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feat: add handler for wasm transformer
Signed-off-by: Soumil Paranjpay <soumil.paranjpay@gmail.com> Based on work by Vamsi Krishna <vamsikrishnasatyasi971@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,247 @@ | ||
| /* | ||
| * Copyright IBM Corporation 2021 | ||
| * | ||
| * 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 external | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "encoding/json" | ||
| "fmt" | ||
| "path/filepath" | ||
| "sort" | ||
| "strings" | ||
|
|
||
| "github.com/konveyor/move2kube/common" | ||
| "github.com/konveyor/move2kube/environment" | ||
| transformertypes "github.com/konveyor/move2kube/types/transformer" | ||
| "github.com/second-state/WasmEdge-go/wasmedge" | ||
| "github.com/sirupsen/logrus" | ||
| core "k8s.io/kubernetes/pkg/apis/core" | ||
| ) | ||
|
|
||
| const ( | ||
| wasmEnvDelimiter = "=" | ||
| detectInputPathWASMEnvKey = "M2K_DETECT_INPUT_PATH" | ||
| detectOutputPathWASMEnvKey = "M2K_DETECT_OUTPUT_PATH" | ||
| transformInputPathWASMEnvKey = "M2K_TRANSFORM_INPUT_PATH" | ||
| transformOutputPathWASMEnvKey = "M2K_TRANSFORM_OUTPUT_PATH" | ||
| ) | ||
|
|
||
| // WASM implements wasm transformer interface and is used for wasm based transformers | ||
| type WASM struct { | ||
| Config transformertypes.Transformer | ||
| Env *environment.Environment | ||
| WASMConfig *WASMYamlConfig | ||
| } | ||
|
|
||
| // WASMYamlConfig is the format of wasm transformer yaml config | ||
| type WASMYamlConfig struct { | ||
| WASMModule string `yaml:"wasm_module"` | ||
| EnvList []core.EnvVar `yaml:"env,omitempty"` | ||
| } | ||
|
|
||
| // Init Initializes the transformer | ||
| func (t *WASM) Init(tc transformertypes.Transformer, env *environment.Environment) (err error) { | ||
| t.Config = tc | ||
| t.Env = env | ||
| t.WASMConfig = &WASMYamlConfig{} | ||
| if err := common.GetObjFromInterface(t.Config.Spec.Config, t.WASMConfig); err != nil { | ||
| return fmt.Errorf("unable to load config for Transformer %+v into %T . Error: %w", t.Config.Spec.Config, t.WASMConfig, err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (t *WASM) prepareEnv() []string { | ||
| envList := []string{} | ||
| for _, env := range t.WASMConfig.EnvList { | ||
| envList = append(envList, env.Name+wasmEnvDelimiter+env.Value) | ||
| } | ||
| return envList | ||
| } | ||
|
|
||
| // GetConfig returns the transformer config | ||
| func (t *WASM) GetConfig() (transformertypes.Transformer, *environment.Environment) { | ||
| return t.Config, t.Env | ||
| } | ||
|
|
||
| // DirectoryDetect runs detect in each sub directory | ||
| func (t *WASM) DirectoryDetect(dir string) (map[string][]transformertypes.Artifact, error) { | ||
| vm, err := t.initVm([]string{dir + ":" + dir}) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to initialize WASM VM: %w", err) | ||
| } | ||
|
|
||
| allocateResult, err := vm.Execute("malloc", int32(len(dir)+1)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to alloc memory for directory: %w", err) | ||
| } | ||
| dirPointer := allocateResult[0].(int32) | ||
| mod := vm.GetActiveModule() | ||
| mem := mod.FindMemory("memory") | ||
| memData, err := mem.GetData(uint(dirPointer), uint(len(dir)+1)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to load wasm memory region: %w", err) | ||
| } | ||
| copy(memData, dir) | ||
| memData[len(dir)] = 0 | ||
| directoryDetectOutput, dderr := vm.Execute("directoryDetect", dirPointer) | ||
| if dderr != nil { | ||
| err = fmt.Errorf("failed to execute directoryDetect in the wasm module. Error : %w", dderr) | ||
| return nil, err | ||
| } | ||
| directoryDetectOutputPointer := directoryDetectOutput[0].(int32) | ||
| memData, err = mem.GetData(uint(directoryDetectOutputPointer), 8) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to load directoryDetect output: %w", err) | ||
| } | ||
| resultPointer := binary.LittleEndian.Uint32(memData[:4]) | ||
| resultLength := binary.LittleEndian.Uint32(memData[4:]) | ||
| memData, err = mem.GetData(uint(resultPointer), uint(resultLength)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to read directoryDetect output: %w", err) | ||
| } | ||
|
|
||
| services := map[string][]transformertypes.Artifact{} | ||
| err = json.Unmarshal(memData, &services) | ||
| if err != nil { | ||
| err = fmt.Errorf("failed to unmarshal directoryDetect output: %w", err) | ||
| } | ||
| return services, err | ||
| } | ||
|
|
||
| // Transform transforms the artifacts | ||
| func (t *WASM) Transform(newArtifacts []transformertypes.Artifact, alreadySeenArtifacts []transformertypes.Artifact) ([]transformertypes.PathMapping, []transformertypes.Artifact, error) { | ||
| pathMappings := []transformertypes.PathMapping{} | ||
| createdArtifacts := []transformertypes.Artifact{} | ||
| data := make(map[string]interface{}) | ||
| data["newArtifacts"] = newArtifacts | ||
| data["oldArtifacts"] = alreadySeenArtifacts | ||
| dataByt, err := json.Marshal(data) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to marshal transform input: %w", err) | ||
| } | ||
| dataStr := string(dataByt) | ||
|
|
||
| preopens := []string{} | ||
| for _, artifact := range newArtifacts { | ||
| for _, paths := range artifact.Paths { | ||
| for _, path := range paths { | ||
| preopens = append(preopens, path) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| sort.Slice(preopens, func(i, j int) bool { | ||
| l1, l2 := len(preopens[i]), len(preopens[j]) | ||
| if l1 != l2 { | ||
| return l1 < l2 | ||
| } | ||
| return preopens[i] < preopens[j] | ||
| }) | ||
|
|
||
| deduplicatedPreopens := []string{} | ||
| for _, path := range preopens { | ||
| shouldSkip := false | ||
| for _, existingPath := range deduplicatedPreopens { | ||
| if strings.HasPrefix(path, existingPath) { | ||
| shouldSkip = true | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if !shouldSkip { | ||
| deduplicatedPreopens = append(deduplicatedPreopens, path) | ||
| } | ||
| } | ||
|
|
||
| finalPreopens := []string{} | ||
| for _, path := range deduplicatedPreopens { | ||
| finalPreopens = append(finalPreopens, path+":"+path) | ||
| } | ||
|
|
||
| vm, err := t.initVm(finalPreopens) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to initialize VM (transform): %w", err) | ||
| } | ||
|
|
||
| allocateResult, err := vm.Execute("malloc", int32(len(dataStr)+1)) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to alloc memory for transform input: %w", err) | ||
| } | ||
| dataPointer := allocateResult[0].(int32) | ||
| mod := vm.GetActiveModule() | ||
| mem := mod.FindMemory("memory") | ||
| memData, err := mem.GetData(uint(dataPointer), uint(len(dataStr)+1)) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to load wasm memory region: %w", err) | ||
| } | ||
| copy(memData, dataStr) | ||
| memData[len(dataStr)] = 0 | ||
| transformOutput, err := vm.Execute("transform", dataPointer) | ||
| transformOutputPointer := transformOutput[0].(int32) | ||
| memData, err = mem.GetData(uint(transformOutputPointer), 8) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to load transform output: %w", err) | ||
| } | ||
| resultPointer := binary.LittleEndian.Uint32(memData[:4]) | ||
| resultLength := binary.LittleEndian.Uint32(memData[4:]) | ||
| memData, err = mem.GetData(uint(resultPointer), uint(resultLength)) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to read transform output: %w", err) | ||
| } | ||
| logrus.Debug(string(memData)) | ||
| var output transformertypes.TransformOutput | ||
| err = json.Unmarshal(memData, &output) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("failed to unmarshal transformer output: %w", err) | ||
| } | ||
| pathMappings = append(pathMappings, output.PathMappings...) | ||
| createdArtifacts = append(createdArtifacts, output.CreatedArtifacts...) | ||
| return pathMappings, createdArtifacts, err | ||
| } | ||
|
|
||
| func (t *WASM) initVm(preopens []string) (*wasmedge.VM, error) { | ||
| wasmedge.SetLogErrorLevel() | ||
| conf := wasmedge.NewConfigure(wasmedge.WASI) | ||
| vm := wasmedge.NewVMWithConfig(conf) | ||
|
|
||
| wasi := vm.GetImportModule(wasmedge.WASI) | ||
| wasi.InitWasi( | ||
| []string{}, | ||
| t.prepareEnv(), | ||
| preopens, | ||
| ) | ||
|
|
||
| err := vm.LoadWasmFile(filepath.Join(t.Env.GetEnvironmentContext(), t.WASMConfig.WASMModule)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to load wasm module %s: %w", t.WASMConfig.WASMModule, err) | ||
| } | ||
| err = vm.Validate() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to validate VM: %w", err) | ||
| } | ||
| err = vm.Instantiate() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to instantiate VM: %w", err) | ||
| } | ||
| _, err = vm.Execute("_start") | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to execute _start: %w", err) | ||
| } | ||
|
|
||
| return vm, nil | ||
| } |
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