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/*
* Copyright (C) 2017-2018 "IoT.bzh"
* Author Sebastien Douheret <sebastien@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package agent
import (
"fmt"
"io"
"strings"
"time"
common "gerrit.automotivelinux.org/gerrit/src/xds/xds-common.git/golib"
uuid "github.com/satori/go.uuid"
)
// XdsSupervisor .
type XdsSupervisor struct {
*Context
ID string
BaseURL string
ConnRetry int
Connected bool
Disabled bool
// Private fields
client *common.HTTPClient
logOut io.Writer
cbOnConnect OnConnectedXdsSupervCB
}
// XdsSuperVRequest Resquest field of a reply
type XdsSuperVRequest struct {
Status string `json:"status"`
Info string `json:"info"`
}
// XdsSuperVReply Reply structure of XDS Supervision Daemon
type XdsSuperVReply struct {
JType string `json:"jtype"`
Request XdsSuperVRequest `json:"request"`
Response interface{} `json:"response"`
}
// XdsSuperVTraceConfig
type XdsSuperVTraceConfig struct {
Pid int `json:"pid"`
Pids []int `json:"pids"`
WsName string `json:"ws"`
}
// OnConnectedXdsSupervCB connect callback
type OnConnectedXdsSupervCB func(svr *XdsSupervisor) error
// NewXdsSupervisor creates an instance of XdsSupervisor
func NewXdsSupervisor(ctx *Context) *XdsSupervisor {
return &XdsSupervisor{
Context: ctx,
ID: "XdsSupervisor-" + uuid.NewV1().String(),
BaseURL: ctx.Config.FileConf.ProfileConf.XDSBinder.URL,
ConnRetry: ctx.Config.FileConf.ProfileConf.XDSBinder.ConnRetry,
Connected: false,
Disabled: false,
logOut: ctx.Log.Out,
}
}
// Connect Establish HTTP connection with XDS Supervisor Dameon
func (xs *XdsSupervisor) Connect() error {
var err error
var retry int
xs.Disabled = false
xs.Connected = false
err = nil
for retry = xs.ConnRetry; retry > 0; retry-- {
if err = xs._CreateConnectHTTP(); err == nil {
break
}
if retry == xs.ConnRetry {
// Notify only on the first conn error
// doing that avoid 2 notifs (conn false; conn true) on startup
xs._NotifyState()
}
xs.Log.Infof("Establishing connection to XDS Supervisor daemon (retry %d/%d)", retry, xs.ConnRetry)
time.Sleep(time.Second)
}
if retry == 0 {
// FIXME: re-use _Reconnect to wait longer in background
return fmt.Errorf("Connection to XDS Supervisor daemon failure")
}
if err != nil {
return err
}
// Check HTTP connection and establish WS connection
err = xs._Connect(false)
return err
}
// ConnectOn Register a callback on events reception
func (xs *XdsSupervisor) ConnectOn(f OnConnectedXdsSupervCB) error {
xs.cbOnConnect = f
return nil
}
// GetVersion Send Get request to retrieve XDS Supervision version
func (xs *XdsSupervisor) GetVersion(res interface{}) error {
// FIXME add suffix URLSuffix in common HTTP client lib instead of _BuildURL
return xs.client.Get(xs._BuildURL("/version"), &res)
}
// GetTopo Send Get request to retrieve Services/Daemons topology
func (xs *XdsSupervisor) GetTopo(res interface{}) error {
return xs.client.Get(xs._BuildURL("/list"), &res)
}
// StartTrace Send Supervisor config and start tracing
func (xs *XdsSupervisor) StartTrace(cfg XdsSuperVTraceConfig, res interface{}) error {
return xs.client.Post(xs._BuildURL("/trace/start"), cfg, &res)
}
// StopTrace Send Supervisor stop tracing
func (xs *XdsSupervisor) StopTrace(res interface{}) error {
var cfg interface{}
return xs.client.Post(xs._BuildURL("/trace/stop"), cfg, res)
}
/***
** Private functions
***/
// _BuildURL .
func (xs *XdsSupervisor) _BuildURL(url string) string {
return url + "?token=HELLO&uuid=magic"
}
// Create HTTP client
func (xs *XdsSupervisor) _CreateConnectHTTP() error {
var err error
// FIXME SEB - Client key not in header but in cookie
// temporary workaround: used _BuildURL to append uuid=magic in URL
// map[Set-Cookie:[x-afb-uuid-5678=2b185cc3-276b-4097-91fa-d607eaf937e6; Path=/api; Max-Age=32000000; ...
//port := strings.Split(xs.BaseURL, ":")[2]
//"x-afb-uuid-" + port
xs.client, err = common.HTTPNewClient(xs.BaseURL,
common.HTTPClientConfig{
//HeaderClientKeyName: "Xds-Sid",
HeaderAPIKeyName: "token",
Apikey: "HELLO",
URLPrefix: "/api/xds",
CsrfDisable: true,
LogOut: xs.logOut,
LogPrefix: "XDSSUPERV: ",
LogLevel: common.HTTPLogLevelWarning,
})
xs.client.SetLogLevel(xs.Log.Level.String())
if err != nil {
msg := ": " + err.Error()
if strings.Contains(err.Error(), "connection refused") {
msg = fmt.Sprintf("(url: %s)", xs.BaseURL)
}
return fmt.Errorf("ERROR: cannot connect to XDS Supervisor %s", msg)
}
if xs.client == nil {
return fmt.Errorf("ERROR: cannot connect to XDS Supervisor (null client)")
}
return nil
}
// _Connect Established HTTP and WS connection
func (xs *XdsSupervisor) _Connect(reConn bool) error {
var res interface{}
if err := xs.client.Get(xs._BuildURL("/ping"), &res); err != nil {
xs.Connected = false
if !reConn {
xs._NotifyState()
}
return err
}
xs.Connected = true
// Call OnConnect callback
if xs.cbOnConnect != nil {
xs.cbOnConnect(xs)
}
xs._NotifyState()
return nil
}
// _NotifyState Send event to notify changes
func (xs *XdsSupervisor) _NotifyState() {
/* TODO
evSts := xaapiv1.ServerCfg{
ID: xs.ID,
URL: xs.BaseURL,
APIURL: xs.APIURL,
PartialURL: xs.PartialURL,
ConnRetry: xs.ConnRetry,
Connected: xs.Connected,
}
if err := xs.events.Emit(xaapiv1.EVTServerConfig, evSts, ""); err != nil {
xs.Log.Warningf("Cannot notify XdsServer state change: %v", err)
}
*/
}
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