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208 lines
4.9 KiB
208 lines
4.9 KiB
// Copyright 2017 Tendermint. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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package trust
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import (
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"encoding/json"
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"fmt"
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"sync"
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"time"
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"github.com/tendermint/tendermint/libs/service"
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dbm "github.com/tendermint/tm-db"
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)
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const defaultStorePeriodicSaveInterval = 1 * time.Minute
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var trustMetricKey = []byte("trustMetricStore")
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// MetricStore - Manages all trust metrics for peers
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type MetricStore struct {
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service.BaseService
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// Maps a Peer.Key to that peer's TrustMetric
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peerMetrics map[string]*Metric
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// Mutex that protects the map and history data file
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mtx sync.Mutex
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// The db where peer trust metric history data will be stored
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db dbm.DB
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// This configuration will be used when creating new TrustMetrics
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config MetricConfig
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}
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// NewTrustMetricStore returns a store that saves data to the DB
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// and uses the config when creating new trust metrics.
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// Use Start to to initialize the trust metric store
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func NewTrustMetricStore(db dbm.DB, tmc MetricConfig) *MetricStore {
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tms := &MetricStore{
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peerMetrics: make(map[string]*Metric),
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db: db,
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config: tmc,
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}
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tms.BaseService = *service.NewBaseService(nil, "MetricStore", tms)
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return tms
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}
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// OnStart implements Service
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func (tms *MetricStore) OnStart() error {
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if err := tms.BaseService.OnStart(); err != nil {
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return err
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}
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tms.mtx.Lock()
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defer tms.mtx.Unlock()
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tms.loadFromDB()
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go tms.saveRoutine()
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return nil
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}
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// OnStop implements Service
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func (tms *MetricStore) OnStop() {
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tms.BaseService.OnStop()
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tms.mtx.Lock()
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defer tms.mtx.Unlock()
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// Stop all trust metric go-routines
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for _, tm := range tms.peerMetrics {
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tm.Stop()
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}
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// Make the final trust history data save
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tms.saveToDB()
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}
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// Size returns the number of entries in the trust metric store
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func (tms *MetricStore) Size() int {
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tms.mtx.Lock()
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defer tms.mtx.Unlock()
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return tms.size()
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}
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// AddPeerTrustMetric takes an existing trust metric and associates it with a peer key.
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// The caller is expected to call Start on the TrustMetric being added
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func (tms *MetricStore) AddPeerTrustMetric(key string, tm *Metric) {
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tms.mtx.Lock()
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defer tms.mtx.Unlock()
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if key == "" || tm == nil {
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return
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}
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tms.peerMetrics[key] = tm
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}
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// GetPeerTrustMetric returns a trust metric by peer key
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func (tms *MetricStore) GetPeerTrustMetric(key string) *Metric {
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tms.mtx.Lock()
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defer tms.mtx.Unlock()
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tm, ok := tms.peerMetrics[key]
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if !ok {
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// If the metric is not available, we will create it
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tm = NewMetricWithConfig(tms.config)
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tm.Start()
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// The metric needs to be in the map
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tms.peerMetrics[key] = tm
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}
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return tm
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}
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// PeerDisconnected pauses the trust metric associated with the peer identified by the key
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func (tms *MetricStore) PeerDisconnected(key string) {
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tms.mtx.Lock()
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defer tms.mtx.Unlock()
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// If the Peer that disconnected has a metric, pause it
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if tm, ok := tms.peerMetrics[key]; ok {
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tm.Pause()
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}
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}
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// Saves the history data for all peers to the store DB.
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// This public method acquires the trust metric store lock
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func (tms *MetricStore) SaveToDB() {
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tms.mtx.Lock()
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defer tms.mtx.Unlock()
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tms.saveToDB()
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}
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/* Private methods */
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// size returns the number of entries in the store without acquiring the mutex
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func (tms *MetricStore) size() int {
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return len(tms.peerMetrics)
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}
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/* Loading & Saving */
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/* Both loadFromDB and savetoDB assume the mutex has been acquired */
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// Loads the history data for all peers from the store DB
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// cmn.Panics if file is corrupt
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func (tms *MetricStore) loadFromDB() bool {
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// Obtain the history data we have so far
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bytes := tms.db.Get(trustMetricKey)
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if bytes == nil {
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return false
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}
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peers := make(map[string]MetricHistoryJSON)
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err := json.Unmarshal(bytes, &peers)
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if err != nil {
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panic(fmt.Sprintf("Could not unmarshal Trust Metric Store DB data: %v", err))
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}
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// If history data exists in the file,
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// load it into trust metric
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for key, p := range peers {
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tm := NewMetricWithConfig(tms.config)
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tm.Start()
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tm.Init(p)
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// Load the peer trust metric into the store
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tms.peerMetrics[key] = tm
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}
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return true
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}
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// Saves the history data for all peers to the store DB
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func (tms *MetricStore) saveToDB() {
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tms.Logger.Debug("Saving TrustHistory to DB", "size", tms.size())
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peers := make(map[string]MetricHistoryJSON)
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for key, tm := range tms.peerMetrics {
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// Add an entry for the peer identified by key
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peers[key] = tm.HistoryJSON()
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}
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// Write all the data back to the DB
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bytes, err := json.Marshal(peers)
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if err != nil {
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tms.Logger.Error("Failed to encode the TrustHistory", "err", err)
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return
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}
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tms.db.SetSync(trustMetricKey, bytes)
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}
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// Periodically saves the trust history data to the DB
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func (tms *MetricStore) saveRoutine() {
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t := time.NewTicker(defaultStorePeriodicSaveInterval)
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defer t.Stop()
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loop:
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for {
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select {
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case <-t.C:
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tms.SaveToDB()
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case <-tms.Quit():
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break loop
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}
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}
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}
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