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nodejs.go
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nodejs.go
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// Copyright 2022 The kpt Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fnruntime
import (
"fmt"
"io"
"os"
"path/filepath"
fnresult "github.com/GoogleContainerTools/kpt/pkg/api/fnresult/v1"
)
const (
WasmPathEnv = "KPT_FN_WASM_PATH"
)
type WasmNodejsFn struct {
NodeJsRunner *ExecFn
loader WasmLoader
}
func NewNodejsFn(loader WasmLoader) (*WasmNodejsFn, error) {
cacheDir := filepath.Join(os.TempDir(), "kpt-wasm-fn")
err := os.MkdirAll(cacheDir, 0755)
if err != nil {
return nil, fmt.Errorf("unable to create cache dir: %w", err)
}
tempDir, err := os.MkdirTemp(cacheDir, "nodejs-")
if err != nil {
return nil, fmt.Errorf("unable to create temp dir: %w", err)
}
jsPath := filepath.Join(tempDir, "kpt-fn-wasm-glue-runner.js")
if err = os.WriteFile(jsPath, []byte(golangWasmJSCode+glueCode), 0644); err != nil {
return nil, fmt.Errorf("unable to write the js glue code file: %w", err)
}
wasmFile, err := loader.getFilePath()
if err != nil {
return nil, err
}
f := &WasmNodejsFn{
NodeJsRunner: &ExecFn{
Path: "node",
Args: []string{jsPath},
Env: map[string]string{
WasmPathEnv: wasmFile,
},
FnResult: &fnresult.Result{},
},
loader: loader,
}
return f, nil
}
func (f *WasmNodejsFn) Run(r io.Reader, w io.Writer) error {
if err := f.NodeJsRunner.Run(r, w); err != nil {
return fmt.Errorf("failed to run wasm with node.js: %w", err)
}
return f.loader.cleanup()
}