github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/cli/cmd/plugin/download/fetch.go (about)

     1  // Copyright 2019 The Kubernetes Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package download
    16  
    17  import (
    18  	"io"
    19  	"net/http"
    20  	"os"
    21  
    22  	"github.com/pkg/errors"
    23  	"k8s.io/klog/v2"
    24  )
    25  
    26  type Fetcher interface {
    27  	// Get gets the file and returns an stream to read the file.
    28  	Get(uri string) (io.ReadCloser, error)
    29  }
    30  
    31  var _ Fetcher = HTTPFetcher{}
    32  
    33  // HTTPFetcher is used to get a file from a http:// or https:// schema path.
    34  type HTTPFetcher struct{}
    35  
    36  // Get gets the file and returns a stream to read the file.
    37  func (HTTPFetcher) Get(uri string) (io.ReadCloser, error) {
    38  	klog.V(2).Infof("Fetching %q", uri)
    39  	resp, err := http.Get(uri)
    40  	if err != nil {
    41  		return nil, errors.Wrapf(err, "failed to download %q", uri)
    42  	}
    43  	return resp.Body, nil
    44  }
    45  
    46  var _ Fetcher = fileFetcher{}
    47  
    48  type fileFetcher struct{ f string }
    49  
    50  func (f fileFetcher) Get(_ string) (io.ReadCloser, error) {
    51  	klog.V(2).Infof("Reading %q", f.f)
    52  	file, err := os.Open(f.f)
    53  	return file, errors.Wrapf(err, "failed to open archive file %q for reading", f.f)
    54  }
    55  
    56  // NewFileFetcher returns a local file reader.
    57  func NewFileFetcher(path string) Fetcher { return fileFetcher{f: path} }