glkvm-cloud/server.go

/*
 * MIT License
 *
 * Copyright (c) 2019 Jianhui Zhao <zhaojh329@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package main

import (
    "net"
    "net/http"
    "sync"
    "sync/atomic"

    "github.com/rs/zerolog/log"
)

type RttyServer struct {
    mu            sync.RWMutex
    groups        sync.Map
    cfg           Config
    httpProxyPort int
}

type DeviceGroup struct {
    devices sync.Map
    count   atomic.Int32
}

func (srv *RttyServer) Run() error {
    log.Debug().Msgf("%+v", srv.cfg)

    if srv.cfg.PprofAddr != "" {
        go srv.ListenPprof()
    }

    log.Info().Msgf("SslCert: %s,SslKey: %s", srv.cfg.SslCert, srv.cfg.SslKey)

    go srv.ListenDevices()
    go srv.ListenHttpProxy()

    return srv.ListenAPI()
}

func (srv *RttyServer) ListenPprof() {
    ln, err := net.Listen("tcp", srv.cfg.PprofAddr)
    if err != nil {
        log.Error().Err(err).Msgf("Failed to start pprof server")
        return
    }
    defer ln.Close()

    addr := ln.Addr().(*net.TCPAddr)
    log.Info().Msgf("Starting pprof server on: %s", addr)

    host := addr.IP.String()
    if host == "0.0.0.0" || host == "::" {
        host = "localhost"
    }
    log.Info().Msgf("Access pprof at: http://%s:%d/debug/pprof/", host, addr.Port)

    err = http.Serve(ln, nil)
    if err != nil {
        log.Error().Err(err).Msgf("pprof server failed")
    }
}

func (srv *RttyServer) GetDevice(group, id string) *Device {
    srv.mu.RLock()
    defer srv.mu.RUnlock()

    g := srv.GetGroup(group, false)
    if g == nil {
        return nil
    }

    if v, ok := g.devices.Load(id); ok {
        return v.(*Device)
    }

    return nil
}

func (srv *RttyServer) AddDevice(dev *Device) bool {
    srv.mu.Lock()
    defer srv.mu.Unlock()

    g := srv.GetGroup(dev.group, true)

    if _, loaded := g.devices.LoadOrStore(dev.id, dev); loaded {
        return false
    }

    g.count.Add(1)

    return true
}

func (srv *RttyServer) DelDevice(dev *Device) {
    srv.mu.Lock()
    defer srv.mu.Unlock()

    g := srv.GetGroup(dev.group, false)
    if g == nil {
        return
    }

    if deleted := g.devices.CompareAndDelete(dev.id, dev); deleted {
        if g.count.Add(-1) == 0 {
            srv.groups.Delete(dev.group)
        }
    }
}

func (srv *RttyServer) GetGroup(group string, create bool) *DeviceGroup {
    if create {
        val, _ := srv.groups.LoadOrStore(group, &DeviceGroup{})
        return val.(*DeviceGroup)
    } else {
        val, ok := srv.groups.Load(group)
        if !ok {
            return nil
        }
        return val.(*DeviceGroup)
    }
}