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50 lines
1.4 KiB
50 lines
1.4 KiB
package blockfactory
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import (
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"math/big"
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"github.com/harmony-one/harmony/block"
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blockif "github.com/harmony-one/harmony/block/interface"
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v0 "github.com/harmony-one/harmony/block/v0"
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v1 "github.com/harmony-one/harmony/block/v1"
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"github.com/harmony-one/harmony/internal/params"
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)
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// Factory is a data structure factory for a specific chain configuration.
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type Factory interface {
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// NewHeader creates a new, empty header object for the given epoch.
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NewHeader(epoch *big.Int) *block.Header
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}
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type factory struct {
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chainConfig *params.ChainConfig
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}
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// NewFactory creates a new factory for the given chain configuration.
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func NewFactory(chainConfig *params.ChainConfig) Factory {
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return &factory{chainConfig: chainConfig}
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}
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func (f *factory) NewHeader(epoch *big.Int) *block.Header {
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var impl blockif.Header
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switch {
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case epoch.Cmp(f.chainConfig.CrossLinkEpoch) >= 0:
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impl = v1.NewHeader()
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default:
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impl = v0.NewHeader()
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}
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return &block.Header{impl}
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}
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// Factories corresponding to well-known chain configurations.
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var (
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ForTest = NewFactory(params.TestChainConfig)
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ForTestnet = NewFactory(params.TestnetChainConfig)
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ForMainnet = NewFactory(params.MainnetChainConfig)
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)
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// NewTestHeader creates a new, empty header object for epoch 0 using the test
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// factory. Use for unit tests.
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func NewTestHeader() *block.Header {
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return ForTest.NewHeader(new(big.Int))
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}
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