aviso 2.0.0-rc.3

Core client library for aviso-server, ECMWF's notification service.
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// (C) Copyright 2024- ECMWF and individual contributors.
//
// This software is licensed under the terms of the Apache Licence Version 2.0
// which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
// In applying this licence, ECMWF does not waive the privileges and immunities
// granted to it by virtue of its status as an intergovernmental organisation nor
// does it submit to any jurisdiction.

//! Error type returned by [`StateStore`](super::StateStore) operations.

use thiserror::Error;

/// Errors a [`StateStore`](super::StateStore) implementation can return.
#[non_exhaustive]
#[derive(Debug, Error)]
pub enum StoreError {
    /// I/O failure on the underlying state file.
    #[error("I/O error on state file: {0}")]
    Io(#[from] std::io::Error),

    /// In-memory state could not be serialised to JSON before writing.
    #[error("could not serialise state to JSON: {0}")]
    Encode(#[source] serde_json::Error),

    /// On-disk state file could not be parsed as JSON.
    #[error("could not parse state file: {0}")]
    Decode(#[source] serde_json::Error),

    /// File format version found on disk does not match the version
    /// this client reads and writes. Without a migration path, both
    /// newer (the client cannot interpret) and older (the file may
    /// have a different layout the current code does not understand)
    /// are rejected loudly rather than risk silent misinterpretation.
    #[error("state file format version {found} does not match supported version {supported}")]
    UnsupportedFileVersion {
        /// Version field read from the file.
        found: u32,
        /// Version this client reads and writes.
        supported: u32,
    },

    /// Key format version stored in the file does not match this client.
    ///
    /// The gate is an exact-match (`!=`), so both newer and older
    /// file versions surface here. Existing checkpoints become
    /// unreachable when this happens because keys cannot be
    /// re-derived from in-process state alone. The actionable
    /// recoveries are: delete the file and re-checkpoint from a
    /// fresh stream, run a client version that handles the file's
    /// `key_format_version` (which may mean upgrading OR
    /// downgrading depending on direction), or migrate the file
    /// manually if its layout is still recoverable.
    #[error("state file uses key_format_version {found}; this client uses {supported}")]
    UnsupportedKeyFormatVersion {
        /// Key format version read from the file.
        found: u32,
        /// Key format version this client uses.
        supported: u32,
    },

    /// A resume key entry in the file is not a valid hex-encoded SHA-256 digest.
    #[error("invalid resume key in state file: {message}")]
    InvalidResumeKey {
        /// Human-readable explanation (which key, why it failed).
        message: String,
    },

    /// The tokio blocking task that performed disk I/O failed.
    #[error("background task that performed the disk operation failed: {0}")]
    BackgroundTaskFailed(#[source] tokio::task::JoinError),
}