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util.go
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/
util.go
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package importer
import (
"encoding/base64"
"fmt"
"io"
"net/url"
"os"
"github.com/golang/glog"
"github.com/pkg/errors"
"kubevirt.io/containerized-data-importer/pkg/common"
)
// ParseEnvVar provides a wrapper to attempt to fetch the specified env var
func ParseEnvVar(envVarName string, decode bool) (string, error) {
value := os.Getenv(envVarName)
if decode {
v, err := base64.StdEncoding.DecodeString(value)
if err != nil {
return "", errors.Errorf("error decoding environment variable %q", envVarName)
}
value = fmt.Sprintf("%s", v)
}
return value, nil
}
// ParseEndpoint parses the required endpoint and return the url struct.
func ParseEndpoint(endpt string) (*url.URL, error) {
var err error
if endpt == "" {
endpt, err = ParseEnvVar(common.ImporterEndpoint, false)
if err != nil {
return nil, err
}
if endpt == "" {
return nil, errors.Errorf("endpoint %q is missing or blank", common.ImporterEndpoint)
}
}
return url.Parse(endpt)
}
// StreamDataToFile provides a function to stream the specified io.Reader to the specified local file
func StreamDataToFile(dataReader io.Reader, filePath string) error {
// Attempt to create the file with name filePath. If it exists, fail.
outFile, err := os.OpenFile(filePath, os.O_CREATE|os.O_EXCL|os.O_WRONLY, os.ModePerm)
defer outFile.Close()
if err != nil {
return errors.Wrapf(err, "could not open file %q", filePath)
}
glog.V(1).Infof("begin import...\n")
if _, err = io.Copy(outFile, dataReader); err != nil {
os.Remove(outFile.Name())
return errors.Wrapf(err, "unable to write to file")
}
return nil
}