public async Task <IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequestMessage req,
ILogger log,
[DurableClient] IDurableOrchestrationClient orchestrationClient
)
{
if (!await durableCircuitBreakerClient.IsExecutionPermitted(CircuitBreakerId, log, (IDurableClient)orchestrationClient))
{
log?.LogError($"{nameof(FooFragileFunctionWithCircuitBreaker)}: Service unavailable.");
return(new StatusCodeResult((int)HttpStatusCode.ServiceUnavailable));
}
try
{
var result = await Foo.DoFragileWork(req, log, "circuit breaker, performance priority");
await durableCircuitBreakerClient.RecordSuccess(CircuitBreakerId, log, (IDurableClient)orchestrationClient);
return(result);
}
catch (Exception exception)
{
await durableCircuitBreakerClient.RecordFailure(CircuitBreakerId, log, (IDurableClient)orchestrationClient);
log?.LogError(exception, $"{nameof(FooFragileFunctionWithCircuitBreaker)}: Exception: {exception.Message}");
return(new InternalServerErrorResult());
}
}
public async Task <IActionResult> IsExecutionPermitted(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = "DurableCircuitBreaker/{circuitBreakerId:alpha}/IsExecutionPermitted")] HttpRequestMessage req,
// GET http method left accessible for easy demonstration from a browser. Conceptually, even IsExecutionPermitted may change circuit state (to Half-Open), so might be considered POST-only.
string circuitBreakerId,
ILogger log,
[DurableClient] IDurableClient durableClient
)
{
return(new OkObjectResult(await durableCircuitBreakerClient.IsExecutionPermitted(circuitBreakerId, log, durableClient)));
}