onlyne-store 2.0.0

Onlyne SQLite persistence
Documentation 
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use std::fmt;

use onlyne_proto::text::{SchemaMismatch, unsupported_schema_message};

pub type StoreResult<T> = std::result::Result<T, StoreError>;

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum StoreError {
    /// The file is not one this build can open, and `which` names it: `"server"`
    /// or `"client"`. The reason travels with the error so the sentence can
    /// name the revision that was found, which is the half an operator acts on.
    UnsupportedSchema {
        /// Which database refused the open.
        which: &'static str,
        /// What the marker or the table list actually said.
        mismatch: SchemaMismatch,
    },
    NotFound,
    Busy,
    Sqlite(String),
    Serialization(String),
    InvalidState {
        from: String,
        to: String,
    },
}

impl StoreError {
    pub(crate) fn unsupported_schema(which: &'static str, mismatch: SchemaMismatch) -> Self {
        StoreError::UnsupportedSchema { which, mismatch }
    }
}

impl fmt::Display for StoreError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            StoreError::UnsupportedSchema { which, mismatch } => {
                f.write_str(&unsupported_schema_message(which, mismatch))
            }
            StoreError::NotFound => f.write_str("not found"),
            StoreError::Busy => f.write_str("database busy"),
            StoreError::Sqlite(message) => write!(f, "sqlite: {message}"),
            StoreError::Serialization(message) => write!(f, "serialization: {message}"),
            StoreError::InvalidState { from, to } => {
                write!(f, "invalid ledger state transition {from} -> {to}")
            }
        }
    }
}

impl std::error::Error for StoreError {}

impl From<rusqlite::Error> for StoreError {
    fn from(value: rusqlite::Error) -> Self {
        match &value {
            rusqlite::Error::SqliteFailure(err, _) => match err.code {
                rusqlite::ErrorCode::DatabaseBusy | rusqlite::ErrorCode::DatabaseLocked => {
                    StoreError::Busy
                }
                _ => StoreError::Sqlite(value.to_string()),
            },
            _ => StoreError::Sqlite(value.to_string()),
        }
    }
}

impl From<serde_json::Error> for StoreError {
    fn from(value: serde_json::Error) -> Self {
        StoreError::Serialization(value.to_string())
    }
}

impl From<chrono::ParseError> for StoreError {
    fn from(value: chrono::ParseError) -> Self {
        StoreError::Serialization(value.to_string())
    }
}