Initial Commit

This is a code dump of Status without the HTTP server yet.

.gitignore

@@ -0,0 +1,4 @@
+# Config File
+config.json
+# Generated Data
+data.db

check/check.go

@@ -0,0 +1,34 @@
+package check
+
+import (
+	"time"
+)
+
+//Result denotes the status from a status check.
+type Result uint8
+
+const (
+	//Online means all requests were fulfilled by the remote end.
+	Online Result = iota
+	//Unstable means some requests were fulfilled by the remote end.
+	Unstable
+	//Offline means every requests to the remote end has failed.
+	Offline
+)
+
+//TryCount is the amount of times requests will be made to the remote end.
+const TryCount = 3
+
+func statusFromSuccessCount(count int) Result {
+	if count == 0 {
+		return Offline
+	}
+	if count < TryCount {
+		return Unstable
+	}
+	return Online
+}
+
+func divide(t time.Duration, dividend int) time.Duration {
+	return time.Duration(int(t) / dividend)
+}

check/http.go

@@ -0,0 +1,48 @@
+package check
+
+import (
+	"net/http"
+	"net/http/httptrace"
+	"time"
+)
+
+//HTTPPing returns the response time to fetch a page.
+func HTTPPing(target string) (time.Duration, Result, error) {
+	var totalTime time.Duration
+	var err error
+	successCount := 0
+	okCount := 0
+	for i := 0; i < TryCount; i++ {
+		duration, successful, getErr := timeGet(target)
+		totalTime += duration
+		if getErr != nil {
+			err = getErr
+		}
+		if successful {
+			okCount++
+		}
+		successCount++
+	}
+	return divide(totalTime, successCount), statusFromSuccessCount(okCount), err
+}
+
+func timeGet(url string) (time.Duration, bool, error) {
+	req, _ := http.NewRequest("GET", url, nil)
+
+	var connect time.Time
+	var duration time.Duration
+
+	trace := &httptrace.ClientTrace{
+		ConnectStart: func(network, addr string) { connect = time.Now() },
+		GotFirstResponseByte: func() {
+			duration = time.Since(connect)
+		},
+	}
+
+	req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
+	res, err := http.DefaultTransport.RoundTrip(req)
+	if err != nil {
+		return 0, false, err
+	}
+	return duration, res.StatusCode < 400, nil
+}

check/ping.go

@@ -0,0 +1,19 @@
+package check
+
+import (
+	"time"
+
+	"github.com/sparrc/go-ping"
+)
+
+//ICMPPing returns the ping to the target host.
+func ICMPPing(targetHost string) (time.Duration, Result, error) {
+	pinger, err := ping.NewPinger(targetHost)
+	if err != nil {
+		return 0, Offline, err
+	}
+	pinger.Count = TryCount
+	pinger.Run()
+	stats := pinger.Statistics()
+	return stats.AvgRtt, statusFromSuccessCount(stats.PacketsRecv), nil
+}

checkLoop.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"status/check"
+	"status/db"
+)
+
+type checkTarget struct {
+	CheckType   string `json:"type"`
+	ServiceName string `json:"name"`
+	Target      string `json:"target"`
+}
+
+func checkLoop(targets []checkTarget) {
+	lastTime := time.Now()
+	for {
+		if time.Since(lastTime) < time.Minute {
+			secondsUntilNextMinute := 60 - time.Now().Second()
+			time.Sleep(time.Duration(secondsUntilNextMinute) * time.Second)
+			lastTime = time.Now()
+		}
+
+		for _, t := range targets {
+			currentTime := time.Now()
+			var duration time.Duration
+			var result check.Result
+			var err error
+
+			switch t.CheckType {
+			case "http":
+				duration, result, err = check.HTTPPing(t.Target)
+			case "icmp":
+				duration, result, err = check.ICMPPing(t.Target)
+			default:
+				result = check.Offline
+				err = errors.New("unknown check type")
+			}
+
+			if err != nil {
+				fmt.Printf("[ERROR] Failed checking `%s` with `%s` with error: `%s`", t.Target, t.CheckType, err)
+			}
+
+			entry := db.PingEntry{
+				ServiceName: t.ServiceName,
+				Ping:        duration.Milliseconds(),
+				Status:      result,
+				Time:        currentTime,
+			}
+			entry.AddToDB()
+		}
+	}
+}

config.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"encoding/json"
+	"io/ioutil"
+)
+
+type Config struct {
+	Targets []checkTarget
+}
+
+func ReadConfig(file string) (Config, error) {
+	bytes, err := ioutil.ReadFile(file)
+	if err != nil {
+		return Config{}, err
+	}
+	var result Config
+	json.Unmarshal(bytes, &result)
+	return result, nil
+}

db/db.go

@@ -0,0 +1,17 @@
+package db
+
+import (
+	"github.com/jinzhu/gorm"
+	_ "github.com/jinzhu/gorm/dialects/sqlite"
+)
+
+var db *gorm.DB
+
+func init() {
+	var err error
+	db, err = gorm.Open("sqlite3", "data.db")
+	if err != nil {
+		panic("failed to connect database")
+	}
+	db.AutoMigrate(&PingEntry{})
+}

db/ping.go

@@ -0,0 +1,31 @@
+package db
+
+import (
+	"time"
+
+	"github.com/jinzhu/gorm"
+
+	"status/check"
+)
+
+//PingEntry represents an entry of Ping that is persisted in the DB.
+type PingEntry struct {
+	gorm.Model
+	ServiceName string
+	Time        time.Time
+	Ping        int64
+	Status      check.Result
+}
+
+func (p PingEntry) AddToDB() {
+	if db == nil {
+		panic("DB is nil")
+	}
+	db.Create(&p)
+}
+
+func GetFromDB(serviceName string, from, to time.Time) []*PingEntry {
+	entries := make([]*PingEntry, 0)
+	db.Where("service_name = ? AND time BETWEEN ? AND ?", serviceName, from, to).Find(&entries)
+	return entries
+}

go.mod

@@ -0,0 +1,9 @@
+module status
+
+go 1.14
+
+require (
+	github.com/jinzhu/gorm v1.9.12
+	github.com/sparrc/go-ping v0.0.0-20190613174326-4e5b6552494c
+	golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e // indirect
+)

go.sum

@@ -0,0 +1,35 @@
+github.com/denisenkom/go-mssqldb v0.0.0-20191124224453-732737034ffd h1:83Wprp6ROGeiHFAP8WJdI2RoxALQYgdllERc3N5N2DM=
+github.com/denisenkom/go-mssqldb v0.0.0-20191124224453-732737034ffd/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
+github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5 h1:Yzb9+7DPaBjB8zlTR87/ElzFsnQfuHnVUVqpZZIcV5Y=
+github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5/go.mod h1:a2zkGnVExMxdzMo3M0Hi/3sEU+cWnZpSni0O6/Yb/P0=
+github.com/go-sql-driver/mysql v1.4.1 h1:g24URVg0OFbNUTx9qqY1IRZ9D9z3iPyi5zKhQZpNwpA=
+github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
+github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe h1:lXe2qZdvpiX5WZkZR4hgp4KJVfY3nMkvmwbVkpv1rVY=
+github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/jinzhu/gorm v1.9.12 h1:Drgk1clyWT9t9ERbzHza6Mj/8FY/CqMyVzOiHviMo6Q=
+github.com/jinzhu/gorm v1.9.12/go.mod h1:vhTjlKSJUTWNtcbQtrMBFCxy7eXTzeCAzfL5fBZT/Qs=
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.0.1 h1:HjfetcXq097iXP0uoPCdnM4Efp5/9MsM0/M+XOTeR3M=
+github.com/jinzhu/now v1.0.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/lib/pq v1.1.1 h1:sJZmqHoEaY7f+NPP8pgLB/WxulyR3fewgCM2qaSlBb4=
+github.com/lib/pq v1.1.1/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/mattn/go-sqlite3 v2.0.1+incompatible h1:xQ15muvnzGBHpIpdrNi1DA5x0+TcBZzsIDwmw9uTHzw=
+github.com/mattn/go-sqlite3 v2.0.1+incompatible/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
+github.com/sparrc/go-ping v0.0.0-20190613174326-4e5b6552494c h1:gqEdF4VwBu3lTKGHS9rXE9x1/pEaSwCXRLOZRF6qtlw=
+github.com/sparrc/go-ping v0.0.0-20190613174326-4e5b6552494c/go.mod h1:eMyUVp6f/5jnzM+3zahzl7q6UXLbgSc3MKg/+ow9QW0=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191205180655-e7c4368fe9dd h1:GGJVjV8waZKRHrgwvtH66z9ZGVurTD1MT0n1Bb+q4aM=
+golang.org/x/crypto v0.0.0-20191205180655-e7c4368fe9dd/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e h1:3G+cUijn7XD+S4eJFddp53Pv7+slrESplyjG25HgL+k=
+golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd h1:xhmwyvizuTgC2qz7ZlMluP20uW+C3Rm0FD/WLDX8884=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=

main.go

@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	cfg, err := ReadConfig("config.json")
+	if err != nil {
+		panic(err)
+	}
+	checkLoop(cfg.Targets)
+}