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cache_example_test.go
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/
cache_example_test.go
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package wazero_test
import (
"context"
_ "embed"
"log"
"os"
"github.com/AR1011/wazero"
)
// This is a basic example of using the file system compilation cache via wazero.NewCompilationCacheWithDir.
// The main goal is to show how it is configured.
func Example_compileCache() {
// Prepare a cache directory.
cacheDir, err := os.MkdirTemp("", "example")
if err != nil {
log.Panicln(err)
}
defer os.RemoveAll(cacheDir)
ctx := context.Background()
// Create a runtime config which shares a compilation cache directory.
cache := newCompilationCacheWithDir(cacheDir)
defer cache.Close(ctx)
config := wazero.NewRuntimeConfig().WithCompilationCache(cache)
// Using the same wazero.CompilationCache instance allows the in-memory cache sharing.
newRuntimeCompileClose(ctx, config)
newRuntimeCompileClose(ctx, config)
// Since the above stored compiled functions to disk as well, below won't compile from scratch.
// Instead, compilation result stored in the directory is re-used.
newRuntimeCompileClose(ctx, config.WithCompilationCache(newCompilationCacheWithDir(cacheDir)))
newRuntimeCompileClose(ctx, config.WithCompilationCache(newCompilationCacheWithDir(cacheDir)))
// Output:
//
}
func newCompilationCacheWithDir(cacheDir string) wazero.CompilationCache {
cache, err := wazero.NewCompilationCacheWithDir(cacheDir)
if err != nil {
log.Panicln(err)
}
return cache
}
// newRuntimeCompileDestroy creates a new wazero.Runtime, compile a binary, and then delete the runtime.
func newRuntimeCompileClose(ctx context.Context, config wazero.RuntimeConfig) {
r := wazero.NewRuntimeWithConfig(ctx, config)
defer r.Close(ctx) // This closes everything this Runtime created except the file system cache.
_, err := r.CompileModule(ctx, addWasm)
if err != nil {
log.Panicln(err)
}
}