Enum ServeError 

pub enum ServeError {
    Source(SourceError),
    Reply(StdioError),
    Diagnostics(StdioError),
}

Why the session ended when it was not the peer ending it.

Every variant is terminal. The loop cannot tell a peer that has gone how it went, and carrying on would mean serving a conversation nobody is in.

Variants

Source(SourceError)

The peer’s stream could not be read.

Latched by StdioSource, so this is where the session ends rather than a frame that will be tried again.

Reply(StdioError)

A reply could not be written.

Includes StdioError::ReplyTooLarge, which is refused before any byte reaches the stream — so a peer never sees a truncated frame, which on a newline protocol it could not detect.

Diagnostics(StdioError)

The diagnostics channel could not be written.

Fatal rather than ignored, which is the opposite of the advice Diagnostics::write_all offers a caller. The loop is the top of the process: if it cannot say what it is doing, it should stop doing it, rather than serve requests from a state only it knows about.

Trait Implementations

impl Debug for ServeError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ServeError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for ServeError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.