15: Add getOpenPositions() to Jupiter Perps API (real implementation)

src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsPositionServiceImpl.tjava

@@ -4,8 +4,10 @@ import com.r35157.libs.jupiter.perps.JupiterPerpsPosition;
 import com.r35157.libs.jupiter.perps.JupiterPerpsPositionService;
 import com.r35157.libs.solana.SolanaAccountInfo;
 import com.r35157.libs.solana.SolanaBlockChain;
+import com.r35157.libs.solana.SolanaProgramAccountMemcmpFilter;
 
 import java.io.IOException;
+import java.util.HashSet;
 import java.util.Set;
 
 public class AnchorIdlJupiterPerpsPositionServiceImpl implements JupiterPerpsPositionService {
@@ -37,16 +39,31 @@ public class AnchorIdlJupiterPerpsPositionServiceImpl implements JupiterPerpsPos
     }
 
     @Override
-    public Set<JupiterPerpsPosition> getOpenPositions(
-            ΩSolanaWalletIdΩ owner
-    ) throws IOException, InterruptedException {
-        throw new UnsupportedOperationException(
-                "Finding Jupiter Perps positions by owner is not implemented yet."
+    public Set<JupiterPerpsPosition> getOpenPositions(ΩSolanaWalletIdΩ owner)
+            throws IOException, InterruptedException {
+    Set<SolanaAccountInfo> accountInfos = solanaBlockChain.getProgramAccounts(
+            JUPITER_PERPS_PROGRAM_ID,
+            Set.of(new SolanaProgramAccountMemcmpFilter(
+                    POSITION_OWNER_OFFSET,
+                    owner
+            ))
         );
+
+    Set<JupiterPerpsPosition> positions = new HashSet<>();
+
+    for (SolanaAccountInfo accountInfo : accountInfos) {
+        JupiterPerpsPosition position = positionDecoder.decode(
+                accountInfo.address(),
+                accountInfo
+        );
+        positions.add(position);
     }
 
+    return Set.copyOf(positions);
+}
     private static final ΩJupiterPerpsProgramIdΩ JUPITER_PERPS_PROGRAM_ID =
             "PERPHjGBqRHArX4DySjwM6UJHiR3sWAatqfdBS2qQJu";
+    private static final int POSITION_OWNER_OFFSET = 8;
 
     private final SolanaBlockChain solanaBlockChain;
     private final AnchorIdlJupiterPerpsPositionDecoder positionDecoder;