AWS SDK for JavaScript AppMesh Client for Node.js, Browser and React Native.
App Mesh is a service mesh based on the Envoy proxy that makes it easy to monitor and control microservices. App Mesh standardizes how your microservices communicate, giving you end-to-end visibility and helping to ensure high availability for your applications.
App Mesh gives you consistent visibility and network traffic controls for every microservice in an application. You can use App Mesh with Amazon Web Services Fargate, Amazon ECS, Amazon EKS, Kubernetes on Amazon Web Services, and Amazon EC2.
App Mesh supports microservice applications that use service discovery
naming for their components. For more information about service discovery on Amazon ECS, see Service
Discovery in the Amazon Elastic Container Service Developer Guide. Kubernetes
kube-dns and coredns are supported. For more information,
see DNS
for Services and Pods in the Kubernetes documentation.
To install the this package, simply type add or install @aws-sdk/client-app-mesh using your favorite package manager:
npm install @aws-sdk/client-app-meshyarn add @aws-sdk/client-app-meshpnpm add @aws-sdk/client-app-mesh
The AWS SDK is modulized by clients and commands.
To send a request, you only need to import the AppMeshClient and
the commands you need, for example ListMeshesCommand:
// ES5 example
const { AppMeshClient, ListMeshesCommand } = require("@aws-sdk/client-app-mesh");// ES6+ example
import { AppMeshClient, ListMeshesCommand } from "@aws-sdk/client-app-mesh";To send a request, you:
- Initiate client with configuration (e.g. credentials, region).
- Initiate command with input parameters.
- Call
sendoperation on client with command object as input. - If you are using a custom http handler, you may call
destroy()to close open connections.
// a client can be shared by different commands.
const client = new AppMeshClient({ region: "REGION" });
const params = {
/** input parameters */
};
const command = new ListMeshesCommand(params);We recommend using await operator to wait for the promise returned by send operation as follows:
// async/await.
try {
const data = await client.send(command);
// process data.
} catch (error) {
// error handling.
} finally {
// finally.
}Async-await is clean, concise, intuitive, easy to debug and has better error handling as compared to using Promise chains or callbacks.
You can also use Promise chaining to execute send operation.
client.send(command).then(
(data) => {
// process data.
},
(error) => {
// error handling.
}
);Promises can also be called using .catch() and .finally() as follows:
client
.send(command)
.then((data) => {
// process data.
})
.catch((error) => {
// error handling.
})
.finally(() => {
// finally.
});We do not recommend using callbacks because of callback hell, but they are supported by the send operation.
// callbacks.
client.send(command, (err, data) => {
// process err and data.
});The client can also send requests using v2 compatible style. However, it results in a bigger bundle size and may be dropped in next major version. More details in the blog post on modular packages in AWS SDK for JavaScript
import * as AWS from "@aws-sdk/client-app-mesh";
const client = new AWS.AppMesh({ region: "REGION" });
// async/await.
try {
const data = await client.listMeshes(params);
// process data.
} catch (error) {
// error handling.
}
// Promises.
client
.listMeshes(params)
.then((data) => {
// process data.
})
.catch((error) => {
// error handling.
});
// callbacks.
client.listMeshes(params, (err, data) => {
// process err and data.
});When the service returns an exception, the error will include the exception information, as well as response metadata (e.g. request id).
try {
const data = await client.send(command);
// process data.
} catch (error) {
const { requestId, cfId, extendedRequestId } = error.$metadata;
console.log({ requestId, cfId, extendedRequestId });
/**
* The keys within exceptions are also parsed.
* You can access them by specifying exception names:
* if (error.name === 'SomeServiceException') {
* const value = error.specialKeyInException;
* }
*/
}Please use these community resources for getting help. We use the GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.
- Visit Developer Guide or API Reference.
- Check out the blog posts tagged with
aws-sdk-json AWS Developer Blog. - Ask a question on StackOverflow and tag it with
aws-sdk-js. - Join the AWS JavaScript community on gitter.
- If it turns out that you may have found a bug, please open an issue.
To test your universal JavaScript code in Node.js, browser and react-native environments, visit our code samples repo.
This client code is generated automatically. Any modifications will be overwritten the next time the @aws-sdk/client-app-mesh package is updated.
To contribute to client you can check our generate clients scripts.
This SDK is distributed under the Apache License, Version 2.0, see LICENSE for more information.