Thread safe cache with separate ingestor

cmd/server/main.go

@@ -23,6 +23,8 @@ import (
 var log *logrus.Entry
 var logger = logrus.New()
 
+var cacheSize = 10000
+
 func init() {
 	logger.SetFormatter(&logrus.TextFormatter{
 		//DisableColors:          true,
@@ -77,7 +79,6 @@ func loggerFromContext(ctx context.Context) *logrus.Entry {
 
 type Options struct {
 	bindAddr      string `json:"bind_address,omitempty"`
-	dbPath        string `json:"db_path"`
 	tlsCertPath   string `json:"tls_cert_path,omitempty"`
 	tlsKeyPath    string `json:"tls_cert_key,omitempty"`
 	logLevel      uint64 `json:"log_level,omitempty"`
@@ -88,7 +89,6 @@ type Options struct {
 func main() {
 	opts := &Options{}
 	flag.StringVar(&opts.bindAddr, "bind-addr", "127.0.0.1:9067", "the address to listen on")
-	flag.StringVar(&opts.dbPath, "db-path", "", "the path to a sqlite database file")
 	flag.StringVar(&opts.tlsCertPath, "tls-cert", "", "the path to a TLS certificate (optional)")
 	flag.StringVar(&opts.tlsKeyPath, "tls-key", "", "the path to a TLS key file (optional)")
 	flag.Uint64Var(&opts.logLevel, "log-level", uint64(logrus.InfoLevel), "log level (logrus 1-7)")
@@ -98,7 +98,7 @@ func main() {
 	// TODO support config from file and env vars
 	flag.Parse()
 
-	if opts.dbPath == "" || opts.zcashConfPath == "" {
+	if opts.zcashConfPath == "" {
 		flag.Usage()
 		os.Exit(1)
 	}
@@ -161,7 +161,7 @@ func main() {
 	}
 
 	// Get the sapling activation height from the RPC
-	saplingHeight, chainName, branchID, err := common.GetSaplingInfo(rpcClient)
+	saplingHeight, blockHeight, chainName, branchID, err := common.GetSaplingInfo(rpcClient)
 	if err != nil {
 		log.WithFields(logrus.Fields{
 			"error": err,
@@ -170,12 +170,24 @@ func main() {
 
 	log.Info("Got sapling height ", saplingHeight, " chain ", chainName, " branchID ", branchID)
 
+	// Initialize the cache
+	cache := common.NewBlockCache(cacheSize)
+
+	stopChan := make(chan bool, 1)
+
+	// Start the block cache importer at latestblock - 100k(cache size)
+	cacheStart := blockHeight - cacheSize
+	if cacheStart < saplingHeight {
+		cacheStart = saplingHeight
+	}
+
+	go common.BlockIngestor(rpcClient, cache, log, stopChan, cacheStart)
+
 	// Compact transaction service initialization
-	service, err := frontend.NewSQLiteStreamer(rpcClient, log)
+	service, err := frontend.NewSQLiteStreamer(rpcClient, cache, log)
 	if err != nil {
 		log.WithFields(logrus.Fields{
-			"db_path": opts.dbPath,
-			"error":   err,
+			"error": err,
 		}).Fatal("couldn't create SQL backend")
 	}
 	defer service.(*frontend.SqlStreamer).GracefulStop()
@@ -200,7 +212,10 @@ func main() {
 		log.WithFields(logrus.Fields{
 			"signal": s.String(),
 		}).Info("caught signal, stopping gRPC server")
+		// Stop the server
 		server.GracefulStop()
+		// Stop the block ingestor
+		stopChan <- true
 	}()
 
 	log.Infof("Starting gRPC server on %s", opts.bindAddr)

common/cache.go

@@ -2,6 +2,7 @@ package common
 
 import (
 	"bytes"
+	"sync"
 
 	"github.com/adityapk00/lightwalletd/walletrpc"
 	"github.com/pkg/errors"
@@ -14,9 +15,11 @@ type BlockCache struct {
 	LastBlock  int
 
 	m map[int]*walletrpc.CompactBlock
+
+	mutex sync.RWMutex
 }
 
-func New(maxEntries int) *BlockCache {
+func NewBlockCache(maxEntries int) *BlockCache {
 	return &BlockCache{
 		MaxEntries: maxEntries,
 		FirstBlock: -1,
@@ -26,25 +29,18 @@ func New(maxEntries int) *BlockCache {
 }
 
 func (c *BlockCache) Add(height int, block *walletrpc.CompactBlock) error {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
 	//println("Cache add", height)
 	if c.FirstBlock == -1 && c.LastBlock == -1 {
 		// If this is the first block, prep the data structure
 		c.FirstBlock = height
 		c.LastBlock = height - 1
-	} else if height >= c.FirstBlock && height <= c.LastBlock {
-		// Overwriting an existing entry. If so, then remove all
-		// subsequent blocks, since this might be a reorg
-		for i := height; i <= c.LastBlock; i++ {
-			//println("Deleteing at height", i)
-			delete(c.m, i)
-		}
-		c.LastBlock = height - 1
-	}
-
-	if height != c.LastBlock+1 {
-		return errors.New("Blocks need to be added sequentially")
 	}
 
+	// Don't allow out-of-order blocks. This is more of a sanity check than anything
+	// If there is a reorg, then the ingestor needs to handle it.
 	if c.m[height-1] != nil && !bytes.Equal(block.PrevHash, c.m[height-1].Hash) {
 		return errors.New("Prev hash of the block didn't match")
 	}
@@ -66,6 +62,9 @@ func (c *BlockCache) Add(height int, block *walletrpc.CompactBlock) error {
 }
 
 func (c *BlockCache) Get(height int) *walletrpc.CompactBlock {
+	c.mutex.RLock()
+	defer c.mutex.RUnlock()
+
 	//println("Cache get", height)
 	if c.LastBlock == -1 || c.FirstBlock == -1 {
 		return nil
@@ -79,3 +78,10 @@ func (c *BlockCache) Get(height int) *walletrpc.CompactBlock {
 	//println("Cache returned")
 	return c.m[height]
 }
+
+func (c *BlockCache) GetLatestBlock() int {
+	c.mutex.RLock()
+	defer c.mutex.RUnlock()
+
+	return c.LastBlock
+}

common/common.go

@@ -1,19 +1,21 @@
 package common
 
 import (
-	"bytes"
 	"encoding/hex"
 	"encoding/json"
+	"fmt"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/adityapk00/lightwalletd/parser"
 	"github.com/adityapk00/lightwalletd/walletrpc"
 	"github.com/btcsuite/btcd/rpcclient"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
-func GetSaplingInfo(rpcClient *rpcclient.Client) (int, string, string, error) {
+func GetSaplingInfo(rpcClient *rpcclient.Client) (int, int, string, string, error) {
 	result, rpcErr := rpcClient.RawRequest("getblockchaininfo", make([]json.RawMessage, 0))
 
 	var err error
@@ -25,15 +27,15 @@ func GetSaplingInfo(rpcClient *rpcclient.Client) (int, string, string, error) {
 		errCode, err = strconv.ParseInt(errParts[0], 10, 32)
 		//Check to see if we are requesting a height the zcashd doesn't have yet
 		if err == nil && errCode == -8 {
-			return -1, "", "", nil
+			return -1, -1, "", "", nil
 		}
-		return -1, "", "", errors.Wrap(rpcErr, "error requesting block")
+		return -1, -1, "", "", errors.Wrap(rpcErr, "error requesting block")
 	}
 
 	var f interface{}
 	err = json.Unmarshal(result, &f)
 	if err != nil {
-		return -1, "", "", errors.Wrap(err, "error reading JSON response")
+		return -1, -1, "", "", errors.Wrap(err, "error reading JSON response")
 	}
 
 	chainName := f.(map[string]interface{})["chain"].(string)
@@ -42,10 +44,12 @@ func GetSaplingInfo(rpcClient *rpcclient.Client) (int, string, string, error) {
 	saplingJSON := upgradeJSON.(map[string]interface{})["76b809bb"] // Sapling ID
 	saplingHeight := saplingJSON.(map[string]interface{})["activationheight"].(float64)
 
+	blockHeight := f.(map[string]interface{})["headers"].(float64)
+
 	consensus := f.(map[string]interface{})["consensus"]
 	branchID := consensus.(map[string]interface{})["nextblock"].(string)
 
-	return int(saplingHeight), chainName, branchID, nil
+	return int(saplingHeight), int(blockHeight), chainName, branchID, nil
 }
 
 func getBlockFromRPC(rpcClient *rpcclient.Client, height int) (*walletrpc.CompactBlock, error) {
@@ -91,6 +95,78 @@ func getBlockFromRPC(rpcClient *rpcclient.Client, height int) (*walletrpc.Compac
 	return block.ToCompact(), nil
 }
 
+func BlockIngestor(rpcClient *rpcclient.Client, cache *BlockCache, log *logrus.Entry,
+	stopChan chan bool, startHeight int) {
+	reorgCount := -1
+	height := startHeight
+	timeoutCount := 0
+	hash := ""
+	phash := ""
+
+	// Start listening for new blocks
+	for {
+		select {
+		case <-stopChan:
+			break
+
+		case <-time.After(15 * time.Second):
+			for {
+				if reorgCount > 0 {
+					reorgCount = -1
+					height -= 10
+				}
+				block, err := getBlockFromRPC(rpcClient, height)
+
+				if err != nil {
+					log.WithFields(logrus.Fields{
+						"height": height,
+						"error":  err,
+					}).Warn("error with getblock")
+
+					timeoutCount++
+					if timeoutCount == 3 {
+						log.WithFields(logrus.Fields{
+							"timeouts": timeoutCount,
+						}).Warn("unable to issue RPC call to zcashd node 3 times")
+						break
+					}
+				}
+
+				if block != nil {
+					log.Info("Ingestor adding block to cache: ", height)
+					cache.Add(height, block)
+					if timeoutCount > 0 {
+						timeoutCount--
+					}
+
+					phash = hex.EncodeToString(block.PrevHash)
+
+					//check for reorgs once we have inital block hash from startup
+					if hash != phash && reorgCount != -1 {
+						reorgCount++
+						log.WithFields(logrus.Fields{
+							"height":          height,
+							"hash(reversed)":  hash,
+							"phash(reversed)": phash,
+							"reorg":           reorgCount,
+						}).Warn("REORG")
+					} else {
+						hash = hex.EncodeToString(block.Hash)
+					}
+
+					if reorgCount == -1 {
+						hash = hex.EncodeToString(block.Hash)
+						reorgCount = 0
+					}
+					height++
+				} else {
+					break
+				}
+			}
+		}
+	}
+}
+
 func GetBlock(rpcClient *rpcclient.Client, cache *BlockCache, height int) (*walletrpc.CompactBlock, error) {
 	// First, check the cache to see if we have the block
 	block := cache.Get(height)
@@ -98,51 +174,19 @@ func GetBlock(rpcClient *rpcclient.Client, cache *BlockCache, height int) (*wall
 		return block, nil
 	}
 
+	// If a block was not found, make sure user is requesting a historical block
+	if height > cache.GetLatestBlock() {
+		return nil, errors.New(
+			fmt.Sprintf(
+				"Block requested is newer than latest block. Requested: %d Latest: %d",
+				height, cache.GetLatestBlock()))
+	}
+
 	block, err := getBlockFromRPC(rpcClient, height)
 	if err != nil {
 		return nil, err
 	}
 
-	// Store the block in the cache, but test for reorg first
-	prevBlock := cache.Get(height - 1)
-
-	if prevBlock != nil {
-		if !bytes.Equal(prevBlock.Hash, block.PrevHash) {
-			// Reorg!
-			reorgCount := 0
-			cacheBlock := cache.Get(height - reorgCount)
-
-			rpcBlocks := []*walletrpc.CompactBlock{}
-
-			for ; reorgCount <= 100 &&
-				cacheBlock != nil &&
-				!bytes.Equal(block.PrevHash, cacheBlock.Hash); reorgCount++ {
-
-				block, err = getBlockFromRPC(rpcClient, height-reorgCount-1)
-				if err != nil {
-					return nil, err
-				}
-
-				_ = append(rpcBlocks, block)
-
-				cacheBlock = cache.Get(height - reorgCount - 2)
-
-			}
-
-			if reorgCount == 100 {
-				return nil, errors.New("Max reorg depth exceeded")
-			}
-
-			// At this point, the block.prevHash == cache.hash
-			// Store all blocks starting with 'block'
-			for i := len(rpcBlocks) - 1; i >= 0; i-- {
-				cache.Add(int(rpcBlocks[i].Height), rpcBlocks[i])
-			}
-		}
-	}
-
-	cache.Add(height, block)
-
 	return block, nil
 }
 

frontend/service.go

@@ -27,39 +27,25 @@ type SqlStreamer struct {
 	log    *logrus.Entry
 }
 
-func NewSQLiteStreamer(client *rpcclient.Client, log *logrus.Entry) (walletrpc.CompactTxStreamerServer, error) {
-	return &SqlStreamer{common.New(100000), client, log}, nil
+func NewSQLiteStreamer(client *rpcclient.Client, cache *common.BlockCache, log *logrus.Entry) (walletrpc.CompactTxStreamerServer, error) {
+	return &SqlStreamer{cache, client, log}, nil
 }
 
 func (s *SqlStreamer) GracefulStop() error {
 	return nil
 }
 
-func (s *SqlStreamer) GetLatestBlock(ctx context.Context, placeholder *walletrpc.ChainSpec) (*walletrpc.BlockID, error) {
-	result, rpcErr := s.client.RawRequest("getinfo", make([]json.RawMessage, 0))
-
-	var err error
-	var errCode int64
+func (s *SqlStreamer) GetCache() *common.BlockCache {
+	return s.cache
+}
 
-	// For some reason, the error responses are not JSON
-	if rpcErr != nil {
-		errParts := strings.SplitN(rpcErr.Error(), ":", 2)
-		errCode, err = strconv.ParseInt(errParts[0], 10, 32)
-		//Check to see if we are requesting a height the zcashd doesn't have yet
-		if err == nil && errCode == -8 {
-			return nil, errors.New("Don't have the requested block")
-		}
-		return nil, err
-	}
+func (s *SqlStreamer) GetLatestBlock(ctx context.Context, placeholder *walletrpc.ChainSpec) (*walletrpc.BlockID, error) {
+	latestBlock := s.cache.GetLatestBlock()
 
-	var f interface{}
-	err = json.Unmarshal(result, &f)
-	if err != nil {
-		return nil, err
+	if latestBlock == -1 {
+		return nil, errors.New("Cache is empty. Server is probably not yet ready.")
 	}
 
-	latestBlock := f.(map[string]interface{})["blocks"].(float64)
-
 	// TODO: also return block hashes here
 	return &walletrpc.BlockID{Height: uint64(latestBlock)}, nil
 }
@@ -243,7 +229,7 @@ func (s *SqlStreamer) GetTransaction(ctx context.Context, txf *walletrpc.TxFilte
 
 // GetLightdInfo gets the LightWalletD (this server) info
 func (s *SqlStreamer) GetLightdInfo(ctx context.Context, in *walletrpc.Empty) (*walletrpc.LightdInfo, error) {
-	saplingHeight, chainName, consensusBranchId, err := common.GetSaplingInfo(s.client)
+	saplingHeight, blockHeight, chainName, consensusBranchId, err := common.GetSaplingInfo(s.client)
 
 	if err != nil {
 		s.log.WithFields(logrus.Fields{
@@ -261,6 +247,7 @@ func (s *SqlStreamer) GetLightdInfo(ctx context.Context, in *walletrpc.Empty) (*
 		ChainName:               chainName,
 		SaplingActivationHeight: uint64(saplingHeight),
 		ConsensusBranchId:       consensusBranchId,
+		BlockHeight:             uint64(blockHeight),
 	}, nil
 }
 

walletrpc/service.pb.go

@@ -346,6 +346,7 @@ type LightdInfo struct {
 	ChainName               string   `protobuf:"bytes,4,opt,name=chainName,proto3" json:"chainName,omitempty"`
 	SaplingActivationHeight uint64   `protobuf:"varint,5,opt,name=saplingActivationHeight,proto3" json:"saplingActivationHeight,omitempty"`
 	ConsensusBranchId       string   `protobuf:"bytes,6,opt,name=consensusBranchId,proto3" json:"consensusBranchId,omitempty"`
+	BlockHeight             uint64   `protobuf:"varint,7,opt,name=blockHeight,proto3" json:"blockHeight,omitempty"`
 	XXX_NoUnkeyedLiteral    struct{} `json:"-"`
 	XXX_unrecognized        []byte   `json:"-"`
 	XXX_sizecache           int32    `json:"-"`
@@ -418,6 +419,13 @@ func (m *LightdInfo) GetConsensusBranchId() string {
 	return ""
 }
 
+func (m *LightdInfo) GetBlockHeight() uint64 {
+	if m != nil {
+		return m.BlockHeight
+	}
+	return 0
+}
+
 type TransparentAddress struct {
 	Address              string   `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
@@ -520,47 +528,48 @@ func init() {
 func init() { proto.RegisterFile("service.proto", fileDescriptor_a0b84a42fa06f626) }
 
 var fileDescriptor_a0b84a42fa06f626 = []byte{
-	// 630 bytes of a gzipped FileDescriptorProto
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.

walletrpc/service.proto

@@ -51,6 +51,7 @@ message LightdInfo {
     string chainName = 4;
     uint64 saplingActivationHeight = 5;
     string consensusBranchId = 6;   // This should really be u32 or []byte, but string for readability
+    uint64 blockHeight = 7;
 }
 
 message TransparentAddress {