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wasm.go
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wasm.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 (
"context"
"fmt"
"io"
"os"
"path/filepath"
"github.com/GoogleContainerTools/kpt/pkg/wasm"
)
type WasmRuntime string
const (
Wasmtime WasmRuntime = "wasmtime"
Nodejs WasmRuntime = "nodejs"
WasmRuntimeEnv = "KPT_FN_WASM_RUNTIME"
jsEntrypointFunction = "processResourceList"
)
type WasmFn struct {
runtimeType WasmRuntime
wasmtime *WasmtimeFn
nodejs *WasmNodejsFn
}
func NewWasmFn(loader WasmLoader) (*WasmFn, error) {
switch os.Getenv(WasmRuntimeEnv) {
case string(Nodejs):
nf, err := NewNodejsFn(loader)
if err != nil {
return nil, err
}
return &WasmFn{
runtimeType: Nodejs,
nodejs: nf,
}, nil
case "":
fallthrough
case string(Wasmtime):
wf, err := NewWasmtimeFn(loader)
if err != nil {
return nil, err
}
return &WasmFn{
runtimeType: Wasmtime,
wasmtime: wf,
}, nil
default:
return nil, fmt.Errorf("unsupported wasm runtime: %v", os.Getenv(WasmRuntimeEnv))
}
}
func (f *WasmFn) Run(r io.Reader, w io.Writer) error {
switch f.runtimeType {
case Nodejs:
return f.nodejs.Run(r, w)
case Wasmtime:
return f.wasmtime.Run(r, w)
default:
return fmt.Errorf("unknown wasm runtime type: %q", f.runtimeType)
}
}
type WasmLoader interface {
// getReadCloser returns an io.ReadCloser to read the wasm contents.
getReadCloser() (io.ReadCloser, error)
// getFilePath returns a path to the wasm file.
getFilePath() (string, error)
// cleanup remove temporary directory or files.
cleanup() error
}
type OciLoader struct {
cacheDir string
image string
tempDir string
}
var _ WasmLoader = &OciLoader{}
func NewOciLoader(cacheDir, image string) *OciLoader {
return &OciLoader{
cacheDir: cacheDir,
image: image,
}
}
func (o *OciLoader) getReadCloser() (io.ReadCloser, error) {
storage, err := wasm.NewClient(o.cacheDir)
if err != nil {
return nil, fmt.Errorf("unable to create a storage client: %w", err)
}
rc, err := storage.LoadWasm(context.TODO(), o.image)
if err != nil {
return nil, fmt.Errorf("unable to load image from %v: %w", o.image, err)
}
return rc, nil
}
func (o *OciLoader) getFilePath() (string, error) {
rc, err := o.getReadCloser()
if err != nil {
return "", fmt.Errorf("unable to get reader from OCI image: %w", err)
}
defer rc.Close()
data, err := io.ReadAll(rc)
if err != nil {
return "", fmt.Errorf("unable to read wasm content from reader: %w", err)
}
o.tempDir, err = os.MkdirTemp(o.cacheDir, "oci-loader-")
if err != nil {
return "", fmt.Errorf("unable to create temp dir in %v: %w", o.cacheDir, err)
}
wasmFile := filepath.Join(o.tempDir, "fn.wasm")
err = os.WriteFile(wasmFile, data, 0644)
if err != nil {
return "", fmt.Errorf("unable to write wasm content to %v: %w", wasmFile, err)
}
return wasmFile, nil
}
func (o *OciLoader) cleanup() error {
if o.tempDir != "" {
return os.RemoveAll(o.tempDir)
}
return nil
}
type FsLoader struct {
Filename string
}
var _ WasmLoader = &FsLoader{}
func (f *FsLoader) getFilePath() (string, error) {
return f.Filename, nil
}
func (f *FsLoader) getReadCloser() (io.ReadCloser, error) {
fi, err := os.Open(f.Filename)
if err != nil {
return nil, fmt.Errorf("failed to open file %v: %w", f.Filename, err)
}
return fi, nil
}
func (f *FsLoader) cleanup() error {
return nil
}