chore: remove env shims (#36)

Now that we have support for the new namespace in every pdk and sdk, we
can safely remove the polyfills for `env`

extism.go

@@ -251,7 +251,7 @@ func NewPlugin(
 		hostModules[f.Namespace] = append(hostModules[f.Namespace], f)
 	}
 
-	env, err := buildEnvModule(ctx, rt, extism, hostModules["env"])
+	env, err := buildEnvModule(ctx, rt, extism)
 	if err != nil {
 		return nil, err
 	}
@@ -270,11 +270,6 @@ func NewPlugin(
 	}
 
 	for name, funcs := range hostModules {
-		// `env` host functions are handled by `buildEnvModule
-		if name == "env" {
-			continue
-		}
-
 		_, err := buildHostModule(c.ctx, c.Wazero, name, funcs)
 		if err != nil {
 			return nil, err

host.go

@@ -221,9 +221,8 @@ func defineCustomHostFunctions(builder wazero.HostModuleBuilder, funcs []HostFun
 	}
 }
 
-func buildEnvModule(ctx context.Context, rt wazero.Runtime, extism api.Module, funcs []HostFunction) (api.Module, error) {
+func buildEnvModule(ctx context.Context, rt wazero.Runtime, extism api.Module) (api.Module, error) {
 	builder := rt.NewHostModuleBuilder("extism:host/env")
-	envBuilder := rt.NewHostModuleBuilder("env")
 
 	wrap := func(name string, params []ValType, results []ValType) {
 		f := extism.ExportedFunction(name)
@@ -236,17 +235,6 @@ func buildEnvModule(ctx context.Context, rt wazero.Runtime, extism api.Module, f
 				}
 			}), params, results).
 			Export(name)
-
-		// Register the functions in the `env` namespace too for backward compatibility
-		envBuilder.
-			NewFunctionBuilder().
-			WithGoModuleFunction(api.GoModuleFunc(func(ctx context.Context, m api.Module, stack []uint64) {
-				err := f.CallWithStack(ctx, stack)
-				if err != nil {
-					panic(err)
-				}
-			}), params, results).
-			Export(fmt.Sprintf("extism_%s", name))
 	}
 
 	wrap("alloc", []ValType{I64}, []ValType{I64})
@@ -270,29 +258,16 @@ func buildEnvModule(ctx context.Context, rt wazero.Runtime, extism api.Module, f
 		WithGoModuleFunction(api.GoModuleFunc(api.GoModuleFunc(inputLoad_u64)), []ValType{I64}, []ValType{I64}).
 		Export("input_load_u64")
 
-	envBuilder.NewFunctionBuilder().
-		WithGoModuleFunction(api.GoModuleFunc(inputLoad_u64), []ValType{I64}, []ValType{I64}).
-		Export("extism_input_load_u64")
-
 	builder.NewFunctionBuilder().
 		WithGoModuleFunction(api.GoModuleFunc(load_u64), []ValType{I64}, []ValType{I64}).
 		Export("load_u64")
 
-	envBuilder.NewFunctionBuilder().
-		WithGoModuleFunction(api.GoModuleFunc(load_u64), []ValType{I64}, []ValType{I64}).
-		Export("extism_load_u64")
-
 	builder.NewFunctionBuilder().
 		WithGoModuleFunction(api.GoModuleFunc(store_u64), []ValType{I64, I64}, []ValType{}).
 		Export("store_u64")
 
-	envBuilder.NewFunctionBuilder().
-		WithGoModuleFunction(api.GoModuleFunc(store_u64), []ValType{I64, I64}, []ValType{}).
-		Export("extism_store_u64")
-
 	hostFunc := func(name string, f interface{}) {
 		builder.NewFunctionBuilder().WithFunc(f).Export(name)
-		envBuilder.NewFunctionBuilder().WithFunc(f).Export(fmt.Sprintf("extism_%s", name))
 	}
 
 	hostFunc("config_get", configGet)
@@ -301,8 +276,6 @@ func buildEnvModule(ctx context.Context, rt wazero.Runtime, extism api.Module, f
 	hostFunc("http_request", httpRequest)
 	hostFunc("http_status_code", httpStatusCode)
 
-	defineCustomHostFunctions(envBuilder, funcs)
-
 	logFunc := func(name string, level LogLevel) {
 		hostFunc(name, func(ctx context.Context, m api.Module, offset uint64) {
 			if plugin, ok := ctx.Value("plugin").(*Plugin); ok {
@@ -325,11 +298,6 @@ func buildEnvModule(ctx context.Context, rt wazero.Runtime, extism api.Module, f
 	logFunc("log_warn", Warn)
 	logFunc("log_error", Error)
 
-	_, err := envBuilder.Instantiate(ctx)
-	if err != nil {
-		return nil, err
-	}
-
 	return builder.Instantiate(ctx)
 }