heliosdb_proxy/backend/
error.rs

1//! Backend client error types.
2
3use thiserror::Error;
4
5/// Errors produced while acting as a PostgreSQL client.
6#[derive(Debug, Error)]
7pub enum BackendError {
8    /// I/O on the underlying TCP or TLS stream failed.
9    #[error("backend I/O error: {0}")]
10    Io(#[from] std::io::Error),
11
12    /// The backend closed the connection before the expected reply
13    /// arrived (e.g. TCP RST, idle timeout, server shutdown).
14    #[error("backend closed connection unexpectedly")]
15    Closed,
16
17    /// A protocol-level violation: unexpected message type, malformed
18    /// payload, or truncated frame.
19    #[error("protocol violation: {0}")]
20    Protocol(String),
21
22    /// The backend returned an `ErrorResponse` (tag `E`). The string is
23    /// the `M` (Message) field, which is always present.
24    #[error("backend error: {0}")]
25    BackendError(String),
26
27    /// Authentication did not complete successfully — wrong password,
28    /// unsupported SASL mechanism, or SCRAM server verifier mismatch.
29    #[error("authentication failed: {0}")]
30    Auth(String),
31
32    /// TLS handshake failed. String carries the rustls diagnostic.
33    #[error("TLS error: {0}")]
34    Tls(String),
35
36    /// Unsupported type OID in a result column — the proxy only knows
37    /// how to decode a fixed set of common OIDs.
38    #[error("unsupported type OID: {0}")]
39    UnsupportedType(u32),
40
41    /// Value parsing (text-format) failed — e.g. malformed int, bad
42    /// boolean string, invalid timestamp.
43    #[error("value parse error: column {column}: {reason}")]
44    ParseValue { column: String, reason: String },
45}
46
47pub type BackendResult<T> = std::result::Result<T, BackendError>;
heliosdb_proxy/backend/error.rs

heliosdb_proxy/backend/
error.rs
