mc-utils

this is general utilities for usage in Map Colonies project.

included components

• http client

usage

http client

this is abstract base class for sending http request with logging and request retries.

this class constructor requires the following parameters:

• ILogger instance.
• base url to use for all requests.
• optional name for target service to be used in logs.
• optional retry configuration.

the class have the following protected attributes -axiosOptions the options used by axios when sending requests

the class have the protected methods for sending http requests:

• protected async get<T>(url: string, queryParams?: Record<string, unknown>, retryConfig?: IAxiosRetryConfig, auth?: AxiosBasicCredentials, headers?: unknown): Promise<T>
• protected async post<T>(url: string, body?: unknown, queryParams?: Record<string, unknown>, retryConfig?: IAxiosRetryConfig, auth?: AxiosBasicCredentials, headers?: unknown): Promise<T>
• protected async put<T>(url: string, body?: unknown, queryParams?: Record<string, unknown>, retryConfig?: IAxiosRetryConfig, auth?: AxiosBasicCredentials, headers?: unknown): Promise<T>
• protected async delete<T>(url: string, queryParams?: Record<string, unknown>, retryConfig?: IAxiosRetryConfig, auth?: AxiosBasicCredentials, headers?: unknown): Promise<T>
• protected async head<T>(url: string, queryParams?: Record<string, unknown>, retryConfig?: IAxiosRetryConfig, auth?: AxiosBasicCredentials, headers?: unknown): Promise<T>
• protected async options<T>(url: string, queryParams?: Record<string, unknown>, retryConfig?: IAxiosRetryConfig, auth?: AxiosBasicCredentials, headers?: unknown): Promise<T>
• protected async patch<T>(url: string, body?: unknown, queryParams?: Record<string, unknown>, retryConfig?: IAxiosRetryConfig, auth?: AxiosBasicCredentials, headers?: unknown): Promise<T>

function parameters list:

• url: url path to send the request to (not including the base url).
• body: optional object to be used as request body (in relevant request types).
• queryParams: optional dictionary with query parameters and value.
• retryConfig: optional override to the class retry configuration.
• auth: optional basic authentication object (username, password).
• headers: optional headers to proceed to the request.

usage example:

class myServiceClient extends HttpClient {
  public constructor(logger: ILogger){
    super(logger,'https://myService.com','myService',{
      attempts: 3,
      delay: 'exponential',
      shouldResetTimeout: true
    })
  }

  public async getName(): string {
    const name = await this.get<string>('api/name',{queryParam1: 'name'});
    return name;
  }
}

models

ILogger

logger interface with the flowing log methods

• error(message:string)
• warn(message:string)
• info(message: string)
• debug(message: string)

IHttpRetryConfig

http requests retry configuration interface with the following attributes:

• attempts - the number of request to send until valid response (not 500+ status code). this value must be integer and greater then 0.
• delay - the amount of time in ms to wait between attempts (for constant delay) or 'exponential' for exponential backoff.
• shouldResetTimeout boolean value to indicate if the request timeout should be for each request (true) or global for all attempts (false)