Add typed schema records and strict version checks

crates/lazaret-core/Cargo.toml

@@ -5,5 +5,9 @@ edition.workspace = true
 rust-version.workspace = true
 license.workspace = true
 
+[dependencies]
+postcard.workspace = true
+serde.workspace = true
+
 [lints]
 workspace = true

crates/lazaret-core/src/codec.rs

@@ -0,0 +1,85 @@
+//! Strict bounded Postcard structure checks shared by schema-record persistence and tests.
+
+use std::fmt;
+
+use serde::Serialize;
+use serde::de::DeserializeOwned;
+
+pub const MAX_SCHEMA_RECORD_BYTES: usize = 1024 * 1024;
+
+#[derive(Debug)]
+pub enum CodecError {
+    RecordTooLarge { length: usize, maximum: usize },
+    TrailingPayload,
+    NonMinimalPayload,
+    MalformedPayload(postcard::Error),
+}
+
+impl fmt::Display for CodecError {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::RecordTooLarge { length, maximum } => {
+                write!(formatter, "schema record length {length} exceeds {maximum}")
+            }
+            Self::TrailingPayload => {
+                formatter.write_str("schema record has trailing payload bytes")
+            }
+            Self::NonMinimalPayload => formatter
+                .write_str("schema record does not use the minimal Postcard representation"),
+            Self::MalformedPayload(error) => write!(formatter, "malformed schema payload: {error}"),
+        }
+    }
+}
+
+impl std::error::Error for CodecError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Self::MalformedPayload(error) => Some(error),
+            _ => None,
+        }
+    }
+}
+
+/// Encodes one schema value using Postcard's minimal representation.
+///
+/// # Errors
+///
+/// Returns an error when serialization fails or the encoded value exceeds the generic limit.
+pub fn encode<T: Serialize>(record: &T) -> Result<Vec<u8>, CodecError> {
+    let encoded = postcard::to_stdvec(record).map_err(CodecError::MalformedPayload)?;
+    if encoded.len() > MAX_SCHEMA_RECORD_BYTES {
+        return Err(CodecError::RecordTooLarge {
+            length: encoded.len(),
+            maximum: MAX_SCHEMA_RECORD_BYTES,
+        });
+    }
+    Ok(encoded)
+}
+
+/// Decodes one complete, minimally encoded schema value after enforcing the generic size limit.
+///
+/// # Errors
+///
+/// Returns an error for oversized, malformed, trailing, or non-minimal Postcard input.
+pub fn decode<T>(encoded: &[u8]) -> Result<T, CodecError>
+where
+    T: DeserializeOwned + Serialize,
+{
+    if encoded.len() > MAX_SCHEMA_RECORD_BYTES {
+        return Err(CodecError::RecordTooLarge {
+            length: encoded.len(),
+            maximum: MAX_SCHEMA_RECORD_BYTES,
+        });
+    }
+
+    let (record, remainder) =
+        postcard::take_from_bytes(encoded).map_err(CodecError::MalformedPayload)?;
+    if !remainder.is_empty() {
+        return Err(CodecError::TrailingPayload);
+    }
+    let minimal = postcard::to_stdvec(&record).map_err(CodecError::MalformedPayload)?;
+    if minimal != encoded {
+        return Err(CodecError::NonMinimalPayload);
+    }
+    Ok(record)
+}

crates/lazaret-core/src/identity.rs

@@ -0,0 +1,191 @@
+use serde::{Deserialize, Serialize};
+
+pub const OPAQUE_ID_BYTES: usize = 32;
+pub const SHA256_BYTES: usize = 32;
+
+macro_rules! opaque_identity {
+    ($($name:ident),+ $(,)?) => {
+        $(
+            #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
+            pub struct $name([u8; OPAQUE_ID_BYTES]);
+
+            impl $name {
+                #[must_use]
+                pub const fn new(bytes: [u8; OPAQUE_ID_BYTES]) -> Self {
+                    Self(bytes)
+                }
+
+                #[must_use]
+                pub const fn as_bytes(&self) -> &[u8; OPAQUE_ID_BYTES] {
+                    &self.0
+                }
+            }
+        )+
+    };
+}
+
+macro_rules! digest_identity {
+    ($($name:ident),+ $(,)?) => {
+        $(
+            #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
+            pub struct $name([u8; SHA256_BYTES]);
+
+            impl $name {
+                #[must_use]
+                pub const fn new(bytes: [u8; SHA256_BYTES]) -> Self {
+                    Self(bytes)
+                }
+
+                #[must_use]
+                pub const fn as_bytes(&self) -> &[u8; SHA256_BYTES] {
+                    &self.0
+                }
+            }
+        )+
+    };
+}
+
+macro_rules! numeric_identity {
+    ($($name:ident($inner:ty)),+ $(,)?) => {
+        $(
+            #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
+            pub struct $name($inner);
+
+            impl $name {
+                #[must_use]
+                pub const fn new(value: $inner) -> Self {
+                    Self(value)
+                }
+
+                #[must_use]
+                pub const fn get(self) -> $inner {
+                    self.0
+                }
+            }
+        )+
+    };
+}
+
+opaque_identity!(
+    DomainId,
+    CoordinatorId,
+    NetworkSidecarId,
+    SandboxId,
+    ClientId,
+    SessionId,
+    SessionAnchorId,
+    RequestId,
+    PreparedArtifactId,
+    PrepareOperationId,
+    ProtocolCredentialId,
+    CapabilityId,
+    ContainerId,
+    PolicyId,
+);
+
+digest_identity!(
+    ConfigurationFingerprint,
+    DerivedPolicyDigest,
+    ReadinessFingerprint,
+    BundleDigest,
+    SelectedManifestDigest,
+    IdMapDigest,
+    CertificateDigest,
+    TrustManifestDigest,
+    RequestDigest,
+    StreamDigest,
+);
+
+numeric_identity!(
+    GenerationId(u64),
+    ProcessId(u32),
+    ProcessStartTime(u64),
+    GuestProcessGroupId(u32),
+    FileDescriptor(i32),
+    DeviceId(u64),
+    InodeId(u64),
+    MountId(u64),
+);
+
+#[derive(Clone, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
+pub struct HostPath(Vec<u8>);
+
+impl HostPath {
+    #[must_use]
+    pub const fn new(bytes: Vec<u8>) -> Self {
+        Self(bytes)
+    }
+
+    #[must_use]
+    pub fn as_bytes(&self) -> &[u8] {
+        &self.0
+    }
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
+pub struct SourceIdentity(Vec<u8>);
+
+impl SourceIdentity {
+    #[must_use]
+    pub const fn new(bytes: Vec<u8>) -> Self {
+        Self(bytes)
+    }
+
+    #[must_use]
+    pub fn as_bytes(&self) -> &[u8] {
+        &self.0
+    }
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
+pub struct ProcessIdentity {
+    pub pid: ProcessId,
+    pub start_time: ProcessStartTime,
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
+pub struct NamespaceIdentity {
+    pub device: DeviceId,
+    pub inode: InodeId,
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
+pub struct MountIdentity {
+    pub mount_id: MountId,
+    pub device: DeviceId,
+    pub inode: InodeId,
+}
+
+#[cfg(test)]
+mod tests {
+    use std::any::TypeId;
+    use std::collections::HashSet;
+
+    use super::{
+        ContainerId, CoordinatorId, DomainId, GenerationId, MountIdentity, NamespaceIdentity,
+        NetworkSidecarId, PreparedArtifactId, ProcessIdentity, RequestId, SandboxId, SessionId,
+    };
+
+    #[test]
+    fn identity_categories_are_nominally_distinct() {
+        let identities = [
+            TypeId::of::<DomainId>(),
+            TypeId::of::<GenerationId>(),
+            TypeId::of::<CoordinatorId>(),
+            TypeId::of::<NetworkSidecarId>(),
+            TypeId::of::<SandboxId>(),
+            TypeId::of::<SessionId>(),
+            TypeId::of::<RequestId>(),
+            TypeId::of::<PreparedArtifactId>(),
+            TypeId::of::<ContainerId>(),
+            TypeId::of::<ProcessIdentity>(),
+            TypeId::of::<NamespaceIdentity>(),
+            TypeId::of::<MountIdentity>(),
+        ];
+
+        assert_eq!(
+            identities.into_iter().collect::<HashSet<_>>().len(),
+            identities.len()
+        );
+    }
+}

crates/lazaret-core/src/lib.rs

@@ -1,5 +1,9 @@
 #![doc = "Shared production interfaces for Lazaret processes."]
 
+pub mod codec;
+pub mod identity;
+pub mod records;
+
 pub const PROTOCOL_NAME: &str = "lazaret";
 
 #[cfg(test)]