@stedi/sdk-client-functions

@stedi/sdk-client-functions

Description

Stedi SDK for JavaScript that includes Functions Client for Node.js, Browser and React Native.

Stedi Functions lets you run code without provisioning or managing servers.

If you want to configure bucket notifications that automatically invoke a function, you should use the Stedi Buckets SDK.

Installing

To install the this package, simply type add or install @stedi/sdk-client-functions using your favorite package manager:

• npm install @stedi/sdk-client-functions
• yarn add @stedi/sdk-client-functions
• pnpm add @stedi/sdk-client-functions

Getting Started

Import

The Stedi SDK is modulized by clients and commands. To send a request, you only need to import the FunctionsClient and the commands you need, for example CreateFunctionCommand:

// ES5 example
const { FunctionsClient, CreateFunctionCommand } = require("@stedi/sdk-client-functions");

// ES6+ example
import { FunctionsClient, CreateFunctionCommand } from "@stedi/sdk-client-functions";

Usage

To send a request, you:

• Initiate client with configuration (e.g. credentials, region).
• Initiate command with input parameters.
• Call send operation 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 FunctionsClient({ region: "REGION" });

const params = { /** input parameters */ };
const command = new CreateFunctionCommand(params);

Async/await

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.

Promises

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.
  });

Callbacks

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.
});

Troubleshooting

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 checking if it is a certain instance of exception:
   * if (error instanceof SomeServiceException) {
   *     const value = error.specialKeyInException;
   * }
   */
}

License

This SDK is distributed under the Apache License, Version 2.0, see LICENSE for more information.