1e891b4e0b
Rather than converting the proof of work limit to its compact representation multiple times during operation, do it once at package initialization time and export it via the chain parameters.
94 lines
3 KiB
Go
94 lines
3 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 btcchain
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import (
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"github.com/conformal/btcwire"
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"math/big"
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)
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// Params houses parameters unique to various bitcoin networks such as the main
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// network and test networks. See ChainParams.
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type Params struct {
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// GenesisBlock is the genesis block for the specific network.
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GenesisBlock *btcwire.MsgBlock
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// GenesisHash is the genesis block hash for the specific network.
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GenesisHash *btcwire.ShaHash
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// PowLimit is the highest proof of work value a bitcoin block can have
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// for the specific network.
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PowLimit *big.Int
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// PowLimitBits is the highest proof of work value a bitcoin block can
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// have represented in compact form. See CompactToBig for more details
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// on compact form.
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PowLimitBits uint32
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}
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// mainPowLimit is the highest proof of work value a bitcoin block can have for
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// the main network. It is the value 2^224 - 1.
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var mainPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
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// mainNetParams contains parameters specific to the main network
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// (btcwire.MainNet).
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var mainNetParams = Params{
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GenesisBlock: &btcwire.GenesisBlock,
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GenesisHash: &btcwire.GenesisHash,
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PowLimit: mainPowLimit,
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PowLimitBits: BigToCompact(mainPowLimit),
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}
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// regressionPowLimit is the highest proof of work value a bitcoin block can
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// have. It is the value 2^256 - 1.
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var regressionPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 255), bigOne)
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// regressionParams contains parameters specific to the regression test network
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// (btcwire.TestNet).
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var regressionParams = Params{
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GenesisBlock: &btcwire.TestNetGenesisBlock,
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GenesisHash: &btcwire.TestNetGenesisHash,
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PowLimit: regressionPowLimit,
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PowLimitBits: BigToCompact(regressionPowLimit),
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}
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// testNetPowLimit is the highest proof of work value a bitcoin block can have
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// for the test network (version 3). It is the value 2^224 - 1.
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var testNetPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
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// testNet3Params contains parameters specific to the test network (version 3)
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// (btcwire.TestNet3).
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var testNet3Params = Params{
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GenesisBlock: &btcwire.TestNet3GenesisBlock,
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GenesisHash: &btcwire.TestNet3GenesisHash,
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PowLimit: testNetPowLimit,
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PowLimitBits: BigToCompact(testNetPowLimit),
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}
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// chainParams returns chain parameters specific to the bitcoin network
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// associated with the BlockChain instance.
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func (b *BlockChain) chainParams() *Params {
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return ChainParams(b.btcnet)
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}
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// ChainParams returns chain parameters specific to the passed bitcoin network.
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// It returns the parameters for btcwire.MainNet if the passed network is not
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// supported.
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func ChainParams(btcnet btcwire.BitcoinNet) *Params {
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switch btcnet {
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case btcwire.TestNet:
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return ®ressionParams
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case btcwire.TestNet3:
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return &testNet3Params
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// Return main net by default.
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case btcwire.MainNet:
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fallthrough
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default:
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return &mainNetParams
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}
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}
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