#53 [feat] : OHLCV 차트 조회 API 구현 (GET)

backend/src/main/java/org/dgu/backend/controller/ChartController.java

@@ -0,0 +1,28 @@
+package org.dgu.backend.controller;
+
+import lombok.RequiredArgsConstructor;
+import org.dgu.backend.common.ApiResponse;
+import org.dgu.backend.common.constant.SuccessStatus;
+import org.dgu.backend.dto.ChartDto;
+import org.dgu.backend.service.ChartService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/v1/charts")
+@RequiredArgsConstructor
+public class ChartController {
+    private final ChartService chartService;
+
+    // OHLCV 차트를 조회하는 API
+    @GetMapping
+    public ResponseEntity<ApiResponse<List<ChartDto.OHLCVResponse>>> getOHLCVCharts(
+            @RequestParam("coin_name") String koreanName,
+            @RequestParam("candle_name") String candleName) {
+
+        List<ChartDto.OHLCVResponse> ohlcvResponses = chartService.getOHLCVCharts(koreanName, candleName);
+        return ApiResponse.onSuccess(SuccessStatus.SUCCESS_GET_OHLCV_CHART, ohlcvResponses);
+    }
+}

backend/src/main/java/org/dgu/backend/service/ChartService.java

@@ -0,0 +1,9 @@
+package org.dgu.backend.service;
+
+import org.dgu.backend.dto.ChartDto;
+
+import java.util.List;
+
+public interface ChartService {
+    List<ChartDto.OHLCVResponse> getOHLCVCharts(String koreanName, String candleType);
+}

backend/src/main/java/org/dgu/backend/service/ChartServiceImpl.java

@@ -0,0 +1,60 @@
+package org.dgu.backend.service;
+
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.dgu.backend.domain.Candle;
+import org.dgu.backend.domain.CandleInfo;
+import org.dgu.backend.domain.Market;
+import org.dgu.backend.dto.ChartDto;
+import org.dgu.backend.exception.ChartErrorResult;
+import org.dgu.backend.exception.ChartException;
+import org.dgu.backend.repository.CandleInfoRepository;
+import org.dgu.backend.repository.CandleRepository;
+import org.dgu.backend.repository.MarketRepository;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+@Transactional
+@RequiredArgsConstructor
+public class ChartServiceImpl implements ChartService {
+    private final MarketRepository marketRepository;
+    private final CandleRepository candleRepository;
+    private final CandleInfoRepository candleInfoRepository;
+
+    private static final List<String> SEVEN_DAY_CANDLES = Arrays.asList("minutes1", "minutes3", "minutes5", "minutes10", "minutes15", "minutes30");
+    private static final List<String> SIX_MONTH_CANDLES = Arrays.asList("minutes60", "minutes240");
+
+    // OHLCV 차트를 반환하는 메서드
+    @Override
+    public List<ChartDto.OHLCVResponse> getOHLCVCharts(String koreanName, String candleName) {
+        Market market = marketRepository.findByKoreanName(koreanName);
+        Candle candle = candleRepository.findByCandleName(candleName);
+
+        LocalDateTime startDate = getStartDateByCandleName(candleName);
+
+        List<CandleInfo> candleInfos = candleInfoRepository.findByMarketAndCandleAndDateTimeAfter(market, candle, startDate);
+        if (candleInfos.isEmpty()) {
+            throw new ChartException(ChartErrorResult.NOT_FOUND_CHARTS);
+        }
+        return candleInfos.stream()
+                .map(ChartDto.OHLCVResponse::of)
+                .collect(Collectors.toList());
+    }
+
+    // 캔들 종류에 따라 시작 기간을 계산해 반환하는 메서드
+    private LocalDateTime getStartDateByCandleName(String candleName) {
+        LocalDateTime now = LocalDateTime.now();
+        if (SEVEN_DAY_CANDLES.contains(candleName)) {
+            return now.minusDays(7);
+        } else if (SIX_MONTH_CANDLES.contains(candleName)) {
+            return now.minusMonths(6);
+        } else {
+            return LocalDateTime.of(2019, 1, 1, 0, 0);
+        }
+    }
+}