From cea1ae23ac0e27dc35a497f437b33053012a1a10 Mon Sep 17 00:00:00 2001
From: Marcus Noble <github@marcusnoble.co.uk>
Date: Sun, 8 Aug 2021 16:13:11 +0100
Subject: [PATCH] Initial commit

---
 Dockerfile | 13 ++++++++++++
 Makefile   | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 README.md  | 11 ++++++++++
 go.mod     |  3 +++
 main.go    | 54 +++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 142 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..6d6c394
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,13 @@
+FROM golang:1.16-alpine AS builder
+RUN apk update && apk add --no-cache git && apk add -U --no-cache ca-certificates
+WORKDIR /app/
+ADD go.mod ./
+RUN go mod download
+ADD . .
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags="-w -s" -o echoserver .
+
+FROM scratch
+WORKDIR /app/
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /app/echoserver /app/echoserver
+ENTRYPOINT ["/app/echoserver"]
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..13d5c71
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,61 @@
+.DEFAULT_GOAL := default
+
+IMAGE ?= docker.cluster.fun/averagemarcus/echoserver:latest
+
+.PHONY: test # Run all tests, linting and format checks
+test: lint check-format run-tests
+
+.PHONY: lint # Perform lint checks against code
+lint:
+	@go vet && golint -set_exit_status ./...
+
+.PHONY: check-format # Checks code formatting and returns a non-zero exit code if formatting errors found
+check-format:
+	@gofmt -e -l .
+
+.PHONY: format # Performs automatic format fixes on all code
+format:
+	@gofmt -s -w .
+
+.PHONY: run-tests # Runs all tests
+run-tests:
+	@echo "⚠️ 'run-tests' unimplemented"
+
+.PHONY: fetch-deps # Fetch all project dependencies
+fetch-deps:
+	@go mod tidy
+
+.PHONY: build # Build the project
+build: lint check-format fetch-deps
+	@go build -o echoserver main.go
+
+.PHONY: docker-build # Build the docker image
+docker-build:
+	@docker build -t $(IMAGE) .
+
+.PHONY: docker-publish # Push the docker image to the remote registry
+docker-publish:
+	@docker push $(IMAGE)
+
+.PHONY: run # Run the application
+run:
+	@go run .
+
+.PHONY: ci # Perform CI specific tasks to perform on a pull request
+ci:
+	@echo "⚠️ 'ci' unimplemented"
+
+.PHONY: release # Release the latest version of the application
+release:
+	@kubectl --namespace echoserver rollout restart deployment echoserver
+
+.PHONY: help # Show this list of commands
+help:
+	@echo "echoserver"
+	@echo "Usage: make [target]"
+	@echo ""
+	@echo "target	description" | expand -t20
+	@echo "-----------------------------------"
+	@grep '^.PHONY: .* #' Makefile | sed 's/\.PHONY: \(.*\) # \(.*\)/\1	\2/' | expand -t20
+
+default: test build
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ed27fb2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+# echoserver
+
+A basic HTTP server to echo back details of a request
+
+## Contributing
+
+If you find a bug or have an idea for a new feature please [raise an issue](issues/new) to discuss it.
+
+Pull requests are welcomed but please try and follow similar code style as the rest of the project and ensure all tests and code checkers are passing.
+
+Thank you 💛
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..70a3f40
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/averagemarcus/echoserver
+
+go 1.16
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..874e881
--- /dev/null
+++ b/main.go
@@ -0,0 +1,54 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"time"
+)
+
+type echoResponse struct {
+	RequestPath string              `json:"requestPath"`
+	RequestHost string              `json:"requestHost"`
+	Protocol    string              `json:"protocol"`
+	Method      string              `json:"method"`
+	Headers     map[string][]string `json:"headers"`
+	RemoteAddr  string              `json:"remoteAddr"`
+
+	ServerHostname string    `json:"serverHostname"`
+	ServerIP       string    `json:"serverIP"`
+	DateTime       time.Time `json:"dateTime"`
+}
+
+func main() {
+	hostname, _ := os.Hostname()
+	conn, _ := net.Dial("udp", "8.8.8.8:80")
+	defer conn.Close()
+	ipAddress := conn.LocalAddr().String()
+
+	http.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
+		resp := echoResponse{
+			RequestPath:    r.URL.String(),
+			RequestHost:    r.Host,
+			Protocol:       r.Proto,
+			Method:         r.Method,
+			Headers:        r.Header,
+			RemoteAddr:     r.RemoteAddr,
+			ServerHostname: hostname,
+			ServerIP:       ipAddress,
+			DateTime:       time.Now(),
+		}
+
+		b, _ := json.Marshal(resp)
+
+		rw.Header().Add("Content-Type", "application/json")
+		rw.Write(b)
+	})
+
+	err := http.ListenAndServe(":8080", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+}