22c91fa80a
This updates all code in the main package and subpackages to make use of the new chainhash package since the old wire.ShaHash type and functions have been removed in favor of the abstracted package. Also, since this required API changes anyways and the hash algorithm is no longer tied specifically to SHA, all other functions throughout the code base which had "Sha" in their name have been changed to Hash so they are not incorrectly implying the hash algorithm. The following is an overview of the changes: - Update all references to wire.ShaHash to the new chainhash.Hash type - Rename the following functions and update all references: - Block.Sha -> Hash - Block.TxSha -> TxHash - Tx.Sha -> Hash - bloom.Filter.AddShaHash -> AddHash - Rename all variables that included sha in their name to include hash instead - Add license headers to coinset package files |
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|---|---|---|
| .. | ||
| coins.go | ||
| coins_test.go | ||
| cov_report.sh | ||
| README.md | ||
| test_coverage.txt | ||
coinset
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(https://travis-ci.org/btcsuite/btcutil) ![ISC License]
(http://img.shields.io/badge/license-ISC-blue.svg)
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(http://godoc.org/github.com/btcsuite/btcutil/coinset)
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.
Installation and Updating
$ go get -u github.com/btcsuite/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:
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.
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 ISC License.