Example AWS lambda with slack api

aws/lambda/lambdaslackbot/.gitignore

@@ -0,0 +1,4 @@
+.terraform
+.terraform.lock.hcl
+terraform.tfstate*
+Makefile

aws/lambda/lambdaslackbot/Dockerfile

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+FROM public.ecr.aws/lambda/provided:al2 as build
+# install compiler
+RUN yum install -y golang
+RUN go env -w GOPROXY=direct
+# cache dependencies
+ADD go.mod go.sum ./
+RUN go mod download
+# build
+ADD . .
+RUN go build -o /main
+# copy artifacts to a clean image
+FROM public.ecr.aws/lambda/provided:al2
+COPY --from=build /main /main
+ENTRYPOINT [ "/main" ]           

aws/lambda/lambdaslackbot/Readme.md

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+# Build image
+
+1. Build & Push image
+
+```
+docker build -t 270431303334.dkr.ecr.ap-southeast-2.amazonaws.com/hello-world:latest .;
+aws ecr get-login-password --region ap-southeast-2 | docker login --username AWS --password-stdin 270431303334.dkr.ecr.ap-southeast-2.amazonaws.com;
+docker push 270431303334.dkr.ecr.ap-southeast-2.amazonaws.com/hello-world:latest;
+```
+
+2. Run terraform
+
+```
+terraform init;
+terraform apply;
+```
+
+3. Test
+
+```
+curl --location --request POST 'https://ssah8op3a5.execute-api.ap-southeast-2.amazonaws.com/default/FakeChimera' --header 'Content-Type: application/json' --data-raw '{}'
+```

aws/lambda/lambdaslackbot/go.mod

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+module github.com/ledongthuc/lambdaslackbot
+
+go 1.16
+
+require (
+	github.com/aws/aws-lambda-go v1.23.0
+	github.com/sirupsen/logrus v1.8.1
+)

aws/lambda/lambdaslackbot/go.sum

@@ -0,0 +1,26 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/aws/aws-lambda-go v1.23.0 h1:Vjwow5COkFJp7GePkk9kjAo/DyX36b7wVPKwseQZbRo=
+github.com/aws/aws-lambda-go v1.23.0/go.mod h1:jJmlefzPfGnckuHdXX7/80O3BvUUi12XOkbv4w9SGLU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
+github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/urfave/cli/v2 v2.2.0/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

aws/lambda/lambdaslackbot/main.go

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+package main
+
+import (
+	"encoding/base64"
+	"net/url"
+	"os"
+
+	"github.com/aws/aws-lambda-go/events"
+	"github.com/aws/aws-lambda-go/lambda"
+	"github.com/sirupsen/logrus"
+)
+
+func HandleRequest(request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
+	logrus.SetFormatter(&logrus.JSONFormatter{})
+	logrus.WithFields(logrus.Fields{
+		"env":               os.Environ(),
+		"request_id":        request.RequestContext.RequestID,
+		"method":            request.HTTPMethod,
+		"path":              request.Path,
+		"res":               request.Resource,
+		"body":              request.Body,
+		"is_base64_encoded": request.IsBase64Encoded,
+	}).Info("New request")
+
+	body := request.Body
+	if request.IsBase64Encoded {
+		b, err := base64.URLEncoding.DecodeString(request.Body)
+		if err != nil {
+			logrus.Error(err)
+			return events.APIGatewayProxyResponse{
+				Body:       "Fail to process: decode request: " + err.Error(),
+				StatusCode: 200,
+			}, nil
+		}
+		body = string(b)
+	}
+
+	arguments, err := url.ParseQuery(body)
+	if err != nil {
+		return events.APIGatewayProxyResponse{
+			Body:       "Fail to process: parse request: " + err.Error(),
+			StatusCode: 200,
+		}, nil
+	}
+	logrus.WithFields(logrus.Fields{
+		"arguments": arguments,
+	}).Info("Arguments")
+
+	msg := awsInsatncesMsg()
+	return events.APIGatewayProxyResponse{
+		Body:       msg,
+		StatusCode: 200,
+	}, nil
+}
+
+func main() {
+	lambda.Start(HandleRequest)
+}
+func awsInsatncesMsg() string {
+	return "Hello guy\nNice to meet you<br/>Good bye"
+}

aws/lambda/lambdaslackbot/main.tf

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+provider "aws" {
+  region = "ap-southeast-2"
+}
+
+resource "aws_iam_role" "iam_for_lambda" {
+  name = "iam_for_lambda"
+
+  assume_role_policy = <<EOF
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Action": "sts:AssumeRole",
+      "Principal": {
+        "Service": "lambda.amazonaws.com"
+      },
+      "Effect": "Allow",
+      "Sid": ""
+    }
+  ]
+}
+EOF
+}
+
+data "aws_iam_policy" "AWSLambdaBasicExecutionRole" {
+  arn = "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
+}
+
+resource "aws_iam_role_policy_attachment" "iam_for_lambda_cloudwatch" {
+  role       = aws_iam_role.iam_for_lambda.name
+  policy_arn = data.aws_iam_policy.AWSLambdaBasicExecutionRole.arn
+}
+
+locals {
+  path = "/dbbackup"
+  function_name = "FakeChimera2"
+}
+
+resource "aws_lambda_function" "test_lambda" {
+  function_name = local.function_name
+  role          = aws_iam_role.iam_for_lambda.arn
+
+  package_type = "Image"
+  image_uri = "270431303334.dkr.ecr.ap-southeast-2.amazonaws.com/hello-world:latest"
+}
+
+resource "aws_cloudwatch_log_group" "example" {
+  name              = "/aws/lambda/${local.function_name}"
+  retention_in_days = 7
+}
+
+resource "aws_apigatewayv2_api" "api" {
+  name          = "api-fake-chimera"
+  protocol_type = "HTTP"
+  target        = aws_lambda_function.test_lambda.arn
+  route_key = "POST ${local.path}"
+}
+
+resource "aws_lambda_permission" "apigw" {
+  action        = "lambda:InvokeFunction"
+  function_name = aws_lambda_function.test_lambda.arn
+  principal     = "apigateway.amazonaws.com"
+  source_arn = "${aws_apigatewayv2_api.api.execution_arn}/*/*"
+}
+
+output "base_url" {
+  value = "${aws_apigatewayv2_api.api.api_endpoint}${local.path}"
+}