Frontend

.dockerignore

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+vendor/

Dockerfile

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+# Copyright 2020 Google LLC
+#
+# 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.
+
+FROM golang:1.20.4-alpine@sha256:0a03b591c358a0bb02e39b93c30e955358dadd18dc507087a3b7f3912c17fe13 as builder
+RUN apk add --no-cache ca-certificates git
+RUN apk add build-base
+WORKDIR /src
+
+# restore dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+
+# Skaffold passes in debug-oriented compiler flags
+ARG SKAFFOLD_GO_GCFLAGS
+RUN go build -gcflags="${SKAFFOLD_GO_GCFLAGS}" -o /go/bin/frontend .
+
+FROM alpine:3.18.0@sha256:02bb6f428431fbc2809c5d1b41eab5a68350194fb508869a33cb1af4444c9b11 as release
+RUN apk add --no-cache ca-certificates \
+    busybox-extras net-tools bind-tools
+WORKDIR /src
+COPY --from=builder /go/bin/frontend /src/server
+COPY ./templates ./templates
+COPY ./static ./static
+
+# Definition of this variable is used by 'skaffold debug' to identify a golang binary.
+# Default behavior - a failure prints a stack trace for the current goroutine.
+# See https://golang.org/pkg/runtime/
+ENV GOTRACEBACK=single
+
+EXPOSE 8080
+ENTRYPOINT ["/src/server"]

Jenkinsfile

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+pipeline {
+    agent any
+
+    stages {
+        stage('Build & Tag Docker Image') {
+            steps {
+                script {
+                    withDockerRegistry(credentialsId: 'docker-cred', toolName: 'docker') {
+                        sh "docker build -t abhishek0768/frontend:latest ."
+                    }
+                }
+            }
+        }
+
+        stage('Push Docker Image') {
+            steps {
+                script {
+                    withDockerRegistry(credentialsId: 'docker-cred', toolName: 'docker') {
+                        sh "docker push abhishek0768/frontend:latest"
+                    }
+                }
+            }
+        }
+    }
+}

README.md

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+# frontend
+
+Run the following command to restore dependencies to `vendor/` directory:
+
+    dep ensure --vendor-only

deployment_details.go

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+package main
+
+import (
+	"net/http"
+	"os"
+	"time"
+
+	"cloud.google.com/go/compute/metadata"
+	"github.com/sirupsen/logrus"
+)
+
+var deploymentDetailsMap map[string]string
+var log *logrus.Logger
+
+func init() {
+	initializeLogger()
+	// Use a goroutine to ensure loadDeploymentDetails()'s GCP API
+	// calls don't block non-GCP deployments. See issue #685.
+	go loadDeploymentDetails()
+}
+
+func initializeLogger() {
+	log = logrus.New()
+	log.Level = logrus.DebugLevel
+	log.Formatter = &logrus.JSONFormatter{
+		FieldMap: logrus.FieldMap{
+			logrus.FieldKeyTime:  "timestamp",
+			logrus.FieldKeyLevel: "severity",
+			logrus.FieldKeyMsg:   "message",
+		},
+		TimestampFormat: time.RFC3339Nano,
+	}
+	log.Out = os.Stdout
+}
+
+func loadDeploymentDetails() {
+	deploymentDetailsMap = make(map[string]string)
+	var metaServerClient = metadata.NewClient(&http.Client{})
+
+	podHostname, err := os.Hostname()
+	if err != nil {
+		log.Error("Failed to fetch the hostname for the Pod", err)
+	}
+
+	podCluster, err := metaServerClient.InstanceAttributeValue("cluster-name")
+	if err != nil {
+		log.Error("Failed to fetch the name of the cluster in which the pod is running", err)
+	}
+
+	podZone, err := metaServerClient.Zone()
+	if err != nil {
+		log.Error("Failed to fetch the Zone of the node where the pod is scheduled", err)
+	}
+
+	deploymentDetailsMap["HOSTNAME"] = podHostname
+	deploymentDetailsMap["CLUSTERNAME"] = podCluster
+	deploymentDetailsMap["ZONE"] = podZone
+
+	log.WithFields(logrus.Fields{
+		"cluster":  podCluster,
+		"zone":     podZone,
+		"hostname": podHostname,
+	}).Debug("Loaded deployment details")
+}

genproto.sh

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+#!/bin/bash -eu
+#
+# Copyright 2018 Google LLC
+#
+# 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.
+
+# [START gke_frontend_genproto]
+
+PATH=$PATH:$GOPATH/bin
+protodir=../../protos
+
+protoc --go_out=plugins=grpc:genproto -I $protodir $protodir/demo.proto
+
+# [END gke_frontend_genproto]