15: Add getOpenPositions() to Jupiter Perps API

src/main/tjava/com/r35157/libs/jupiter/perps/JupiterPerpsPositionService.tjava

@@ -1,6 +1,7 @@
 package com.r35157.libs.jupiter.perps;
 
 import java.io.IOException;
+import java.util.Set;
 
 /**
  * Service for reading Jupiter Perps positions.
@@ -27,4 +28,18 @@ public interface JupiterPerpsPositionService {
      */
     JupiterPerpsPosition getPosition(ΩJupiterPerpsPositionAccountΩ positionAccount)
             throws IOException, InterruptedException;
+
+    /**
+     * Finds open Jupiter Perps positions owned by a wallet.
+     *
+     * <p>This method returns decoded Jupiter Perps position objects. It does not return
+     * raw Solana accounts or account ids.</p>
+     *
+     * @param owner the wallet address that owns the Jupiter Perps positions
+     * @return the open Jupiter Perps positions owned by the wallet
+     * @throws IOException if the position accounts could not be fetched or decoded
+     * @throws InterruptedException if the calling thread is interrupted while fetching positions
+     */
+    Set<JupiterPerpsPosition> getOpenPositions(ΩSolanaWalletIdΩ owner)
+            throws IOException, InterruptedException;
 }

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

@@ -4,8 +4,11 @@ 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 {
 
@@ -35,8 +38,42 @@ public class AnchorIdlJupiterPerpsPositionServiceImpl implements JupiterPerpsPos
         return pos;
     }
 
+    @Override
+    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) {
+            ΩSolanaAddressΩ address = accountInfo.address();
+            ΩSolanaProgramIdΩ programId = accountInfo.owner();
+
+            if (!JUPITER_PERPS_PROGRAM_ID.equals(programId)) {
+                String errorMsg = "Account '" + address + "' is not owned by Jupiter Perps program '" +
+                        programId + "'";
+                throw new IllegalArgumentException(errorMsg);
+            }
+
+            JupiterPerpsPosition position = positionDecoder.decode(
+                    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;