multi-get

[bisho]

Motivation / Description

This pull request adds batch operation support to the memcache socket implementation by introducing a meta_multiget method that can efficiently retrieve multiple keys in a single operation.

Changes introduced

• Added meta_multiget method to MemcacheSocket class that accepts a list of keys and optional request flags
• The method builds all commands into a single buffer, sends them in one syscall, and receives all responses in a tight Rust loop with GIL released during socket I/O
• Returns responses in the same order as the input keys, maintaining consistency with individual get operations
• Removed unused get_value method from the Rust implementation
• Added comprehensive test coverage for the new batch functionality including edge cases like empty keys, mixed hits/misses, large values, small buffers, and various flag combinations
• Updated type stubs to include the new meta_multiget method signature and documentation

[bisho]

• Raw cmd for special usages #17
• multi-get #16 👈 (View in Graphite)
• Move key encoding to socket api #15
• Add meta command methods to MemcacheSocket #14
• Add MemcacheSocket class and response types with CI tests #13
• Bump version to 0.1.7 and add Python 3.13t support #12
• Refactor parse_header to return structured type and update to Rust 2024 #11
• Bump version to 0.1.6 and optimize performance #9
• Update to PyO3 Bound API #10
• main

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[ethervoid]

@claude review this pr

[Copilot]

Pull request overview

This PR adds batch meta-get support to the MemcacheSocket implementation via a new meta_multiget method, enabling multiple mg commands to be issued and parsed within a single Rust call (with GIL released during socket I/O).

Changes:

• Added MemcacheSocket.meta_multiget in Rust to pipeline multiple mg requests and collect responses in input order.
• Added a new Python test suite for meta_multiget, including ordering, buffering, mixed hit/miss, and NOOP-drain scenarios.
• Updated the .pyi type stubs and documentation to expose meta_multiget.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
src/memcache_socket.rs	Implements meta_multiget with batched send + tight response loop under py.detach.
tests/test_memcache_socket.py	Adds batch-oriented tests for meta_multiget covering edge cases and socket state interactions.
meta_memcache_socket.pyi	Adds the meta_multiget stub and docstring.

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