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range.go
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range.go
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package byterange
import (
"context"
"github.com/Filecoin-Titan/titan-sdk-go/titan"
"github.com/Filecoin-Titan/titan-sdk-go/types"
"github.com/eikenb/pipeat"
"github.com/ipfs/go-cid"
logging "github.com/ipfs/go-log"
"io"
"time"
)
const (
minBackoffDelay = 100 * time.Millisecond
maxBackoffDelay = 3 * time.Second
)
var log = logging.Logger("range")
type Range struct {
titan *titan.Service
size int64
}
func New(service *titan.Service, size int64) *Range {
return &Range{
titan: service,
size: size,
}
}
func (r *Range) GetFile(ctx context.Context, cid cid.Cid) (int64, io.ReadCloser, error) {
directConnEdges, natTraversalEdges, err := r.titan.GroupByEdges(ctx, cid)
if err != nil {
return 0, nil, err
}
workerChan, err := r.makeWorkerChan(ctx, directConnEdges, natTraversalEdges)
if err != nil {
return 0, nil, err
}
fileSize, err := r.getFileSize(ctx, cid, directConnEdges, workerChan)
if err != nil {
return 0, nil, err
}
reader, writer, err := pipeat.Pipe()
if err != nil {
return 0, nil, err
}
(&dispatcher{
cid: cid,
fileSize: fileSize,
rangeSize: r.size,
titan: r.titan,
reader: reader,
writer: writer,
workers: workerChan,
resp: make(chan response, len(workerChan)),
backoff: &backoff{
minDelay: minBackoffDelay,
maxDelay: maxBackoffDelay,
},
}).run(ctx)
return fileSize, reader, nil
}
func (r *Range) getFileSize(ctx context.Context, cid cid.Cid, edges []*types.Edge, workerChan chan worker) (int64, error) {
var (
start int64
size int64 = 1 << 10 // 1 KiB
fileSize int64
)
if len(edges) == 0 {
for {
select {
case w := <-workerChan:
fs, _, err := r.titan.GetRange(ctx, w.c, cid, start, size)
if err != nil {
workerChan <- w
log.Errorf("get range failed: %v", err)
continue
}
workerChan <- w
return fs, nil
case <-ctx.Done():
return 0, nil
}
}
}
for _, edge := range edges {
client := &types.Client{
Node: edge,
HttpClient: r.titan.GetDefaultClient(),
}
fs, _, err := r.titan.GetRange(ctx, client, cid, start, size)
if err != nil {
log.Errorf("get range failed: %v", err)
continue
}
fileSize = fs
break
}
return fileSize, nil
}
func (r *Range) makeWorkerChan(ctx context.Context, n1 []*types.Edge, n2 []*types.Edge) (chan worker, error) {
size := len(n1) + len(n2)
workerChan := make(chan worker, size)
for _, edge := range n1 {
workerChan <- worker{
c: &types.Client{
Node: edge,
HttpClient: r.titan.GetDefaultClient(),
},
}
}
go r.addNewWorker(ctx, workerChan, n2)
return workerChan, nil
}
func (r *Range) addNewWorker(ctx context.Context, newWorkerChan chan worker, edges []*types.Edge) {
_, err := r.titan.Discover()
if err != nil {
log.Warn(err)
return
}
clients, err := r.titan.FilterAccessibleNodes(ctx, edges)
if err != nil {
log.Warn(err)
return
}
for _, client := range clients {
newWorkerChan <- worker{
c: client,
}
}
}