chore: use HTTP calls to invoke the lambda from the tests (#1794)

Author: mdelapenya

modules/localstack/examples_test.go

@@ -1,10 +1,14 @@
 package localstack_test
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
 	"fmt"
 	"io"
+	"net/http"
 	"path/filepath"
+	"strings"
 	"time"
 
 	"github.com/testcontainers/testcontainers-go"
@@ -162,8 +166,8 @@ func ExampleRunContainer_usingLambdas() {
 
 	// the three commands below are doing the following:
 	// 1. create a lambda function
-	// 2. wait for the lambda function to be active
-	// 3. invoke the lambda function with a payload, writing the result to the output.txt file
+	// 2. create the URL function configuration for the lambda function
+	// 3. wait for the lambda function to be active
 	lambdaCommands := [][]string{
 		{
 			"awslocal", "lambda",
@@ -174,28 +178,75 @@ func ExampleRunContainer_usingLambdas() {
 			"--handler", "index.handler",
 			"--role", "arn:aws:iam::000000000000:role/lambda-role",
 		},
+		{"awslocal", "lambda", "create-function-url-config", "--function-name", lambdaName, "--auth-type", "NONE"},
 		{"awslocal", "lambda", "wait", "function-active-v2", "--function-name", lambdaName},
-		{"awslocal", "lambda", "invoke", "--function-name", lambdaName, "--payload", `{"body": "{\"num1\": \"10\", \"num2\": \"10\"}" }`, "output.txt"},
 	}
 	for _, cmd := range lambdaCommands {
-		_, _, err = container.Exec(ctx, cmd)
+		_, _, err := container.Exec(ctx, cmd)
 		if err != nil {
 			panic(err)
 		}
 	}
 
-	// the output.txt file lives in the WORKDIR of the localstack container
-	_, reader, err := container.Exec(ctx, []string{"cat", "output.txt"}, exec.Multiplexed())
+	// 4. get the URL for the lambda function
+	cmd := []string{
+		"awslocal", "lambda", "list-function-url-configs", "--function-name", lambdaName,
+	}
+	_, reader, err := container.Exec(ctx, cmd, exec.Multiplexed())
 	if err != nil {
 		panic(err)
 	}
 
-	content, err := io.ReadAll(reader)
+	buf := new(bytes.Buffer)
+	_, err = buf.ReadFrom(reader)
 	if err != nil {
 		panic(err)
 	}
-	fmt.Println(string(content))
+
+	content := buf.Bytes()
+
+	type FunctionURLConfig struct {
+		FunctionURLConfigs []struct {
+			FunctionURL      string `json:"FunctionUrl"`
+			FunctionArn      string `json:"FunctionArn"`
+			CreationTime     string `json:"CreationTime"`
+			LastModifiedTime string `json:"LastModifiedTime"`
+			AuthType         string `json:"AuthType"`
+		} `json:"FunctionUrlConfigs"`
+	}
+
+	v := &FunctionURLConfig{}
+	err = json.Unmarshal(content, v)
+	if err != nil {
+		panic(err)
+	}
+
+	httpClient := http.Client{
+		Timeout: 5 * time.Second,
+	}
+
+	functionURL := v.FunctionURLConfigs[0].FunctionURL
+	// replace the port with the one exposed by the container
+
+	mappedPort, err := container.MappedPort(ctx, "4566/tcp")
+	if err != nil {
+		panic(err)
+	}
+
+	functionURL = strings.ReplaceAll(functionURL, "4566", mappedPort.Port())
+
+	resp, err := httpClient.Post(functionURL, "application/json", bytes.NewBufferString(`{"num1": "10", "num2": "10"}`))
+	if err != nil {
+		panic(err)
+	}
+
+	jsonResponse, err := io.ReadAll(resp.Body)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(string(jsonResponse))
 
 	// Output:
-	// {"statusCode":200,"body":"The product of 10 and 10 is 100"}
+	// The product of 10 and 10 is 100
 }