/
metadata_engine.go
160 lines (129 loc) · 4.42 KB
/
metadata_engine.go
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package assethook
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"os"
"path/filepath"
"time"
"github.com/kyma-project/kyma/components/asset-store-controller-manager/internal/assethook/api/v1alpha1"
pkgPath "github.com/kyma-project/kyma/components/asset-store-controller-manager/internal/path"
"github.com/kyma-project/kyma/components/asset-store-controller-manager/pkg/apis/assetstore/v1alpha2"
"github.com/pkg/errors"
)
//go:generate mockery -name=MetadataExtractor -output=automock -outpkg=automock -case=underscore
type MetadataExtractor interface {
Extract(ctx context.Context, basePath string, files []string, services []v1alpha2.WebhookService) ([]File, error)
}
type File struct {
Name string
Metadata *json.RawMessage
}
type metadataEngine struct {
timeout time.Duration
fileReader func(filename string) ([]byte, error)
httpClient HttpClient
}
func NewMetadataExtractor(httpClient HttpClient, timeout time.Duration) MetadataExtractor {
return &metadataEngine{
httpClient: httpClient,
timeout: timeout,
fileReader: ioutil.ReadFile,
}
}
func (e *metadataEngine) Extract(ctx context.Context, basePath string, files []string, services []v1alpha2.WebhookService) ([]File, error) {
results := make(map[string]*json.RawMessage)
for _, service := range services {
filtered, err := pkgPath.Filter(files, service.Filter)
if err != nil {
return nil, errors.Wrapf(err, "while filtering files with regex %s", service.Filter)
}
body, contentType, err := e.buildQuery(basePath, filtered)
if err != nil {
return nil, errors.Wrap(err, "while building multipart query")
}
response := &v1alpha1.MetadataResponse{}
err = e.do(ctx, contentType, service, body, response)
if err != nil {
return nil, errors.Wrap(err, "while sending request to metadata webhook")
}
results = e.replaceMetadata(results, response.Data)
}
return e.toFiles(results), nil
}
func (*metadataEngine) replaceMetadata(current map[string]*json.RawMessage, results []v1alpha1.MetadataResultSuccess) map[string]*json.RawMessage {
for _, result := range results {
current[result.FilePath] = result.Metadata
}
return current
}
func (*metadataEngine) toFiles(results map[string]*json.RawMessage) []File {
files := make([]File, 0, len(results))
for k, v := range results {
files = append(files, File{Name: k, Metadata: v})
}
return files
}
func (e *metadataEngine) buildQuery(basePath string, files []string) (io.Reader, string, error) {
b := &bytes.Buffer{}
formWriter := multipart.NewWriter(b)
defer formWriter.Close()
for _, file := range files {
path := filepath.Join(basePath, file)
if err := e.buildQueryField(formWriter, file, path); err != nil {
return nil, "", errors.Wrapf(err, "while building query part")
}
}
return b, formWriter.FormDataContentType(), nil
}
func (e *metadataEngine) buildQueryField(writer *multipart.Writer, filename, path string) error {
file, err := os.Open(path)
if err != nil {
return errors.Wrapf(err, "while opening file %s", filename)
}
defer file.Close()
part, err := writer.CreateFormFile(filename, filepath.Base(file.Name()))
if err != nil {
return errors.Wrapf(err, "while creating part for file %s", filename)
}
_, err = io.Copy(part, file)
if err != nil {
return errors.Wrapf(err, "while copying file %s to part", filename)
}
return nil
}
func (e *metadataEngine) do(ctx context.Context, contentType string, webhook v1alpha2.WebhookService, body io.Reader, response interface{}) error {
ctx, cancel := context.WithTimeout(ctx, e.timeout)
defer cancel()
req, err := http.NewRequest("POST", e.getWebhookUrl(webhook), body)
if err != nil {
return err
}
req.Header.Set("Content-Type", contentType)
req.WithContext(ctx)
rsp, err := e.httpClient.Do(req)
if err != nil {
return errors.Wrapf(err, "while sending request to webhook")
}
defer rsp.Body.Close()
if rsp.StatusCode != http.StatusOK {
return fmt.Errorf("invalid response from %s, code: %d", req.URL, rsp.StatusCode)
}
responseBytes, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return errors.Wrapf(err, "while reading response body")
}
err = json.Unmarshal(responseBytes, response)
if err != nil {
return errors.Wrapf(err, "while parsing response body")
}
return nil
}
func (*metadataEngine) getWebhookUrl(service v1alpha2.WebhookService) string {
return fmt.Sprintf("http://%s.%s.svc.cluster.local%s", service.Name, service.Namespace, service.Endpoint)
}