github.com/murrekatt/go-ethereum@v1.5.8-0.20170123175102-fc52f2c007fb/swarm/api/storage.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package api
    18  
    19  type Response struct {
    20  	MimeType string
    21  	Status   int
    22  	Size     int64
    23  	// Content  []byte
    24  	Content string
    25  }
    26  
    27  // implements a service
    28  type Storage struct {
    29  	api *Api
    30  }
    31  
    32  func NewStorage(api *Api) *Storage {
    33  	return &Storage{api}
    34  }
    35  
    36  // Put uploads the content to the swarm with a simple manifest speficying
    37  // its content type
    38  func (self *Storage) Put(content, contentType string) (string, error) {
    39  	return self.api.Put(content, contentType)
    40  }
    41  
    42  // Get retrieves the content from bzzpath and reads the response in full
    43  // It returns the Response object, which serialises containing the
    44  // response body as the value of the Content field
    45  // NOTE: if error is non-nil, sResponse may still have partial content
    46  // the actual size of which is given in len(resp.Content), while the expected
    47  // size is resp.Size
    48  func (self *Storage) Get(bzzpath string) (*Response, error) {
    49  	reader, mimeType, status, err := self.api.Get(bzzpath, true)
    50  	if err != nil {
    51  		return nil, err
    52  	}
    53  	quitC := make(chan bool)
    54  	expsize, err := reader.Size(quitC)
    55  	if err != nil {
    56  		return nil, err
    57  	}
    58  	body := make([]byte, expsize)
    59  	size, err := reader.Read(body)
    60  	if int64(size) == expsize {
    61  		err = nil
    62  	}
    63  	return &Response{mimeType, status, expsize, string(body[:size])}, err
    64  }
    65  
    66  // Modify(rootHash, path, contentHash, contentType) takes th e manifest trie rooted in rootHash,
    67  // and merge on  to it. creating an entry w conentType (mime)
    68  func (self *Storage) Modify(rootHash, path, contentHash, contentType string) (newRootHash string, err error) {
    69  	return self.api.Modify(rootHash+"/"+path, contentHash, contentType, true)
    70  }