feat: add first poc for a Kafka proxy (#7)

.gitignore

@@ -8,8 +8,11 @@
 # Test binary, built with `go test -c`
 *.test
 
-# Output of the go coverage tool, specifically when used with LiteIDE
-*.out
+# Output of the go coverage tool
+*.cov
 
 # Dependency directories (remove the comment below to include it)
-# vendor/
+vendor/
+
+# Binaries of any kind
+bin/

.golangci.yml

@@ -0,0 +1,47 @@
+linters:
+  disable-all: true
+  enable:
+    - bodyclose
+    - deadcode
+    - depguard
+    - dogsled
+    - dupl
+    - errcheck
+    - errorlint
+    - exportloopref
+    - exhaustive
+    - forbidigo
+    - funlen
+    - gochecknoinits
+    - goconst
+    - gocritic
+    - gocyclo
+    - godot
+    - gofumpt
+    - goimports
+    - revive
+    - goprintffuncname
+    - gosec
+    - gosimple
+    - govet
+    - ifshort
+    - ineffassign
+    - misspell
+    - nakedret
+    - noctx
+    - nolintlint
+    - rowserrcheck
+    - staticcheck
+    - structcheck
+    - stylecheck
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - varcheck
+    - whitespace
+
+linters-settings:
+  forbidigo:
+    forbid:
+      - fmt.Print.* # usually just used for debugging purpose

Dockerfile

@@ -0,0 +1,12 @@
+FROM golang:1.16
+
+WORKDIR /go/src/app
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+COPY . .
+RUN make build
+
+EXPOSE 28002
+ENTRYPOINT ["./bin/out/app"]

Makefile

@@ -0,0 +1,57 @@
+# Makefile based on https://gist.github.com/thomaspoignant/5b72d579bd5f311904d973652180c705
+
+GOCMD=go
+GOTEST=$(GOCMD) test
+PROJECT_NAME := $(shell basename "$(PWD)")
+BINARY_NAME?=$(PROJECT_NAME)
+BIN_DIR?=bin
+TOOLS_DIR?=bin/tools
+
+GREEN  := $(shell tput -Txterm setaf 2)
+YELLOW := $(shell tput -Txterm setaf 3)
+WHITE  := $(shell tput -Txterm setaf 7)
+CYAN   := $(shell tput -Txterm setaf 6)
+RESET  := $(shell tput -Txterm sgr0)
+
+GOLANGCILINT_VERSION = 1.40.1
+
+.PHONY: all test build vendor
+
+all: help
+
+## Build:
+build: ## Build your project and put the output binary in bin/out
+	mkdir -p $(BIN_DIR)
+	$(GOCMD) build -o bin/out/$(BINARY_NAME) .
+
+## Linting:
+lint: $(TOOLS_DIR)/golangci-lint ## Run linters
+	$(TOOLS_DIR)/golangci-lint run
+
+## Test:
+test: ## Run the tests of the project
+	$(GOTEST) -v -race ./...
+
+coverage: ## Run the tests of the project and export the coverage
+	$(GOTEST) -cover -covermode=count -coverprofile=profile.cov ./...
+	$(GOCMD) tool cover -func profile.cov
+
+## Help:
+help: ## Show this help.
+	@echo ''
+	@echo 'Usage:'
+	@echo '  ${YELLOW}make${RESET} ${GREEN}<target>${RESET}'
+	@echo ''
+	@echo 'Targets:'
+	@awk 'BEGIN {FS = ":.*?## "} { \
+		if (/^[a-zA-Z_-]+:.*?##.*$$/) {printf "    ${YELLOW}%-20s${GREEN}%s${RESET}\n", $$1, $$2} \
+		else if (/^## .*$$/) {printf "  ${CYAN}%s${RESET}\n", substr($$1,4)} \
+		}' $(MAKEFILE_LIST)
+$(BIN_DIR):
+	mkdir -p $(BIN_DIR)
+
+$(TOOLS_DIR):
+	mkdir -p $(TOOLS_DIR)
+
+$(TOOLS_DIR)/golangci-lint: $(TOOLS_DIR)
+	@wget -O - -q https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | BINDIR=$(@D) sh -s v$(GOLANGCILINT_VERSION) > /dev/null 2>&1

docker-compose.yml

@@ -0,0 +1,40 @@
+---
+version: "3.5"
+
+services:
+  zookeeper:
+    image: confluentinc/cp-zookeeper:latest
+    hostname: zookeeper
+    container_name: zookeeper
+    environment:
+      ZOOKEEPER_CLIENT_PORT: 2181
+
+  broker:
+    image: confluentinc/cp-kafka:latest
+    hostname: broker
+    container_name: broker
+    depends_on:
+      - zookeeper
+    ports:
+      - "9092:9092" # external connection
+    environment:
+      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker:29092,PLAINTEXT_HOST://localhost:9092
+      KAFKA_BROKER_ID: 1
+      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
+      KAFKA_LOG4J_ROOT_LOGLEVEL: ERROR
+      KAFKA_LOG4J_LOGGERS: 'KafkaRequestHandler=TRACE,kafka.server.KafkaApis=TRACE,kafka.log.Log=TRACE,kafka.network.RequestChannel=TRACE,kafka.network.Processor=TRACE'
+
+  proxy:
+    hostname: proxy
+    container_name: proxy
+    build:
+      context: .
+      dockerfile: Dockerfile
+    environment:
+      EVENTGATEWAY_KAFKA_PROXY_BROKERS_MAPPING: 'localhost:9092,proxy:28002'
+      EVENTGATEWAY_KAFKA_PROXY_BROKERS_DIAL_MAPPING: 'localhost:9092,broker:9092'
+      EVENTGATEWAY_DEBUG: 'true'
+    depends_on:
+      - broker

go.mod

@@ -0,0 +1,25 @@
+module github.com/asyncapi/event-gateway
+
+go 1.16
+
+require (
+	github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21
+	github.com/frankban/quicktest v1.11.3 // indirect
+	github.com/grepplabs/kafka-proxy v0.2.8
+	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/klauspost/compress v1.12.2
+	github.com/kr/text v0.2.0 // indirect
+	github.com/pierrec/lz4 v2.6.0+incompatible
+	github.com/pkg/errors v0.9.1
+	github.com/sirupsen/logrus v1.8.1
+	github.com/stretchr/testify v1.7.0 // indirect
+	github.com/xdg/scram v1.0.3 // indirect
+	github.com/xdg/stringprep v1.0.3 // indirect
+	golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b // indirect
+	golang.org/x/net v0.0.0-20210427231257-85d9c07bbe3a // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+)
+
+replace github.com/grepplabs/kafka-proxy => github.com/smoya/kafka-proxy v0.2.9-0.20210623125118-a94cf71a065c