// Copyright 2023 The Jujutsu Authors//// Licensed 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//// https://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::any::Any;use std::collections::HashMap;use std::fmt::Debug;use std::fmt::Error;use std::fmt::Formatter;use std::io::Cursor;use std::path::Path;use std::path::PathBuf;use std::pin::Pin;use std::sync::Arc;use std::sync::Mutex;use std::sync::MutexGuard;use std::time::SystemTime; use async_trait::async_trait;use futures::stream;use futures::stream::BoxStream;use jj_lib::backend::make_root_commit;use jj_lib::backend::Backend;use jj_lib::backend::BackendError;use jj_lib::backend::BackendResult;use jj_lib::backend::ChangeId;use jj_lib::backend::Commit;use jj_lib::backend::CommitId;use jj_lib::backend::Conflict;use jj_lib::backend::ConflictId;use jj_lib::backend::CopyHistory;use jj_lib::backend::CopyId;use jj_lib::backend::CopyRecord;use jj_lib::backend::FileId;use jj_lib::backend::SecureSig;use jj_lib::backend::SigningFn;use jj_lib::backend::SymlinkId;use jj_lib::backend::Tree;use jj_lib::backend::TreeId;use jj_lib::dag_walk::topo_order_reverse;use jj_lib::index::Index;use jj_lib::object_id::ObjectId as _;use jj_lib::repo_path::RepoPath;use jj_lib::repo_path::RepoPathBuf;use tokio::io::AsyncRead;use tokio::io::AsyncReadExt as _;use tokio::runtime::Runtime; const HASH_LENGTH: usize = 10;const CHANGE_ID_LENGTH: usize = 16; // Keyed by canonical store path. Since we just use the path as a key, we can't// rely on on the file system to resolve two different uncanonicalized paths to// the same real path (as we would if we just used the path with `std::fs`// functions).type TestBackendDataMap = HashMap<PathBuf, Arc<Mutex<TestBackendData>>>; #[derive(Default)]pub struct TestBackendData {    commits: HashMap<CommitId, Commit>,    trees: HashMap<RepoPathBuf, HashMap<TreeId, Tree>>,    files: HashMap<RepoPathBuf, HashMap<FileId, Vec<u8>>>,    symlinks: HashMap<RepoPathBuf, HashMap<SymlinkId, String>>,    conflicts: HashMap<RepoPathBuf, HashMap<ConflictId, Conflict>>,    copies: HashMap<CopyId, CopyHistory>,} #[derive(Clone, Default)]pub struct TestBackendFactory {    backend_data: Arc<Mutex<TestBackendDataMap>>,} impl TestBackendFactory {    pub fn init(&self, store_path: &Path) -> TestBackend {        let data = Arc::new(Mutex::new(TestBackendData::default()));        self.backend_data            .lock()            .unwrap()            .insert(store_path.canonicalize().unwrap(), data.clone());        TestBackend::with_data(data)    }     pub fn load(&self, store_path: &Path) -> TestBackend {        let data = self            .backend_data            .lock()            .unwrap()            .get(&store_path.canonicalize().unwrap())            .unwrap()            .clone();        TestBackend::with_data(data)    }} impl Debug for TestBackendFactory {    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {        f.debug_struct("TestBackendFactory").finish_non_exhaustive()    }} fn get_hash(content: &(impl jj_lib::content_hash::ContentHash + ?Sized)) -> Vec<u8> {    jj_lib::content_hash::blake2b_hash(content).as_slice()[..HASH_LENGTH].to_vec()} /// A commit backend for use in tests.////// It's meant to be strict, in order to catch bugs where we make the/// wrong assumptions. For example, unlike both `GitBackend` and/// `SimpleBackend`, this backend doesn't share objects written to/// different paths (writing a file with contents X to path A will not/// make it possible to read that contents from path B given the same/// `FileId`).pub struct TestBackend {    root_commit_id: CommitId,    root_change_id: ChangeId,    empty_tree_id: TreeId,    data: Arc<Mutex<TestBackendData>>,    runtime: Runtime,} impl TestBackend {    pub fn with_data(data: Arc<Mutex<TestBackendData>>) -> Self {        let root_commit_id = CommitId::from_bytes(&[0; HASH_LENGTH]);        let root_change_id = ChangeId::from_bytes(&[0; CHANGE_ID_LENGTH]);        let empty_tree_id = TreeId::new(get_hash(&Tree::default()));        let runtime = Runtime::new().unwrap();         TestBackend {            root_commit_id,            root_change_id,            empty_tree_id,            data,            runtime,        }    }     fn locked_data(&self) -> MutexGuard<'_, TestBackendData> {        self.data.lock().unwrap()    }     pub fn remove_commit_unchecked(&self, id: &CommitId) {        self.locked_data().commits.remove(id);    }     async fn run_async<R: Send + 'static>(        &self,        process: impl FnOnce(MutexGuard<TestBackendData>) -> R + Send + 'static,    ) -> R {        let data = self.data.clone();        self.runtime            .spawn(async move { process(data.lock().unwrap()) })            .await            .unwrap()    }} impl Debug for TestBackend {    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {        f.debug_struct("TestBackend").finish_non_exhaustive()    }} #[async_trait]impl Backend for TestBackend {    fn as_any(&self) -> &dyn Any {        self    }     fn name(&self) -> &str {        "test"    }     fn commit_id_length(&self) -> usize {        HASH_LENGTH    }     fn change_id_length(&self) -> usize {        CHANGE_ID_LENGTH    }     fn root_commit_id(&self) -> &CommitId {        &self.root_commit_id    }     fn root_change_id(&self) -> &ChangeId {        &self.root_change_id    }     fn empty_tree_id(&self) -> &TreeId {        &self.empty_tree_id    }     fn concurrency(&self) -> usize {        // Not optimal, just for testing the async code more        10    }     async fn read_file(        &self,        path: &RepoPath,        id: &FileId,    ) -> BackendResult<Pin<Box<dyn AsyncRead + Send>>> {        let path = path.to_owned();        let id = id.clone();        self.run_async(move |data| {            match data                .files                .get(&path)                .and_then(|items| items.get(&id))                .cloned()            {                None => Err(BackendError::ObjectNotFound {                    object_type: "file".to_string(),                    hash: id.hex(),                    source: format!("at path {path:?}").into(),                }),                Some(contents) => {                    let reader: Pin<Box<dyn AsyncRead + Send>> = Box::pin(Cursor::new(contents));                    Ok(reader)                }            }        })        .await    }     async fn write_file(        &self,        path: &RepoPath,        contents: &mut (dyn AsyncRead + Send + Unpin),    ) -> BackendResult<FileId> {        let path = path.to_owned();        let mut bytes = Vec::new();        contents.read_to_end(&mut bytes).await.unwrap();        self.run_async(move |mut data| {            let id = FileId::new(get_hash(&bytes));            data.files                .entry(path.clone())                .or_default()                .insert(id.clone(), bytes);            Ok(id)        })        .await    }     async fn read_symlink(&self, path: &RepoPath, id: &SymlinkId) -> BackendResult<String> {        let path = path.to_owned();        let id = id.clone();        self.run_async(move |data| {            match data                .symlinks                .get(&path)                .and_then(|items| items.get(&id))                .cloned()            {                None => Err(BackendError::ObjectNotFound {                    object_type: "symlink".to_string(),                    hash: id.hex(),                    source: format!("at path {path:?}").into(),                }),                Some(target) => Ok(target),            }        })        .await    }     async fn write_symlink(&self, path: &RepoPath, target: &str) -> BackendResult<SymlinkId> {        let id = SymlinkId::new(get_hash(target.as_bytes()));        let path = path.to_owned();        let target = target.to_owned();        self.run_async(move |mut data| {            data.symlinks                .entry(path)                .or_default()                .insert(id.clone(), target);            Ok(id)        })        .await    }     async fn read_copy(&self, id: &CopyId) -> BackendResult<CopyHistory> {        let id = id.clone();        self.run_async(move |data| {            let copy =                data.copies                    .get(&id)                    .cloned()                    .ok_or_else(|| BackendError::ObjectNotFound {                        object_type: "copy".to_string(),                        hash: id.hex(),                        source: "".into(),                    })?;            Ok(copy)        })        .await    }     async fn write_copy(&self, contents: &CopyHistory) -> BackendResult<CopyId> {        let contents = contents.clone();        self.run_async(move |mut data| {            let id = CopyId::new(get_hash(&contents));            data.copies.insert(id.clone(), contents);            Ok(id)        })        .await    }     async fn get_related_copies(&self, copy_id: &CopyId) -> BackendResult<Vec<CopyHistory>> {        let copy_id = copy_id.clone();        self.run_async(move |data| {            let copies = &data.copies;            if !copies.contains_key(&copy_id) {                return Err(BackendError::ObjectNotFound {                    object_type: "copy history".to_string(),                    hash: copy_id.hex(),                    source: "".into(),                });            }            // Return all copy histories to test that the caller correctly ignores histories            // that are not relevant to the trees they're working with.            let mut histories = vec![];            for id in topo_order_reverse(                copies.keys(),                |id| *id,                |id| copies.get(*id).unwrap().parents.iter(),            ) {                histories.push(copies.get(id).unwrap().clone());            }            Ok(histories)        })        .await    }     async fn read_tree(&self, path: &RepoPath, id: &TreeId) -> BackendResult<Tree> {        if id == &self.empty_tree_id {            return Ok(Tree::default());        }        let path = path.to_owned();        let id = id.clone();        self.run_async(move |data| {            match data                .trees                .get(&path)                .and_then(|items| items.get(&id))                .cloned()            {                None => Err(BackendError::ObjectNotFound {                    object_type: "tree".to_string(),                    hash: id.hex(),                    source: format!("at path {path:?}").into(),                }),                Some(tree) => Ok(tree),            }        })        .await    }     async fn write_tree(&self, path: &RepoPath, contents: &Tree) -> BackendResult<TreeId> {        let path = path.to_owned();        let contents = contents.clone();        self.run_async(move |mut data| {            let id = TreeId::new(get_hash(&contents));            data.trees                .entry(path.clone())                .or_default()                .insert(id.clone(), contents.clone());            Ok(id)        })        .await    }     fn read_conflict(&self, path: &RepoPath, id: &ConflictId) -> BackendResult<Conflict> {        match self            .locked_data()            .conflicts            .get(path)            .and_then(|items| items.get(id))            .cloned()        {            None => Err(BackendError::ObjectNotFound {                object_type: "conflict".to_string(),                hash: id.hex(),                source: format!("at path {path:?}").into(),            }),            Some(conflict) => Ok(conflict),        }    }     fn write_conflict(&self, path: &RepoPath, contents: &Conflict) -> BackendResult<ConflictId> {        let id = ConflictId::new(get_hash(contents));        self.locked_data()            .conflicts            .entry(path.to_owned())            .or_default()            .insert(id.clone(), contents.clone());        Ok(id)    }     async fn read_commit(&self, id: &CommitId) -> BackendResult<Commit> {        if id == &self.root_commit_id {            return Ok(make_root_commit(                self.root_change_id.clone(),                self.empty_tree_id.clone(),            ));        }        let id = id.clone();        self.run_async(move |data| match data.commits.get(&id).cloned() {            None => Err(BackendError::ObjectNotFound {                object_type: "commit".to_string(),                hash: id.hex(),                source: "".into(),            }),            Some(commit) => Ok(commit),        })        .await    }     async fn write_commit(        &self,        mut contents: Commit,        mut sign_with: Option<&mut SigningFn>,    ) -> BackendResult<(CommitId, Commit)> {        assert!(contents.secure_sig.is_none(), "commit.secure_sig was set");         if let Some(sign) = &mut sign_with {            let data = format!("{contents:?}").into_bytes();            let sig = sign(&data).map_err(|err| BackendError::Other(Box::new(err)))?;            contents.secure_sig = Some(SecureSig { data, sig });        }         self.run_async(move |mut data| {            let id = CommitId::new(get_hash(&contents));            data.commits.insert(id.clone(), contents.clone());            Ok((id, contents))        })        .await    }     fn get_copy_records(        &self,        _paths: Option<&[RepoPathBuf]>,        _root: &CommitId,        _head: &CommitId,    ) -> BackendResult<BoxStream<'_, BackendResult<CopyRecord>>> {        Ok(Box::pin(stream::empty()))    }     fn gc(&self, _index: &dyn Index, _keep_newer: SystemTime) -> BackendResult<()> {        Ok(())    }} #[cfg(test)]mod tests {     use pollster::FutureExt as _;     use super::*;    use crate::repo_path_buf;     fn copy_history(path: &str, parents: &[CopyId]) -> CopyHistory {        CopyHistory {            current_path: repo_path_buf(path),            parents: parents.to_vec(),            salt: vec![],        }    }     #[test]    fn get_related_copies() {        let backend = TestBackend::with_data(Arc::new(Mutex::new(TestBackendData::default())));         // Test with a single chain so the resulting order is deterministic        let copy1 = copy_history("foo1", &[]);        let copy1_id = backend.write_copy(&copy1).block_on().unwrap();        let copy2 = copy_history("foo2", std::slice::from_ref(&copy1_id));        let copy2_id = backend.write_copy(&copy2).block_on().unwrap();        let copy3 = copy_history("foo3", std::slice::from_ref(&copy2_id));        let copy3_id = backend.write_copy(&copy3).block_on().unwrap();         // Error when looking up by non-existent id        assert!(backend            .get_related_copies(&CopyId::from_hex("abcd"))            .block_on()            .is_err());         // Looking up by any id returns the related copies in the same order (children        // before parents)        let related = backend.get_related_copies(&copy1_id).block_on().unwrap();        assert_eq!(related, vec![copy3.clone(), copy2.clone(), copy1.clone()]);        let related: Vec<CopyHistory> = backend.get_related_copies(&copy3_id).block_on().unwrap();

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