updating stream defauls like aysnc calls, wait timeout, max idle connection and keep alive counts to ensure the stream doesn't fail. Moving everything to a config file to easy updates

src/main/java/stream/DataStreamJob.java

@@ -27,12 +27,14 @@ import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
 import org.apache.flink.streaming.api.functions.co.RichCoFlatMapFunction;
 import org.apache.flink.util.ParameterTool;
 import org.apache.flink.util.Collector;
+import stream.config.StreamingDefaults;
 import stream.dto.*;
 import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
 import stream.io.PoolTokenIdElaborator;
 import stream.io.TokenElaborator;
 import stream.io.SwapElaborator;
 import stream.io.BlockTimestampElaborator;
+import stream.ohlc.OHLCPipeline;
 import stream.source.eventlog.EventLogSourceFactory;
 
 import java.util.HashMap;
@@ -72,6 +74,11 @@ public class DataStreamJob {
         final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
         env.getConfig().setGlobalJobParameters(parameters);
         URI webSocketUri = new URI(parameters.get("ws_url", "ws://localhost:8546"));
+        
+        // Async operation parameters
+        int asyncCapacity = parameters.getInt("async.capacity", StreamingDefaults.ASYNC_CAPACITY);
+        int asyncTimeoutSeconds = parameters.getInt("async.timeout.seconds", StreamingDefaults.ASYNC_TIMEOUT_SECONDS);
+        log.info("Async configuration - Capacity: {}, Timeout: {}s", asyncCapacity, asyncTimeoutSeconds);
 
         // Create ObjectMapper for pretty JSON printing
         ObjectMapper mapper = new ObjectMapper();
@@ -84,15 +91,17 @@ public class DataStreamJob {
         SingleOutputStreamOperator<SwapWithTimestamp> swapWithTimestampStream = AsyncDataStream.unorderedWait(
                 swapStream,
                 new BlockTimestampElaborator(),
-                30,
+                asyncTimeoutSeconds,
-                TimeUnit.SECONDS
+                TimeUnit.SECONDS,
+                asyncCapacity
         );
 
         SingleOutputStreamOperator<SwapEventWithTokenIds> elaboratedSwapStream = AsyncDataStream.unorderedWait(
                 swapWithTimestampStream,
                 new PoolTokenIdElaborator(),
-                30,
+                asyncTimeoutSeconds,
-                TimeUnit.SECONDS
+                TimeUnit.SECONDS,
+                asyncCapacity
         );
 
         // Extract token addresses and elaborate with metadata
@@ -109,8 +118,9 @@ public class DataStreamJob {
         SingleOutputStreamOperator<Token> elaboratedTokens = AsyncDataStream.unorderedWait(
                 tokenAddresses,
                 new TokenElaborator(),
-                120,
+                asyncTimeoutSeconds,
-                TimeUnit.SECONDS
+                TimeUnit.SECONDS,
+                asyncCapacity
         );
 
         // Connect swap events with token metadata to create SwapEventWithTokenMetadata
@@ -168,6 +178,33 @@ public class DataStreamJob {
         DataStream<Swap> swaps = swapsWithTokens
                 .map(new SwapElaborator());
 
+        // Test OHLC with USDC/WETH pool
+        OHLCPipeline ohlcPipeline = new OHLCPipeline();
+        DataStream<OHLCCandle> allOhlc = ohlcPipeline.createOHLCStream(swaps);
+
+        // Filter and print OHLC candles for USDC/WETH pool only
+        allOhlc
+            .filter(candle -> {
+                // Filter for specific USDC/WETH pool
+                String poolAddress = candle.getPool().toLowerCase();
+                String targetPool = "0x6f38e884725a116c9c7fbf208e79fe8828a2595f".toLowerCase();
+                return poolAddress.equals(targetPool);
+            })
+            .map(candle -> {
+                System.out.println("USDC/WETH OHLC: Pool=" + candle.getPool() + 
+                                  " Window=" + candle.getWindowStart() + "-" + candle.getWindowEnd() +
+                                  " Trades=" + candle.getTradeCount() +
+                                  " Open=" + candle.getOpen() +
+                                  " High=" + candle.getHigh() + 
+                                  " Low=" + candle.getLow() +
+                                  " Close=" + candle.getClose() +
+                                  " Volume=" + candle.getVolume());
+                return candle;
+            })
+            .setParallelism(1)
+            .returns(OHLCCandle.class)
+            .print("USDC-WETH-OHLC");
+
         // Print the final enriched swap objects
         swaps
                 .map(swap -> {

src/main/java/stream/dto/OHLCCandle.java

@@ -0,0 +1,56 @@
+package stream.dto;
+
+import java.math.BigDecimal;
+
+public class OHLCCandle {
+    private final String pool;
+    private final String token0;
+    private final String token1;
+    private final long windowStart;
+    private final long windowEnd;
+    private final BigDecimal open;
+    private final BigDecimal high;
+    private final BigDecimal low;
+    private final BigDecimal close;
+    private final BigDecimal volume;
+    private final int tradeCount;
+
+    public OHLCCandle(String pool, String token0, String token1,
+                      long windowStart, long windowEnd, 
+                      BigDecimal open, BigDecimal high, BigDecimal low, BigDecimal close,
+                      BigDecimal volume, int tradeCount) {
+        this.pool = pool;
+        this.token0 = token0;
+        this.token1 = token1;
+        this.windowStart = windowStart;
+        this.windowEnd = windowEnd;
+        this.open = open;
+        this.high = high;
+        this.low = low;
+        this.close = close;
+        this.volume = volume;
+        this.tradeCount = tradeCount;
+    }
+
+    // Getters
+    public String getPool() { return pool; }
+    public String getToken0() { return token0; }
+    public String getToken1() { return token1; }
+    public long getWindowStart() { return windowStart; }
+    public long getWindowEnd() { return windowEnd; }
+    public BigDecimal getOpen() { return open; }
+    public BigDecimal getHigh() { return high; }
+    public BigDecimal getLow() { return low; }
+    public BigDecimal getClose() { return close; }
+    public BigDecimal getVolume() { return volume; }
+    public int getTradeCount() { return tradeCount; }
+    
+    @Override
+    public String toString() {
+        return String.format("OHLC[%s] %s/%s %d-%d: O=%.4f H=%.4f L=%.4f C=%.4f V=%.4f Trades=%d",
+            pool.substring(0, 8) + "...", 
+            token0.substring(0, 6), token1.substring(0, 6),
+            windowStart, windowEnd,
+            open, high, low, close, volume, tradeCount);
+    }
+}

src/main/java/stream/io/BlockElaborator.java

@@ -16,11 +16,14 @@ import java.util.Collections;
 import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
+import java.util.concurrent.atomic.AtomicInteger;
 
 
 public class BlockElaborator extends RichAsyncFunction<BlockId, EthBlock> {
     private static final Logger log = LoggerFactory.getLogger(BlockElaborator.class);
     private transient Web3j w3;
+    private static final AtomicInteger activeOperations = new AtomicInteger(0);
+    private static final AtomicInteger totalOperations = new AtomicInteger(0);
 
     @Override
     public void open(OpenContext openContext) throws Exception {
@@ -30,6 +33,13 @@ public class BlockElaborator extends RichAsyncFunction<BlockId, EthBlock> {
 
     @Override
     public void asyncInvoke(BlockId blockId, final ResultFuture<EthBlock> resultFuture) {
+        int active = activeOperations.incrementAndGet();
+        int total = totalOperations.incrementAndGet();
+        
+        if (total % 100 == 0) {
+            log.info("BlockElaborator - Total operations: {}, Active operations: {}", total, active);
+        }
+        
         CompletableFuture.supplyAsync(() -> {
             try {
                 return getBlock(blockId);
@@ -37,7 +47,14 @@ public class BlockElaborator extends RichAsyncFunction<BlockId, EthBlock> {
                 log.error("Failed to get block {} on chain {}", blockId, e);
                 throw new RuntimeException("Error processing block " + blockId, e);
             }
-        }).thenAccept(result -> resultFuture.complete(Collections.singleton(result)));
+        }).thenAccept(result -> {
+            activeOperations.decrementAndGet();
+            resultFuture.complete(Collections.singleton(result));
+        }).exceptionally(throwable -> {
+            activeOperations.decrementAndGet();
+            resultFuture.completeExceptionally(throwable);
+            return null;
+        });
     }
 
     private EthBlock getBlock(BlockId id) {

src/main/java/stream/io/SwapElaborator.java

@@ -45,10 +45,9 @@ public class SwapElaborator extends RichMapFunction<SwapEventWithTokenMetadata,
             BigDecimal decimalAdjustment = new BigDecimal(10).pow(-decimalDiff);
             adjustedPrice = price.divide(decimalAdjustment, MATH_CONTEXT);
         }
-        
+
         // Determine which token is in and which is out based on amount signs
         boolean isToken0In = swapLog.amount0.compareTo(BigInteger.ZERO) < 0;
-        
         String takerAsset;
         String makerAsset;
         BigDecimal amountIn;
@@ -59,7 +58,6 @@ public class SwapElaborator extends RichMapFunction<SwapEventWithTokenMetadata,
             // User is sending token0, receiving token1
             takerAsset = event.getToken0Address();
             makerAsset = event.getToken1Address();
-            
             // Convert amounts to human-readable format using decimals
             amountIn = new BigDecimal(swapLog.amount0.abs())
                 .divide(new BigDecimal(10).pow(token0.decimals), MATH_CONTEXT);
@@ -79,15 +77,12 @@ public class SwapElaborator extends RichMapFunction<SwapEventWithTokenMetadata,
             amountOut = new BigDecimal(swapLog.amount0)
                 .divide(new BigDecimal(10).pow(token0.decimals), MATH_CONTEXT);
                 
-            // Price is how much token0 you get per token1 (inverse of adjustedPrice)
+            // We need to calculate price as token1/token0 to be consistent with token0 as quote currency
-            finalPrice = BigDecimal.ONE.divide(adjustedPrice, MATH_CONTEXT);
+            // Currently adjustedPrice = token1/token0, so we keep it as is
+            // This ensures price always represents how many token0 (quote) per 1 token1 (base)
+            // For example, in WETH/USDC: price = 2000 means 1 WETH costs 2000 USDC
+            finalPrice = adjustedPrice;
         }
-        
-        log.info("Enriched swap - Pool: {} {} -> {} Amount: {} -> {} Price: {}", 
-                pool, token0.symbol + "/" + token1.symbol,
-                isToken0In ? token1.symbol : token0.symbol,
-                amountIn, amountOut, finalPrice);
-        
         // Pass both amountIn and amountOut to constructor with unit price
         return new Swap(42161, time, exchange, pool, takerAsset, makerAsset, amountIn, amountOut, finalPrice);
     }

src/main/java/stream/io/Web3Client.java

@@ -6,6 +6,7 @@ import org.web3j.protocol.Web3j;
 import org.web3j.protocol.http.HttpService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import stream.config.StreamingDefaults;
 
 import java.time.Duration;
 import java.util.Arrays;
@@ -25,15 +26,19 @@ public class Web3Client {
             synchronized (w3Lock) {
                 log.info("Initializing Web3 client");
                 String url = params.getOrDefault("rpc_url", "http://localhost:8545");
-                int maxIdleConnections = Integer.parseInt(params.getOrDefault("max_idle_connections", "5"));
+                int maxIdleConnections = Integer.parseInt(params.getOrDefault("max_idle_connections", String.valueOf(StreamingDefaults.MAX_IDLE_CONNECTIONS)));
-                int keepAlive = Integer.parseInt(params.getOrDefault("keep_alive", "60"));
+                int keepAlive = Integer.parseInt(params.getOrDefault("keep_alive", String.valueOf(StreamingDefaults.KEEP_ALIVE_MINUTES)));
                 Duration timeout = Duration.ofSeconds(30);
-                log.debug("Web3 connection parameters - URL: {}, Max idle connections: {}, Keep alive: {} minutes, Timeout: {} seconds",
+                
+                ConnectionPool connectionPool = new ConnectionPool(maxIdleConnections, keepAlive, TimeUnit.MINUTES);
+                
+                log.info("Web3 connection parameters - URL: {}, Max idle connections: {}, Keep alive: {} minutes, Timeout: {} seconds",
                         url, maxIdleConnections, keepAlive, timeout.getSeconds());
+                
                 var httpClient = new OkHttpClient.Builder()
                         .connectionSpecs(Arrays.asList(MODERN_TLS, CLEARTEXT))
                         .connectTimeout(timeout).callTimeout(timeout).readTimeout(timeout).writeTimeout(timeout)
-                        .connectionPool(new ConnectionPool(maxIdleConnections, keepAlive, TimeUnit.MINUTES))
+                        .connectionPool(connectionPool)
                         .build();
                 w3 = Web3j.build(new HttpService(url, httpClient));
                 log.info("Web3 client initialized successfully");

src/main/java/stream/ohlc/OHLCAccumulator.java

@@ -0,0 +1,41 @@
+package stream.ohlc;
+
+import java.math.BigDecimal;
+
+public class OHLCAccumulator {
+    public String pool = null;
+    public String token0 = null;  // Added
+    public String token1 = null;  // Added
+    public BigDecimal open = null;
+    public BigDecimal high = null;
+    public BigDecimal low = null;
+    public BigDecimal close = null;
+    public BigDecimal volume = BigDecimal.ZERO;
+    public int tradeCount = 0;
+    public long firstTradeTime = 0;
+    public long lastTradeTime = 0;
+
+    public OHLCAccumulator() {}
+
+    public void updatePrice(BigDecimal price, long timestamp) {
+        if (open == null) {
+            open = price;
+            high = price;
+            low = price;
+            firstTradeTime = timestamp;
+        } else {
+            high = high.max(price);
+            low = low.min(price);
+        }
+        close = price;
+        lastTradeTime = timestamp;
+    }
+
+    public void addVolume(BigDecimal amount) {
+        volume = volume.add(amount);
+    }
+
+    public void incrementTradeCount() {
+        tradeCount++;
+    }
+}

src/main/java/stream/ohlc/OHLCAggregator.java

@@ -0,0 +1,98 @@
+package stream.ohlc;
+
+import org.apache.flink.api.common.functions.AggregateFunction;
+import stream.dto.Swap;
+import stream.dto.OHLCCandle;
+import java.math.BigDecimal;
+
+public class OHLCAggregator implements AggregateFunction<Swap, OHLCAccumulator, OHLCCandle> {
+
+    private final long windowSize = 60; // 1 minute in seconds
+
+    @Override
+    public OHLCAccumulator createAccumulator() {
+        return new OHLCAccumulator();
+    }
+
+    @Override
+    public OHLCAccumulator add(Swap swap, OHLCAccumulator accumulator) {
+        // Initialize pool and tokens on first swap
+        if (accumulator.pool == null) {
+            accumulator.pool = swap.getPool();
+            // Store tokens in consistent order (you could sort by address)
+            accumulator.token0 = swap.getTakerAsset();
+            accumulator.token1 = swap.getMakerAsset();
+        }
+        
+        // Update OHLC prices
+        accumulator.updatePrice(swap.getPrice(), swap.getTime());
+
+        // Calculate volume (using the taker's input amount as volume)
+        BigDecimal volume = swap.getAmountIn().abs();
+        accumulator.addVolume(volume);
+
+        // Increment trade count
+        accumulator.incrementTradeCount();
+
+        return accumulator;
+    }
+
+    @Override
+    public OHLCAccumulator merge(OHLCAccumulator acc1, OHLCAccumulator acc2) {
+        OHLCAccumulator merged = new OHLCAccumulator();
+
+        // Merge pool and token info
+        merged.pool = acc1.pool != null ? acc1.pool : acc2.pool;
+        merged.token0 = acc1.token0 != null ? acc1.token0 : acc2.token0;
+        merged.token1 = acc1.token1 != null ? acc1.token1 : acc2.token1;
+
+        // Merge OHLC data
+        if (acc1.open != null && acc2.open != null) {
+            merged.open = acc1.firstTradeTime <= acc2.firstTradeTime ? acc1.open : acc2.open;
+            merged.close = acc1.lastTradeTime >= acc2.lastTradeTime ? acc1.close : acc2.close;
+            merged.high = acc1.high.max(acc2.high);
+            merged.low = acc1.low.min(acc2.low);
+            merged.firstTradeTime = Math.min(acc1.firstTradeTime, acc2.firstTradeTime);
+            merged.lastTradeTime = Math.max(acc1.lastTradeTime, acc2.lastTradeTime);
+        } else if (acc1.open != null) {
+            merged.open = acc1.open;
+            merged.close = acc1.close;
+            merged.high = acc1.high;
+            merged.low = acc1.low;
+            merged.firstTradeTime = acc1.firstTradeTime;
+            merged.lastTradeTime = acc1.lastTradeTime;
+        } else if (acc2.open != null) {
+            merged.open = acc2.open;
+            merged.close = acc2.close;
+            merged.high = acc2.high;
+            merged.low = acc2.low;
+            merged.firstTradeTime = acc2.firstTradeTime;
+            merged.lastTradeTime = acc2.lastTradeTime;
+        }
+
+        merged.volume = acc1.volume.add(acc2.volume);
+        merged.tradeCount = acc1.tradeCount + acc2.tradeCount;
+
+        return merged;
+    }
+
+    @Override
+    public OHLCCandle getResult(OHLCAccumulator accumulator) {
+        long windowStart = (accumulator.firstTradeTime / windowSize) * windowSize;
+        long windowEnd = windowStart + windowSize;
+
+        return new OHLCCandle(
+            accumulator.pool,
+            accumulator.token0,
+            accumulator.token1,
+            windowStart,
+            windowEnd,
+            accumulator.open,
+            accumulator.high,
+            accumulator.low,
+            accumulator.close,
+            accumulator.volume,
+            accumulator.tradeCount
+        );
+    }
+}

src/main/java/stream/ohlc/OHLCPipeline.java

@@ -0,0 +1,26 @@
+package stream.ohlc;
+
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.windowing.assigners.TumblingProcessingTimeWindows;
+import java.time.Duration;
+import stream.dto.Swap;
+import stream.dto.OHLCCandle;
+
+public class OHLCPipeline {
+
+    public DataStream<OHLCCandle> createOHLCStream(DataStream<Swap> swapStream) {
+
+        return swapStream
+                // NO watermarks needed for processing-time windows
+                .keyBy(Swap::getPool)
+
+                // Use 1-minute processing-time windows
+                .window(TumblingProcessingTimeWindows.of(Duration.ofMinutes(1)))
+
+                // Simply use the aggregator
+                .aggregate(new OHLCAggregator())
+
+                // Filter out empty windows
+                .filter(candle -> candle.getTradeCount() > 0);
+    }
+}