PrometheusHandler

Constructors

this

this(FinalizeDg finalizer, CollectorRegistry collector_registry, EpollSelectDispatcher epoll, size_t stack_size)

Constructor.

Members

Functions

handleRequest

HttpResponseCode handleRequest(cstring response_msg_body)

Handles responses for incoming HTTP requests. Responds with stats when the request endpoint is /metrics. For all other endpoints, returns HttpResponseCode.NotImplemented. If stat collection throws an error, responds with HttpResponseCode.InternalServerError, with the exception message as the response message body;

notifyIOException

void notifyIOException(ErrnoException e, bool is_error)

Logs an warning or error message when an IOWarning or IOError, respectively, is caught.

Inherited Members

From HttpConnectionHandler

HttpResponseCode

alias HttpResponseCode = .HttpResponseCode

Type aliases as convenience for a subclass

HttpRequest

alias HttpRequest = .HttpRequest

Undocumented in source.

HttpResponse

alias HttpResponse = .HttpResponse

Undocumented in source.

HttpMethod

alias HttpMethod = .HttpMethod

Undocumented in source.

HttpException

alias HttpException = .HttpException

Undocumented in source.

HttpServerException

alias HttpServerException = .HttpServerException

Undocumented in source.

ErrnoException

alias ErrnoException = .ErrnoException

Undocumented in source.

IOError

alias IOError = .IFiberSelectProtocol.IOError

Undocumented in source.

IOWarning

alias IOWarning = .IFiberSelectProtocol.IOWarning

Undocumented in source.

request

HttpRequest request;

HTTP request message parser and response message generator

response

HttpResponse response;

Undocumented in source.

http_exception

HttpException http_exception;

Reused exception instance; may be thrown by a subclass as well.

keep_alive_maxnum

uint keep_alive_maxnum;

Maximum number of requests through the same connection when using persistent connections; 0 disables using persistent connections.

default_exception_status_code

auto default_exception_status_code;

Status code for the case when a required message header parameters are missing.

handle

void handle()

Connection handler method.

reset

void reset()

Resettable interface method; resets the request.

handleRequest

HttpResponseCode handleRequest(cstring response_msg_body)

Handles the request.

onResponseSent

void onResponseSent()

Called after handleRequest() has returned and when the response message buffer is no longer referenced or after handleRequest() has thrown an exception. A subclass may override this method to release resources. This is useful especially when a large number of persistent connections is open where each connection is only used sporadically.

request_msg_body_length

size_t request_msg_body_length()

Tells the request message body length. This method should be overridden when a request message body is expected. It is invoked when the message header is completely parsed. The default behaviour is expecting no request message body.

handleHttpServerException

bool handleHttpServerException(HttpServerException e)

Handles HTTP server exception e which was thrown while parsing the request message or from handleRequest() or request_msg_body_length() and is not a HttpException. A subclass may override this method to be notified when an exception is thrown and decide whether the connection may stay persistent or should be closed after the response has been sent. The default behaviour is allowing the connection to stay persistent.

handleHttpException

bool handleHttpException(HttpException e)

Handles HTTP exception e which was thrown while parsing the request message or from handleRequest() or request_msg_body_length(). A subclass may override this method to be notified when an exception is thrown and decide whether the connection may stay persistent or should be closed after the response has been sent. The default behaviour is allowing the connection being persistent unless the status code indicated by the exception is 413: "Request Entity Too Large".

notifyIOException

void notifyIOException(ErrnoException e, bool is_error)

Called when an IOWarning or IOError is caught. May be overridden by a subclass to be notified.

• PrometheusHandler
• PrometheusListener