add support for udp-based delete and anonymous (relay-provided) regIDs

xwords4/relay/dbmgr.cpp

@@ -43,6 +43,7 @@
 static DBMgr* s_instance = NULL;
 
 #define DELIM "\1"
+#define MAX_NUM_PLAYERS 4
 
 static void formatParams( char* paramValues[], int nParams, const char* fmt, 
                           char* buf, int bufLen, ... );
@@ -149,6 +150,54 @@ DBMgr::FindGame( const char* connName, char* cookieBuf, int bufLen,
     return cid;
 } /* FindGame */
 
+bool
+DBMgr::FindPlayer( DevIDRelay relayID, AddrInfo::ClientToken token, 
+                   string& connName, HostID* hidp, unsigned short* seed )
+{
+    int nSuccesses = 0;
+
+    const char* fmt = 
+        "SELECT connName FROM %s WHERE %d = ANY(devids) AND %d = ANY(tokens)";
+    string query;
+    string_printf( query, fmt, GAMES_TABLE, relayID, token );
+
+    PGresult* result = PQexec( getThreadConn(), query.c_str() );
+    int nTuples = PQntuples( result );
+    vector<string> names(nTuples);
+    for ( int ii = 0; ii < nTuples; ++ii ) {
+        string name( PQgetvalue( result, ii, 0 ) );
+        names.push_back( name );
+    }
+    PQclear( result );
+
+    for ( vector<string>::const_iterator iter = names.begin();
+          iter != names.end(); ++iter ) {
+        const char* name = iter->c_str();
+        for ( HostID hid = 1; hid <= MAX_NUM_PLAYERS; ++hid ) {
+            fmt = "SELECT seeds[%d] FROM %s WHERE connname = '%s' "
+                "AND devids[%d] = %d AND tokens[%d] = %d";
+            string query;
+            string_printf( query, fmt, hid, GAMES_TABLE, name,
+                           hid, relayID, hid, token );
+            result = PQexec( getThreadConn(), query.c_str() );
+            int nTuples2 = PQntuples( result );
+            for ( int jj = 0; jj < nTuples2; ++jj ) {
+                connName = name;
+                *hidp = hid;
+                *seed = atoi( PQgetvalue( result, 0, 0 ) );
+                ++nSuccesses;
+            }
+            PQclear( result );
+        }
+    }
+
+    if ( 1 < nSuccesses ) {
+        logf( XW_LOGERROR, "%s found %d matches!!!", __func__, nSuccesses );
+    }
+
+    return nSuccesses >= 1;
+} // FindPlayer
+
 bool
 DBMgr::SeenSeed( const char* cookie, unsigned short seed,
                  int langCode, int nPlayersT, bool wantsPublic, 
@@ -295,7 +344,8 @@ DBMgr::RegisterDevice( const DevID* host )
                                              NULL, NULL, 0 );
             success = PGRES_COMMAND_OK == PQresultStatus(result);
             if ( !success ) {
-                logf( XW_LOGERROR, "PQexec=>%s;%s", PQresStatus(PQresultStatus(result)), 
+                logf( XW_LOGERROR, "PQexec=>%s;%s", 
+                      PQresStatus(PQresultStatus(result)), 
                       PQresultErrorMessage(result) );
             }
             PQclear( result );
@@ -315,7 +365,8 @@ DBMgr::updateDevice( DevIDRelay relayID, bool check )
     }
 
     if ( exists ) {
-        const char* fmt = "UPDATE " DEVICES_TABLE " SET mtime='now' WHERE id = %d";
+        const char* fmt = 
+            "UPDATE " DEVICES_TABLE " SET mtime='now' WHERE id = %d";
         string query;
         string_printf( query, fmt, relayID );
         execSql( query );

xwords4/relay/dbmgr.h

@@ -47,6 +47,9 @@ class DBMgr {
     void AddNew( const char* cookie, const char* connName, CookieID cid, 
                  int langCode, int nPlayersT, bool isPublic );
 
+    bool FindPlayer( DevIDRelay relayID, AddrInfo::ClientToken, 
+                     string& connName, HostID* hid, unsigned short* seed );
+
     CookieID FindGame( const char* connName, char* cookieBuf, int bufLen,
                        int* langP, int* nPlayersTP, int* nPlayersHP,
                        bool* isDead );

xwords4/relay/xwrelay.cpp

@@ -271,6 +271,24 @@ getNetString( const unsigned char** bufpp, const unsigned char* end, string& out
     return success;
 }
 
+static bool
+getRelayDevID( const unsigned char** bufpp, const unsigned char* end, 
+               DevID& devID )
+{
+    bool success = false;
+    unsigned short idLen;
+    if ( getNetShort( bufpp, end, &idLen ) ) {
+        if ( end - *bufpp < idLen/* && ID_TYPE_ANON != typ*/ ) {
+            logf( XW_LOGERROR, "full devID not received" );
+        } else {
+            devID.m_devIDString.append( (const char*)*bufpp, idLen );
+            *bufpp += idLen;
+            success = true;
+        }
+    }
+    return success;
+}
+
 static bool
 getHeader( const unsigned char** bufpp, const unsigned char* end,
            UDPHeader* header )
@@ -1284,6 +1302,7 @@ msgToStr( XWRelayReg msg )
     CASE_STR(XWPDEV_BADREG);
     CASE_STR(XWPDEV_ALERT);     // should not receive this....
     CASE_STR(XWPDEV_ACK);
+    CASE_STR(XWPDEV_DELGAME);
     default:
         str = "<unknown>";
         break;
@@ -1318,20 +1337,12 @@ udp_thread_proc( UdpThreadClosure* utc )
         switch( header.cmd ) {
         case XWPDEV_REG: {
             DevIDType typ = (DevIDType)*ptr++;
-            unsigned short idLen;
-            if ( !getNetShort( &ptr, end, &idLen ) ) {
-                break;
-            }
-            if ( end - ptr > idLen ) {
-                logf( XW_LOGERROR, "full devID not received" );
-                break;
-            }
             DevID devID( typ );
-            devID.m_devIDString.append( (const char*)ptr, idLen );
-            ptr += idLen;
-            registerDevice( &devID, utc->saddr() );
-        }
+            if ( getRelayDevID( &ptr, end, devID ) ) {
+                registerDevice( &devID, utc->saddr() );
+            }
             break;
+        }
         case XWPDEV_MSG: {
             AddrInfo::ClientToken clientToken;
             memcpy( &clientToken, ptr, sizeof(clientToken) );
@@ -1393,14 +1404,30 @@ udp_thread_proc( UdpThreadClosure* utc )
             }
             break;
         }
+        case XWPDEV_DELGAME: {
+            DevID devID( ID_TYPE_RELAY );
+            if ( !getRelayDevID( &ptr, end, devID ) ) {
+                break;
+            }
+            AddrInfo::ClientToken clientToken;
+            if ( getNetLong( &ptr, end, &clientToken ) && 0 != clientToken ) {
+                unsigned short seed;
+                HostID hid;
+                string connName;
+                if ( DBMgr::Get()->FindPlayer( devID.asRelayID(), clientToken, 
+                                               connName, &hid, &seed ) ) {
+                    SafeCref scr( connName.c_str() );
+                    scr.DeviceGone( hid, seed );
+                }
+            }
+            break;
+        }
         default:
             logf( XW_LOGERROR, "%s: unexpected msg %d", __func__, header.cmd );
         }
     }
 }
 
-// This will need to be done in a thread before there can be simulaneous
-// connections.
 static void
 handle_udp_packet( int udpsock )
 {

xwords4/relay/xwrelay.h

@@ -27,7 +27,12 @@
 /* Set if device is acting a server; cleared if as client */
 #define FLAGS_SERVER_BIT 0x01
 
-/* message types for the udp-based per-device (not per-game) protocol */
+/* message types for the udp-based per-device (not per-game) protocol 
+ *
+ * A number of these rely on a "clientToken", which is a 32-bit value the
+ * client provides and that it guarantees uniquely identifies a game on the
+ * device.  A database rowid works great as long as they aren't reused.
+ */
 #define XWPDEV_PROTO_VERSION 0
 #ifndef CANT_DO_TYPEDEF
 typedef
@@ -86,6 +91,9 @@ enum { XWPDEV_NONE             /* 0 is an illegal value */
                                    msgID: 4
                                 */
 
+       ,XWPDEV_DELGAME          /* dev->relay: game's been deleted.  format:
+                                   header, relayid: 4, clientToken: 4 */
+
 }
 #ifndef CANT_DO_TYPEDEF
  XWRelayReg
@@ -176,6 +184,7 @@ typedef enum {
     ,ID_TYPE_LINUX
     ,ID_TYPE_ANDROID_GCM
     ,ID_TYPE_ANDROID_OTHER
+    ,ID_TYPE_ANON               /* please assign me one based on nothing */
 
     ,ID_TYPE_NTYPES
 } DevIDType;