seaweedfs/weed/filer/read_write.go

package filer

import (
	"bytes"
	"fmt"
	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
	"github.com/chrislusf/seaweedfs/weed/util"
	"github.com/chrislusf/seaweedfs/weed/wdclient"
	"io/ioutil"
	"math"
	"net/http"
	"time"
)

func ReadEntry(masterClient *wdclient.MasterClient, filerClient filer_pb.SeaweedFilerClient, dir, name string, byteBuffer *bytes.Buffer) error {

	request := &filer_pb.LookupDirectoryEntryRequest{
		Directory: dir,
		Name:      name,
	}
	respLookupEntry, err := filer_pb.LookupEntry(filerClient, request)
	if err != nil {
		return err
	}
	if len(respLookupEntry.Entry.Content) > 0 {
		_, err = byteBuffer.Write(respLookupEntry.Entry.Content)
		return err
	}

	return StreamContent(masterClient, byteBuffer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64)

}

func ReadContent(filerAddress string, dir, name string) ([]byte, error) {

	target := fmt.Sprintf("http://%s%s/%s", filerAddress, dir, name)

	data, _, err := util.Get(target)

	return data, err
}

func SaveAs(host string, port int, dir, name string, contentType string, byteBuffer *bytes.Buffer) error {
	var target string
	if port == 0 {
		target = fmt.Sprintf("http://%s%s/%s", host, dir, name)
	} else {
		target = fmt.Sprintf("http://%s:%d%s/%s", host, port, dir, name)
	}

	// set the HTTP method, url, and request body
	req, err := http.NewRequest(http.MethodPut, target, byteBuffer)
	if err != nil {
		return err
	}

	// set the request header Content-Type for json
	if contentType != "" {
		req.Header.Set("Content-Type", contentType)
	}
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return err
	}
	defer util.CloseResponse(resp)

	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return err
	}

	if resp.StatusCode >= 400 {
		return fmt.Errorf("%s: %s %v", target, resp.Status, string(b))
	}

	return nil

}

func SaveInsideFiler(client filer_pb.SeaweedFilerClient, dir, name string, content []byte) error {

	resp, err := filer_pb.LookupEntry(client, &filer_pb.LookupDirectoryEntryRequest{
		Directory: dir,
		Name:      name,
	})

	if err == filer_pb.ErrNotFound {
		err = filer_pb.CreateEntry(client, &filer_pb.CreateEntryRequest{
			Directory: dir,
			Entry: &filer_pb.Entry{
				Name:        name,
				IsDirectory: false,
				Attributes: &filer_pb.FuseAttributes{
					Mtime:       time.Now().Unix(),
					Crtime:      time.Now().Unix(),
					FileMode:    uint32(0644),
					Collection:  "",
					Replication: "",
					FileSize:    uint64(len(content)),
				},
				Content: content,
			},
		})
	} else if err == nil {
		entry := resp.Entry
		entry.Content = content
		entry.Attributes.Mtime = time.Now().Unix()
		entry.Attributes.FileSize = uint64(len(content))
		err = filer_pb.UpdateEntry(client, &filer_pb.UpdateEntryRequest{
			Directory: dir,
			Entry:     entry,
		})
	}

	return err
}