skynet-中监测服务是否挂掉

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写个监测服务，监测所有服务，一旦某个服务dump掉，就立即发个邮件通知一下.

  1. main 里第一个先启动 moniter 服务（unique service）
    skynet.uniqueservice ("moniter")

  2. 其他服务启动后，向 moniter 注册一下，加入moniter的监测列表中

  3. 在 moniter 中定时轮询，安全调用(xpcall) 一下每个监测中的服务的心跳方法(CMD.heart_beat() )，如果服务dump掉，xpcall 会捕捉到错误，并返回error， 此时发个邮件通知一下就可以。

监测服务 moniter

moniter.lua

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require "functions"
local skynet = require "skynet"
local syslog = require "syslog"

local traceback = debug.traceback
local IntervalTime = 5 * 100
local serTab = {}

local CMD = {}
function CMD.register(source, _serName)
    serTab[source] = _serName
end

-- 服务宕机，发邮件通知
local function serviceDump(_serName)
    syslog.errf("--- Error: service 【%s】 dump!", _serName)
end

local function callService(_addr)
    skynet.call(_addr, "lua", "heart_beat")
end

--[[
检测各个服务是否宕机
]]
local function heartBeatScheduler()
    -- syslog.debugf("---------- 【heart beat Begin】 ----------")
    for k,v in pairs(serTab) do
        local ok, _ = xpcall (callService, traceback, k)
        if not ok then
            serviceDump(v)
            serTab[k] = nil
        else
            -- syslog.debugf("--- service running:【%s】, addr:%x", v, k)
        end
    end
    -- syslog.debugf("---------- 【heart beat End】 ----------")

    skynet.timeout(IntervalTime, heartBeatScheduler)
end

skynet.start (function ()
    skynet.timeout(IntervalTime, heartBeatScheduler)
    skynet.dispatch ("lua", function (_, source, command, ...)
        local f = CMD[command]
        if not f then
            syslog.warningf ("unhandled message(%s)", command)
            return skynet.ret ()
        end

        local ok, ret = xpcall (f, traceback, source, ...)
        if not ok then
            syslog.warningf ("handle message(%s) failed : %s", command, ret)
            return skynet.ret ()
        end
        skynet.retpack (ret)
    end)
end)

被监测的服务，以 friendserver 为例

friendserver.lua

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function CMD.open (source, conf)
    syslog.debugf("--- friend server open")
    local moniter = skynet.uniqueservice ("moniter")
    skynet.call(moniter, "lua", "register", "friendserver")
end

function CMD.heart_beat ()
    -- print("--- heart_beat friendserver")
end

local traceback = debug.traceback
skynet.start (function ()
    -- skynet.timeout (800, function() skynet.exit() end) -- for test moniter

    skynet.dispatch ("lua", function (_, source, command, ...)
        local f = CMD[command]
        if not f then
            syslog.warningf ("unhandled message(%s)", command)
            return skynet.ret ()
        end

        local ok, ret = xpcall (f, traceback, source, ...)
        if not ok then
            syslog.warningf ("handle message(%s) failed : %s", command, ret)
            return skynet.ret ()
        end
        skynet.retpack (ret)
    end)
end)

mian.lua中启动

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local friendserver = skynet.uniqueservice ("friendserver")
skynet.call (friendserver, "lua", "open")

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