From 92d6393a34dac4b3d623a5169e2b50a9518b4976 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Wed, 16 May 2018 07:25:22 +0200
Subject: Add functions to send/receive custom messages

---
 src/Database.cpp | 50 +++++++++++++++++++++++++++++++++++++++++++++++---
 src/DhtKey.cpp   |  9 +++++++--
 2 files changed, 54 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/Database.cpp b/src/Database.cpp
index 241d9a5..5b3f705 100644
--- a/src/Database.cpp
+++ b/src/Database.cpp
@@ -215,7 +215,7 @@ namespace odhtdb
         Log::debug("Seeding key: %s", nodeToSeed.getRequestHash()->toString().c_str());
         DhtKey dhtKey(*nodeToSeed.getRequestHash());
         
-        auto newDataListenerFuture = node.listen(dhtKey.getNewDataListenerKey(), [this, nodeToSeed](const shared_ptr<Value> &value)
+        auto newDataListenerFuture = node.listen(dhtKey.getNewDataListenerKey(), [this, nodeToSeed](const shared_ptr<Value> value)
         {
             Log::debug("Seed: New data listener received data...");
             const Hash requestHash(value->data.data(), value->data.size());
@@ -233,7 +233,7 @@ namespace odhtdb
         newSeedInfo.reponseKeyInfoHash = responseKeyShared;
         
         // TODO: If this response key is spammed, generate a new one.
-        auto responseKeyFuture = node.listen(*responseKeyShared, [this, nodeToSeed](const shared_ptr<Value> &value)
+        auto responseKeyFuture = node.listen(*responseKeyShared, [this, nodeToSeed](const shared_ptr<Value> value)
         {
             const Hash requestHash(value->data.data(), value->data.size());
             if(requestHash == *nodeToSeed.getRequestHash())
@@ -245,7 +245,7 @@ namespace odhtdb
         
         // TODO:!!! Before listening on this key, we should check how many remote peers are also providing this data.
         // This is to prevent too many peers from responding to a request to get old data.
-        auto requestOldDataListenerFuture = node.listen(dhtKey.getRequestOldDataKey(), [this, nodeToSeed, responseKeyShared](const shared_ptr<Value> &value)
+        auto requestOldDataListenerFuture = node.listen(dhtKey.getRequestOldDataKey(), [this, nodeToSeed, responseKeyShared](const shared_ptr<Value> value)
         {
             Log::debug("Request: Got request to send old data");
             try
@@ -670,4 +670,48 @@ namespace odhtdb
     {
         return databaseStorage.getUserGroups(nodeHash, userPublicKey);
     }
+    
+    void Database::receiveCustomMessage(const dht::InfoHash &receiveMessageKey, ReceiveCustomMessageCallbackFunc callbackFunc)
+    {
+        dht::InfoHash responseKey = receiveMessageKey;
+        ++responseKey[0];
+        
+        node.listen(receiveMessageKey, [callbackFunc, this, responseKey](const shared_ptr<Value> value)
+        {
+            sibs::SafeSerializer serializer = callbackFunc(value->data.data(), value->data.size());
+            if(!serializer.getBuffer().empty())
+            {
+                Value responseValue(move(serializer.getBuffer()));
+                node.put(responseKey, move(responseValue), [](bool ok)
+                {
+                    if(!ok)
+                        Log::error("Failed to respond to custom message");
+                });
+            }
+            return true;
+        });
+    }
+    
+    void Database::sendCustomMessage(const dht::InfoHash &requestKey, vector<u8> &&data, SendCustomMessageCallbackFunc callbackFunc)
+    {
+        dht::InfoHash responseKey = requestKey;
+        ++responseKey[0];
+        
+        node.listen(responseKey, [callbackFunc](const shared_ptr<Value> value)
+        {
+            return callbackFunc(true, value->data.data(), value->data.size());
+        });
+        
+        Value value(move(data));
+        node.put(requestKey, move(value), [](bool ok)
+        {
+            if(!ok)
+                Log::error("Failed to send custom message");
+        });
+    }
+    
+    dht::InfoHash Database::getInfoHash(const void *data, usize size)
+    {
+        return dht::InfoHash((const u8*)data, size);
+    }
 }
diff --git a/src/DhtKey.cpp b/src/DhtKey.cpp
index 7bd6acf..422b715 100644
--- a/src/DhtKey.cpp
+++ b/src/DhtKey.cpp
@@ -8,13 +8,18 @@ namespace odhtdb
         firstByteOriginalValue = infoHash[0];
     }
     
-    const dht::InfoHash& DhtKey::getNewDataListenerKey()
+    DhtKey::DhtKey(const dht::InfoHash &_infoHash) : infoHash(_infoHash)
+    {
+        firstByteOriginalValue = infoHash[0];
+    }
+    
+    dht::InfoHash DhtKey::getNewDataListenerKey()
     {
         infoHash[0] = firstByteOriginalValue;
         return infoHash;
     }
     
-    const dht::InfoHash& DhtKey::getRequestOldDataKey()
+    dht::InfoHash DhtKey::getRequestOldDataKey()
     {
         infoHash[0] = firstByteOriginalValue + 1;
         return infoHash;
-- 
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