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authorDeterminant <[email protected]>2020-06-10 14:40:36 -0400
committerDeterminant <[email protected]>2020-06-10 14:40:36 -0400
commit415578aa48a12cac01d763b7c08384dbcd46911b (patch)
treec01d7e28e38caac6662215469a172dd99f576654 /tests/common
parent81eb9ce9299b2e31471db3f00457ff3c1a41fb60 (diff)
WIP: random failure test (with emulated storage)
Diffstat (limited to 'tests/common')
-rw-r--r--tests/common/mod.rs117
1 files changed, 117 insertions, 0 deletions
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
new file mode 100644
index 0000000..fd98539
--- /dev/null
+++ b/tests/common/mod.rs
@@ -0,0 +1,117 @@
+#[cfg(test)]
+#[allow(dead_code)]
+
+extern crate growthring;
+use growthring::wal::{WALFile, WALStore, WALPos, WALBytes};
+use std::collections::{HashMap, hash_map::Entry};
+use std::cell::RefCell;
+use std::rc::Rc;
+
+/*
+thread_local! {
+ //pub static RNG: RefCell<rand::rngs::StdRng> = RefCell::new(<rand::rngs::StdRng as rand::SeedableRng>::from_seed([0; 32]));
+ pub static RNG: RefCell<rand::rngs::ThreadRng> = RefCell::new(rand::thread_rng());
+}
+
+pub fn gen_rand_letters(i: usize) -> String {
+ //let mut rng = rand::thread_rng();
+ RNG.with(|rng| {
+ (0..i).map(|_| (rng.borrow_mut().gen::<u8>() % 26 + 'a' as u8) as char).collect()
+ })
+}
+*/
+
+struct FileContentEmul(RefCell<Vec<u8>>);
+
+impl FileContentEmul {
+ pub fn new() -> Self { FileContentEmul(RefCell::new(Vec::new())) }
+}
+
+impl std::ops::Deref for FileContentEmul {
+ type Target = RefCell<Vec<u8>>;
+ fn deref(&self) -> &Self::Target {&self.0}
+}
+
+/// Emulate the a virtual file handle.
+pub struct WALFileEmul {
+ file: Rc<FileContentEmul>
+}
+
+impl WALFile for WALFileEmul {
+ fn allocate(&self, offset: WALPos, length: usize) -> Result<(), ()> {
+ let offset = offset as usize;
+ if offset + length > self.file.borrow().len() {
+ self.file.borrow_mut().resize(offset + length, 0)
+ }
+ for v in &mut self.file.borrow_mut()[offset..offset + length] { *v = 0 }
+ Ok(())
+ }
+
+ fn truncate(&self, length: usize) -> Result<(), ()> {
+ self.file.borrow_mut().resize(length, 0);
+ Ok(())
+ }
+
+ fn write(&self, offset: WALPos, data: WALBytes) {
+ let offset = offset as usize;
+ &self.file.borrow_mut()[offset..offset + data.len()].copy_from_slice(&data);
+ }
+
+ fn read(&self, offset: WALPos, length: usize) -> Option<WALBytes> {
+ let offset = offset as usize;
+ let file = self.file.borrow();
+ if offset + length > file.len() { None }
+ else {
+ Some((&file[offset..offset + length]).to_vec().into_boxed_slice())
+ }
+ }
+}
+
+pub struct WALStoreEmulState{
+ files: HashMap<String, Rc<FileContentEmul>>,
+}
+
+impl WALStoreEmulState {
+ pub fn new() -> Self { WALStoreEmulState { files: HashMap::new() } }
+}
+
+/// Emulate the persistent storage state.
+pub struct WALStoreEmul<'a>(&'a mut WALStoreEmulState);
+
+impl<'a> WALStoreEmul<'a> {
+ pub fn new(state: &'a mut WALStoreEmulState) -> Self {
+ WALStoreEmul(state)
+ }
+}
+
+impl<'a> WALStore for WALStoreEmul<'a> {
+ type FileNameIter = std::vec::IntoIter<String>;
+
+ fn open_file(&mut self, filename: &str, touch: bool) -> Option<Box<dyn WALFile>> {
+ match self.0.files.entry(filename.to_string()) {
+ Entry::Occupied(e) => Some(Box::new(WALFileEmul { file: e.get().clone() })),
+ Entry::Vacant(e) => if touch {
+ Some(Box::new(
+ WALFileEmul { file: e.insert(Rc::new(FileContentEmul::new())).clone() }))
+ } else {
+ None
+ }
+ }
+ }
+
+ fn remove_file(&mut self, filename: &str) -> Result<(), ()> {
+ self.0.files.remove(filename).ok_or(()).and_then(|_| Ok(()))
+ }
+
+ fn enumerate_files(&self) -> Self::FileNameIter {
+ let mut logfiles = Vec::new();
+ for (fname, _) in self.0.files.iter() {
+ logfiles.push(fname.clone())
+ }
+ logfiles.into_iter()
+ }
+
+ fn apply_payload(&mut self, payload: WALBytes) {
+ println!("apply_payload(payload={})", std::str::from_utf8(&payload).unwrap())
+ }
+}