├── docker-compose.yaml ├── order-service ├── Dockerfile ├── go.mod ├── go.sum └── main.go └── payment-service ├── .env ├── .gitignore ├── Dockerfile ├── go.mod ├── go.sum └── main.go /docker-compose.yaml: -------------------------------------------------------------------------------- 1 | version: '3.9' 2 | services: 3 | order: 4 | build: order-service 5 | # image: imrenagi/order-service:latest 6 | environment: 7 | PAYMENT_SERVICE_HOST: "payment:8080" 8 | ports: 9 | - "80:8081" 10 | depends_on: 11 | - payment 12 | payment: 13 | build: payment-service 14 | # image: imrenagi/payment-service:v1 15 | environment: 16 | POSTGRES_HOST: postgres 17 | POSTGRES_DB: payment 18 | POSTGRES_USER: payment 19 | POSTGRES_PASSWORD: payment 20 | COUNTRY_CODE: id 21 | # ports: 22 | # - "8080:8080" 23 | depends_on: 24 | - postgres 25 | restart: always 26 | postgres: 27 | image: postgres:13-alpine 28 | environment: 29 | POSTGRES_DB: payment 30 | POSTGRES_USER: payment 31 | POSTGRES_PASSWORD: payment 32 | # expose: 33 | # - "5432" 34 | # ports: 35 | # - "5432:5432" 36 | restart: always -------------------------------------------------------------------------------- /order-service/Dockerfile: -------------------------------------------------------------------------------- 1 | ############################ 2 | # STEP 1 build executable binary 3 | ############################ 4 | FROM golang:alpine AS builder 5 | RUN apk update && apk add --no-cache git 6 | WORKDIR /app 7 | COPY . . 8 | RUN go build -o order-service 9 | 10 | ############################ 11 | # STEP 2 build a small image 12 | ############################ 13 | FROM alpine 14 | WORKDIR /app 15 | COPY --from=builder /app/order-service /app 16 | CMD ["./order-service"] -------------------------------------------------------------------------------- /order-service/go.mod: -------------------------------------------------------------------------------- 1 | module github.com/imrenagi/microservice-demo/order-service 2 | 3 | go 1.15 4 | 5 | require ( 6 | github.com/google/uuid v1.2.0 7 | ) 8 | -------------------------------------------------------------------------------- /order-service/go.sum: -------------------------------------------------------------------------------- 1 | github.com/google/uuid v1.2.0 h1:qJYtXnJRWmpe7m/3XlyhrsLrEURqHRM2kxzoxXqyUDs= 2 | github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= 3 | github.com/xtgo/uuid v0.0.0-20140804021211-a0b114877d4c h1:3lbZUMbMiGUW/LMkfsEABsc5zNT9+b1CvsJx47JzJ8g= 4 | github.com/xtgo/uuid v0.0.0-20140804021211-a0b114877d4c/go.mod h1:UrdRz5enIKZ63MEE3IF9l2/ebyx59GyGgPi+tICQdmM= 5 | -------------------------------------------------------------------------------- /order-service/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "encoding/json" 5 | "fmt" 6 | "log" 7 | "net/http" 8 | "os" 9 | "time" 10 | 11 | "github.com/google/uuid" 12 | ) 13 | 14 | func main() { 15 | http.HandleFunc("/order", Order()) 16 | log.Fatal(http.ListenAndServe(":8081", nil)) 17 | } 18 | 19 | func Order() http.HandlerFunc { 20 | return func(w http.ResponseWriter, r *http.Request) { 21 | 22 | baseURL := fmt.Sprintf("http://%s", os.Getenv("PAYMENT_SERVICE_HOST")) 23 | res, err := http.Post(baseURL+"/payments/id/api/v1/", "application/json", nil) 24 | if err != nil { 25 | http.Error(w, err.Error(), http.StatusInternalServerError) 26 | return 27 | } 28 | 29 | dec := json.NewDecoder(res.Body) 30 | 31 | var p PaymentResponse 32 | err = dec.Decode(&p) 33 | if err != nil { 34 | http.Error(w, err.Error(), http.StatusInternalServerError) 35 | return 36 | } 37 | 38 | w.Write([]byte(fmt.Sprintf("merchant %s received payment %f USD", p.MerchantID, p.Value))) 39 | } 40 | } 41 | 42 | type PaymentResponse struct { 43 | CreatedAt time.Time `json:"created_at"` 44 | UpdatedAt time.Time `json:"updated_at"` 45 | ID uuid.UUID `gorm:"type:uuid;not null" json:"id"` 46 | Value float64 `gorm:"type:float" json:"value"` 47 | MerchantID uuid.UUID `gorm:"type:uuid;not null" json:"merchant_id"` 48 | Region string `gorm:"type:text" json:"region"` 49 | } 50 | -------------------------------------------------------------------------------- /payment-service/.env: -------------------------------------------------------------------------------- 1 | export POSTGRES_HOST=localhost 2 | export POSTGRES_DB=payment 3 | export POSTGRES_USER=payment 4 | export POSTGRES_PASSWORD=payment 5 | export COUNTRY_CODE=id -------------------------------------------------------------------------------- /payment-service/.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | .idea 8 | 9 | # Test binary, built with `go test -c` 10 | *.test 11 | 12 | # Output of the go coverage tool, specifically when used with LiteIDE 13 | *.out 14 | 15 | # Dependency directories (remove the comment below to include it) 16 | # vendor/ -------------------------------------------------------------------------------- /payment-service/Dockerfile: -------------------------------------------------------------------------------- 1 | ############################ 2 | # STEP 1 build executable binary 3 | ############################ 4 | FROM golang:alpine AS builder 5 | RUN apk update && apk add --no-cache git 6 | WORKDIR /app 7 | COPY . . 8 | RUN go build -o payment-service 9 | 10 | ############################ 11 | # STEP 2 build a small image 12 | ############################ 13 | FROM alpine 14 | WORKDIR /app 15 | COPY --from=builder /app/payment-service /app 16 | 17 | CMD ["./payment-service"] -------------------------------------------------------------------------------- /payment-service/go.mod: -------------------------------------------------------------------------------- 1 | module github.com/imrenagi/cloudrun-demo/multi-region 2 | 3 | go 1.15 4 | 5 | require ( 6 | github.com/google/uuid v1.2.0 7 | github.com/gorilla/mux v1.8.0 8 | github.com/rs/zerolog v1.20.0 9 | gorm.io/driver/postgres v1.0.8 10 | gorm.io/gorm v1.21.3 11 | gorm.io/plugin/dbresolver v1.1.0 12 | ) 13 | -------------------------------------------------------------------------------- /payment-service/go.sum: -------------------------------------------------------------------------------- 1 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 2 | github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ= 3 | github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= 4 | github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= 5 | github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY= 6 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 7 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 8 | github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg= 9 | github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= 10 | github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM= 11 | github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI= 12 | github.com/google/uuid v1.2.0 h1:qJYtXnJRWmpe7m/3XlyhrsLrEURqHRM2kxzoxXqyUDs= 13 | github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= 14 | github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI= 15 | github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So= 16 | github.com/jackc/chunkreader v1.0.0 h1:4s39bBR8ByfqH+DKm8rQA3E1LHZWB9XWcrz8fqaZbe0= 17 | github.com/jackc/chunkreader 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github.com/rs/zerolog v1.15.0/go.mod h1:xYTKnLHcpfU2225ny5qZjxnj9NvkumZYjJHlAThCjNc= 96 | github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs= 97 | github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo= 98 | github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0= 99 | github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4= 100 | github.com/shopspring/decimal v0.0.0-20200227202807-02e2044944cc/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o= 101 | github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q= 102 | github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE= 103 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 104 | github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 105 | github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE= 106 | github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= 107 | github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI= 108 | github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4= 109 | github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA= 110 | github.com/zenazn/goji v0.9.0/go.mod h1:7S9M489iMyHBNxwZnk9/EHS098H4/F6TATF2mIxtB1Q= 111 | go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE= 112 | go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE= 113 | go.uber.org/atomic v1.6.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ= 114 | go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0= 115 | go.uber.org/multierr v1.5.0/go.mod h1:FeouvMocqHpRaaGuG9EjoKcStLC43Zu/fmqdUMPcKYU= 116 | go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA= 117 | go.uber.org/zap v1.9.1/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q= 118 | go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q= 119 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 120 | golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE= 121 | golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 122 | golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 123 | golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 124 | golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= 125 | golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI= 126 | golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= 127 | golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc= 128 | golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc= 129 | golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 130 | golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 131 | golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 132 | golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 133 | golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 134 | golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 135 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 136 | golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 137 | golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 138 | golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 139 | golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 140 | golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 141 | golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 142 | golang.org/x/sys 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152 | golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 153 | golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 154 | golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 155 | golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 156 | golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 157 | golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 158 | golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 159 | golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4= 160 | golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 161 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 162 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 163 | gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= 164 | gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s= 165 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 166 | gorm.io/driver/mysql v1.0.3/go.mod h1:twGxftLBlFgNVNakL7F+P/x9oYqoymG3YYT8cAfI9oI= 167 | gorm.io/driver/postgres v1.0.8 h1:PAgM+PaHOSAeroTjHkCHCBIHHoBIf9RgPWGo8dF2DA8= 168 | gorm.io/driver/postgres v1.0.8/go.mod h1:4eOzrI1MUfm6ObJU/UcmbXyiHSs8jSwH95G5P5dxcAg= 169 | gorm.io/gorm v1.20.4/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw= 170 | gorm.io/gorm v1.20.11/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw= 171 | gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw= 172 | gorm.io/gorm v1.21.3 h1:qDFi55ZOsjZTwk5eN+uhAmHi8GysJ/qCTichM/yO7ME= 173 | gorm.io/gorm v1.21.3/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw= 174 | gorm.io/plugin/dbresolver v1.1.0 h1:cegr4DeprR6SkLIQlKhJLYxH8muFbJ4SmnojXvoeb00= 175 | gorm.io/plugin/dbresolver v1.1.0/go.mod h1:tpImigFAEejCALOttyhWqsy4vfa2Uh/vAUVnL5IRF7Y= 176 | honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= 177 | -------------------------------------------------------------------------------- /payment-service/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "encoding/json" 6 | "fmt" 7 | "io/ioutil" 8 | "net" 9 | "net/http" 10 | "os" 11 | "strings" 12 | "time" 13 | 14 | "github.com/google/uuid" 15 | "gorm.io/driver/postgres" 16 | "gorm.io/gorm" 17 | "gorm.io/plugin/dbresolver" 18 | 19 | "github.com/gorilla/mux" 20 | "github.com/rs/zerolog/log" 21 | ) 22 | 23 | type resp struct { 24 | UUID string `json:"uuid"` 25 | } 26 | 27 | func main() { 28 | 29 | dsn := fmt.Sprintf("host=%s port=%s user=%s DB.name=%s password=%s sslmode=disable", 30 | os.Getenv("POSTGRES_HOST"), 31 | "5432", 32 | os.Getenv("POSTGRES_USER"), 33 | os.Getenv("POSTGRES_DB"), 34 | os.Getenv("POSTGRES_PASSWORD")) 35 | log.Debug().Msg(dsn) 36 | gormDB, err := gorm.Open(postgres.New(postgres.Config{DSN: dsn}), &gorm.Config{}) 37 | if err != nil { 38 | log.Fatal().Err(err).Msg("unable to create db connection") 39 | } 40 | 41 | replicaIPAddresses := os.Getenv("POSTGRES_REPLICA_IPS") 42 | ips := strings.Split(replicaIPAddresses, ",") 43 | 44 | err = gormDB.AutoMigrate(&Payment{}) 45 | 46 | var dialectors []gorm.Dialector 47 | for _, ip := range ips { 48 | 49 | ip = strings.TrimSpace(ip) 50 | if ip == "" { 51 | continue 52 | } 53 | 54 | rdsn := fmt.Sprintf("host=%s port=%s user=%s DB.name=%s password=%s sslmode=disable", ip, "5432", os.Getenv("POSTGRES_USER"), os.Getenv("POSTGRES_DB"), os.Getenv("POSTGRES_PASSWORD")) 55 | config := postgres.Config{ 56 | DSN: rdsn, 57 | } 58 | dialectors = append(dialectors, postgres.New(config)) 59 | } 60 | 61 | if len(ips) > 0 { 62 | err := gormDB.Use(dbresolver.Register(dbresolver.Config{ 63 | Replicas: dialectors, 64 | Policy: dbresolver.RandomPolicy{}, 65 | }), 66 | ) 67 | if err != nil { 68 | log.Fatal().Err(err).Msg("unable to setup gorm plugin") 69 | } 70 | log.Debug().Msg("replicas are registered") 71 | } 72 | 73 | router := mux.NewRouter() 74 | srv := &Server{ 75 | Router: router, 76 | db: gormDB, 77 | } 78 | 79 | srv.routesV1() 80 | 81 | srv.Run(context.Background(), 8080) 82 | } 83 | 84 | // Server ... 85 | type Server struct { 86 | Router *mux.Router 87 | stopCh chan struct{} 88 | 89 | db *gorm.DB 90 | } 91 | 92 | // Run ... 93 | func (g *Server) Run(ctx context.Context, port int) { 94 | 95 | httpS := http.Server{ 96 | Addr: fmt.Sprintf(":%d", port), 97 | Handler: g.Router, 98 | } 99 | 100 | // Start listener 101 | conn, err := net.Listen("tcp", fmt.Sprintf(":%d", port)) 102 | if err != nil { 103 | log.Fatal().Err(err).Msgf("failed listen") 104 | } 105 | 106 | log.Info().Msgf("payment service serving on port %d ", port) 107 | 108 | go func() { g.checkServeErr("httpS", httpS.Serve(conn)) }() 109 | 110 | g.stopCh = make(chan struct{}) 111 | <-g.stopCh 112 | if err := conn.Close(); err != nil { 113 | panic(err) 114 | } 115 | } 116 | 117 | // checkServeErr checks the error from a .Serve() call to decide if it was a graceful shutdown 118 | func (g *Server) checkServeErr(name string, err error) { 119 | if err != nil { 120 | if g.stopCh == nil { 121 | // a nil stopCh indicates a graceful shutdown 122 | log.Info().Msgf("graceful shutdown %s: %v", name, err) 123 | } else { 124 | log.Fatal().Msgf("%s: %v", name, err) 125 | } 126 | } else { 127 | log.Info().Msgf("graceful shutdown %s", name) 128 | } 129 | } 130 | 131 | func (g *Server) routesV1() { 132 | 133 | g.Router.HandleFunc("/", hcHandler()) 134 | 135 | // serve api 136 | api := g.Router.PathPrefix(fmt.Sprintf("/payments/%s/api/v1/", os.Getenv("COUNTRY_CODE"))).Subrouter() 137 | api.HandleFunc("/", listPayment(g.db)).Methods("GET") 138 | api.HandleFunc("/", createPayment(g.db)).Methods("POST") 139 | } 140 | 141 | func region() ([]byte, error) { 142 | 143 | req, err := http.NewRequest(http.MethodGet, "http://metadata.google.internal/computeMetadata/v1/instance/region", nil) 144 | if err != nil { 145 | return nil, err 146 | } 147 | 148 | req.Header.Set("Metadata-Flavor", "Google") 149 | httpRes, err := http.DefaultClient.Do(req) 150 | if err != nil { 151 | return nil, err 152 | } 153 | 154 | bodyBytes, err := ioutil.ReadAll(httpRes.Body) 155 | if err != nil { 156 | return nil, nil 157 | } 158 | 159 | return bodyBytes, nil 160 | } 161 | 162 | func hcHandler() http.HandlerFunc { 163 | return func(rw http.ResponseWriter, r *http.Request) { 164 | region, err := region() 165 | if err != nil { 166 | rw.Write([]byte(err.Error())) 167 | return 168 | } 169 | rw.Write(region) 170 | } 171 | } 172 | 173 | func listPayment(db *gorm.DB) http.HandlerFunc { 174 | return func(rw http.ResponseWriter, r *http.Request) { 175 | 176 | if os.Getenv("FAIL") == "true" { 177 | rw.WriteHeader(http.StatusInternalServerError) 178 | rw.Write([]byte("failed to handle the request")) 179 | return 180 | } 181 | 182 | var payments []Payment 183 | err := db.WithContext(r.Context()).Order("created_at desc"). 184 | Limit(20). 185 | Find(&payments).Error 186 | if err != nil { 187 | rw.WriteHeader(http.StatusInternalServerError) 188 | rw.Write([]byte(err.Error())) 189 | return 190 | } 191 | 192 | bytes, err := json.Marshal(payments) 193 | if err != nil { 194 | rw.WriteHeader(http.StatusInternalServerError) 195 | rw.Write([]byte(err.Error())) 196 | return 197 | } 198 | 199 | rw.Header().Set("Content-Type", "application/json") 200 | rw.Write(bytes) 201 | } 202 | } 203 | 204 | type Payment struct { 205 | CreatedAt time.Time `json:"created_at"` 206 | UpdatedAt time.Time `json:"updated_at"` 207 | ID uuid.UUID `gorm:"type:uuid;not null" json:"id"` 208 | Value float64 `gorm:"type:float" json:"value"` 209 | MerchantID uuid.UUID `gorm:"type:uuid;not null" json:"merchant_id"` 210 | Region string `gorm:"type:text" json:"region"` 211 | } 212 | 213 | func (p *Payment) BeforeCreate(tx *gorm.DB) (err error) { 214 | uid, err := uuid.NewRandom() 215 | if err != nil { 216 | return err 217 | } 218 | p.ID = uid 219 | return nil 220 | } 221 | 222 | func createPayment(db *gorm.DB) http.HandlerFunc { 223 | return func(rw http.ResponseWriter, r *http.Request) { 224 | 225 | if os.Getenv("FAIL") == "true" { 226 | rw.WriteHeader(http.StatusInternalServerError) 227 | rw.Write([]byte("failed to handle the request")) 228 | return 229 | } 230 | 231 | region, err := region() 232 | if err != nil { 233 | region = []byte(`12345`) 234 | } 235 | 236 | payment := &Payment{ 237 | ID: uuid.New(), 238 | Value: 1000, 239 | MerchantID: uuid.New(), 240 | Region: string(region), 241 | } 242 | 243 | err = db.WithContext(r.Context()).Save(payment).Error 244 | if err != nil { 245 | rw.WriteHeader(http.StatusInternalServerError) 246 | rw.Write([]byte(err.Error())) 247 | return 248 | } 249 | 250 | bytes, err := json.Marshal(payment) 251 | if err != nil { 252 | rw.WriteHeader(http.StatusInternalServerError) 253 | rw.Write([]byte(err.Error())) 254 | return 255 | } 256 | 257 | rw.Header().Set("Content-Type", "application/json") 258 | rw.Write(bytes) 259 | } 260 | } 261 | --------------------------------------------------------------------------------