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67 lines
1.8 KiB
67 lines
1.8 KiB
package downloader
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import (
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"context"
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"fmt"
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"log"
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"time"
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pb "github.com/harmony-one/harmony/api/services/syncing/downloader/proto"
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"google.golang.org/grpc"
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)
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// Client is the client model for downloader package.
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type Client struct {
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dlClient pb.DownloaderClient
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opts []grpc.DialOption
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conn *grpc.ClientConn
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}
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// ClientSetup setups a Client given ip and port.
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func ClientSetup(ip, port string) *Client {
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client := Client{}
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client.opts = append(client.opts, grpc.WithInsecure())
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var err error
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client.conn, err = grpc.Dial(fmt.Sprintf("%s:%s", ip, port), client.opts...)
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if err != nil {
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log.Fatalf("fail to dial: %v", err)
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return nil
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}
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client.dlClient = pb.NewDownloaderClient(client.conn)
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return &client
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}
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// Close closes the Client.
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func (client *Client) Close() {
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client.conn.Close()
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}
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// GetBlockHashes gets block hashes from all the peers by calling grpc request.
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func (client *Client) GetBlockHashes() *pb.DownloaderResponse {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_HEADER}
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response, err := client.dlClient.Query(ctx, request)
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if err != nil {
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log.Fatalf("Error")
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}
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return response
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}
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// GetBlocks gets blocks in serialization byte array by calling a grpc request.
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func (client *Client) GetBlocks(hashes [][]byte) *pb.DownloaderResponse {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_BLOCK}
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request.Hashes = make([][]byte, len(hashes))
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for i := range hashes {
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request.Hashes[i] = make([]byte, len(hashes[i]))
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copy(request.Hashes[i], hashes[i])
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}
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response, err := client.dlClient.Query(ctx, request)
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if err != nil {
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log.Fatalf("Error")
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}
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return response
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}
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