envoyproxy/envoy

Lua: global table to store state between threads

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#4,027 opened on Aug 1, 2018

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 (8 comments) (3 reactions) (0 assignees)C++ (5,373 forks)batch import
enhancementhelp wanted

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Description

Description: Lua state is per worker and it will be non-trivial/impossible to share it between threads. A global storage for Lua is to provide a Lua API that wraps a metadata/table that calls into C++ code with proper locking to set/get items in a global table. All Lua code can access global table and share state in different Envoy Lua filters.

The original request is from #4008

Contributor guide

Research direction
Implement a global Lua table with proper locking to share state between threads in Envoy Lua filters.
Tech stack
cpplua
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C++LuaConcurrencyEnvoy
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60