polyc-state-connect 2026.8.3

//! Server adapter for durable work claims.

use std::sync::{
    Arc,
    atomic::{AtomicBool, Ordering},
};

use connectrpc::{ConnectError, RequestContext, Response, Router, ServiceRequest, ServiceResult};
use polyc_proto::proto::polychrome::state::v1 as pb;
use polyc_state::{
    claims::{ClaimRead, ClaimWrite, GetAttemptHistory, GetClaimStatus},
    error::StateError,
    id::{CommandId, WorkId},
};
use tracing::Instrument as _;

use crate::{
    admission::{
        AudienceBinding, PeerIdentity, check_audience_binding, check_call_context_version,
        check_not_draining, check_transport_deadline, state_audience,
    },
    error::to_connect_error,
    trace::adopt_caller_trace,
    wire::{DeclaredCall, Kernel, declared_call},
};

use super::wire::{
    acquire_from_wire, complete_from_wire, granted_to_wire, history_to_wire, release_from_wire,
    renew_from_wire, scope_from_wire, status_to_wire,
};

/// Complete durable work-claims authority port.
pub trait StateClaimsAuthority: ClaimRead + ClaimWrite {}

impl<T> StateClaimsAuthority for T where T: ClaimRead + ClaimWrite {}

/// State's durable work-claims service.
pub struct ClaimsSvc {
    authority: Arc<dyn StateClaimsAuthority>,
    draining: Arc<AtomicBool>,
    binding: Arc<AudienceBinding>,
}

impl ClaimsSvc {
    /// Builds the service.
    #[must_use]
    pub const fn new(
        authority: Arc<dyn StateClaimsAuthority>,
        draining: Arc<AtomicBool>,
        binding: Arc<AudienceBinding>,
    ) -> Self {
        Self {
            authority,
            draining,
            binding,
        }
    }

    /// Registers the durable work-claim routes.
    #[must_use]
    pub fn register_on(self, router: Router) -> Router {
        use pb::StateClaimsServiceExt as _;
        Arc::new(self).register(router)
    }

    fn peer(ctx: &RequestContext) -> PeerIdentity {
        PeerIdentity::from_verified_leaf(
            ctx.peer_certs().and_then(<[_]>::first).map(|leaf| &**leaf),
        )
    }

    fn admit(
        &self,
        ctx: &RequestContext,
        context: impl Into<Option<pb::CallContext>>,
        method: &'static str,
    ) -> Result<(polyc_state::context::CallContext, tracing::Span), ConnectError> {
        check_not_draining(self.draining.load(Ordering::Relaxed))?;
        let declared: DeclaredCall =
            declared_call(context).map_err(|error| to_connect_error(&error))?;
        let family = polyc_state::claims::family();
        check_call_context_version(declared.version).map_err(|error| to_connect_error(&error))?;
        check_audience_binding(
            &Self::peer(ctx),
            &declared.audience,
            &state_audience(),
            &self.binding,
            &family,
        )
        .map_err(|error| to_connect_error(&error))?;
        check_transport_deadline(ctx.time_remaining(), &family)
            .map_err(|error| to_connect_error(&error))?;
        Ok((
            declared.origin_relative_context(),
            adopt_caller_trace(ctx.headers(), method),
        ))
    }

    async fn blocking<R: Send + 'static>(
        operation: impl FnOnce() -> Result<R, StateError> + Send + 'static,
    ) -> Result<R, ConnectError> {
        tokio::task::spawn_blocking(operation)
            .await
            .map_err(|_| {
                to_connect_error(&StateError::Unavailable {
                    family: polyc_state::claims::family(),
                    reach: polyc_state::error::OutageReach::PossiblyApplied,
                })
            })?
            .map_err(|error| to_connect_error(&error))
    }
}

#[allow(refining_impl_trait)]
impl pb::StateClaimsService for ClaimsSvc {
    async fn acquire(
        &self,
        ctx: RequestContext,
        request: ServiceRequest<'_, pb::AcquireClaimRequest>,
    ) -> ServiceResult<pb::AcquireClaimReply> {
        let message = request.to_owned_message();
        let (context, span) = self.admit(&ctx, message.context, "AcquireClaim")?;
        let command = acquire_from_wire(required(message.command, "acquire")?)
            .map_err(|error| to_connect_error(&error))?;
        let authority = Arc::clone(&self.authority);
        let granted = Self::blocking(move || authority.acquire(command, &context))
            .instrument(span)
            .await?;
        Response::ok(pb::AcquireClaimReply {
            granted: buffa::MessageField::some(granted_to_wire(&granted)),
            __buffa_unknown_fields: buffa::UnknownFields::default(),
        })
    }

    async fn renew(
        &self,
        ctx: RequestContext,
        request: ServiceRequest<'_, pb::RenewClaimRequest>,
    ) -> ServiceResult<pb::RenewClaimReply> {
        let message = request.to_owned_message();
        let (context, span) = self.admit(&ctx, message.context, "RenewClaim")?;
        let command = renew_from_wire(required(message.command, "renewal")?)
            .map_err(|error| to_connect_error(&error))?;
        let authority = Arc::clone(&self.authority);
        let granted = Self::blocking(move || authority.renew(command, &context))
            .instrument(span)
            .await?;
        Response::ok(pb::RenewClaimReply {
            granted: buffa::MessageField::some(granted_to_wire(&granted)),
            __buffa_unknown_fields: buffa::UnknownFields::default(),
        })
    }

    async fn complete(
        &self,
        ctx: RequestContext,
        request: ServiceRequest<'_, pb::CompleteClaimRequest>,
    ) -> ServiceResult<pb::CompleteClaimReply> {
        let message = request.to_owned_message();
        let (context, span) = self.admit(&ctx, message.context, "CompleteClaim")?;
        let command = complete_from_wire(required(message.command, "completion")?)
            .map_err(|error| to_connect_error(&error))?;
        let authority = Arc::clone(&self.authority);
        let receipt = Self::blocking(move || authority.complete(command, &context))
            .instrument(span)
            .await?;
        Response::ok(pb::CompleteClaimReply {
            receipt: buffa::MessageField::some(pb::Receipt::from(Kernel(&receipt))),
            __buffa_unknown_fields: buffa::UnknownFields::default(),
        })
    }

    async fn release(
        &self,
        ctx: RequestContext,
        request: ServiceRequest<'_, pb::ReleaseClaimRequest>,
    ) -> ServiceResult<pb::ReleaseClaimReply> {
        let message = request.to_owned_message();
        let (context, span) = self.admit(&ctx, message.context, "ReleaseClaim")?;
        let command = release_from_wire(required(message.command, "release")?)
            .map_err(|error| to_connect_error(&error))?;
        let authority = Arc::clone(&self.authority);
        let receipt = Self::blocking(move || authority.release(command, &context))
            .instrument(span)
            .await?;
        Response::ok(pb::ReleaseClaimReply {
            receipt: buffa::MessageField::some(pb::Receipt::from(Kernel(&receipt))),
            __buffa_unknown_fields: buffa::UnknownFields::default(),
        })
    }

    async fn get_status(
        &self,
        ctx: RequestContext,
        request: ServiceRequest<'_, pb::GetClaimStatusRequest>,
    ) -> ServiceResult<pb::GetClaimStatusReply> {
        let message = request.to_owned_message();
        let (context, span) = self.admit(&ctx, message.context, "GetClaimStatus")?;
        let request = GetClaimStatus::new(
            scope_from_wire(required(message.scope, "scope")?),
            WorkId::new(message.work),
        );
        let authority = Arc::clone(&self.authority);
        let status = Self::blocking(move || authority.status(request, &context))
            .instrument(span)
            .await?;
        Response::ok(pb::GetClaimStatusReply {
            status: buffa::MessageField::some(status_to_wire(&status)),
            __buffa_unknown_fields: buffa::UnknownFields::default(),
        })
    }

    async fn get_history(
        &self,
        ctx: RequestContext,
        request: ServiceRequest<'_, pb::GetClaimHistoryRequest>,
    ) -> ServiceResult<pb::GetClaimHistoryReply> {
        let message = request.to_owned_message();
        let (context, span) = self.admit(&ctx, message.context, "GetClaimHistory")?;
        let request = GetAttemptHistory::new(
            scope_from_wire(required(message.scope, "scope")?),
            WorkId::new(message.work),
        );
        let authority = Arc::clone(&self.authority);
        let history = Self::blocking(move || authority.history(request, &context))
            .instrument(span)
            .await?;
        Response::ok(pb::GetClaimHistoryReply {
            history: buffa::MessageField::some(history_to_wire(&history)),
            __buffa_unknown_fields: buffa::UnknownFields::default(),
        })
    }

    async fn get_receipt(
        &self,
        ctx: RequestContext,
        request: ServiceRequest<'_, pb::GetClaimReceiptRequest>,
    ) -> ServiceResult<pb::GetClaimReceiptReply> {
        let message = request.to_owned_message();
        let (_context, span) = self.admit(&ctx, message.context, "GetClaimReceipt")?;
        let scope = scope_from_wire(required(message.scope, "scope")?);
        let command_id = CommandId::new(message.command_id);
        let authority = Arc::clone(&self.authority);
        let receipt = Self::blocking(move || authority.committed_receipt(&scope, &command_id))
            .instrument(span)
            .await?;
        Response::ok(pb::GetClaimReceiptReply {
            receipt: receipt.map_or_else(buffa::MessageField::none, |receipt| {
                buffa::MessageField::some(pb::Receipt::from(Kernel(&receipt)))
            }),
            __buffa_unknown_fields: buffa::UnknownFields::default(),
        })
    }
}

// Named over `P: buffa::ProtoBox<T>` rather than `impl Into<Option<T>>`: see
// `crate::wire::required`'s doc comment.
fn required<T: Default, P: buffa::ProtoBox<T>>(
    field: buffa::MessageField<T, P>,
    name: &'static str,
) -> Result<T, ConnectError> {
    field.into_option().ok_or_else(|| {
        to_connect_error(&StateError::Malformed {
            field: name.to_owned(),
            reason: format!("a claim request carries its {name}"),
        })
    })
}