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dll plugin loading heavily improved

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KingKDot
2026-06-28 23:46:56 -05:00
parent d3ded9f877
commit 2c42a989cf
13 changed files with 471 additions and 63 deletions
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plugins/docs/legacy-native-plugins.md
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@@ -172,12 +172,49 @@ Go shared libraries cannot be fully unloaded safely because the Go runtime owns
| Platform | Loading behavior |
|----------|------------------|
| Windows | DLLs are loaded from memory through the custom PE loader. |
| Windows | DLLs default to the custom in-memory PE loader. Plugins can set `nativeLoader: "os"` to stage the DLL in the agent cache and load it with `LoadLibraryExW`. |
| Linux | Shared libraries are loaded through the static-agent subprocess shim when needed. |
| macOS | Dynamic libraries are loaded through the platform loader. |
Because Windows uses an in-memory PE loader, some runtime primitives that assume normal `LoadLibrary` initialization can be fragile. The Rust sample avoids `std::sync::Mutex` for this reason and uses C-style globals; the host serializes plugin calls.
### Windows Loader Selection
Set `nativeLoader` in `config.json`:
```json
{
"runtime": "native",
"nativeLoader": "memory"
}
```
| Value | Behavior |
|-------|----------|
| `memory` | Default. Loads the PE image from bytes without staging the plugin DLL on disk. |
| `os` | Writes a content-addressed copy to the agent cache and loads it with `LoadLibraryExW`. Prefer this for Go DLLs or other runtimes that rely on the normal Windows loader. |
The OS loader path reuses the cached DLL when the SHA-256 hash matches, so repeated loads do not rewrite the same plugin. Windows keeps loaded images locked; old cached plugin versions are left for later cleanup.
### Custom Export Names
Native plugins may override the exported ABI names in `config.json`:
```json
{
"runtime": "native",
"nativeEntrypoints": {
"onLoad": "StartPlugin",
"onEvent": "HandlePluginEvent",
"onUnload": "StopPlugin",
"setCallback": "SetHostCallback",
"getRuntime": "RuntimeName"
}
}
```
Omitted fields use the standard names. The signatures must stay ABI-compatible with `PluginOnLoad`, `PluginOnEvent`, `PluginOnUnload`, `PluginSetCallback`, and `PluginGetRuntime`; only the exported symbol names change. Custom names are honored by the Windows loader and direct `dlopen`/`dlsym` paths. The Linux static-agent subprocess shim still expects the standard names.
## Static Linux Agent Shim
Linux agents are compiled as static musl binaries for portability. Static binaries cannot directly call `dlopen`, so Linux native plugin support uses an embedded plugin-host shim.