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add test for request metadata stage
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Original file line number | Diff line number | Diff line change |
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package internal | ||
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import ( | ||
"bytes" | ||
"errors" | ||
"fmt" | ||
"net" | ||
"time" | ||
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logger "github.com/codecrafters-io/tester-utils/logger" | ||
"github.com/codecrafters-io/tester-utils/test_case_harness" | ||
"github.com/jackpal/bencode-go" | ||
) | ||
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var metadataRequestChannel = make(chan bool) | ||
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func testMagnetRequestMetadata(stageHarness *test_case_harness.TestCaseHarness) error { | ||
initRandom() | ||
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logger := stageHarness.Logger | ||
executable := stageHarness.Executable | ||
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magnetLink := randomMagnetLink() | ||
params, err := NewMagnetTestParams(magnetLink, logger) | ||
if err != nil { | ||
return err | ||
} | ||
go listenAndServeTrackerResponse(params.toTrackerParams()) | ||
go waitAndHandlePeerConnection(params.toPeerConnectionParams(), handleMetadataRequest) | ||
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logger.Infof("Running ./your_bittorrent.sh magnet_info %q", params.MagnetUrlEncoded) | ||
result, err := executable.Run("magnet_info", params.MagnetUrlEncoded) | ||
if err != nil { | ||
return err | ||
} | ||
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if err = assertExitCode(result, 0); err != nil { | ||
return err | ||
} | ||
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success := <-metadataRequestChannel | ||
if success { | ||
return nil | ||
} | ||
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return errors.New("metadata request not received") | ||
} | ||
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func handleMetadataRequest(conn net.Conn, params PeerConnectionParams) { | ||
defer conn.Close() | ||
logger := params.logger | ||
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if err := receiveAndSendHandshake(conn, params); err != nil { | ||
return | ||
} | ||
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if err := sendBitfieldMessage(conn, params.bitfield, logger); err != nil { | ||
return | ||
} | ||
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if err := sendExtensionHandshake(conn, params.myMetadataExtensionID, params.metadataSizeBytes, logger); err != nil { | ||
return | ||
} | ||
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theirMetadataExtensionID, err := receiveAndAssertExtensionHandshake(conn, logger) | ||
if err != nil { | ||
return | ||
} | ||
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if err := readMetadataRequest(conn, logger); err != nil { | ||
return | ||
} | ||
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// Send in case other party is waiting for this to terminate | ||
sendMetadataResponse(conn, theirMetadataExtensionID, params.magnetLink, logger) | ||
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metadataRequestChannel <- true | ||
} | ||
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func readMetadataRequest(conn net.Conn, logger *logger.Logger) (err error) { | ||
defer logOnExit(logger, &err) | ||
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logger.Debugln("Waiting to receive metadata request") | ||
msg, err := readMessage(conn) | ||
if err != nil { | ||
return fmt.Errorf("error reading message: %v", err.Error()) | ||
} | ||
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if msg.ID != MsgExtended { | ||
return fmt.Errorf("incorrect message ID, expected=%d, actual=%d", MsgExtended, msg.ID) | ||
} | ||
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logger.Debugf("Received payload: %s", string(msg.Payload)) | ||
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// First byte of the payload is extension message id | ||
// Rest of payload will be a bencoded dictionary like: d8:msg_typei0e5:piecei0ee | ||
decoded, err := bencode.Decode(bytes.NewReader(msg.Payload[1:])) | ||
if err != nil { | ||
return fmt.Errorf("error decoding metadata request message payload: %v", err) | ||
} | ||
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dict, ok := decoded.(map[string]interface{}) | ||
if !ok { | ||
return errors.New("expected dictionary with string keys not found in payload") | ||
} | ||
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messageType, exists := dict["msg_type"] | ||
if !exists { | ||
return errors.New("expected msg_type key not found in dictionary") | ||
} | ||
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messageTypeInt, ok := messageType.(int64) | ||
if !ok { | ||
return errors.New("expected msg_type to be an integer") | ||
} | ||
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if messageTypeInt != 0 { | ||
return fmt.Errorf("expected msg_type key with value=0, actual value=%v", messageType) | ||
} | ||
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pieceIndex, exists := dict["piece"] | ||
if !exists { | ||
return errors.New("expected piece key not found in dictionary") | ||
} | ||
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pieceIndexInt, ok := pieceIndex.(int64) | ||
if !ok { | ||
return errors.New("expected value for piece key to be an integer") | ||
} | ||
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if pieceIndexInt != 0 { | ||
return fmt.Errorf("expected piece key with value=0, actual value=%v", pieceIndex) | ||
} | ||
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return nil | ||
} | ||
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func sendMetadataResponse(conn net.Conn, metadataExtensionID uint8, magnetLink MagnetTestTorrentInfo, logger *logger.Logger) error { | ||
defer conn.SetDeadline(time.Time{}) // Disable the deadline | ||
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logger.Debugln("Sending metadata response") | ||
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info := TorrentFileInfo{ | ||
Name: magnetLink.Filename, | ||
Length: magnetLink.FileLengthBytes, | ||
Pieces: toPiecesStr(magnetLink.PieceHashes), | ||
PieceLength: magnetLink.PieceLengthBytes, | ||
} | ||
m, err := createMetadataDataMessage(metadataExtensionID, magnetLink.MetadataSizeBytes, 0, info, logger) | ||
if err != nil { | ||
return err | ||
} | ||
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bytes := m.Serialize() | ||
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conn.SetDeadline(time.Now().Add(3 * time.Second)) | ||
_, err = conn.Write(bytes) | ||
if err != nil { | ||
return fmt.Errorf("error sending metadata response: %v", err) | ||
} | ||
return nil | ||
} |