ExternalService.CircuitBreaker.Fuse (ExternalService v2.2.0)

The default circuit breaker backend, built on the :fuse library.

This is the breaker ExternalService has always used, and you get it without configuring anything. It is node-local: each node counts its own failures and opens its own breaker, which is usually what you want — a node with a bad network path should stop calling the service without taking the rest of the cluster down with it.

It is configured through the ordinary :circuit_breaker options (:tolerate, :within, :reset, :fault_injection); see ExternalService.start/2.

Summary

Functions

strategy(options)

Builds the :fuse strategy tuple for the given circuit breaker options.

tolerate(arg)

Returns the number of failures the breaker tolerates before opening.

Functions

strategy(options)

@spec strategy(keyword()) :: tuple()

Builds the :fuse strategy tuple for the given circuit breaker options.

Exposed so that backends layered on top of this one (such as ExternalService.CircuitBreaker.Cluster) can reuse it.

tolerate(arg)

@spec tolerate(ExternalService.CircuitBreaker.config()) :: pos_integer()

Returns the number of failures the breaker tolerates before opening.

Read back out of an installed breaker's config, so that a layered backend can work out how many melts it takes to trip this node's breaker.