Module error 

The error type of every connector call and the rule for what to do with each error.

One enum, Error, for all brokers. A connector maps everything its broker or network can say into one of nine variants, so the code that handles errors does not depend on the broker. Error::class gives the coarse answer to “may I try again”: see ErrorClass.

The one variant that needs care is Error::Unknown. It says that a command (place, cancel, replace) may or may not have reached the broker. Never repeat the command after it: look at the order first, see Error::Unknown.

Enums

ConfigError

A configuration problem: a value that is missing, malformed, or of the wrong kind for this broker.

Error

What can go wrong in a connector call.

ErrorClass

The coarse answer to “may I try this call again”: see Error::class.

TransportError

A network-level problem: connect, TLS, timeout of a read, a broken stream, a malformed answer.

Constants

NOT_FOUND

The code of an Error::Rejected that says “the broker does not know this”: an order, a cid, an instrument. The same string at every broker, so a caller compares with == and needs no case folding.