Nestia Fetcher

Outline

npm install --save @nestia/fetcher

@nestia/fetcher is a fetcher library of Nestia SDK.

When you build an SDK (Software Development Kit) library interacting with remote HTTP server through the @nestia/sdk, the SDK library would be dependent on this @nestia/fetcher. Therefore, if you publish the SDK library on the NPM module, you have to add this @nestia/fetcher in the dependencies field of the package.json.

Also, if you're a client developer who've installed an SDK library which has been generated by the @nestia/sdk, you also need to install this @nestia/fetcher module. With the IConnection and HttpError instances provided by this @nestia/fetcher, you can enjoy the SDK library much conveniently.

Example

package.json

When you build an SDK library who've been generated by the @nestia/sdk, you have to add this @nestia/fetcher in the dependencies field of the package.json. If your project had installed the @nestia/sdk, you can write the dependencies' property by writing the npx nestia dependencies command on your console.

{
  "name": "payments-server-api",
  "dependencies": {
    "typia": "^3.4.9",
    "@nestia/fetcher": "^1.0.0"
  }
}

SDK Library

When you open a source file generated by the @nestia/sdk, you can find the SDK library is importing this @nestia/fetcher module in every functional files. Therefore, I repeat that you have to put this @nestia/fetcher down into the dependencies field of the package.json.

import { Fetcher, IConnection, Primitive } from "@nestia/fetcher";

/**
 * 결제 내역 발행하기.
 * 
 * @param connection connection information
 * @param input 결제 내역 입력 정보
 * @returns 결제 내역
 * 
 * @nestia Generated by Nestia - https://github.com/samchon/nestia
 * @controller PaymentHistoriesController.store()
 * @path POST /histories
 */
export function store
    (
        connection: IConnection,
        input: Primitive<store.Input>
    ): Promise<store.Output>
{
    return Fetcher.fetch
    (
        connection,
        store.CONFIG,
        store.METHOD,
        store.path(),
        input
    );
}
export namespace store
{
    export type Input = Primitive<IPaymentHistory.IStore>;
    export type Output = Primitive<IPaymentHistory>;

    export const METHOD = "POST" as const;
    export const PATH: string = "/histories";
    export const CONFIG: IConnection.IEncrypted = {
        input_encrypted: true,
        output_encrypted: true,
    };

    export function path(): string
    {
        return `/histories`;
    }
}

Utilization Code

After you've published the SDK library and let client developers to install the SDK library, the client developers would import this @nestia/fetcher module, too. They would utilize the IConnection and HttpError instances like below.

import payments from "payments-server-api";
import { IPaymentHistory } from "payments-server-api/lib/structures/IPaymentHistory";
import { IConnection, HttpError } from "@nestia/fetcher";

export async function main(): Promise<void>
{
    // CONNECTION INFO OF THE REMOTE HTTP SERVER
    const connection: IConnection = {
        host: "http://payments.somewhere.com",
        encryption: {
            key: "SqwHmmXm1fZteI3URPtoyBWFJDMQ7FBQ",
            iv: "9eSfjygAClnE1JJs"
        }
    };

    try
    {
        const input: IPaymentHistory.IStore = { ...SOME_DATA };
        const history: IPaymentHistory = await payments.functional.histories.store
        (
            connection,
            input
        );
    }
    catch (exp)
    {
        // HTTP-ERRROR
        if (exp instanceof HttpError)
            console.log(exp);
    }
}