Expose VMConfig constructor

internal/api/lib.go

@@ -8,6 +8,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"path/filepath"
 	"runtime"
 	"strings"
 	"syscall"
@@ -49,7 +50,7 @@ func InitCache(config types.VMConfig) (Cache, error) {
 		return Cache{}, fmt.Errorf("Could not create base directory")
 	}
 
-	lockfile, err := os.OpenFile(config.Cache.BaseDir+"/exclusive.lock", os.O_WRONLY|os.O_CREATE, 0o666)
+	lockfile, err := os.OpenFile(filepath.Join(config.Cache.BaseDir, "exclusive.lock"), os.O_WRONLY|os.O_CREATE, 0o666)
 	if err != nil {
 		return Cache{}, fmt.Errorf("Could not open exclusive.lock")
 	}

lib_libwasmvm.go

@@ -30,7 +30,6 @@ type VM struct {
 // `cacheSize` sets the size in MiB of an in-memory cache for e.g. module caching. Set to 0 to disable.
 // `deserCost` sets the gas cost of deserializing one byte of data.
 func NewVM(dataDir string, supportedCapabilities []string, memoryLimit uint32, printDebug bool, cacheSize uint32) (*VM, error) {
-	// TODO: expose config variant of NewVM
 	cache, err := api.InitCache(types.VMConfig{
 		Cache: types.CacheOptions{
 			BaseDir:               dataDir,
@@ -45,6 +44,17 @@ func NewVM(dataDir string, supportedCapabilities []string, memoryLimit uint32, p
 	return &VM{cache: cache, printDebug: printDebug}, nil
 }
 
+// NewVMWithConfig creates a new VM with a custom configuration.
+// This allows for more fine-grained control over the VM's behavior compared to NewVM and
+// can be extended more easily in the future.
+func NewVMWithConfig(config types.VMConfig, printDebug bool) (*VM, error) {
+	cache, err := api.InitCache(config)
+	if err != nil {
+		return nil, err
+	}
+	return &VM{cache: cache, printDebug: printDebug}, nil
+}
+
 // Cleanup should be called when no longer using this instances.
 // It frees resources in libwasmvm (the Rust part) and releases a lock in the base directory.
 func (vm *VM) Cleanup() {

types/config.go

@@ -4,6 +4,9 @@ import (
 	"encoding/json"
 )
 
+// VMConfig defines the configuration for the VM.
+// For full documentation see the Rust side:
+// https://github.com/CosmWasm/cosmwasm/blob/main/packages/vm/src/config.rs#L27
 type VMConfig struct {
 	WasmLimits WasmLimits   `json:"wasm_limits"`
 	Cache      CacheOptions `json:"cache"`