// Hackiness to set stagevariable: https://github.com/aws/aws-cdk/issues/6143#issuecomment-720432475
private AwsIntegration StageSpecificLambda(Lambda.Function lambda)
{
var credentialsRole = new IAM.Role(this, "apigateway-api-role", new IAM.RoleProps
{
AssumedBy = new IAM.ServicePrincipal("apigateway.amazonaws.com"),
});
// Add the regular lambda Arns to the credentialsRole
credentialsRole.AddToPolicy(
new IAM.PolicyStatement(new IAM.PolicyStatementProps
{
Actions = new[] { "lambda:InvokeFunction" },
Resources = new[]
{
lambda.FunctionArn,
$"{lambda.FunctionArn}:*"
},
Effect = IAM.Effect.ALLOW
})
);
var stageLambda = Lambda.Function.FromFunctionArn(this, "MyLambda-preprod", lambda.FunctionArn + ":${stageVariables.lambdaAlias}");
// Add the stageLambda Arn to the integration.
var integration = new AwsIntegration(new AwsIntegrationProps
{
Proxy = true,
Service = "lambda",
Path = $"2015-03-31/functions/{stageLambda.FunctionArn}/invocations",
Options = new IntegrationOptions
{
CredentialsRole = credentialsRole,
}
});
return(integration);
}
internal ApigwSnsSqsLambdaCdkDotnetStack(Construct scope, string id, IStackProps props = null) : base(scope, id, props)
{
var topicCarPriceChange = new Topic(this, "CarPriceChange");
var queueCarChangeQueueNonPremium = new Queue(this, "CarChangeQueueNonPremium", new QueueProps
{
VisibilityTimeout = Duration.Seconds(300)
});
topicCarPriceChange.AddSubscription(new SqsSubscription(queueCarChangeQueueNonPremium));
var lambdaCarChangeQueueNonPremium = new Function(this, "nonPremiumWorkerHandler", new FunctionProps
{
Runtime = Runtime.DOTNET_CORE_3_1,
Handler = "ApiEventHandler::ApiEventHandler.Function::SQSHandler",
Code = Code.FromAsset("./src/lambdaHandler/ApiEventHandler/src/ApiEventHandler/bin/Debug/netcoreapp3.1"),
});
lambdaCarChangeQueueNonPremium.AddEventSource(new SqsEventSource(queueCarChangeQueueNonPremium));
var queueCarChangeQueuPremium = new Queue(this, "CarChangeQueuePremium", new QueueProps
{
VisibilityTimeout = Duration.Seconds(300)
});
topicCarPriceChange.AddSubscription(new SqsSubscription(queueCarChangeQueuPremium));
IEnumerable <string?> commands = new[]
{
"cd /asset-input",
"export DOTNET_CLI_HOME=\"/tmp/DOTNET_CLI_HOME\"",
"export PATH=\"$PATH:/tmp/DOTNET_CLI_HOME/.dotnet/tools\"",
"dotnet tool install -g Amazon.Lambda.Tools",
"dotnet lambda package -o output.zip",
"unzip -o -d /asset-output output.zip"
};
var lambdaCarChangeQueuePremium = new Function(this, "premiumWorkerHandler", new FunctionProps
{
Runtime = Runtime.DOTNET_CORE_3_1,
Handler = "Lambdas::Lambdas.Function::SQSHandler",
Code = Code.FromAsset("./src/lambdaHandler/ApiEventHandler/src/ApiEventHandler", new AssetOptions
{
Bundling = new BundlingOptions
{
Image = Runtime.DOTNET_CORE_3_1.BundlingImage,
Command = new[]
{
"bash", "-c", string.Join(" && ", commands)
}
}
})
});
lambdaCarChangeQueuePremium.AddEventSource(new SqsEventSource(queueCarChangeQueuPremium));
var gateWayExecutionRole = new Role(this, "GatewayExecutionRole", new RoleProps
{
AssumedBy = new ServicePrincipal("apigateway.amazonaws.com"),
InlinePolicies = new Dictionary <string, PolicyDocument>
{
{
"PublishMessagePolicy", new PolicyDocument(new PolicyDocumentProps
{
Statements = new[] {
new PolicyStatement(new PolicyStatementProps
{
Actions = new [] { "sns:Publish" },
Resources = new [] { topicCarPriceChange.TopicArn }
})
}
})
}
}
}
);
//Api Gateway
var awsIntegration = new AwsIntegration(new AwsIntegrationProps
{
Service = "sns",
IntegrationHttpMethod = "POST",
Path = "/",
Options = new IntegrationOptions
{
CredentialsRole = gateWayExecutionRole,
PassthroughBehavior = PassthroughBehavior.NEVER,
RequestParameters = new Dictionary <string, string> {
{ "integration.request.header.Content-Type", "'application/x-www-form-urlencoded'" }
},
RequestTemplates = new Dictionary <string, string> {
{ "application/json", "Action=Publish&TopicArn=$util.urlEncode('" + topicCarPriceChange.TopicArn + "')&Message=$util.urlEncode($input.body)" }
},
IntegrationResponses = new[] {
new IntegrationResponse {
StatusCode = "200",
ResponseTemplates = new Dictionary <string, string> {
{ "application/json", @"{""status"": ""message added to topic""}" }
}
},
new IntegrationResponse {
StatusCode = "400",
SelectionPattern = "^\\[Error\\].*",
ResponseTemplates = new Dictionary <string, string> {
{ "application/json", "{\"state\":\"error\",\"message\":\"$util.escapeJavaScript($input.path('$.errorMessage'))\"}" }
}
}
}
},
});
var apiGateWay = new RestApi(this, "CarPriceChangeApi");
apiGateWay.Root.AddMethod("POST", awsIntegration, new MethodOptions
{
MethodResponses = new[] { new MethodResponse {
StatusCode = "200"
},
new MethodResponse {
StatusCode = "400"
} }
});
}
