WIP start implementing mempool stuff

cmd/server/main.go

@@ -223,6 +223,11 @@ func main() {
 	// Register service
 	walletrpc.RegisterCompactTxStreamerServer(server, service)
 
+
+    // Initialize mempool monitor
+	exitMempool := make(chan bool)
+	common.StartMempoolMonitor(cache, exitMempool)
+
 	// Start listening
 	listener, err := net.Listen("tcp", opts.bindAddr)
 	if err != nil {
@@ -237,6 +242,7 @@ func main() {
 	signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
 	go func() {
 		s := <-signals
+        exitMempool <- true
 		log.WithFields(logrus.Fields{
 			"signal": s.String(),
 		}).Info("caught signal, stopping gRPC server")

common/cache.go

@@ -18,6 +18,8 @@ type BlockCache struct {
 
 	FirstBlock int
 	LastBlock  int
+	NextBlock  int     // height of the first block not in the cache
+
 
 	m map[int]*BlockCacheEntry
 
@@ -110,6 +112,17 @@ func (c *BlockCache) Get(height int) *walletrpc.CompactBlock {
 	return serialized
 }
 
+// GetLatestHeight returns the height of the most recent block, or -1
+// if the cache is empty.
+func (c *BlockCache) GetLatestHeight() int {
+	c.mutex.RLock()
+	defer c.mutex.RUnlock()
+	if c.FirstBlock == c.NextBlock {
+		return -1
+	}
+	return c.NextBlock - 1
+}
+
 func (c *BlockCache) GetLatestBlock() int {
 	c.mutex.RLock()
 	defer c.mutex.RUnlock()

common/common.go

@@ -15,6 +15,12 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
+
+// RawRequest points to the function to send a an RPC request to zcashd;
+// in production, it points to btcsuite/btcd/rpcclient/rawrequest.go:RawRequest();
+// in unit tests it points to a function to mock RPCs to hushd
+var RawRequest func(method string, params []json.RawMessage) (json.RawMessage, error)
+
 func GetSaplingInfo(rpcClient *rpcclient.Client) (int, int, string, string, int, int, int, error) {
 	result, rpcErr := rpcClient.RawRequest("getblockchaininfo", make([]json.RawMessage, 0))
 

common/mempool.go

@@ -0,0 +1,181 @@
+package common
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"sync"
+	"sync/atomic"
+	"time"
+
+    log "github.com/sirupsen/logrus"
+
+    // Go is too dumb to import from branches so use upstream for now
+	//"github.com/zcash/lightwalletd/walletrpc"
+    "git.hush.is/hush/lightwalletd/walletrpc"
+)
+
+var (
+	// List of all mempool transactions
+	txns map[string]*walletrpc.RawTransaction = make(map[string]*walletrpc.RawTransaction)
+
+	// List of all clients waiting to recieve mempool txns
+	clients []chan<- *walletrpc.RawTransaction
+
+	// Last height of the blocks. If this changes, then close all the clients and flush the mempool
+	lastHeight int
+
+	// A pointer to the blockcache
+	blockcache *BlockCache
+
+	// Mutex to lock the above 2 structs
+	lock sync.Mutex
+
+	// Since the mutex doesn't have a "try_lock" method, we'll have to improvize with this
+	refreshing int32 = 0
+)
+
+// AddNewClient adds a new client to the list of clients to notify for mempool txns
+func AddNewClient(client chan<- *walletrpc.RawTransaction) {
+	lock.Lock()
+	defer lock.Unlock()
+
+	//Log.Infoln("Adding new client, sending ", len(txns), " transactions")
+
+	// Also send all pending mempool txns
+	for _, rtx := range txns {
+		if client != nil {
+			client <- rtx
+		}
+	}
+
+	if client != nil {
+		clients = append(clients, client)
+	}
+}
+
+// RefreshMempoolTxns gets all new mempool txns and sends any new ones to waiting clients
+func refreshMempoolTxns() error {
+	log.Infoln("Refreshing mempool")
+
+	// First check if another refresh is running, if it is, just return
+	if !atomic.CompareAndSwapInt32(&refreshing, 0, 1) {
+		log.Warnln("Another refresh in progress, returning")
+		return nil
+	}
+
+	// Set refreshing to 0 when we exit
+	defer func() {
+		refreshing = 0
+	}()
+
+	// Check if the blockchain has changed, and if it has, then clear everything
+
+	lock.Lock()
+	defer lock.Unlock()
+
+	if lastHeight < blockcache.GetLatestHeight() {
+		log.Infoln("Block height changed, clearing everything")
+
+		// Flush all the clients
+		for _, client := range clients {
+			if client != nil {
+				close(client)
+			}
+		}
+
+		clients = make([]chan<- *walletrpc.RawTransaction, 0)
+
+		// Clear txns
+		txns = make(map[string]*walletrpc.RawTransaction)
+
+		lastHeight = blockcache.GetLatestHeight()
+	}
+
+	var mempoolList []string
+	params := make([]json.RawMessage, 0)
+	result, rpcErr := RawRequest("getrawmempool", params)
+	if rpcErr != nil {
+		return rpcErr
+	}
+	err := json.Unmarshal(result, &mempoolList)
+	if err != nil {
+		return err
+	}
+
+	//println("getrawmempool size ", len(mempoolList))
+
+	// Fetch all new mempool txns and add them into `newTxns`
+	for _, txidstr := range mempoolList {
+		if _, ok := txns[txidstr]; !ok {
+			txidJSON, err := json.Marshal(txidstr)
+			if err != nil {
+				return err
+			}
+			// The "0" is because we only need the raw hex, which is returned as
+			// just a hex string, and not even a json string (with quotes).
+			params := []json.RawMessage{txidJSON, json.RawMessage("0")}
+			result, rpcErr := RawRequest("getrawtransaction", params)
+			if rpcErr != nil {
+				// Not an error; mempool transactions can disappear
+				continue
+			}
+			// strip the quotes
+			var txStr string
+			err = json.Unmarshal(result, &txStr)
+			if err != nil {
+				return err
+			}
+
+			// conver to binary
+			txBytes, err := hex.DecodeString(txStr)
+			if err != nil {
+				return err
+			}
+
+			newRtx := &walletrpc.RawTransaction{
+				Data:   txBytes,
+				Height: uint64(lastHeight),
+			}
+
+			// Notify waiting clients
+			for _, client := range clients {
+				if client != nil {
+					client <- newRtx
+				}
+			}
+
+			log.Infoln("Adding new mempool txid", txidstr, " sending to ", len(clients), " clients")
+			txns[txidstr] = newRtx
+		}
+	}
+
+	return nil
+}
+
+// StartMempoolMonitor starts monitoring the mempool
+func StartMempoolMonitor(cache *BlockCache, done <-chan bool) {
+	go func() {
+		ticker := time.NewTicker(2 * time.Second)
+		blockcache = cache
+		lastHeight = blockcache.GetLatestHeight()
+
+		for {
+			select {
+			case <-ticker.C:
+				go func() {
+					//Log.Infoln("Ticker triggered")
+					err := refreshMempoolTxns()
+					if err != nil {
+						log.Errorln("Mempool refresh error:", err.Error())
+					}
+				}()
+
+			case <-done:
+				for _, client := range clients {
+					close(client)
+				}
+				return
+			}
+		}
+	}()
+}

frontend/service.go

@@ -14,6 +14,8 @@ import (
 	"github.com/sirupsen/logrus"
 
 	"git.hush.is/hush/lightwalletd/common"
+    //"github.com/zcash/lightwalletd/walletrpc"
+    // go should be able to import branches! 
 	"git.hush.is/hush/lightwalletd/walletrpc"
 )
 
@@ -331,3 +333,154 @@ func (s *SqlStreamer) SendTransaction(ctx context.Context, rawtx *walletrpc.RawT
 		ErrorMessage: errMsg,
 	}, nil
 }
+
+
+func (s *lwdStreamer) GetMempoolStream(_empty *walletrpc.Empty, resp walletrpc.CompactTxStreamer_GetMempoolStreamServer) error {
+	ch := make(chan *walletrpc.RawTransaction, 200)
+	go common.AddNewClient(ch)
+
+	for {
+		select {
+		case rtx, more := <-ch:
+			if !more || rtx == nil {
+				return nil
+			}
+
+			if resp.Send(rtx) != nil {
+				return nil
+			}
+		// Timeout after 5 mins
+		case <-time.After(5 * time.Minute):
+			return nil
+		}
+	}
+}
+
+// Key is 32-byte txid (as a 64-character string), data is pointer to compact tx.
+var mempoolMap *map[string]*walletrpc.CompactTx
+var mempoolList []string
+
+// Last time we pulled a copy of the mempool from zcashd.
+var lastMempool time.Time
+
+func (s *lwdStreamer) GetMempoolTx(exclude *walletrpc.Exclude, resp walletrpc.CompactTxStreamer_GetMempoolTxServer) error {
+	if time.Now().Sub(lastMempool).Seconds() >= 2 {
+		lastMempool = time.Now()
+		// Refresh our copy of the mempool.
+		params := make([]json.RawMessage, 0)
+		result, rpcErr := common.RawRequest("getrawmempool", params)
+		if rpcErr != nil {
+			return rpcErr
+		}
+		err := json.Unmarshal(result, &mempoolList)
+		if err != nil {
+			return err
+		}
+		newmempoolMap := make(map[string]*walletrpc.CompactTx)
+		if mempoolMap == nil {
+			mempoolMap = &newmempoolMap
+		}
+		for _, txidstr := range mempoolList {
+			if ctx, ok := (*mempoolMap)[txidstr]; ok {
+				// This ctx has already been fetched, copy pointer to it.
+				newmempoolMap[txidstr] = ctx
+				continue
+			}
+			txidJSON, err := json.Marshal(txidstr)
+			if err != nil {
+				return err
+			}
+			// The "0" is because we only need the raw hex, which is returned as
+			// just a hex string, and not even a json string (with quotes).
+			params := []json.RawMessage{txidJSON, json.RawMessage("0")}
+			result, rpcErr := common.RawRequest("getrawtransaction", params)
+			if rpcErr != nil {
+				// Not an error; mempool transactions can disappear
+				continue
+			}
+			// strip the quotes
+			var txStr string
+			err = json.Unmarshal(result, &txStr)
+			if err != nil {
+				return err
+			}
+
+			// conver to binary
+			txBytes, err := hex.DecodeString(txStr)
+			if err != nil {
+				return err
+			}
+			tx := parser.NewTransaction()
+			txdata, err := tx.ParseFromSlice(txBytes)
+			if len(txdata) > 0 {
+				return errors.New("extra data deserializing transaction")
+			}
+			newmempoolMap[txidstr] = &walletrpc.CompactTx{}
+			if tx.HasSaplingElements() {
+				newmempoolMap[txidstr] = tx.ToCompact( /* height */ 0)
+			}
+		}
+		mempoolMap = &newmempoolMap
+	}
+	excludeHex := make([]string, len(exclude.Txid))
+	for i := 0; i < len(exclude.Txid); i++ {
+		excludeHex[i] = hex.EncodeToString(parser.Reverse(exclude.Txid[i]))
+	}
+	for _, txid := range MempoolFilter(mempoolList, excludeHex) {
+		tx := (*mempoolMap)[txid]
+		if len(tx.Hash) > 0 {
+			err := resp.Send(tx)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// Return the subset of items that aren't excluded, but
+// if more than one item matches an exclude entry, return
+// all those items.
+func MempoolFilter(items, exclude []string) []string {
+	sort.Slice(items, func(i, j int) bool {
+		return items[i] < items[j]
+	})
+	sort.Slice(exclude, func(i, j int) bool {
+		return exclude[i] < exclude[j]
+	})
+	// Determine how many items match each exclude item.
+	nmatches := make([]int, len(exclude))
+	// is the exclude string less than the item string?
+	lessthan := func(e, i string) bool {
+		l := len(e)
+		if l > len(i) {
+			l = len(i)
+		}
+		return e < i[0:l]
+	}
+	ei := 0
+	for _, item := range items {
+		for ei < len(exclude) && lessthan(exclude[ei], item) {
+			ei++
+		}
+		match := ei < len(exclude) && strings.HasPrefix(item, exclude[ei])
+		if match {
+			nmatches[ei]++
+		}
+	}
+
+	// Add each item that isn't uniquely excluded to the results.
+	tosend := make([]string, 0)
+	ei = 0
+	for _, item := range items {
+		for ei < len(exclude) && lessthan(exclude[ei], item) {
+			ei++
+		}
+		match := ei < len(exclude) && strings.HasPrefix(item, exclude[ei])
+		if !match || nmatches[ei] > 1 {
+			tosend = append(tosend, item)
+		}
+	}
+	return tosend
+}
+

go.mod

@@ -3,15 +3,10 @@ module git.hush.is/hush/lightwalletd
 go 1.12
 
 require (
-	cloud.google.com/go v0.46.3 // indirect
-	github.com/btcsuite/btcd v0.0.0-20190926002857-ba530c4abb35
+	github.com/btcsuite/btcd v0.20.1-beta
 	github.com/btcsuite/goleveldb v1.0.0 // indirect
 	github.com/creack/pty v1.1.9 // indirect
-	github.com/golang/groupcache v0.0.0-20191002201903-404acd9df4cc // indirect
-	github.com/golang/protobuf v1.3.2
-	github.com/google/go-cmp v0.3.1 // indirect
-	github.com/google/pprof v0.0.0-20190930153522-6ce02741cba3 // indirect
-	github.com/gopherjs/gopherjs v0.0.0-20190915194858-d3ddacdb130f // indirect
+	github.com/golang/protobuf v1.5.2
 	github.com/hashicorp/golang-lru v0.5.3 // indirect
 	github.com/jessevdk/go-flags v1.4.0 // indirect
 	github.com/jstemmer/go-junit-report v0.9.1 // indirect
@@ -22,29 +17,16 @@ require (
 	github.com/onsi/ginkgo v1.10.2 // indirect
 	github.com/onsi/gomega v1.7.0 // indirect
 	github.com/pebbe/zmq4 v1.0.0 // indirect
-	github.com/pkg/errors v0.8.1
+	github.com/pkg/errors v0.9.1
 	github.com/rogpeppe/go-internal v1.5.0 // indirect
 	github.com/sirupsen/logrus v1.4.2
 	github.com/smartystreets/assertions v1.0.1 // indirect
-	github.com/smartystreets/goconvey v0.0.0-20190731233626-505e41936337 // indirect
 	github.com/stretchr/objx v0.2.0 // indirect
-	github.com/stretchr/testify v1.4.0 // indirect
-	go.opencensus.io v0.22.1 // indirect
-	golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc // indirect
-	golang.org/x/exp v0.0.0-20191002040644-a1355ae1e2c3 // indirect
+	github.com/zcash/lightwalletd v0.4.12
 	golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a // indirect
-	golang.org/x/lint v0.0.0-20190930215403-16217165b5de // indirect
 	golang.org/x/mobile v0.0.0-20191002175909-6d0d39b2ca82 // indirect
-	golang.org/x/net v0.0.0-20191007182048-72f939374954
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
-	golang.org/x/sys v0.0.0-20191008105621-543471e840be // indirect
-	golang.org/x/time v0.0.0-20190921001708-c4c64cad1fd0 // indirect
-	golang.org/x/tools v0.0.0-20191007185444-6536af71d98a // indirect
-	google.golang.org/api v0.10.0 // indirect
+	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4
 	google.golang.org/appengine v1.6.5 // indirect
-	google.golang.org/genproto v0.0.0-20191007204434-a023cd5227bd // indirect
-	google.golang.org/grpc v1.24.0
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
-	gopkg.in/ini.v1 v1.48.0
-	gopkg.in/yaml.v2 v2.2.4 // indirect
+	google.golang.org/grpc v1.44.0
+	gopkg.in/ini.v1 v1.51.0
 )

go.sum

@@ -5,19 +5,43 @@ cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6A
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
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+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
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 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
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 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
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+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
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 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
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+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
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+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/btcsuite/btcd v0.0.0-20190115013929-ed77733ec07d h1:xG8Pj6Y6J760xwETNmMzmlt38QSwz0BLp1cZ09g27uw=
 github.com/btcsuite/btcd v0.0.0-20190115013929-ed77733ec07d/go.mod h1:d3C0AkH6BRcvO8T0UEPu53cnw4IbV63x1bEjildYhO0=
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@@ -33,40 +57,103 @@ github.com/btcsuite/snappy-go v1.0.0/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg
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@@ -74,33 +161,65 @@ github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e h1:JKmoR8x90Iww1
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 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
 go.opencensus.io v0.22.1/go.mod h1:Ap50jQcDJrx6rB6VgeeFPtuPIf3wMRvRfrfYDO6+BmA=
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+go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
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 golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793 h1:u+LnwYTOOW7Ukr/fppxEb1Nwz0AtPflrblfvUudpo+I=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472 h1:Gv7RPwsi3eZ2Fgewe3CBsuOebPwO27PoXzRpJPsvSSM=
 golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7 h1:0hQKqeLdqlt5iIwVOBErRisrHJAN57yOiPRQItI20fU=
@@ -158,6 +334,10 @@ golang.org/x/crypto v0.0.0-20190923035154-9ee001bba392 h1:ACG4HJsFiNMf47Y4PeRoeb
 golang.org/x/crypto v0.0.0-20190923035154-9ee001bba392/go.mod h1:/lpIB1dKB+9EgE3H3cr1v9wB50oz8l4C4h62xy7jSTY=
 golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc h1:c0o/qxkaO2LF5t6fQrT4b5hzyggAkLLlCUjqfRxd8Q4=
 golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad h1:DN0cp81fZ3njFcrLCytUHRSUkqBjfTo4Tx9RJTWs0EY=
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 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -166,6 +346,12 @@ golang.org/x/exp v0.0.0-20190829153037-c13cbed26979/go.mod h1:86+5VVa7VpoJ4kLfm0
 golang.org/x/exp v0.0.0-20190912063710-ac5d2bfcbfe0/go.mod h1:86+5VVa7VpoJ4kLfm080zCjGlMRFzhUhsZKEZO7MGek=
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@@ -177,6 +363,10 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
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@@ -185,10 +375,15 @@ golang.org/x/mobile v0.0.0-20190923204409-d3ece3b6da5f/go.mod h1:p895TfNkDgPEmEQ
 golang.org/x/mobile v0.0.0-20191002175909-6d0d39b2ca82/go.mod h1:p895TfNkDgPEmEQrNiOtIl3j98d/tGU95djDj7NfyjQ=
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@@ -197,8 +392,11 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
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@@ -209,10 +407,24 @@ golang.org/x/net v0.0.0-20190923162816-aa69164e4478 h1:l5EDrHhldLYb3ZRHDUhXF7Om7
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 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
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 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
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@@ -220,11 +432,16 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -233,6 +450,7 @@ golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -242,16 +460,44 @@ golang.org/x/sys v0.0.0-20190912141932-bc967efca4b8/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -304,10 +578,25 @@ google.golang.org/genproto v0.0.0-20190916214212-f660b8655731 h1:Phvl0+G5t5k/EUF
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 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
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 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
@@ -315,9 +604,35 @@ google.golang.org/grpc v1.23.1 h1:q4XQuHFC6I28BKZpo6IYyb3mNO+l7lSOxRuYTCiDfXk=
 google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
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 google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
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+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
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 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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 gopkg.in/ini.v1 v1.41.0 h1:Ka3ViY6gNYSKiVy71zXBEqKplnV35ImDLVG+8uoIklE=
@@ -326,16 +641,28 @@ gopkg.in/ini.v1 v1.46.0 h1:VeDZbLYGaupuvIrsYCEOe/L/2Pcs5n7hdO1ZTjporag=
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 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
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walletrpc/service.proto

@@ -90,4 +90,21 @@ service CompactTxStreamer {
     // Misc
     rpc GetLightdInfo(Empty) returns (LightdInfo) {}
     rpc GetCoinsupply(Empty) returns (Coinsupply) {}
+
+    // Mempool
+
+    // Return the compact transactions currently in the mempool; the results
+    // can be a few seconds out of date. If the Exclude list is empty, return
+    // all transactions; otherwise return all *except* those in the Exclude list
+    // (if any); this allows the client to avoid receiving transactions that it
+    // already has (from an earlier call to this rpc). The transaction IDs in the
+    // Exclude list can be shortened to any number of bytes to make the request
+    // more bandwidth-efficient; if two or more transactions in the mempool
+    // match a shortened txid, they are all sent (none is excluded). Transactions
+    // in the exclude list that don't exist in the mempool are ignored.
+    rpc GetMempoolTx(Exclude) returns (stream CompactTx) {}
+
+    // Return a stream of current Mempool transactions. This will keep the output stream open while
+    // there are mempool transactions. It will close the returned stream when a new block is mined.
+    rpc GetMempoolStream(Empty) returns (stream RawTransaction) {}
 }