handleErrors: Error-handling middleware

In beakr: A Minimalist Web Framework for R

Description

This default error handler should be added at the end of the beakr pipeline, right before listen(). Errors generated by any previous step will be returned within a JSON wrapper.

Usage

handleErrors(beakr = NULL, FUN = jsonError)

Arguments

beakr	Beakr instance
FUN	a function to handle the error response

Value

A Beakr instance with added middleware.

Note

If you run the example in the console, be sure to stopServer(bekar) when you are done.

Examples

library(beakr)

# Create an new beakr instance
beakr <- newBeakr()

# beakr pipeline
beakr %>%

  # Respond to GET requests at the "/hi" route
  httpGET(path = "/hi", function(req, res, err) {
    print("Hello, World!")
  }) %>%

  # Respond to GET requests at the "/bye" route
  httpGET(path = "/bye", function(req, res, err) {
    print("Farewell, my friends.")
  }) %>%

  handleErrors() %>%

  # Start the server on port 25118
  listen(host = "127.0.0.1", port = 25118, daemon = TRUE)

# ------------------------------------------------------------
# POINT YOUR BROWSER AT:
# * http://127.0.0.1:25118/NOT_A_ROUTE
#
# THEN, STOP THE SERVER WITH stopServer(beakr)
# ------------------------------------------------------------

# Stop the beakr instance server
stopServer(beakr)

beakr documentation built on April 7, 2021, 1:06 a.m.