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server.go
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server.go
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/*
* Copyright (c) 2022, MegaEase
* All rights reserved.
*
* 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
*
* https://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 web
import (
"encoding/json"
"fmt"
"net"
"net/http"
"strconv"
"strings"
"time"
"github.com/megaease/easeprobe/conf"
"github.com/megaease/easeprobe/global"
"github.com/megaease/easeprobe/probe"
"github.com/megaease/easeprobe/report"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
log "github.com/sirupsen/logrus"
)
var probers *[]probe.Prober
func getRefreshInterval(refersh string) time.Duration {
interval := conf.Get().Settings.HTTPServer.AutoRefreshTime
if strings.TrimSpace(refersh) == "" {
return interval
}
r, err := time.ParseDuration(refersh)
if err != nil {
log.Errorf("[Web] Invalid refresh time: %s", err)
return interval
}
return r
}
func getStatus(status string) *probe.Status {
if status == "" {
return nil
}
var s probe.Status
s.Status(status)
return &s
}
func toFloat(str string) (float64, error) {
return strconv.ParseFloat(str, 64)
}
func toInt(str string) (int, error) {
return strconv.Atoi(str)
}
func getNum[T any](str string, _default T, convert func(string) (T, error)) T {
if str == "" {
return _default
}
n, err := convert(str)
if err != nil {
log.Debugf("[Web] Invalid number value: %s", err)
return _default
}
return n
}
func getFilter(req *http.Request) (*report.SLAFilter, error) {
filter := &report.SLAFilter{}
filter.Name = strings.TrimSpace(req.URL.Query().Get("name"))
filter.Kind = strings.TrimSpace(req.URL.Query().Get("kind"))
filter.Endpoint = strings.TrimSpace(req.URL.Query().Get("ep"))
filter.Status = getStatus(req.URL.Query().Get("status"))
filter.Message = strings.TrimSpace(req.URL.Query().Get("msg"))
filter.SLAGreater = getNum(req.URL.Query().Get("gte"), 0, toFloat)
filter.SLALess = getNum(req.URL.Query().Get("lte"), 100, toFloat)
filter.PageNum = getNum(req.URL.Query().Get("pg"), 1, toInt)
filter.PageSize = getNum(req.URL.Query().Get("sz"), global.DefaultPageSize, toInt)
if err := filter.Check(); err != nil {
log.Errorf(err.Error())
return nil, err
}
return filter, nil
}
func slaHTML(w http.ResponseWriter, req *http.Request) {
interval := getRefreshInterval(req.URL.Query().Get("refresh"))
filter, err := getFilter(req)
if err != nil {
w.Write([]byte(err.Error()))
return
}
refresh := fmt.Sprintf("%d", interval.Milliseconds())
html := []byte(report.SLAHTMLFilter(*probers, filter) + report.AutoRefreshJS(refresh))
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Write(html)
}
func slaJSON(w http.ResponseWriter, req *http.Request) {
filter, err := getFilter(req)
if err != nil {
buf, e := json.Marshal(err)
if e != nil {
w.Write([]byte(err.Error()))
return
}
w.Write(buf)
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
_probers := filter.Filter(*probers)
w.Write([]byte(report.SLAJSON(_probers)))
}
// SetProbers set the probers
func SetProbers(p []probe.Prober) {
probers = &p
}
// Server is the http server
func Server() {
c := conf.Get()
host := c.Settings.HTTPServer.IP
port := c.Settings.HTTPServer.Port
// Configure the http server
if len(host) > 0 && net.ParseIP(host) == nil {
host = global.DefaultHTTPServerIP
}
p, err := strconv.Atoi(port)
if err != nil || p <= 1024 || p > 65535 {
log.Warnf("[Web] Invalid port number: %s, use the default value: %s", port, global.DefaultHTTPServerPort)
port = global.DefaultHTTPServerPort
} else {
port = c.Settings.HTTPServer.Port
}
// Configure the auto refresh time of the SLA page
if c.Settings.HTTPServer.AutoRefreshTime == 0 {
c.Settings.HTTPServer.AutoRefreshTime = global.DefaultProbeInterval
}
log.Debugf("[Web] Auto refresh interval time: %s", c.Settings.HTTPServer.AutoRefreshTime)
// Prepare the router
r := chi.NewRouter()
filename := c.Settings.HTTPServer.AccessLog.File
if len(filename) > 0 {
log.Infof("[Web] Access Log output file: %s", filename)
logger := c.Settings.HTTPServer.AccessLog.Logger
r.Use(NewStructuredLogger(logger))
}
r.Use(middleware.RealIP)
r.Use(middleware.Logger)
r.Use(middleware.Recoverer)
r.Use(middleware.RedirectSlashes)
r.Use(middleware.StripSlashes)
r.Get("/", slaHTML)
r.Get("/metrics", promhttp.Handler().ServeHTTP)
r.Route("/api/v1", func(r chi.Router) {
r.Get("/sla", slaJSON)
})
r.NotFound(slaHTML)
server, err := net.Listen("tcp", host+":"+port)
if err != nil {
log.Fatalf("[Web] Failed to start the http server: %s", err)
}
log.Infof("[Web] HTTP server is listening on %s:%s", host, port)
// Start the http server
go func() {
if err := http.Serve(server, r); err != nil {
log.Errorf("[Web] HTTP server error: %s", err)
}
}()
}