128 lines
2.9 KiB
Go
128 lines
2.9 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
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// See LICENSE for copying information.
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package overlay
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import (
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"context"
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"time"
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"github.com/zeebo/errs"
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"go.uber.org/zap"
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monkit "gopkg.in/spacemonkeygo/monkit.v2"
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"storj.io/storj/pkg/kademlia"
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"storj.io/storj/pkg/pb"
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"storj.io/storj/pkg/provider"
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"storj.io/storj/pkg/utils"
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"storj.io/storj/storage"
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"storj.io/storj/storage/boltdb"
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"storj.io/storj/storage/redis"
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)
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var (
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mon = monkit.Package()
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// Error represents an overlay error
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Error = errs.Class("overlay error")
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)
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// Config is a configuration struct for everything you need to start the
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// Overlay cache responsibility.
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type Config struct {
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DatabaseURL string `help:"the database connection string to use" default:"bolt://$CONFDIR/overlay.db"`
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RefreshInterval time.Duration `help:"the interval at which the cache refreshes itself in seconds" default:"1s"`
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}
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// CtxKey used for assigning cache and server
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type CtxKey int
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const (
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ctxKeyOverlay CtxKey = iota
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ctxKeyOverlayServer
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)
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// Run implements the provider.Responsibility interface. Run assumes a
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// Kademlia responsibility has been started before this one.
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func (c Config) Run(ctx context.Context, server *provider.Provider) (
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err error) {
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defer mon.Task()(&ctx)(&err)
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kad := kademlia.LoadFromContext(ctx)
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if kad == nil {
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return Error.New("programmer error: kademlia responsibility unstarted")
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}
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dburl, err := utils.ParseURL(c.DatabaseURL)
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if err != nil {
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return Error.Wrap(err)
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}
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var db storage.KeyValueStore
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switch dburl.Scheme {
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case "bolt":
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db, err = boltdb.New(dburl.Path, OverlayBucket)
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if err != nil {
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return err
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}
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zap.S().Info("Starting overlay cache with BoltDB")
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case "redis":
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db, err = redis.NewClientFrom(c.DatabaseURL)
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if err != nil {
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return err
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}
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zap.S().Info("Starting overlay cache with Redis")
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default:
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return Error.New("database scheme not supported: %s", dburl.Scheme)
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}
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cache := NewOverlayCache(db, kad)
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go func() {
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err = cache.Bootstrap(ctx)
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if err != nil {
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panic(err)
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}
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}()
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ticker := time.NewTicker(c.RefreshInterval)
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defer ticker.Stop()
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go func() {
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for {
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select {
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case <-ticker.C:
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err := cache.Refresh(ctx)
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if err != nil {
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zap.L().Error("Error with cache refresh: ", zap.Error(err))
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}
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case <-ctx.Done():
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return
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}
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}
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}()
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srv := NewServer(zap.L(), cache, kad)
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pb.RegisterOverlayServer(server.GRPC(), srv)
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ctx2 := context.WithValue(ctx, ctxKeyOverlay, cache)
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ctx2 = context.WithValue(ctx2, ctxKeyOverlayServer, srv)
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return server.Run(ctx2)
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}
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// LoadFromContext gives access to the cache from the context, or returns nil
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func LoadFromContext(ctx context.Context) *Cache {
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if v, ok := ctx.Value(ctxKeyOverlay).(*Cache); ok {
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return v
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}
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return nil
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}
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// LoadServerFromContext gives access to the overlay server from the context, or returns nil
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func LoadServerFromContext(ctx context.Context) *Server {
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if v, ok := ctx.Value(ctxKeyOverlayServer).(*Server); ok {
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return v
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}
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return nil
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}
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