proxy_wasm_lua_resolver
The `proxy_wasm_lua_resolver` directive allows specifying a Lua resolver for WebAssembly modules in NGINX, enabling dynamic resolution of Wasm modules.
Description
The proxy_wasm_lua_resolver directive integrates Lua scripting capabilities with the Proxy-Wasm functionality in NGINX powered by the Wasmtime runtime. It enables the dynamic resolution of WebAssembly (Wasm) modules based on Lua code, allowing for more flexible and programmable configurations. By using Lua to determine which Wasm module to load, administrators can implement complex logic that goes beyond static configuration.
This directive is particularly useful when the choice of the Wasm module depends on runtime data, such as the request URL or headers. The Lua resolver is expected to return the name or path of the Wasm module to be executed when a specific request is made, enabling a seamless interaction within the NGINX processing flow. The introduction of this directive adds a layer of programmability that can leverage Lua’s powerful scripting capabilities within the NGINX web server context.
Parameters for the proxy_wasm_lua_resolver directive include the name of the resolver, which typically identifies the Lua script responsible for resolving Wasm module paths. It is used in contexts where decisions about Wasm execution need to be made based on dynamic conditions, making it invaluable for developers aiming to create modular and adaptable web services using NGINX.
Config Example
http {
# Define a Lua resolver for resolving Wasm modules
proxy_wasm_lua_resolver my_lua_resolver;
server {
listen 8080;
location /myapi {
# Use the specified Lua resolver to determine the Wasm module
proxy_wasm my_filter;
proxy_pass http://backend;
}
}
}Ensure the Lua resolver script is correctly defined and accessible in the NGINX context.
Check that the returned path from the Lua resolver points to a valid Wasm module.
Debugging Lua scripts may require additional tooling or logging within the NGINX configuration.