harmos-runtime 0.1.4

Harmos runtime: managed state, undo, recovery, background work and typed streams.
Documentation 
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/* ***
 *
 * Harmos
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * ***
 */

/* === Modules === */

/* === Re-Exports === */

pub use harmos_domain::state::{CatalogCodec, PreparationError, Prepared, Record, RecordCatalog, RecordProjection, Records};

/* === Imports === */

// Standard Library Imports

// Third Party Imports

// Local Imports
use super::envelope::Recorded;
use super::transaction::DecodeError;
use crate::Application;

/* === Constants === */

/* === Macros === */

/* === Type Aliases === */

pub(crate) type Upgrade<A, W> = fn(W) -> Result<<A as Application>::Record, DecodeError>;

/* === Structs === */

pub(crate) struct PreparedCommit<A: Application> {
    pub(crate) transaction: Prepared,
    pub(crate) records: Vec<(Recorded<A>, Prepared)>,
}

/* === Enums === */

/* === Traits === */

/* === Implementations === */

/* === Public Functions === */

pub(crate) fn prepare<A: Application>(
    transaction: &A::Transaction, state: &A::State, catalog: &super::dispatch::Dispatch<A, crate::storage::Payload<A>>,
) -> Result<PreparedCommit<A>, PreparationError> {
    let (prepared, members) = Records::collect(transaction, state)?;
    let records = members
        .into_iter()
        .map(|(system, member)| {
            if let Some(fact) = system {
                return Ok((Recorded::System(fact), member));
            }
            if !matches!(catalog.has_record(&member.id, member.version), Ok(true)) {
                return Err(PreparationError::Membership);
            }
            let value = A::Record::restore(&member.id, member.version, &member.payload)
                .map_err(|_| PreparationError::Membership)?
                .ok_or(PreparationError::Membership)?;
            if value.identify() != (member.id.clone(), member.version) {
                return Err(PreparationError::Membership);
            }
            Ok((Recorded::Record(value), member))
        })
        .collect::<Result<Vec<_>, _>>()?;
    Ok(PreparedCommit { transaction: prepared, records })
}

/* === Private Functions === */

/* === Tests === */