ic-backup 0.58.0

Host-side snapshot backup and same-release recovery for Internet Computer canisters
Documentation 
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//! One freshly reserved metadata/data update; no automatic receipt or retry.

use crate::{
    model::{
        ic_snapshot_transfer_read::{
            IcSnapshotTransferReadError, IcSnapshotTransferReadPayload,
            IcSnapshotTransferReadRequest, IcSnapshotTransferReadResponse,
        },
        operation_plan::OperationPlanError,
    },
    ops::persistence::{
        AttemptJournalError, AttemptJournalGuard, ExecutionProgressPersistenceError,
        ExecutionStageGuard, ExecutionWorkflowPersistenceError,
    },
    policy::ic_snapshot_transfer_read::{
        IcSnapshotTransferReadAssociationError, IcSnapshotTransferReadView, validate_response,
    },
    ports::{
        ic_observation::IcObservationProviderError,
        ic_snapshot_transfer_read::IcSnapshotTransferReadProvider,
    },
};
use thiserror::Error;

// Complete a compound read while its original guard and decoded reply remain alive.
// The continuation owns qualification and append/receipt ordering; checkpointing
// happens only after this function has released the selected journal guard.
pub(super) async fn read_snapshot_with<E: std::error::Error + 'static, T>(
    stage: &ExecutionStageGuard<'_>,
    operation_sequence: u64,
    payload: IcSnapshotTransferReadPayload<'_, '_>,
    provider: &mut impl IcSnapshotTransferReadProvider,
    admit: impl AsyncFnOnce(&IcSnapshotTransferReadRequest<'_, '_>) -> Result<(), E>,
    complete: impl AsyncFnOnce(
        &mut AttemptJournalGuard<'_>,
        &IcSnapshotTransferReadRequest<'_, '_>,
        &IcSnapshotTransferReadView<'_, '_>,
    ) -> T,
) -> Result<(IcSnapshotTransferReadResponse, T), IcSnapshotTransferReadExecutionError<E>> {
    let plan = stage.plan();
    let authority = plan.attempt_authority(operation_sequence)?;
    payload.validate_binding(&authority)?;
    let (response, result) = super::ic_mutation::execute_reserved(
        stage,
        &authority,
        |_| Ok::<_, IcSnapshotTransferReadExecutionError<E>>(()),
        |journal| {
            Ok(IcSnapshotTransferReadRequest::new(
                plan,
                operation_sequence,
                journal,
                payload,
            )?)
        },
        async |request| {
            admit(request)
                .await
                .map_err(IcSnapshotTransferReadExecutionError::Admission)?;
            stage.layout()?;
            Ok(())
        },
        async |request, journal| Ok(provider.read_snapshot(request, journal).await?),
        async |journal, request, response| {
            let admitted = validate_response(request, journal.record()?, response)?;
            stage.layout()?;
            Ok::<_, IcSnapshotTransferReadReplyError>(complete(journal, request, &admitted).await)
        },
    )
    .await?;
    super::qualified_receipt::retain_reply(response, result, |source, response| {
        IcSnapshotTransferReadExecutionError::AfterReply { source, response }
    })
}

/// Typed step failures retain original spending; returned raw replies remain available.
#[derive(Debug, Error)]
pub enum IcSnapshotTransferReadExecutionError<E: std::error::Error + 'static> {
    /// The original operation cannot be derived.
    #[error(transparent)]
    Plan(#[from] OperationPlanError),
    /// Retained workflow, stage or ancestors changed before dispatch.
    #[error(transparent)]
    Stage(#[from] ExecutionWorkflowPersistenceError),
    /// Original journal admission or durable reservation failed.
    #[error(transparent)]
    Journal(#[from] AttemptJournalError),
    /// Complete original progress, prerequisites or reservation failed.
    #[error(transparent)]
    Progress(#[from] ExecutionProgressPersistenceError),
    /// Exact original payload/reservation admission failed.
    #[error(transparent)]
    Request(#[from] IcSnapshotTransferReadError),
    /// Integration-owned fresh admission failed after durable reservation.
    #[error("fresh snapshot read admission failed: {0}")]
    Admission(#[source] E),
    /// The single provider call failed; its reservation stays pending.
    #[error(transparent)]
    Provider(#[from] IcObservationProviderError),
    /// Admission after a reply failed, retaining its complete bounded evidence.
    #[error("snapshot transfer read reply rejected: {source}")]
    AfterReply {
        /// Typed original admission failure.
        source: IcSnapshotTransferReadReplyError,
        /// Complete returned passive evidence, without settlement authority.
        response: Box<IcSnapshotTransferReadResponse>,
    },
}

/// Admission failure after a returned snapshot transfer read reply.
#[derive(Debug, Error)]
pub enum IcSnapshotTransferReadReplyError {
    /// Original selected journal cannot be re-admitted.
    #[error(transparent)]
    Journal(#[from] AttemptJournalError),
    /// Passive exact reply association failed.
    #[error(transparent)]
    Association(#[from] IcSnapshotTransferReadAssociationError),
    /// Original stage or ancestor evidence cannot be re-admitted.
    #[error(transparent)]
    Stage(#[from] ExecutionWorkflowPersistenceError),
}

#[cfg(all(test, unix))]
mod tests;