build info

* API endpoint
* dockerfile adds commit hash and build time during build

.dockerignore

@@ -38,4 +38,3 @@ go.work
 oko-server
 *.sqlite*
 .vscode
-.git

Dockerfile

@@ -3,9 +3,9 @@ FROM alpine:3.15.0 AS build
 VOLUME ["/data"]
 COPY . /oko-server/git
 
-RUN apk add --no-cache go && \
+RUN apk add --no-cache go git && \
     cd /oko-server/git && \
-    go build
+    go build -ldflags "-X \"main.sha1ver=$(git rev-parse HEAD)\" -X \"main.buildTime=$(date -Iseconds)\""
 
 FROM alpine:3.15.0
 WORKDIR /oko-server

main.go

@@ -7,12 +7,18 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	"cernobor.cz/oko-server/models"
 	"cernobor.cz/oko-server/server"
 	"github.com/sirupsen/logrus"
 )
 
+var (
+	sha1ver   string
+	buildTime string
+)
+
 func main() {
 	tilepackFileArg := flag.String("tilepack", "", "File that will be sent to clients when they request a tile pack, also used to serve tiles in online mode. Required.")
 	portArg := flag.Int("port", 8080, "Port where the server will listen to. Default is 8080.")
@@ -31,7 +37,14 @@ func main() {
 		os.Exit(1)
 	}
 
+	t, err := time.Parse(time.RFC3339, buildTime)
+	if err != nil {
+		t = time.Now()
+	}
+
 	s := server.New(server.ServerConfig{
+		VersionHash:  sha1ver,
+		BuildTime:    &t,
 		Port:         *portArg,
 		DbPath:       *dbFileArg,
 		TilepackPath: *tilepackFileArg,

models/models.go

@@ -33,6 +33,11 @@ type Feature struct {
 	PhotoIDs []FeaturePhotoID `json:"photo_ids"`
 }
 
+type BuildInfo struct {
+	VersionHash string     `json:"version_hash"`
+	BuildTime   *time.Time `json:"build_time"`
+}
+
 // transport objects
 
 type Coords struct {

server/constants.go

@@ -2,6 +2,7 @@ package server
 
 const (
 	URIPing              = "/ping"
+	URIBuildInfo         = "/build-info"
 	URIHardFail          = "/hard-fail"
 	URISoftFail          = "/soft-fail"
 	URIReinit            = "/reinit"

server/handling.go

@@ -81,6 +81,12 @@ func (s *Server) setupRouter() *gin.Engine {
 	router.GET(URIPing, func(gc *gin.Context) {
 		gc.Status(http.StatusNoContent)
 	})
+	router.GET(URIBuildInfo, func(gc *gin.Context) {
+		gc.JSON(http.StatusOK, models.BuildInfo{
+			VersionHash: s.config.VersionHash,
+			BuildTime:   s.config.BuildTime,
+		})
+	})
 	router.GET(URIHardFail, func(gc *gin.Context) {
 		gc.Status(http.StatusNotImplemented)
 	})

server/server.go

@@ -35,6 +35,8 @@ type Server struct {
 }
 
 type ServerConfig struct {
+	VersionHash   string
+	BuildTime     *time.Time
 	Port          int
 	DbPath        string
 	TilepackPath  string