crabka-client-consumer 0.3.0

Subscribe-style consumer client for Apache Kafka in Rust
Documentation 
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//! Error type for `crabka-client-consumer`.

use thiserror::Error;

/// Errors returned by [`Consumer`](crate::Consumer).
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum ConsumerError {
    #[error("client: {0}")]
    Client(#[from] crabka_client_core::ClientError),

    #[error("protocol: {0}")]
    Protocol(#[from] crabka_protocol::ProtocolError),

    #[error("rebalance failed: {0}")]
    RebalanceFailed(String),

    #[error("not subscribed to any topic")]
    NotSubscribed,

    #[error("illegal state: {0}")]
    IllegalState(String),

    #[error("commit conflict: rejoined since this poll")]
    CommitInvalid,

    #[error("coordinator unavailable")]
    CoordinatorUnavailable,

    #[error(
        "log truncation detected on {topic}-{partition}: fetch offset {fetch_offset} is past the leader's log; safe offset {safe_offset}"
    )]
    LogTruncation {
        topic: String,
        partition: i32,
        fetch_offset: i64,
        safe_offset: i64,
    },

    #[error("broker error_code {0}")]
    Server(i16),
}

#[cfg(test)]
mod tests {
    use super::*;
    use assert2::assert;

    #[test]
    fn display_not_subscribed() {
        let e = ConsumerError::NotSubscribed;
        assert!(e.to_string().contains("not subscribed"));
    }

    #[test]
    fn display_server_error_code() {
        let e = ConsumerError::Server(25);
        assert!(e.to_string().contains("25"));
    }

    #[test]
    fn display_log_truncation() {
        let e = ConsumerError::LogTruncation {
            topic: "t".into(),
            partition: 3,
            fetch_offset: 100,
            safe_offset: 42,
        };
        let s = e.to_string();
        assert!(s.contains("truncation"));
        assert!(s.contains("42"));
    }
}