.nodes, {
            address = node.host .. ":" .. node.port,
            weight = node.weight,
            healthy = is_healthy,
            health_path = node.health_path
        })
    end

    return result
end

-- ==================== 注册中心同步功能 ====================

-- 从注册中心拉取配置
function _M.sync_from_registry(ns)
    if REGISTRY_URL == "" then
        ngx.log(ngx.WARN, "REGISTRY_URL not configured, skip sync")
        return false, "registry url not configured"
    end

    local httpc = http.new()
    httpc:set_timeout(5000)  -- 5秒超时

    local url = REGISTRY_URL .. "/api/upstream/sync"
    if ns then
        url = url .. "?ns=" .. ns
    end

    local headers = {
        ["Content-Type"] = "application/json"
    }

    if REGISTRY_TOKEN ~= "" then
        headers["Authorization"] = "Bearer " .. REGISTRY_TOKEN
    end

    local res, err = httpc:request_uri(url, {
        method = "GET",
        headers = headers
    })

    if not res then
        ngx.log(ngx.ERR, "failed to sync from registry: ", err)
        return false, err
    end

    if res.status ~= 200 then
        ngx.log(ngx.ERR, "registry returned status: ", res.status)
        return false, "status " .. res.status
    end

    local ok, data = pcall(cjson.decode, res.body)
    if not ok then
        ngx.log(ngx.ERR, "failed to decode registry response: ", data)
        return false, "decode error"
    end

    if data.code ~= 0 then
        ngx.log(ngx.ERR, "registry error: ", data.message)
        return false, data.message
    end

    -- 检查版本号，避免重复更新
    local current_version = upstream_nodes:get(SYNC_VERSION_KEY)
    if current_version and data.version and tonumber(current_version) >= tonumber(data.version) then
        ngx.log(ngx.DEBUG, "sync skipped, version unchanged: ", current_version)
        return true
    end

    -- 更新节点数据
    local sync_data = data.data
    if not sync_data then
        return true
    end

    for namespace, ns_data in pairs(sync_data) do
        local nodes = {}
        for _, node in ipairs(ns_data.nodes or {}) do
            table.insert(nodes, {
                host = node.host,
                port = node.port,
                weight = node.weight or 100,
                health_path = node.health_path or ns_data.health_path or HEALTH_CHECK_PATH,
                created_at = ngx.time(),
                updated_at = ngx.time()
            })
        end

        local ok, err = save_nodes(namespace, nodes)
        if ok then
            ngx.log(ngx.INFO, "synced namespace: ", namespace, " nodes: ", #nodes)
        else
            ngx.log(ngx.ERR, "failed to save nodes for ", namespace, ": ", err)
        end
    end

    -- 更新版本号
    if data.version then
        upstream_nodes:set(SYNC_VERSION_KEY, data.version)
    end

    return true
end

-- 定时同步任务（在 init_worker_by_lua 中调用）
function _M.start_sync_timer()
    if REGISTRY_URL == "" then
        ngx.log(ngx.WARN, "REGISTRY_URL not configured, sync timer not started")
        return
    end

    local handler
    handler = function(premature)
        if premature then
            return
        end

        -- 执行同步
        local ok, err = pcall(_M.sync_from_registry)
        if not ok then
            ngx.log(ngx.ERR, "sync error: ", err)
        end

        -- 重新设置定时器
        local ok, err = ngx.timer.at(SYNC_INTERVAL, handler)
        if not ok then
            ngx.log(ngx.ERR, "failed to create sync timer: ", err)
        end
    end

    -- 启动首次同步（延迟1秒）
    local ok, err = ngx.timer.at(1, handler)
    if not ok then
        ngx.log(ngx.ERR, "failed to create initial sync timer: ", err)
    else
        ngx.log(ngx.INFO, "sync timer started, interval: ", SYNC_INTERVAL, "s, registry: ", REGISTRY_URL)
    end
end

-- 获取当前配置信息（只读）
function _M.get_config()
    return {
        registry_url = REGISTRY_URL,
        token_set = (REGISTRY_TOKEN ~= ""),
        sync_interval = SYNC_INTERVAL
    }
end

return _M

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        #####################################################
        # 动态 upstream 配置 V2（注册中心模式）
        #####################################################

        # Lua 共享内存
        lua_shared_dict upstream_nodes 10m;
        lua_shared_dict healthcheck 1m;

        # Lua 脚本路径
        lua_package_path "/www/server/nginx/nginx/conf/lua/?.lua;;";

        # 初始化（配置注册中心地址和 Token）
        init_by_lua_block {
            local upstream = require "upstream_manager_v2"
            upstream.init({
                registry_url = "http://127.0.0.1:5000",
                registry_token = "这里是token鉴权的",
                sync_interval = 10
            })
        }

        # Worker 初始化（启动同步和健康检查定时器）
        init_worker_by_lua_block {
            local upstream = require "upstream_manager_v2"
            if ngx.worker.id() == 0 then
                -- 启动注册中心同步定时器
                upstream.start_sync_timer()

                -- 启动健康检查定时器
                local ok, err = ngx.timer.every(5, function()
                    upstream.health_check()
                end)
                if not ok then
                    ngx.log(ngx.ERR, "failed to create health check timer: ", err)
                end
            end
        }

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server {
    listen 18080;
    server_name _;

    # 访问日志（可选）
    access_log /www/wwwlogs/jrebel.log;
    error_log /www/wwwlogs/jrebel.error.log;

    location / {
        set $backend "";

        # 动态选择后端
        access_by_lua_block {
            local upstream = require "upstream_manager_v2"
            local backend = upstream.get_backend("jrebel")  -- 命名空间名称
            if not backend then
                ngx.log(ngx.ERR, "no available backend for jrebel")
                ngx.exit(503)
            end
            ngx.var.backend = backend
        }
    
        # 关键：传递原始 Host 头（包含端口）
        proxy_set_header Host $host:$server_port;
        # 或者使用 $http_host（如果客户端请求中包含端口）
        # proxy_set_header Host $http_host;

        # 其他常用头部
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Port $server_port;

        # 代理到动态后端
        proxy_pass http://$backend;

        # 超时设置
        proxy_connect_timeout 10s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }
}

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nginx: [error] init_by_lua error: ...lua/upstream_manager_v2.lua:9: module 'resty.http' not found

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nginx: [error] init_by_lua error: ...resty/http.lua:xx: module 'resty.http_connect' not found

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cd /www/server/nginx/lualib/resty/

# 1. 下载主模块
wget https://raw.githubusercontent.com/ledgetech/lua-resty-http/master/lib/resty/http.lua

# 2. 下载 headers 模块
wget https://raw.githubusercontent.com/ledgetech/lua-resty-http/master/lib/resty/http_headers.lua

# 3. 下载 connect 模块（重要！很容易漏掉）
wget https://raw.githubusercontent.com/ledgetech/lua-resty-http/master/lib/resty/http_connect.lua

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ls -la /www/server/nginx/lualib/resty/ | grep http
# 应该看到：
# http.lua
# http_connect.lua
# http_headers.lua

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# 1. 创建 Lua 脚本目录（如果不存在）
mkdir -p /www/server/nginx/nginx/conf/lua

# 2. 上传 Lua 脚本
# 将 upstream_manager_v2.lua 内容保存到：
# /www/server/nginx/nginx/conf/lua/upstream_manager_v2.lua

# 3. 安装 HTTP 模块依赖
cd /www/server/nginx/lualib/resty/
wget https://raw.githubusercontent.com/ledgetech/lua-resty-http/master/lib/resty/http.lua
wget https://raw.githubusercontent.com/ledgetech/lua-resty-http/master/lib/resty/http_headers.lua
wget https://raw.githubusercontent.com/ledgetech/lua-resty-http/master/lib/resty/http_connect.lua

# 4. 修改 nginx.conf（添加 init_by_lua_block 等配置）

# 5. 创建网站配置
# 将代理配置保存到：/www/server/panel/vhost/nginx/jrebel.conf

# 6. 测试配置
nginx -t

# 7. 重启 Nginx
systemctl restart nginx
# 或
/etc/init.d/nginx restart

# 8. 查看日志确认启动成功
tail -f /www/wwwlogs/nginx_error.log
# 应该看到：
# upstream_manager_v2 initialized, registry: http://127.0.0.1:5000
# sync timer started, interval: 10s

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# 1. 查看同步数据（从注册中心）
curl -X GET "http://localhost:5000/api/upstream/sync?ns=jrebel" \
  -H "Authorization: Bearer defaultToken"

# 2. 查看 Nginx 缓存的节点
curl http://127.0.0.1:8081/nodes?ns=jrebel

# 3. 查看健康状态
curl http://127.0.0.1:8081/health?ns=jrebel

# 4. 查看配置信息
curl http://127.0.0.1:8081/config

# 5. 测试代理
curl http://43.143.21.219:18080/api/status

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# 降低某节点权重（灰度发布）
curl -X POST "http://localhost:5000/api/upstream/node/weight" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer defaultToken" \
  -d '{"ns": "jrebel", "host": "43.143.21.219", "port": 58081, "weight": 10}'

# 恢复权重
curl -X POST "http://localhost:5000/api/upstream/node/weight" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer defaultToken" \
  -d '{"ns": "jrebel", "host": "43.143.21.219", "port": 58081, "weight": 100}'

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curl -X POST "http://localhost:5000/api/upstream/node/deregister" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer defaultToken" \
  -d '{"ns": "jrebel", "host": "43.143.21.219", "port": 58081}'

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# 测试 Nginx 配置
nginx -t

# 重启 Nginx
systemctl restart nginx

# 查看 Nginx 日志
tail -f /www/wwwlogs/nginx_error.log

# 查看同步数据
curl -X GET "http://localhost:5000/api/upstream/sync" \
  -H "Authorization: Bearer defaultToken"

# 查看节点状态
curl http://127.0.0.1:8081/nodes
curl http://127.0.0.1:8081/health

# 查看配置信息
curl http://127.0.0.1:8081/config