9c6dfab8da
This makes messages maximum payload length calculations accurate. In wire messages which contain arrays, the array items counter is variable integer (varInt). Since we limit items count in the arrays, the maximum size of these counters is limited, this causes these counters encoded size in all cases be lower than maximum integer encoded size (MaxVarIntPayload). This commit makes this calculations accurate and makes them consistent with the rest of the codebase.
268 lines
7.6 KiB
Go
268 lines
7.6 KiB
Go
// Copyright (c) 2013-2016 The btcsuite developers
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// Copyright (c) 2015-2019 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package wire
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import (
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"bytes"
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"io"
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"reflect"
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"testing"
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"github.com/davecgh/go-spew/spew"
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"github.com/decred/dcrd/chaincfg/chainhash"
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)
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// TestInv tests the MsgInv API.
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func TestInv(t *testing.T) {
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pver := ProtocolVersion
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// Ensure the command is expected value.
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wantCmd := "inv"
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msg := NewMsgInv()
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if cmd := msg.Command(); cmd != wantCmd {
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t.Errorf("NewMsgInv: wrong command - got %v want %v",
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cmd, wantCmd)
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}
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// Ensure max payload is expected value for latest protocol version.
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// Num inventory vectors (varInt) 3 bytes + max allowed inventory vectors.
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wantPayload := uint32(1800003)
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maxPayload := msg.MaxPayloadLength(pver)
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if maxPayload != wantPayload {
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t.Errorf("MaxPayloadLength: wrong max payload length for "+
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"protocol version %d - got %v, want %v", pver,
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maxPayload, wantPayload)
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}
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// Ensure inventory vectors are added properly.
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hash := chainhash.Hash{}
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iv := NewInvVect(InvTypeBlock, &hash)
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err := msg.AddInvVect(iv)
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if err != nil {
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t.Errorf("AddInvVect: %v", err)
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}
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if msg.InvList[0] != iv {
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t.Errorf("AddInvVect: wrong invvect added - got %v, want %v",
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spew.Sprint(msg.InvList[0]), spew.Sprint(iv))
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}
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// Ensure adding more than the max allowed inventory vectors per
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// message returns an error.
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for i := 0; i < MaxInvPerMsg; i++ {
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err = msg.AddInvVect(iv)
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}
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if err == nil {
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t.Errorf("AddInvVect: expected error on too many inventory " +
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"vectors not received")
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}
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// Ensure creating the message with a size hint larger than the max
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// works as expected.
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msg = NewMsgInvSizeHint(MaxInvPerMsg + 1)
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wantCap := MaxInvPerMsg
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if cap(msg.InvList) != wantCap {
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t.Errorf("NewMsgInvSizeHint: wrong cap for size hint - "+
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"got %v, want %v", cap(msg.InvList), wantCap)
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}
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}
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// TestInvWire tests the MsgInv wire encode and decode for various numbers
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// of inventory vectors and protocol versions.
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func TestInvWire(t *testing.T) {
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// Block 203707 hash.
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hashStr := "3264bc2ac36a60840790ba1d475d01367e7c723da941069e9dc"
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blockHash, err := chainhash.NewHashFromStr(hashStr)
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if err != nil {
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t.Errorf("NewHashFromStr: %v", err)
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}
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// Transaction 1 of Block 203707 hash.
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hashStr = "d28a3dc7392bf00a9855ee93dd9a81eff82a2c4fe57fbd42cfe71b487accfaf0"
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txHash, err := chainhash.NewHashFromStr(hashStr)
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if err != nil {
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t.Errorf("NewHashFromStr: %v", err)
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}
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iv := NewInvVect(InvTypeBlock, blockHash)
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iv2 := NewInvVect(InvTypeTx, txHash)
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// Empty inv message.
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NoInv := NewMsgInv()
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NoInvEncoded := []byte{
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0x00, // Varint for number of inventory vectors
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}
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// Inv message with multiple inventory vectors.
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MultiInv := NewMsgInv()
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MultiInv.AddInvVect(iv)
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MultiInv.AddInvVect(iv2)
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MultiInvEncoded := []byte{
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0x02, // Varint for number of inv vectors
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0x02, 0x00, 0x00, 0x00, // InvTypeBlock
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0xdc, 0xe9, 0x69, 0x10, 0x94, 0xda, 0x23, 0xc7,
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0xe7, 0x67, 0x13, 0xd0, 0x75, 0xd4, 0xa1, 0x0b,
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0x79, 0x40, 0x08, 0xa6, 0x36, 0xac, 0xc2, 0x4b,
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0x26, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Block 203707 hash
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0x01, 0x00, 0x00, 0x00, // InvTypeTx
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0xf0, 0xfa, 0xcc, 0x7a, 0x48, 0x1b, 0xe7, 0xcf,
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0x42, 0xbd, 0x7f, 0xe5, 0x4f, 0x2c, 0x2a, 0xf8,
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0xef, 0x81, 0x9a, 0xdd, 0x93, 0xee, 0x55, 0x98,
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0x0a, 0xf0, 0x2b, 0x39, 0xc7, 0x3d, 0x8a, 0xd2, // Tx 1 of block 203707 hash
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}
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tests := []struct {
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in *MsgInv // Message to encode
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out *MsgInv // Expected decoded message
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buf []byte // Wire encoding
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pver uint32 // Protocol version for wire encoding
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}{
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// Latest protocol version with no inv vectors.
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{
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NoInv,
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NoInv,
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NoInvEncoded,
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ProtocolVersion,
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},
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// Latest protocol version with multiple inv vectors.
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{
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MultiInv,
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MultiInv,
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MultiInvEncoded,
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ProtocolVersion,
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},
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}
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t.Logf("Running %d tests", len(tests))
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for i, test := range tests {
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// Encode the message to wire format.
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var buf bytes.Buffer
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err := test.in.BtcEncode(&buf, test.pver)
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if err != nil {
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t.Errorf("BtcEncode #%d error %v", i, err)
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continue
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}
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if !bytes.Equal(buf.Bytes(), test.buf) {
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t.Errorf("BtcEncode #%d\n got: %s want: %s", i,
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spew.Sdump(buf.Bytes()), spew.Sdump(test.buf))
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continue
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}
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// Decode the message from wire format.
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var msg MsgInv
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rbuf := bytes.NewReader(test.buf)
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err = msg.BtcDecode(rbuf, test.pver)
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if err != nil {
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t.Errorf("BtcDecode #%d error %v", i, err)
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continue
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}
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if !reflect.DeepEqual(&msg, test.out) {
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t.Errorf("BtcDecode #%d\n got: %s want: %s", i,
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spew.Sdump(msg), spew.Sdump(test.out))
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continue
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}
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}
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}
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// TestInvWireErrors performs negative tests against wire encode and decode
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// of MsgInv to confirm error paths work correctly.
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func TestInvWireErrors(t *testing.T) {
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pver := ProtocolVersion
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wireErr := &MessageError{}
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// Block 203707 hash.
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hashStr := "3264bc2ac36a60840790ba1d475d01367e7c723da941069e9dc"
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blockHash, err := chainhash.NewHashFromStr(hashStr)
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if err != nil {
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t.Errorf("NewHashFromStr: %v", err)
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}
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iv := NewInvVect(InvTypeBlock, blockHash)
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// Base inv message used to induce errors.
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baseInv := NewMsgInv()
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baseInv.AddInvVect(iv)
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baseInvEncoded := []byte{
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0x02, // Varint for number of inv vectors
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0x02, 0x00, 0x00, 0x00, // InvTypeBlock
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0xdc, 0xe9, 0x69, 0x10, 0x94, 0xda, 0x23, 0xc7,
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0xe7, 0x67, 0x13, 0xd0, 0x75, 0xd4, 0xa1, 0x0b,
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0x79, 0x40, 0x08, 0xa6, 0x36, 0xac, 0xc2, 0x4b,
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0x26, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Block 203707 hash
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}
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// Inv message that forces an error by having more than the max allowed
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// inv vectors.
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maxInv := NewMsgInv()
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for i := 0; i < MaxInvPerMsg; i++ {
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maxInv.AddInvVect(iv)
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}
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maxInv.InvList = append(maxInv.InvList, iv)
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maxInvEncoded := []byte{
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0xfd, 0x51, 0xc3, // Varint for number of inv vectors (50001)
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}
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tests := []struct {
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in *MsgInv // Value to encode
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buf []byte // Wire encoding
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pver uint32 // Protocol version for wire encoding
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max int // Max size of fixed buffer to induce errors
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writeErr error // Expected write error
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readErr error // Expected read error
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}{
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// Latest protocol version with intentional read/write errors.
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// Force error in inventory vector count
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{baseInv, baseInvEncoded, pver, 0, io.ErrShortWrite, io.EOF},
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// Force error in inventory list.
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{baseInv, baseInvEncoded, pver, 1, io.ErrShortWrite, io.EOF},
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// Force error with greater than max inventory vectors.
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{maxInv, maxInvEncoded, pver, 3, wireErr, wireErr},
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}
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t.Logf("Running %d tests", len(tests))
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for i, test := range tests {
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// Encode to wire format.
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w := newFixedWriter(test.max)
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err := test.in.BtcEncode(w, test.pver)
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if reflect.TypeOf(err) != reflect.TypeOf(test.writeErr) {
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t.Errorf("BtcEncode #%d wrong error got: %v, want: %v",
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i, err, test.writeErr)
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continue
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}
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// For errors which are not of type MessageError, check them for
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// equality.
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if _, ok := err.(*MessageError); !ok {
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if err != test.writeErr {
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t.Errorf("BtcEncode #%d wrong error got: %v, "+
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"want: %v", i, err, test.writeErr)
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continue
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}
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}
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// Decode from wire format.
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var msg MsgInv
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r := newFixedReader(test.max, test.buf)
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err = msg.BtcDecode(r, test.pver)
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if reflect.TypeOf(err) != reflect.TypeOf(test.readErr) {
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t.Errorf("BtcDecode #%d wrong error got: %v, want: %v",
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i, err, test.readErr)
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continue
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}
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// For errors which are not of type MessageError, check them for
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// equality.
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if _, ok := err.(*MessageError); !ok {
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if err != test.readErr {
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t.Errorf("BtcDecode #%d wrong error got: %v, "+
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"want: %v", i, err, test.readErr)
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continue
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}
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}
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}
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}
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