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//! Bus error type.
use crate::bus::codec::CodecError;
/// A bus-layer error.
#[derive(Debug, thiserror::Error)]
pub enum BusError {
/// The namespace / robot id / key root was not a legal, concrete key.
#[error("invalid bus namespace: {0}")]
Namespace(String),
/// A codec failure encoding or decoding a body.
#[error(transparent)]
Codec(#[from] CodecError),
/// An inbound sample's `api_version` did not match the receiver's selected
/// API version (never a silent drop — D62).
#[error("api_version mismatch on '{topic}': expected '{expected}', received '{received}'")]
ApiVersionMismatch {
/// The topic key.
topic: String,
/// The receiver's selected API version.
expected: String,
/// The producer's API version from bus metadata.
received: String,
},
/// An inbound sample carried an unsupported codec id.
#[error("unsupported codec id {0} on '{1}'")]
UnsupportedCodec(u8, String),
/// A required attachment / metadata was missing or malformed.
#[error("invalid bus metadata on '{topic}': {detail}")]
Metadata {
/// The topic key.
topic: String,
/// What was wrong.
detail: String,
},
/// The outbound queue was saturated (samples or bytes); the sample was
/// dropped rather than blocking the step loop (D35/D43e).
#[error("outbound queue saturated on '{topic}' ({detail}); sample dropped")]
Saturated {
/// The topic key.
topic: String,
/// Which bound was hit.
detail: String,
},
/// The underlying Zenoh transport failed.
#[error("bus transport error: {0}")]
Transport(String),
/// Attempted to publish on a wildcard (subscribe-only) topic.
#[error(transparent)]
WildcardPublish(#[from] crate::bus::topic::WildcardPublish),
/// The subscriber's source task ended (session closed).
#[error("subscriber closed")]
Closed,
}
/// Bus result alias.
pub type Result<T> = std::result::Result<T, BusError>;