9918e2a561
The github markdown interpreter has been changed such that it no longer allows spaces in between the brackets and parenthesis of links and now requires a newline in between anchors and other formatting. This updates all of the markdown files accordingly. While here, it also corrects a couple of inconsistencies in some of the README.md files.
112 lines
3.9 KiB
Markdown
112 lines
3.9 KiB
Markdown
wire
|
|
====
|
|
|
|
[](https://travis-ci.org/btcsuite/btcd)
|
|
[](http://copyfree.org)
|
|
[](http://godoc.org/github.com/btcsuite/btcd/wire)
|
|
|
|
Package wire implements the bitcoin wire protocol. A comprehensive suite of
|
|
tests with 100% test coverage is provided to ensure proper functionality.
|
|
|
|
There is an associated blog post about the release of this package
|
|
[here](https://blog.conformal.com/btcwire-the-bitcoin-wire-protocol-package-from-btcd/).
|
|
|
|
This package has intentionally been designed so it can be used as a standalone
|
|
package for any projects needing to interface with bitcoin peers at the wire
|
|
protocol level.
|
|
|
|
## Installation and Updating
|
|
|
|
```bash
|
|
$ go get -u github.com/btcsuite/btcd/wire
|
|
```
|
|
|
|
## Bitcoin Message Overview
|
|
|
|
The bitcoin protocol consists of exchanging messages between peers. Each message
|
|
is preceded by a header which identifies information about it such as which
|
|
bitcoin network it is a part of, its type, how big it is, and a checksum to
|
|
verify validity. All encoding and decoding of message headers is handled by this
|
|
package.
|
|
|
|
To accomplish this, there is a generic interface for bitcoin messages named
|
|
`Message` which allows messages of any type to be read, written, or passed
|
|
around through channels, functions, etc. In addition, concrete implementations
|
|
of most of the currently supported bitcoin messages are provided. For these
|
|
supported messages, all of the details of marshalling and unmarshalling to and
|
|
from the wire using bitcoin encoding are handled so the caller doesn't have to
|
|
concern themselves with the specifics.
|
|
|
|
## Reading Messages Example
|
|
|
|
In order to unmarshal bitcoin messages from the wire, use the `ReadMessage`
|
|
function. It accepts any `io.Reader`, but typically this will be a `net.Conn`
|
|
to a remote node running a bitcoin peer. Example syntax is:
|
|
|
|
```Go
|
|
// Use the most recent protocol version supported by the package and the
|
|
// main bitcoin network.
|
|
pver := wire.ProtocolVersion
|
|
btcnet := wire.MainNet
|
|
|
|
// Reads and validates the next bitcoin message from conn using the
|
|
// protocol version pver and the bitcoin network btcnet. The returns
|
|
// are a wire.Message, a []byte which contains the unmarshalled
|
|
// raw payload, and a possible error.
|
|
msg, rawPayload, err := wire.ReadMessage(conn, pver, btcnet)
|
|
if err != nil {
|
|
// Log and handle the error
|
|
}
|
|
```
|
|
|
|
See the package documentation for details on determining the message type.
|
|
|
|
## Writing Messages Example
|
|
|
|
In order to marshal bitcoin messages to the wire, use the `WriteMessage`
|
|
function. It accepts any `io.Writer`, but typically this will be a `net.Conn`
|
|
to a remote node running a bitcoin peer. Example syntax to request addresses
|
|
from a remote peer is:
|
|
|
|
```Go
|
|
// Use the most recent protocol version supported by the package and the
|
|
// main bitcoin network.
|
|
pver := wire.ProtocolVersion
|
|
btcnet := wire.MainNet
|
|
|
|
// Create a new getaddr bitcoin message.
|
|
msg := wire.NewMsgGetAddr()
|
|
|
|
// Writes a bitcoin message msg to conn using the protocol version
|
|
// pver, and the bitcoin network btcnet. The return is a possible
|
|
// error.
|
|
err := wire.WriteMessage(conn, msg, pver, btcnet)
|
|
if err != nil {
|
|
// Log and handle the error
|
|
}
|
|
```
|
|
|
|
## GPG Verification Key
|
|
|
|
All official release tags are signed by Conformal so users can ensure the code
|
|
has not been tampered with and is coming from the btcsuite developers. To
|
|
verify the signature perform the following:
|
|
|
|
- Download the public key from the Conformal website at
|
|
https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
|
|
|
|
- Import the public key into your GPG keyring:
|
|
```bash
|
|
gpg --import GIT-GPG-KEY-conformal.txt
|
|
```
|
|
|
|
- Verify the release tag with the following command where `TAG_NAME` is a
|
|
placeholder for the specific tag:
|
|
```bash
|
|
git tag -v TAG_NAME
|
|
```
|
|
|
|
## License
|
|
|
|
Package wire is licensed under the [copyfree](http://copyfree.org) ISC
|
|
License.
|