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152 lines
3.7 KiB
152 lines
3.7 KiB
package lite
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import (
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"encoding/hex"
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"sort"
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"sync"
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liteErr "github.com/tendermint/tendermint/lite/errors"
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)
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type memStoreProvider struct {
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mtx sync.RWMutex
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// byHeight is always sorted by Height... need to support range search (nil, h]
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// btree would be more efficient for larger sets
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byHeight fullCommits
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byHash map[string]FullCommit
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sorted bool
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}
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// fullCommits just exists to allow easy sorting
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type fullCommits []FullCommit
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func (s fullCommits) Len() int { return len(s) }
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func (s fullCommits) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func (s fullCommits) Less(i, j int) bool {
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return s[i].Height() < s[j].Height()
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}
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// NewMemStoreProvider returns a new in-memory provider.
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func NewMemStoreProvider() Provider {
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return &memStoreProvider{
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byHeight: fullCommits{},
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byHash: map[string]FullCommit{},
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}
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}
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func (m *memStoreProvider) encodeHash(hash []byte) string {
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return hex.EncodeToString(hash)
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}
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// StoreCommit stores a FullCommit after verifying it.
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func (m *memStoreProvider) StoreCommit(fc FullCommit) error {
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// make sure the fc is self-consistent before saving
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err := fc.ValidateBasic(fc.Commit.Header.ChainID)
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if err != nil {
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return err
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}
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// store the valid fc
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key := m.encodeHash(fc.ValidatorsHash())
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m.mtx.Lock()
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defer m.mtx.Unlock()
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m.byHash[key] = fc
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m.byHeight = append(m.byHeight, fc)
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m.sorted = false
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return nil
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}
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// GetByHeight returns the FullCommit for height h or an error if the commit is not found.
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func (m *memStoreProvider) GetByHeight(h int64) (FullCommit, error) {
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// By heuristics, GetByHeight with linearsearch is fast enough
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// for about 50 keys but after that, it needs binary search.
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// See https://github.com/tendermint/tendermint/pull/1043#issue-285188242
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m.mtx.RLock()
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n := len(m.byHeight)
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m.mtx.RUnlock()
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if n <= 50 {
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return m.getByHeightLinearSearch(h)
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}
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return m.getByHeightBinarySearch(h)
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}
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func (m *memStoreProvider) sortByHeightIfNecessaryLocked() {
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if !m.sorted {
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sort.Sort(m.byHeight)
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m.sorted = true
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}
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}
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func (m *memStoreProvider) getByHeightLinearSearch(h int64) (FullCommit, error) {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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m.sortByHeightIfNecessaryLocked()
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// search from highest to lowest
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for i := len(m.byHeight) - 1; i >= 0; i-- {
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if fc := m.byHeight[i]; fc.Height() <= h {
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return fc, nil
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}
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}
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return FullCommit{}, liteErr.ErrCommitNotFound()
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}
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func (m *memStoreProvider) getByHeightBinarySearch(h int64) (FullCommit, error) {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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m.sortByHeightIfNecessaryLocked()
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low, high := 0, len(m.byHeight)-1
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var mid int
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var hmid int64
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var midFC FullCommit
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// Our goal is to either find:
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// * item ByHeight with the query
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// * greatest height with a height <= query
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for low <= high {
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mid = int(uint(low+high) >> 1) // Avoid an overflow
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midFC = m.byHeight[mid]
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hmid = midFC.Height()
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switch {
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case hmid == h:
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return midFC, nil
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case hmid < h:
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low = mid + 1
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case hmid > h:
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high = mid - 1
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}
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}
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if high >= 0 {
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if highFC := m.byHeight[high]; highFC.Height() < h {
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return highFC, nil
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}
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}
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return FullCommit{}, liteErr.ErrCommitNotFound()
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}
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// GetByHash returns the FullCommit for the hash or an error if the commit is not found.
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func (m *memStoreProvider) GetByHash(hash []byte) (FullCommit, error) {
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m.mtx.RLock()
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defer m.mtx.RUnlock()
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fc, ok := m.byHash[m.encodeHash(hash)]
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if !ok {
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return fc, liteErr.ErrCommitNotFound()
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}
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return fc, nil
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}
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// LatestCommit returns the latest FullCommit or an error if no commits exist.
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func (m *memStoreProvider) LatestCommit() (FullCommit, error) {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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l := len(m.byHeight)
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if l == 0 {
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return FullCommit{}, liteErr.ErrCommitNotFound()
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}
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m.sortByHeightIfNecessaryLocked()
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return m.byHeight[l-1], nil
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}
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