refactor(fspy): use shared memory IPC on Windows

[branchseer]

TL;DR

Replaced Windows pipe-based IPC with shared memory for file system access tracking, unifying the approach across platforms.

What changed?

• Replaced Windows named pipe IPC with shared memory for tracking file system accesses
• Created a new ipc.rs module with common code for both Windows and Unix platforms
• Extracted OwnedReceiverLockGuard from Unix implementation to be reused on Windows
• Removed dependency on dashmap which was used for the previous Windows implementation
• Added write_encoded method to ShmWriter to directly encode values into shared memory
• Updated Windows payload structure to use ChannelConf instead of pipe handles

Why make this change?

The previous implementation used different IPC mechanisms on Windows (named pipes) and Unix (shared memory). This change unifies the approach across platforms, making the code more maintainable and consistent. Shared memory is more efficient for passing large amounts of data between processes, which is important for tracking file system accesses in complex applications. The unified approach also simplifies the codebase by removing platform-specific code paths and dependencies.

[branchseer]

• chore(fspy): remove ignoring Chromium processes #249
• refactor(fspy): use shared memory IPC on Windows #239 👈 (View in Graphite)
• fix(task): use shared memory for fspy ipc #234
• test: add test for vitest browser mode #235
• main

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[Copilot]

Pull Request Overview

This PR refactors the Windows IPC mechanism for file system access tracking to use shared memory instead of named pipes, aligning it with the Unix implementation. The change consolidates platform-specific code paths, removes the dashmap dependency, and introduces a unified OwnedReceiverLockGuard structure for managing IPC receivers across platforms.

Key Changes:

• Replaced Windows named pipe IPC with shared memory channels
• Unified IPC handling code in a new ipc.rs module shared across platforms
• Added write_encoded method to ShmWriter for direct encoding into shared memory

Reviewed Changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
crates/fspy_shared/src/windows/mod.rs	Updated Payload structure to use ChannelConf instead of pipe handle
crates/fspy_shared/src/ipc/channel/shm_io.rs	Added write_encoded method and renamed test helper function
crates/fspy_shared/src/ipc/channel/mod.rs	Added Windows-specific configuration for raw shared memory
crates/fspy_shared/Cargo.toml	Added thiserror dependency
crates/fspy_preload_windows/src/windows/mod.rs	Removed cleanup call during DLL detach
crates/fspy_preload_windows/src/windows/client.rs	Replaced pipe-based IPC with shared memory sender
crates/fspy_preload_windows/Cargo.toml	Removed dashmap dependency
crates/fspy/src/windows/mod.rs	Replaced pipe creation and reading with shared memory channel
crates/fspy/src/unix/mod.rs	Moved OwnedReceiverLockGuard to shared module
crates/fspy/src/lib.rs	Added new ipc module
crates/fspy/src/ipc.rs	Created shared IPC module with OwnedReceiverLockGuard

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[branchseer]

Merge activity

• Oct 23, 11:58 AM UTC: @branchseer merged this pull request with Graphite.