Add Healthcheck; close #3

config/config.yaml

@@ -1,2 +1,6 @@
+control:
+  uri: "http://192.0.2.1:8080"
+  bind-addr: "192.0.2.1:8080"
+
 logger:
   level: "debug"

go.mod

@@ -4,15 +4,42 @@ go 1.22.7
 
 require (
 	github.com/adrg/xdg v0.5.3
+	github.com/gin-gonic/gin v1.10.0
+	github.com/nextmn/json-api v0.0.13
 	github.com/nextmn/logrus-formatter v0.0.1
 	github.com/sirupsen/logrus v1.9.3
 	github.com/urfave/cli/v2 v2.27.5
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.5 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/gofrs/uuid v4.4.0+incompatible // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
 	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
 	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
 )

go.sum

@@ -1,31 +1,110 @@
 github.com/adrg/xdg v0.5.3 h1:xRnxJXne7+oWDatRhR1JLnvuccuIeCoBu2rtuLqQB78=
 github.com/adrg/xdg v0.5.3/go.mod h1:nlTsY+NNiCBGCK2tpm09vRqfVzrc2fLmXGpBLF0zlTQ=
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
+github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
+github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY=
 github.com/cpuguy83/go-md2man/v2 v2.0.5 h1:ZtcqGrnekaHpVLArFSe4HK5DoKx1T0rq2DwVB0alcyc=
 github.com/cpuguy83/go-md2man/v2 v2.0.5/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
+github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
+github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
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 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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internal/app/control.go

@@ -0,0 +1,61 @@
+// Copyright 2024 Louis Royer and the NextMN contributors. All rights reserved.
+// Use of this source code is governed by a MIT-style license that can be
+// found in the LICENSE file.
+// SPDX-License-Identifier: MIT
+
+package app
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/nextmn/json-api/healthcheck"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+)
+
+type HttpServerEntity struct {
+	srv *http.Server
+}
+
+func NewHttpServerEntity(bindAddr string) *HttpServerEntity {
+	// TODO: gin.SetMode(gin.DebugMode) / gin.SetMode(gin.ReleaseMode) depending on log level
+	r := gin.Default()
+	r.GET("/status", Status)
+	logrus.WithFields(logrus.Fields{"http-addr": bindAddr}).Info("HTTP Server created")
+	e := HttpServerEntity{
+		srv: &http.Server{
+			Addr:    bindAddr,
+			Handler: r,
+		},
+	}
+	return &e
+}
+
+func (e *HttpServerEntity) Start() {
+	go func() {
+		logrus.Info("Starting HTTP Server")
+		if err := e.srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			logrus.WithError(err).Error("Http Server error")
+		}
+	}()
+}
+
+func (e *HttpServerEntity) Stop() {
+	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second) // context.Background() is already Done()
+	defer cancel()
+	if err := e.srv.Shutdown(ctx); err != nil {
+		logrus.WithError(err).Info("HTTP Server Shutdown")
+	}
+}
+
+// get status of the controller
+func Status(c *gin.Context) {
+	status := healthcheck.Status{
+		Ready: true,
+	}
+	c.Header("Cache-Control", "no-cache")
+	c.JSON(http.StatusOK, status)
+}

internal/app/setup.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
 // SPDX-License-Identifier: MIT
+
 package app
 
 import (
@@ -11,15 +12,19 @@ import (
 )
 
 type Setup struct {
-	config *config.UEConfig
+	config           *config.UEConfig
+	httpServerEntity *HttpServerEntity
 }
 
 func NewSetup(config *config.UEConfig) *Setup {
 	return &Setup{
-		config: config,
+		config:           config,
+		httpServerEntity: NewHttpServerEntity(config.Control.BindAddr),
 	}
 }
+
 func (s *Setup) Init(ctx context.Context) error {
+	s.httpServerEntity.Start()
 	return nil
 }
 
@@ -35,5 +40,6 @@ func (s *Setup) Run(ctx context.Context) error {
 }
 
 func (s *Setup) Exit() error {
+	s.httpServerEntity.Stop()
 	return nil
 }

internal/config/config.go

@@ -2,12 +2,15 @@
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
 // SPDX-License-Identifier: MIT
+
 package config
 
 import (
 	"io/ioutil"
 	"path/filepath"
 
+	"github.com/nextmn/json-api/jsonapi"
+
 	"gopkg.in/yaml.v3"
 )
 
@@ -29,5 +32,11 @@ func ParseConf(file string) (*UEConfig, error) {
 }
 
 type UEConfig struct {
-	Logger *Logger `yaml:"logger,omitempty"`
+	Control Control `yaml:"control"`
+	Logger  *Logger `yaml:"logger,omitempty"`
+}
+
+type Control struct {
+	Uri      jsonapi.ControlURI `yaml:"uri"`       // may contain domain name instead of ip address
+	BindAddr string             `yaml:"bind-addr"` // in the form `ip` or `ip:port` (with default port being 80)
 }

internal/config/logger.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
 // SPDX-License-Identifier: MIT
+
 package config
 
 import "github.com/sirupsen/logrus"

main.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT-style license that can be
 // found in the LICENSE file.
 // SPDX-License-Identifier: MIT
+
 package main
 
 import (
@@ -10,6 +11,7 @@ import (
 	"os/signal"
 	"syscall"
 
+	"github.com/nextmn/json-api/healthcheck"
 	"github.com/nextmn/logrus-formatter/logger"
 
 	"github.com/nextmn/ue-lite/internal/app"
@@ -41,7 +43,7 @@ func main() {
 				EnvVars:     []string{"CONFIG_FILE"},
 			},
 		},
-		Action: func(ctx *cli.Context) error {
+		Before: func(ctx *cli.Context) error {
 			if ctx.Path("config") == "" {
 				if xdgPath, err := xdg.SearchConfigFile("nextmn-ue-lite/config.yaml"); err != nil {
 					cli.ShowAppHelp(ctx)
@@ -50,19 +52,40 @@ func main() {
 					ctx.Set("config", xdgPath)
 				}
 			}
+			return nil
+		},
+		Action: func(ctx *cli.Context) error {
 			conf, err := config.ParseConf(ctx.Path("config"))
 			if err != nil {
 				logrus.WithContext(ctx.Context).WithError(err).Fatal("Error loading config, exiting…")
 			}
 			if conf.Logger != nil {
 				logrus.SetLevel(conf.Logger.Level)
 			}
-
 			if err := app.NewSetup(conf).Run(ctx.Context); err != nil {
 				logrus.WithError(err).Fatal("Error while running, exiting…")
 			}
 			return nil
 		},
+		Commands: []*cli.Command{
+			{
+				Name:  "healthcheck",
+				Usage: "check status of the node",
+				Action: func(ctx *cli.Context) error {
+					conf, err := config.ParseConf(ctx.Path("config"))
+					if err != nil {
+						logrus.WithContext(ctx.Context).WithError(err).Fatal("Error loading config, exiting…")
+					}
+					if conf.Logger != nil {
+						logrus.SetLevel(conf.Logger.Level)
+					}
+					if err := healthcheck.NewHealthcheck(*conf.Control.Uri.JoinPath("status"), "go-github-nextmn-ue-lite").Run(ctx.Context); err != nil {
+						os.Exit(1)
+					}
+					return nil
+				},
+			},
+		},
 	}
 	if err := app.RunContext(ctx, os.Args); err != nil {
 		logrus.Fatal(err)