Add asset system with file locking and atomic writes

1 files changed, 106 insertions, 0 deletions

diff --git a/systems/asset/src/error.rs b/systems/asset/src/error.rs
new file mode 100644
index 0000000..5dc529f
--- /dev/null
+++ b/systems/asset/src/error.rs
@@ -0,0 +1,106 @@
+use std::path::PathBuf;
+
+#[derive(Debug, thiserror::Error)]
+pub enum DataReadError {
+    #[error("IO error: {0}")]
+    IoError(#[from] std::io::Error),
+
+    #[error("Parse error: {0}")]
+    ParseError(String),
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum DataWriteError {
+    #[error("IO error: {0}")]
+    IoError(#[from] std::io::Error),
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum DataApplyError {
+    #[error("IO error: {0}")]
+    IoError(#[from] std::io::Error),
+
+    #[error("Asset file not found: {0}")]
+    AssetFileNotFound(PathBuf),
+
+    #[error("Pre-check failed: {0}")]
+    PrecheckFailed(#[from] PrecheckFailed),
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum PrecheckFailed {
+    /// Lock file does not exist
+    /// Means trying to apply a modification that cannot be applied
+    #[error("Lock not found")]
+    LockNotFound,
+
+    /// Asset file does not exist
+    /// Apply phase will fail due to this condition
+    #[error("Asset not found")]
+    AssetNotFound,
+
+    // Note: !writed is allowed,
+    // but writed without a TEMP_FILE is not allowed
+    /// Handle produced a write
+    /// but the temporary file does not exist, indicating an abnormal write operation
+    #[error("Temp not found")]
+    WritedButTempNotFound,
+
+    /// Asset path is invalid
+    /// This is not an issue that should arise from normal Handle creation flow
+    #[error("Asset path invalid")]
+    AssetPathInvalid,
+
+    /// Temporary file cannot be moved
+    #[error("Temp file not moveable")]
+    TempNotMoveable,
+
+    /// Asset file cannot be moved
+    #[error("Asset file not writable")]
+    AssetNotWritable,
+
+    /// Handle is processing a cross-directory operation
+    /// This is not atomic
+    #[error("Handle is cross-directory")]
+    HandleIsCrossDirectory,
+
+    /// Asset file has no parent directory
+    /// This is not a valid path for file operations
+    #[error("Asset file has no parent directory")]
+    HandleFileIsNoParent,
+
+    /// A handle with the same path already exists
+    /// This operation will cause a conflict
+    #[error("Handle with same path exists")]
+    HasSamePath,
+
+    #[error("Lock on lock file")]
+    LockOnLockFile,
+
+    #[error("Temp file for temp file")]
+    TempForTempFile,
+
+    #[error("Asset path cannot be formatted")]
+    FormatPathFailed,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum HandleLockError {
+    #[error("Parse path failed")]
+    ParsePathFailed,
+
+    #[error("Asset file not found")]
+    AssetFileNotFound(PathBuf),
+
+    #[error("Read file name failed")]
+    ReadFileNameFailed,
+
+    #[error("Asset locked")]
+    AssetLocked,
+
+    #[error("IO error: {0}")]
+    IoError(#[from] std::io::Error),
+
+    #[error("Pre-check failed: {0}")]
+    PrecheckFailed(#[from] PrecheckFailed),
+}