sui_move_natives_v0/object_runtime/

object_store.rs

// Copyright (c) Mysten Labs, Inc.
// SPDX-License-Identifier: Apache-2.0

use crate::object_runtime::LocalProtocolConfig;
use move_binary_format::errors::{PartialVMError, PartialVMResult};
use move_core_types::{
    annotated_value as A, effects::Op, runtime_value as R, vm_status::StatusCode,
};
use move_vm_types::{
    loaded_data::runtime_types::Type,
    values::{GlobalValue, StructRef, Value},
};
use std::{
    collections::{btree_map, BTreeMap},
    sync::Arc,
};
use sui_protocol_config::{check_limit_by_meter, LimitThresholdCrossed};
use sui_types::{
    base_types::{MoveObjectType, ObjectID, SequenceNumber},
    error::VMMemoryLimitExceededSubStatusCode,
    metrics::LimitsMetrics,
    object::{Data, MoveObject, Object, Owner},
    storage::ChildObjectResolver,
};

use super::get_all_uids;
pub(super) struct ChildObject {
    pub(super) owner: ObjectID,
    pub(super) ty: Type,
    pub(super) move_type: MoveObjectType,
    pub(super) value: GlobalValue,
}

#[derive(Debug)]
pub(crate) struct ChildObjectEffect {
    pub(super) owner: ObjectID,
    // none if it was an input object
    pub(super) loaded_version: Option<SequenceNumber>,
    pub(super) ty: Type,
    pub(super) effect: Op<Value>,
}

struct Inner<'a> {
    // used for loading child objects
    resolver: &'a dyn ChildObjectResolver,
    // The version of the root object in ownership at the beginning of the transaction.
    // If it was a child object, it resolves to the root parent's sequence number.
    // Otherwise, it is just the sequence number at the beginning of the transaction.
    root_version: BTreeMap<ObjectID, SequenceNumber>,
    // cached objects from the resolver. An object might be in this map but not in the store
    // if it's existence was queried, but the value was not used.
    cached_objects: BTreeMap<ObjectID, Option<Object>>,
    // whether or not this TX is gas metered
    is_metered: bool,
    // Local protocol config used to enforce limits
    constants: LocalProtocolConfig,
    // Metrics for reporting exceeded limits
    metrics: Arc<LimitsMetrics>,
}

// maintains the runtime GlobalValues for child objects and manages the fetching of objects
// from storage, through the `ChildObjectResolver`
pub(super) struct ObjectStore<'a> {
    // contains object resolver and object cache
    // kept as a separate struct to deal with lifetime issues where the `store` is accessed
    // at the same time as the `cached_objects` is populated
    inner: Inner<'a>,
    // Maps of populated GlobalValues, meaning the child object has been accessed in this
    // transaction
    store: BTreeMap<ObjectID, ChildObject>,
    // whether or not this TX is gas metered
    is_metered: bool,
    // Local protocol config used to enforce limits
    constants: LocalProtocolConfig,
}

pub(crate) enum ObjectResult<V> {
    // object exists but type does not match. Should result in an abort
    MismatchedType,
    Loaded(V),
}

impl Inner<'_> {
    fn get_or_fetch_object_from_store(
        &mut self,
        parent: ObjectID,
        child: ObjectID,
    ) -> PartialVMResult<Option<&MoveObject>> {
        let cached_objects_count = self.cached_objects.len() as u64;
        let parents_root_version = self.root_version.get(&parent).copied();
        let had_parent_root_version = parents_root_version.is_some();
        // if not found, it must be new so it won't have any child objects, thus
        // we can return SequenceNumber(0) as no child object will be found
        let parents_root_version = parents_root_version.unwrap_or(SequenceNumber::new());
        if let btree_map::Entry::Vacant(e) = self.cached_objects.entry(child) {
            let child_opt = self
                .resolver
                .read_child_object(&parent, &child, parents_root_version)
                .map_err(|msg| {
                    PartialVMError::new(StatusCode::STORAGE_ERROR).with_message(format!("{msg}"))
                })?;
            let obj_opt = if let Some(object) = child_opt {
                // if there was no root version, guard against reading a child object. A newly
                // created parent should not have a child in storage
                if !had_parent_root_version {
                    return Err(PartialVMError::new(StatusCode::STORAGE_ERROR).with_message(
                        format!("A new parent {parent} should not have a child object {child}."),
                    ));
                }
                // guard against bugs in `read_child_object`: if it returns a child object such that
                // C.parent != parent, we raise an invariant violation
                match &object.owner {
                    Owner::ObjectOwner(id) => {
                        if ObjectID::from(*id) != parent {
                            return Err(PartialVMError::new(StatusCode::STORAGE_ERROR).with_message(
                                format!("Bad owner for {child}. \
                                Expected owner {parent} but found owner {id}")
                            ))
                        }
                    }
                    Owner::AddressOwner(_) | Owner::Immutable | Owner::Shared { .. } => {
                        return Err(PartialVMError::new(StatusCode::STORAGE_ERROR).with_message(
                            format!("Bad owner for {child}. \
                            Expected an id owner {parent} but found an address, immutable, or shared owner")
                        ))
                    }
                    Owner::ConsensusAddressOwner { .. } => {
                        unimplemented!("ConsensusAddressOwner does not exist for this execution version")
                    }
                };
                match object.data {
                    Data::Package(_) => {
                        return Err(PartialVMError::new(StatusCode::STORAGE_ERROR).with_message(
                            format!(
                                "Mismatched object type for {child}. \
                                Expected a Move object but found a Move package"
                            ),
                        ))
                    }
                    Data::Move(_) => Some(object),
                }
            } else {
                None
            };

            if let LimitThresholdCrossed::Hard(_, lim) = check_limit_by_meter!(
                self.is_metered,
                cached_objects_count,
                self.constants.object_runtime_max_num_cached_objects,
                self.constants
                    .object_runtime_max_num_cached_objects_system_tx,
                self.metrics.excessive_object_runtime_cached_objects
            ) {
                return Err(PartialVMError::new(StatusCode::MEMORY_LIMIT_EXCEEDED)
                    .with_message(format!(
                        "Object runtime cached objects limit ({} entries) reached",
                        lim
                    ))
                    .with_sub_status(
                        VMMemoryLimitExceededSubStatusCode::OBJECT_RUNTIME_CACHE_LIMIT_EXCEEDED
                            as u64,
                    ));
            };

            e.insert(obj_opt);
        }
        Ok(self
            .cached_objects
            .get(&child)
            .unwrap()
            .as_ref()
            .map(|obj| obj.data.try_as_move().unwrap()))
    }

    fn fetch_object_impl(
        &mut self,
        parent: ObjectID,
        child: ObjectID,
        child_ty: &Type,
        child_ty_layout: &R::MoveTypeLayout,
        child_ty_fully_annotated_layout: &A::MoveTypeLayout,
        child_move_type: MoveObjectType,
    ) -> PartialVMResult<ObjectResult<(Type, MoveObjectType, GlobalValue)>> {
        let obj = match self.get_or_fetch_object_from_store(parent, child)? {
            None => {
                return Ok(ObjectResult::Loaded((
                    child_ty.clone(),
                    child_move_type,
                    GlobalValue::none(),
                )))
            }
            Some(obj) => obj,
        };
        // object exists, but the type does not match
        if obj.type_() != &child_move_type {
            return Ok(ObjectResult::MismatchedType);
        }
        // generate a GlobalValue
        let obj_contents = obj.contents();
        let v = match Value::simple_deserialize(obj_contents, child_ty_layout) {
            Some(v) => v,
            None => return Err(
                PartialVMError::new(StatusCode::FAILED_TO_DESERIALIZE_RESOURCE).with_message(
                    format!("Failed to deserialize object {child} with type {child_move_type}",),
                ),
            ),
        };
        let global_value =
            match GlobalValue::cached(v) {
                Ok(gv) => gv,
                Err(e) => {
                    return Err(PartialVMError::new(StatusCode::STORAGE_ERROR).with_message(
                        format!("Object {child} did not deserialize to a struct Value. Error: {e}"),
                    ))
                }
            };
        // Find all UIDs inside of the value and update the object parent maps
        let contained_uids =
            get_all_uids(child_ty_fully_annotated_layout, obj_contents).map_err(|e| {
                PartialVMError::new(StatusCode::UNKNOWN_INVARIANT_VIOLATION_ERROR)
                    .with_message(format!("Failed to find UIDs. ERROR: {e}"))
            })?;
        let parents_root_version = self.root_version.get(&parent).copied();
        if let Some(v) = parents_root_version {
            debug_assert!(contained_uids.contains(&child));
            for id in contained_uids {
                self.root_version.insert(id, v);
            }
        }
        Ok(ObjectResult::Loaded((
            child_ty.clone(),
            child_move_type,
            global_value,
        )))
    }
}

impl<'a> ObjectStore<'a> {
    pub(super) fn new(
        resolver: &'a dyn ChildObjectResolver,
        root_version: BTreeMap<ObjectID, SequenceNumber>,
        is_metered: bool,
        constants: LocalProtocolConfig,
        metrics: Arc<LimitsMetrics>,
    ) -> Self {
        Self {
            inner: Inner {
                resolver,
                root_version,
                cached_objects: BTreeMap::new(),
                is_metered,
                constants: constants.clone(),
                metrics,
            },
            store: BTreeMap::new(),
            is_metered,
            constants,
        }
    }

    pub(super) fn object_exists(
        &mut self,
        parent: ObjectID,
        child: ObjectID,
    ) -> PartialVMResult<bool> {
        if let Some(child_object) = self.store.get(&child) {
            return child_object.value.exists();
        }
        Ok(self
            .inner
            .get_or_fetch_object_from_store(parent, child)?
            .is_some())
    }

    pub(super) fn object_exists_and_has_type(
        &mut self,
        parent: ObjectID,
        child: ObjectID,
        child_move_type: &MoveObjectType,
    ) -> PartialVMResult<bool> {
        if let Some(child_object) = self.store.get(&child) {
            // exists and has same type
            return Ok(child_object.value.exists()? && &child_object.move_type == child_move_type);
        }
        Ok(self
            .inner
            .get_or_fetch_object_from_store(parent, child)?
            .map(|move_obj| move_obj.type_() == child_move_type)
            .unwrap_or(false))
    }

    pub(super) fn get_or_fetch_object(
        &mut self,
        parent: ObjectID,
        child: ObjectID,
        child_ty: &Type,
        child_layout: &R::MoveTypeLayout,
        child_fully_annotated_layout: &A::MoveTypeLayout,
        child_move_type: MoveObjectType,
    ) -> PartialVMResult<ObjectResult<&mut ChildObject>> {
        let store_entries_count = self.store.len() as u64;
        let child_object = match self.store.entry(child) {
            btree_map::Entry::Vacant(e) => {
                let (ty, move_type, value) = match self.inner.fetch_object_impl(
                    parent,
                    child,
                    child_ty,
                    child_layout,
                    child_fully_annotated_layout,
                    child_move_type,
                )? {
                    ObjectResult::MismatchedType => return Ok(ObjectResult::MismatchedType),
                    ObjectResult::Loaded(res) => res,
                };

                if let LimitThresholdCrossed::Hard(_, lim) = check_limit_by_meter!(
                    self.is_metered,
                    store_entries_count,
                    self.constants.object_runtime_max_num_store_entries,
                    self.constants
                        .object_runtime_max_num_store_entries_system_tx,
                    self.inner.metrics.excessive_object_runtime_store_entries
                ) {
                    return Err(PartialVMError::new(StatusCode::MEMORY_LIMIT_EXCEEDED)
                        .with_message(format!(
                            "Object runtime store limit ({} entries) reached",
                            lim
                        ))
                        .with_sub_status(
                            VMMemoryLimitExceededSubStatusCode::OBJECT_RUNTIME_STORE_LIMIT_EXCEEDED
                                as u64,
                        ));
                };

                e.insert(ChildObject {
                    owner: parent,
                    ty,
                    move_type,
                    value,
                })
            }
            btree_map::Entry::Occupied(e) => {
                let child_object = e.into_mut();
                if child_object.move_type != child_move_type {
                    return Ok(ObjectResult::MismatchedType);
                }
                child_object
            }
        };
        Ok(ObjectResult::Loaded(child_object))
    }

    pub(super) fn add_object(
        &mut self,
        parent: ObjectID,
        child: ObjectID,
        child_ty: &Type,
        child_move_type: MoveObjectType,
        child_value: Value,
    ) -> PartialVMResult<()> {
        let mut child_object = ChildObject {
            owner: parent,
            ty: child_ty.clone(),
            move_type: child_move_type,
            value: GlobalValue::none(),
        };
        child_object.value.move_to(child_value).unwrap();

        if let LimitThresholdCrossed::Hard(_, lim) = check_limit_by_meter!(
            self.is_metered,
            self.store.len(),
            self.constants.object_runtime_max_num_store_entries,
            self.constants
                .object_runtime_max_num_store_entries_system_tx,
            self.inner.metrics.excessive_object_runtime_store_entries
        ) {
            return Err(PartialVMError::new(StatusCode::MEMORY_LIMIT_EXCEEDED)
                .with_message(format!(
                    "Object runtime store limit ({} entries) reached",
                    lim
                ))
                .with_sub_status(
                    VMMemoryLimitExceededSubStatusCode::OBJECT_RUNTIME_STORE_LIMIT_EXCEEDED as u64,
                ));
        };

        if let Some(prev) = self.store.insert(child, child_object) {
            if prev.value.exists()? {
                return Err(
                    PartialVMError::new(StatusCode::UNKNOWN_INVARIANT_VIOLATION_ERROR)
                        .with_message(
                            "Duplicate addition of a child object. \
                            The previous value cannot be dropped. Indicates possible duplication \
                            of objects as an object was fetched more than once from two different \
                            parents, yet was not removed from one first"
                                .to_string(),
                        ),
                );
            }
        }
        Ok(())
    }

    pub(super) fn cached_objects(&self) -> &BTreeMap<ObjectID, Option<Object>> {
        &self.inner.cached_objects
    }

    // retrieve the `Op` effects for the child objects
    pub(super) fn take_effects(
        &mut self,
    ) -> (
        BTreeMap<ObjectID, SequenceNumber>,
        BTreeMap<ObjectID, ChildObjectEffect>,
    ) {
        let loaded_versions: BTreeMap<ObjectID, SequenceNumber> = self
            .inner
            .cached_objects
            .iter()
            .filter_map(|(id, obj_opt)| Some((*id, obj_opt.as_ref()?.version())))
            .collect();
        let child_object_effects = std::mem::take(&mut self.store)
            .into_iter()
            .filter_map(|(id, child_object)| {
                let ChildObject {
                    owner,
                    ty,
                    move_type: _,
                    value,
                } = child_object;
                let loaded_version = loaded_versions.get(&id).copied();
                let effect = value.into_effect()?;
                let child_effect = ChildObjectEffect {
                    owner,
                    loaded_version,
                    ty,
                    effect,
                };
                Some((id, child_effect))
            })
            .collect();
        (loaded_versions, child_object_effects)
    }

    pub(super) fn all_active_objects(&self) -> impl Iterator<Item = (&ObjectID, &Type, Value)> {
        self.store.iter().filter_map(|(id, child_object)| {
            let child_exists = child_object.value.exists().unwrap();
            if !child_exists {
                None
            } else {
                let copied_child_value = child_object
                    .value
                    .borrow_global()
                    .unwrap()
                    .value_as::<StructRef>()
                    .unwrap()
                    .read_ref()
                    .unwrap();
                Some((id, &child_object.ty, copied_child_value))
            }
        })
    }
}