83 lines
2.6 KiB
Markdown
83 lines
2.6 KiB
Markdown
coinset
|
|
=======
|
|
|
|
[]
|
|
(https://travis-ci.org/conformal/btcutil)
|
|
|
|
Package coinset provides bitcoin-specific convenience functions for selecting
|
|
from and managing sets of unspent transaction outpoints (UTXOs).
|
|
|
|
A comprehensive suite of tests is provided to ensure proper functionality. See
|
|
`test_coverage.txt` for the gocov coverage report. Alternatively, if you are
|
|
running a POSIX OS, you can run the `cov_report.sh` script for a real-time
|
|
report. Package coinset is licensed under the liberal ISC license.
|
|
|
|
## Documentation
|
|
|
|
[]
|
|
(http://godoc.org/github.com/conformal/btcutil/coinset)
|
|
|
|
Full `go doc` style documentation for the project can be viewed online without
|
|
installing this package by using the GoDoc site here:
|
|
http://godoc.org/github.com/conformal/btcutil/coinset
|
|
|
|
You can also view the documentation locally once the package is installed with
|
|
the `godoc` tool by running `godoc -http=":6060"` and pointing your browser to
|
|
http://localhost:6060/pkg/github.com/conformal/btcutil/coinset
|
|
|
|
## Installation
|
|
|
|
```bash
|
|
$ go get github.com/conformal/btcutil/coinset
|
|
```
|
|
|
|
## Usage
|
|
|
|
Each unspent transaction outpoint is represented by the Coin interface. An
|
|
example of a concrete type that implements Coin is coinset.SimpleCoin.
|
|
|
|
The typical use case for this library is for creating raw bitcoin transactions
|
|
given a set of Coins that may be spent by the user, for example as below:
|
|
|
|
```Go
|
|
var unspentCoins = []coinset.Coin{ ... }
|
|
```
|
|
|
|
When the user needs to spend a certain amount, they will need to select a
|
|
subset of these coins which contain at least that value. CoinSelector is
|
|
an interface that represents types that implement coin selection algos,
|
|
subject to various criteria. There are a few examples of CoinSelector's:
|
|
|
|
- MinIndexCoinSelector
|
|
|
|
- MinNumberCoinSelector
|
|
|
|
- MaxValueAgeCoinSelector
|
|
|
|
- MinPriorityCoinSelector
|
|
|
|
For example, if the user wishes to maximize the probability that their
|
|
transaction is mined quickly, they could use the MaxValueAgeCoinSelector to
|
|
select high priority coins, then also attach a relatively high fee.
|
|
|
|
```Go
|
|
selector := &coinset.MaxValueAgeCoinSelector{
|
|
MaxInputs: 10,
|
|
MinAmountChange: 10000,
|
|
}
|
|
selectedCoins, err := selector.CoinSelect(targetAmount + bigFee, unspentCoins)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
msgTx := coinset.NewMsgTxWithInputCoins(selectedCoins)
|
|
...
|
|
|
|
```
|
|
|
|
The user can then create the msgTx.TxOut's as required, then sign the
|
|
transaction and transmit it to the network.
|
|
|
|
## License
|
|
|
|
Package coinset is licensed under the [copyfree](http://copyfree.org) ISC
|
|
License.
|