Add /info route to return build info (#206)

Makefile

@@ -1,16 +1,19 @@
-.PHONY: build clean deploy remove test
-
+.PHONY: build
 build:
 	./script/build.sh
 
+.PHONY: clean
 clean:
 	rm -rf ./bin ./vendor
 
+.PHONY: deploy
 deploy: clean build
 	sls deploy --verbose
 
+.PHONY: remove
 remove: clean
 	sls remove --verbose
 
+.PHONY: test
 test:
 	go test -race -covermode=atomic ./...

api/info/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/aws/aws-lambda-go/events"
+	"github.com/aws/aws-lambda-go/lambda"
+	"github.com/harryzcy/mailbox/internal/util/apiutil"
+)
+
+var (
+	version   = "dev"
+	commit    = "n/a"
+	buildDate = "n/a"
+)
+
+func handler(ctx context.Context, req events.APIGatewayV2HTTPRequest) (apiutil.Response, error) {
+	body, err := json.Marshal(map[string]string{
+		"version": version,
+		"commit":  commit,
+		"build":   buildDate,
+	})
+	if err != nil {
+		fmt.Printf("marshal failed: %v\n", err)
+		return apiutil.NewErrorResponse(http.StatusInternalServerError, "internal error"), nil
+	}
+	return apiutil.NewSuccessJSONResponse(string(body)), nil
+}
+
+func main() {
+	lambda.Start(handler)
+}

script/build.sh

@@ -1,16 +1,31 @@
 #!/bin/bash
 
+BUILD_COMMIT=$(git rev-parse --short HEAD)
+BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+BUILD_VERSION=$(git describe --tags --always)
+
+ENVIRONMENT="env GOOS=linux GOARCH=amd64"
+
 apiFuncs=("list" "get" "getRaw" "getContent" "read" "trash" "untrash" "delete" "create" "save" "send")
 
 for i in "${!apiFuncs[@]}";
 do
   func="${apiFuncs[$i]}"
-  env GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o bin/api/emails/"${func}" api/emails/"${func}"/*
+  ${ENVIRONMENT} go build -ldflags="-s -w" -o bin/api/emails/"${func}" api/emails/"${func}"/*
   cp bin/api/emails/"${func}" bin/bootstrap
   zip -j bin/"${func}".zip bin/bootstrap
 done
 
-env GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o bin/functions/emailReceive functions/emailReceive/*
+${ENVIRONMENT} go build -ldflags="-s -w \
+                                  -X 'main.version=${BUILD_VERSION}' \
+                                  -X 'main.commit=${BUILD_COMMIT}' \
+                                  -X 'main.buildDate=${BUILD_DATE}' \
+                                  " \
+                        -o bin/api/info api/info/*
+cp bin/api/info bin/bootstrap
+zip -j bin/info.zip bin/bootstrap
+
+${ENVIRONMENT} go build -ldflags="-s -w" -o bin/functions/emailReceive functions/emailReceive/*
 cp bin/functions/emailReceive bin/bootstrap
 zip -j bin/emailReceive.zip bin/bootstrap
 rm bin/bootstrap

serverless.yml.example

@@ -184,6 +184,16 @@ functions:
             type: aws_iam
     package:
       artifact: bin/send.zip
+  info:
+    handler: bootstrap
+    events:
+      - httpApi:
+          method: GET
+          path: /info
+          authorizer:
+            type: aws_iam
+    package:
+      artifact: bin/info.zip
 
 resources:
   Resources: