Build MicroServices in Golang

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Build MicroServices in Golang Bo-Yi Wu 2016.08.21 1

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Bo-Yi Wu (appleboy) https://blog.wu-boy.com/ https://github.com/appleboy 2

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Agenda •  What are Microservices? •  Why Microservices? •  Golang Introduction •  Golang Testing Tool •  Golang Deployment 3

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What are Microservices? •  Fulfill only one task •  Application is a suite of small services and size •  Communicate with lightweight mechanisms, often REST •  Written in different programming languages •  Use different data storage technologies 4

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Why Microservices? •  Scaling Agility •  Migrating Legacy Applications •  Sustainable Development Speed •  Continuous Delivery •  Independent Scalability •  Technology Freedom 5

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Golang Introduction 6

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Who made this thing? 7 Robert Griesemer, Rob Pike and Ken Thompson

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Frequently Asked Questions https://golang.org/doc/faq 8

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Why Choose Golang •  Performance •  Multiple core •  Concurrency •  Compiled && portable •  Clean syntax •  Powerful standard library •  Strong type •  Open source 9

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Go, Open Source Do Less. Enable More. https://blog.golang.org/open-source 10

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Portable 11 https://github.com/mitchellh/gox

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13 https://talks.golang.org/2014/gocon-‐tokyo.slide

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14 https://talks.golang.org/2014/gocon-‐tokyo.slide

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companies using Go 15

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16 How We Moved Our API From Ruby to Go and Saved Our Sanity

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17 ScaleDrone Websocket 平台從 Node.js 轉換到 Golang

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18 HOW WE BUILT UBER ENGINEERING’S HIGHEST QUERY PER SECOND SERVICE USING GO

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Companies currently using Go throughout the world https://github.com/golang/go/wiki/GoUsers 19

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Farewell Node.js TJ Holowaychuk https://goo.gl/WVxwtb 20

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How to Write Go Code https://golang.org/doc/code.html 21

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Getting Started •  Workspaces •  GOPATH environment variable •  Import paths •  Your first program •  Your first library •  Package names •  Testing 22

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Workspaces •  Src – contains Go source files •  Pkg – contains package objects •  Bin – contains executable commands 23

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GOPATH Variable $ mkdir $HOME/work $ export GOPATH=$HOME/work $ export PATH=$PATH:$GOPATH/bin 25

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Import paths $ mkdir -p $GOPATH/src/github.com/user 26

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Your first program $ mkdir –p $GOPATH/src/github.com/user/hello $ touch $GOPATH/src/github.com/user/hello/hello.go 27

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Build and install package $ go install github.com/user/hello 29

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You will find hello binary $GOPATH/bin/hello $HOME/work/bin/hello 30

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Your first library $ mkdir $GOPATH/src/github.com/user/stringutil 31

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32 SWAP

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Tesing in Go $GOPATH/src/github.com/user/stringutil/ reverse_test.go 35

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Learn GoLang For Great Good Part: Unit Testing in Go https://goo.gl/WhAV5P 37

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38 Teamwork in http://aib.edu.au/blog/top-‐tips-‐eﬀective-‐teamwork/

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39 Code Commit Check Style Unit Testing Code Review Develop

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Effective Go https://golang.org/doc/effective_go.html 40

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Code Review Comments https://github.com/golang/go/wiki/CodeReviewComments 42

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Concurrency in go Go routines 43

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Go synchronization 46

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GOMAXPROCS maximum number of CPU 48

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49 sets the maximum number of CPUs

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Race Condition 50

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sync/Mutex 52

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sync/atomic 54

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Channel in go 56

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Command line in Go 58

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59 https://github.com/appleboy/gorush

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Build a MicroService 60

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•  Configuration –  Yaml, JSON or INI format •  Logger –  Access and error log format –  write file or output to console •  Web API –  JSON or XML format •  App and System status –  Memory, go version, uptime, response time … •  Deployment / Upgrades –  Docker image or binary file 61

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Configuration •  Yaml – https://github.com/go-gas/config •  INI – https://github.com/go-ini/ini •  JSON – https://github.com/spf13/viper 63

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Logger Structured, pluggable logging for Go. https://github.com/Sirupsen/logrus 64

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Build HTTP API Why You No Framework? https://goo.gl/ZlMtpN 65

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Web Framework •  Gin •  Echo •  Httprouter •  Mux •  Go-json-rest •  Gas 66

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Monitoring App Status 67

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Golang Testing Tool Just one command 70

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71 hello.go

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72 hello_test.go

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go test –v –cover 73

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To run only specific test go test –run xxxxx 75

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Tesing Coverage for go go test –coverprofile=covergae.out 76

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Viewing the results go tool cover –html=coverage.out 77

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linter for Go source code golint -set_exit_status package https://github.com/golang/lint 79

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Gofmt formats Go programs. go list ./... | grep -v vendor | xargs go fmt https://golang.org/cmd/gofmt/ 80

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81 + Testing Report Testing View

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Coverage Reporting https://github.com/axw/gocov https://github.com/AlekSi/gocov-xml 82

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Testing Reporting Convert go test output to junit xml https://github.com/jstemmer/go-junit-report 84

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Go Lint Reporting https://github.com/golang/lint 88

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Run test for multiple package? 91 +

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92 + Testing Report Testing View

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Docker image includes Golang coverage tools for testing https://github.com/appleboy/golang-testing 93

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Feature •  Convert go test output to junit xml •  Coverage testing tool •  XML (Cobertura) export •  Linter for Go source code •  Package Management for Golang •  Testing multiple Golang package 94

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Testing without Docker Download coverage script and copy to bin folder 95

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96 https://goo.gl/XpRfvp

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Run docker command 97 docker run --rm \ -v $(PWD):$PROJECT_PATH \ -w=$PROJECT_PATH \ appleboy/golang-testing \ sh -c ”make install && coverage all"

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Run docker-compose command https://goo.gl/0JMnlo 98

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docker-compose config docker-compose run golang-testing docker-compose down 99

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docker-compose.yml file https://goo.gl/0JMnlo 100

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Golang Dockerfile https://goo.gl/Vnt7Zc 102

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Output all report files 105 Xml and txt format

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Golang Deployment 107

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Build Go binary command 108

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Go build command 109 GOOS=linux \ GOARCH=amd64 \ CGO_ENABLED=0 \ go build \ -ldflags="-s -w -X main.Version=${v}" \ -o bin/hello go-hello

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110 Prepare golang Docker image Build go file Add bin file to Docker image Deploy image to Docker registry

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111 Prepare golang Docker image Build go file Add bin file to Docker image Deploy image to Docker registry

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112 Clone source Build binary file Tar binary file

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113 Clone source into docker

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114 Build binary file

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115 Tar binary file

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Prepare Docker Image docker build -t $(IMAGE) -f Dockerfile.build . 116

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117 Prepare golang Docker image Build go file Add bin file to Docker image Deploy image to Docker registry

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Output binary file docker run $(BUILD_IMAGE) > build.tar.gz 118

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119 Prepare golang Docker image Build go file Add bin file to Docker image Deploy image to Docker registry

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Prepare production image 120

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121 Untar binary file

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Build production image docker build –t hello-world -f Dockerfile.dist . 122

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Test your production image docker run -d -p 8088:8000 hello-world 123

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124 Prepare golang Docker image Build go file Add bin file to Docker image Deploy image to Docker registry docker push $(ACCOUNT)/$(IMAGE):$(tag)