milenkovicm commented on code in PR #19079: URL: https://github.com/apache/datafusion/pull/19079#discussion_r2595381099
########## datafusion/ffi/src/proto/physical_extension_codec.rs: ########## @@ -0,0 +1,701 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::ffi::c_void; +use std::sync::Arc; + +use abi_stable::std_types::{RResult, RSlice, RStr, RVec}; +use abi_stable::StableAbi; +use async_trait::async_trait; +use datafusion_common::error::Result; +use datafusion_execution::TaskContext; +use datafusion_expr::{ + AggregateUDF, AggregateUDFImpl, ScalarUDF, ScalarUDFImpl, WindowUDF, WindowUDFImpl, +}; +use datafusion_physical_plan::ExecutionPlan; +use datafusion_proto::physical_plan::PhysicalExtensionCodec; +use tokio::runtime::Handle; + +use crate::execution::FFI_TaskContextProvider; +use crate::execution_plan::FFI_ExecutionPlan; +use crate::udaf::FFI_AggregateUDF; +use crate::udf::FFI_ScalarUDF; +use crate::udwf::FFI_WindowUDF; +use crate::util::FFIResult; +use crate::{df_result, rresult_return}; + +/// A stable struct for sharing [`PhysicalExtensionCodec`] across FFI boundaries. +#[repr(C)] +#[derive(Debug, StableAbi)] +#[allow(non_camel_case_types)] +pub struct FFI_PhysicalExtensionCodec { + /// Decode bytes into an execution plan. + try_decode: unsafe extern "C" fn( + &Self, + buf: RSlice<u8>, + inputs: RVec<FFI_ExecutionPlan>, + ) -> FFIResult<FFI_ExecutionPlan>, + + /// Encode an execution plan into bytes. + try_encode: + unsafe extern "C" fn(&Self, node: FFI_ExecutionPlan) -> FFIResult<RVec<u8>>, + + /// Decode bytes into a user defined scalar function. + try_decode_udf: unsafe extern "C" fn( + &Self, + name: RStr, + buf: RSlice<u8>, + ) -> FFIResult<FFI_ScalarUDF>, + + /// Encode a user defined scalar function into bytes. + try_encode_udf: + unsafe extern "C" fn(&Self, node: FFI_ScalarUDF) -> FFIResult<RVec<u8>>, + + /// Decode bytes into a user defined aggregate function. + try_decode_udaf: unsafe extern "C" fn( + &Self, + name: RStr, + buf: RSlice<u8>, + ) -> FFIResult<FFI_AggregateUDF>, + + /// Encode a user defined aggregate function into bytes. + try_encode_udaf: + unsafe extern "C" fn(&Self, node: FFI_AggregateUDF) -> FFIResult<RVec<u8>>, + + /// Decode bytes into a user defined window function. + try_decode_udwf: unsafe extern "C" fn( + &Self, + name: RStr, + buf: RSlice<u8>, + ) -> FFIResult<FFI_WindowUDF>, + + /// Encode a user defined window function into bytes. + try_encode_udwf: + unsafe extern "C" fn(&Self, node: FFI_WindowUDF) -> FFIResult<RVec<u8>>, + + /// Access the current [`TaskContext`]. + task_ctx_provider: FFI_TaskContextProvider, + + /// Used to create a clone on the provider of the execution plan. This should + /// only need to be called by the receiver of the plan. + pub clone: unsafe extern "C" fn(plan: &Self) -> Self, + + /// Release the memory of the private data when it is no longer being used. + pub release: unsafe extern "C" fn(arg: &mut Self), + + /// Return the major DataFusion version number of this provider. + pub version: unsafe extern "C" fn() -> u64, + + /// Internal data. This is only to be accessed by the provider of the plan. + /// A [`ForeignPhysicalExtensionCodec`] should never attempt to access this data. + pub private_data: *mut c_void, + + /// Utility to identify when FFI objects are accessed locally through + /// the foreign interface. + pub library_marker_id: extern "C" fn() -> usize, +} + +unsafe impl Send for FFI_PhysicalExtensionCodec {} +unsafe impl Sync for FFI_PhysicalExtensionCodec {} + +struct PhysicalExtensionCodecPrivateData { + provider: Arc<dyn PhysicalExtensionCodec>, + runtime: Option<Handle>, +} + +impl FFI_PhysicalExtensionCodec { + fn inner(&self) -> &Arc<dyn PhysicalExtensionCodec> { + let private_data = self.private_data as *const PhysicalExtensionCodecPrivateData; + unsafe { &(*private_data).provider } + } + + fn runtime(&self) -> &Option<Handle> { + let private_data = self.private_data as *const PhysicalExtensionCodecPrivateData; + unsafe { &(*private_data).runtime } + } +} + +unsafe extern "C" fn try_decode_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + buf: RSlice<u8>, + inputs: RVec<FFI_ExecutionPlan>, +) -> FFIResult<FFI_ExecutionPlan> { + let task_ctx: Arc<TaskContext> = + rresult_return!((&codec.task_ctx_provider).try_into()); + let codec = codec.inner(); + let inputs = inputs + .into_iter() + .map(|plan| <Arc<dyn ExecutionPlan>>::try_from(&plan)) + .collect::<Result<Vec<_>>>(); + let inputs = rresult_return!(inputs); + + let plan = + rresult_return!(codec.try_decode(buf.as_ref(), &inputs, task_ctx.as_ref())); + + RResult::ROk(FFI_ExecutionPlan::new(plan, task_ctx, None)) +} + +unsafe extern "C" fn try_encode_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + node: FFI_ExecutionPlan, +) -> FFIResult<RVec<u8>> { + let codec = codec.inner(); + + let plan: Arc<dyn ExecutionPlan> = rresult_return!((&node).try_into()); + + let mut bytes = Vec::new(); + rresult_return!(codec.try_encode(plan, &mut bytes)); + + RResult::ROk(bytes.into()) +} + +unsafe extern "C" fn try_decode_udf_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + name: RStr, + buf: RSlice<u8>, +) -> FFIResult<FFI_ScalarUDF> { + let codec = codec.inner(); + + let udf = rresult_return!(codec.try_decode_udf(name.as_str(), buf.as_ref())); + let udf = FFI_ScalarUDF::from(udf); + + RResult::ROk(udf) +} + +unsafe extern "C" fn try_encode_udf_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + node: FFI_ScalarUDF, +) -> FFIResult<RVec<u8>> { + let codec = codec.inner(); + let node: Arc<dyn ScalarUDFImpl> = (&node).into(); + let node = ScalarUDF::new_from_shared_impl(node); + + let mut bytes = Vec::new(); + rresult_return!(codec.try_encode_udf(&node, &mut bytes)); + + RResult::ROk(bytes.into()) +} + +unsafe extern "C" fn try_decode_udaf_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + name: RStr, + buf: RSlice<u8>, +) -> FFIResult<FFI_AggregateUDF> { + let codec_inner = codec.inner(); + let udaf = rresult_return!(codec_inner.try_decode_udaf(name.into(), buf.as_ref())); + let udaf = FFI_AggregateUDF::from(udaf); + + RResult::ROk(udaf) +} + +unsafe extern "C" fn try_encode_udaf_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + node: FFI_AggregateUDF, +) -> FFIResult<RVec<u8>> { + let codec = codec.inner(); + let udaf: Arc<dyn AggregateUDFImpl> = (&node).into(); + let udaf = AggregateUDF::new_from_shared_impl(udaf); + + let mut bytes = Vec::new(); + rresult_return!(codec.try_encode_udaf(&udaf, &mut bytes)); + + RResult::ROk(bytes.into()) +} + +unsafe extern "C" fn try_decode_udwf_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + name: RStr, + buf: RSlice<u8>, +) -> FFIResult<FFI_WindowUDF> { + let codec = codec.inner(); + let udwf = rresult_return!(codec.try_decode_udwf(name.into(), buf.as_ref())); + let udwf = FFI_WindowUDF::from(udwf); + + RResult::ROk(udwf) +} + +unsafe extern "C" fn try_encode_udwf_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, + node: FFI_WindowUDF, +) -> FFIResult<RVec<u8>> { + let codec = codec.inner(); + let udwf: Arc<dyn WindowUDFImpl> = (&node).into(); + let udwf = WindowUDF::new_from_shared_impl(udwf); + + let mut bytes = Vec::new(); + rresult_return!(codec.try_encode_udwf(&udwf, &mut bytes)); + + RResult::ROk(bytes.into()) +} + +unsafe extern "C" fn release_fn_wrapper(provider: &mut FFI_PhysicalExtensionCodec) { + let private_data = + Box::from_raw(provider.private_data as *mut PhysicalExtensionCodecPrivateData); + drop(private_data); +} + +unsafe extern "C" fn clone_fn_wrapper( + codec: &FFI_PhysicalExtensionCodec, +) -> FFI_PhysicalExtensionCodec { + let old_codec = Arc::clone(codec.inner()); + let runtime = codec.runtime().clone(); + + FFI_PhysicalExtensionCodec::new(old_codec, runtime, codec.task_ctx_provider.clone()) +} + +impl Drop for FFI_PhysicalExtensionCodec { + fn drop(&mut self) { + unsafe { (self.release)(self) } + } +} + +impl FFI_PhysicalExtensionCodec { + /// Creates a new [`FFI_PhysicalExtensionCodec`]. + pub fn new( + provider: Arc<dyn PhysicalExtensionCodec + Send>, + runtime: Option<Handle>, + task_ctx_provider: impl Into<FFI_TaskContextProvider>, + ) -> Self { + let task_ctx_provider = task_ctx_provider.into(); + let private_data = + Box::new(PhysicalExtensionCodecPrivateData { provider, runtime }); + + Self { + try_decode: try_decode_fn_wrapper, + try_encode: try_encode_fn_wrapper, + try_decode_udf: try_decode_udf_fn_wrapper, + try_encode_udf: try_encode_udf_fn_wrapper, + try_decode_udaf: try_decode_udaf_fn_wrapper, + try_encode_udaf: try_encode_udaf_fn_wrapper, + try_decode_udwf: try_decode_udwf_fn_wrapper, + try_encode_udwf: try_encode_udwf_fn_wrapper, + task_ctx_provider, + + clone: clone_fn_wrapper, + release: release_fn_wrapper, + version: crate::version, + private_data: Box::into_raw(private_data) as *mut c_void, + library_marker_id: crate::get_library_marker_id, + } + } +} + +/// This wrapper struct exists on the receiver side of the FFI interface, so it has +/// no guarantees about being able to access the data in `private_data`. Any functions +/// defined on this struct must only use the stable functions provided in +/// FFI_PhysicalExtensionCodec to interact with the foreign table provider. +#[derive(Debug)] +pub struct ForeignPhysicalExtensionCodec(pub FFI_PhysicalExtensionCodec); + +unsafe impl Send for ForeignPhysicalExtensionCodec {} +unsafe impl Sync for ForeignPhysicalExtensionCodec {} + +impl From<&FFI_PhysicalExtensionCodec> for Arc<dyn PhysicalExtensionCodec> { + fn from(provider: &FFI_PhysicalExtensionCodec) -> Self { + if (provider.library_marker_id)() == crate::get_library_marker_id() { + Arc::clone(provider.inner()) + } else { + Arc::new(ForeignPhysicalExtensionCodec(provider.clone())) + } + } +} + +impl Clone for FFI_PhysicalExtensionCodec { + fn clone(&self) -> Self { + unsafe { (self.clone)(self) } + } +} + +#[async_trait] Review Comment: I would say `async_trait` is not needed here -- This is an automated message from the Apache Git Service. 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