9ee6a8aeb6
This commit modifies the writeElement function to have a "fast path" which uses type assertions for all of the types which btcwire write so the more expensive reflection-based binary.Write can be avoided. Also, this changes all cases that were writing raw ShaHash (32-byte) arrays (which requires a stack copy) instead simply passing the pointer. The following benchmark results show the results for serializing a block header after these changes: Before: BenchmarkWriteBlockHeader 500000 5566 ns/op After: BenchmarkWriteBlockHeader 1000000 991 ns/op This is part of the ongoing effort to optimize serialization as noted in conformal/btcd#27.
80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
// Copyright (c) 2013 Conformal Systems LLC.
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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 btcwire
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import (
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"fmt"
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"io"
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)
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const (
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// MaxInvPerMsg is the maximum number of inventory vectors that can be in a
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// single bitcoin inv message.
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MaxInvPerMsg = 50000
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// Maximum payload size for an inventory vector.
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maxInvVectPayload = 4 + HashSize
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)
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// InvType represents the allowed types of inventory vectors. See InvVect.
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type InvType uint32
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// These constants define the various supported inventory vector types.
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const (
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InvTypeError InvType = 0
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InvTypeTx InvType = 1
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InvTypeBlock InvType = 2
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)
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// Map of service flags back to their constant names for pretty printing.
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var ivStrings = map[InvType]string{
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InvTypeError: "ERROR",
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InvTypeTx: "MSG_TX",
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InvTypeBlock: "MSG_BLOCK",
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}
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// String returns the InvType in human-readable form.
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func (invtype InvType) String() string {
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if s, ok := ivStrings[invtype]; ok {
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return s
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}
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return fmt.Sprintf("Unknown InvType (%d)", uint32(invtype))
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}
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// InvVect defines a bitcoin inventory vector which is used to describe data,
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// as specified by the Type field, that a peer wants, has, or does not have to
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// another peer.
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type InvVect struct {
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Type InvType // Type of data
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Hash ShaHash // Hash of the data
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}
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// NewInvVect returns a new InvVect using the provided type and hash.
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func NewInvVect(typ InvType, hash *ShaHash) *InvVect {
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return &InvVect{
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Type: typ,
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Hash: *hash,
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}
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}
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// readInvVect reads an encoded InvVect from r depending on the protocol
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// version.
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func readInvVect(r io.Reader, pver uint32, iv *InvVect) error {
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err := readElements(r, &iv.Type, &iv.Hash)
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if err != nil {
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return err
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}
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return nil
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}
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// writeInvVect serializes an InvVect to w depending on the protocol version.
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func writeInvVect(w io.Writer, pver uint32, iv *InvVect) error {
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err := writeElements(w, iv.Type, &iv.Hash)
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if err != nil {
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return err
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}
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return nil
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}
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