Skeleton of Google Cloud Function with wire

go.mod

module somewhere.else/playgrounds/ping

go 1.17

require github.com/google/wire v0.5.0

go.sum

github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/google/subcommands v1.0.1/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk=
github.com/google/wire v0.5.0 h1:I7ELFeVBr3yfPIcc8+MWvrjk+3VjbcSzoXm3JVa+jD8=
github.com/google/wire v0.5.0/go.mod h1:ngWDr9Qvq3yZA10YrxfyGELY/AFWGVpy9c1LTRi1EoU=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190422233926-fe54fb35175b/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=

Makefile

.PHONY: build
build:
	@echo "Nothing to build"

.PHONY: deploy
deploy: deploy/Ping

.PHONY: deploy/Ping
deploy/Ping:
	gcloud functions deploy Ping \
		--region asia-northeast1 \
		--runtime go116 \
		--trigger-http

model.go

package ping

type Model struct {
	welcomeMessage string
}

func NewModel() Model {
	return Model{
		welcomeMessage: "Hello World",
	}
}

run.go

package ping

import (
	"encoding/json"
	"net/http"
)

type response struct {
	Message string `json:"message,omitempty"`
}

var Ping = func() func(http.ResponseWriter, *http.Request) {
	deps := getDeps()
	return func(w http.ResponseWriter, _ *http.Request) {
		resp := response{deps.model.welcomeMessage}
		_ = json.NewEncoder(w).Encode(resp)
	}
}()

wire.go

//go:generate wire
//go:build wireinject
// +build wireinject

package ping

import "github.com/google/wire"

type Deps struct {
	model Model
}

var modelSet = wire.NewSet(
	NewModel,
	wire.Struct(new(Deps), "model"),
)

func getDeps() *Deps {
	wire.Build(modelSet)
	return &Deps{}
}

wire_gen.go

// Code generated by Wire. DO NOT EDIT.

//go:generate go run github.com/google/wire/cmd/wire
//+build !wireinject

package ping

import (
	"github.com/google/wire"
)

// Injectors from wire.go:

func getDeps() *Deps {
	model := NewModel()
	deps := &Deps{
		model: model,
	}
	return deps
}

// wire.go:

type Deps struct {
	model Model
}

var modelSet = wire.NewSet(
	NewModel, wire.Struct(new(Deps), "model"),
)