From a17a1f9208f858601f6660dbd7f1b77dd9a3f3d9 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Fri, 12 Dec 2014 22:23:42 +0100
Subject: Implemented watching using filter package

* Added filters / watches
* Removed event dep
---
 whisper/whisper.go | 66 ++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 59 insertions(+), 7 deletions(-)

(limited to 'whisper/whisper.go')

diff --git a/whisper/whisper.go b/whisper/whisper.go
index 4d7a2a23e..356debd1c 100644
--- a/whisper/whisper.go
+++ b/whisper/whisper.go
@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/event/filter"
 	"github.com/ethereum/go-ethereum/p2p"
 	"gopkg.in/fatih/set.v0"
 )
@@ -38,28 +39,38 @@ const (
 	envelopesMsg = 0x01
 )
 
+type MessageEvent struct {
+	To      *ecdsa.PrivateKey
+	From    *ecdsa.PublicKey
+	Message *Message
+}
+
 const DefaultTtl = 50 * time.Second
 
 type Whisper struct {
-	key      *ecdsa.PrivateKey
 	protocol p2p.Protocol
+	filters  *filter.Filters
 
 	mmu      sync.RWMutex
 	messages map[Hash]*Envelope
 	expiry   map[uint32]*set.SetNonTS
 
 	quit chan struct{}
+
+	keys []*ecdsa.PrivateKey
 }
 
-func New(sec []byte) *Whisper {
+func New() *Whisper {
 	whisper := &Whisper{
-		key:      crypto.ToECDSA(sec),
 		messages: make(map[Hash]*Envelope),
+		filters:  filter.New(),
 		expiry:   make(map[uint32]*set.SetNonTS),
 		quit:     make(chan struct{}),
 	}
+	whisper.filters.Start()
 	go whisper.update()
 
+	// XXX TODO REMOVE TESTING CODE
 	msg := NewMessage([]byte(fmt.Sprintf("Hello world. This is whisper-go. Incase you're wondering; the time is %v", time.Now())))
 	envelope, _ := msg.Seal(DefaultPow, Opts{
 		Ttl: DefaultTtl,
@@ -67,6 +78,7 @@ func New(sec []byte) *Whisper {
 	if err := whisper.Send(envelope); err != nil {
 		fmt.Println(err)
 	}
+	// XXX TODO REMOVE TESTING CODE
 
 	// p2p whisper sub protocol handler
 	whisper.protocol = p2p.Protocol{
@@ -87,6 +99,35 @@ func (self *Whisper) Send(envelope *Envelope) error {
 	return self.add(envelope)
 }
 
+func (self *Whisper) NewIdentity() *ecdsa.PrivateKey {
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		panic(err)
+	}
+	self.keys = append(self.keys, key)
+
+	return key
+}
+
+func (self *Whisper) HasIdentity(key *ecdsa.PrivateKey) bool {
+	for _, key := range self.keys {
+		if key.D.Cmp(key.D) == 0 {
+			return true
+		}
+	}
+	return false
+}
+
+func (self *Whisper) Watch(opts Filter) int {
+	return self.filters.Install(filter.Generic{
+		Str1: string(crypto.FromECDSA(opts.To)),
+		Str2: string(crypto.FromECDSAPub(opts.From)),
+		Fn: func(data interface{}) {
+			opts.Fn(data.(*Message))
+		},
+	})
+}
+
 // Main handler for passing whisper messages to whisper peer objects
 func (self *Whisper) msgHandler(peer *p2p.Peer, ws p2p.MsgReadWriter) error {
 	wpeer := NewPeer(self, peer, ws)
@@ -122,7 +163,7 @@ func (self *Whisper) msgHandler(peer *p2p.Peer, ws p2p.MsgReadWriter) error {
 // takes care of adding envelopes to the messages pool. At this moment no sanity checks are being performed.
 func (self *Whisper) add(envelope *Envelope) error {
 	if !envelope.valid() {
-		return errors.New("invalid pow for envelope")
+		return errors.New("invalid pow provided for envelope")
 	}
 
 	self.mmu.Lock()
@@ -136,11 +177,9 @@ func (self *Whisper) add(envelope *Envelope) error {
 
 	if !self.expiry[envelope.Expiry].Has(hash) {
 		self.expiry[envelope.Expiry].Add(hash)
-		// TODO notify listeners (given that we had any ...)
+		self.postEvent(envelope)
 	}
 
-	fmt.Println("add", envelope)
-
 	return nil
 }
 
@@ -189,6 +228,19 @@ func (self *Whisper) envelopes() (envelopes []*Envelope) {
 	return
 }
 
+func (self *Whisper) postEvent(envelope *Envelope) {
+	for _, key := range self.keys {
+		if message, err := envelope.Open(key); err == nil {
+			// Create a custom filter?
+			self.filters.Notify(filter.Generic{
+				Str1: string(crypto.FromECDSA(key)), Str2: string(crypto.FromECDSAPub(message.Recover())),
+			}, message)
+		} else {
+			fmt.Println(err)
+		}
+	}
+}
+
 func (self *Whisper) Protocol() p2p.Protocol {
 	return self.protocol
 }
-- 
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