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ScraperService.java
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ScraperService.java
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package io.irw.hawk.scraper.service.scrape;
import static io.irw.hawk.scraper.model.ProcessingPipelineStep.linearExecutionGraphByDependencies;
import com.ebay.buy.browse.api.ItemSummaryApi;
import com.ebay.buy.browse.model.ItemSummary;
import com.ebay.buy.browse.model.SearchPagedCollection;
import io.irw.hawk.configuration.HawkProperties;
import io.irw.hawk.dto.ebay.EbayFindingDto;
import io.irw.hawk.dto.ebay.EbayHighlightDto;
import io.irw.hawk.dto.ebay.EbaySellerDto;
import io.irw.hawk.dto.ebay.SearchTermDto;
import io.irw.hawk.dto.merchandise.HawkScrapeRunDto;
import io.irw.hawk.dto.merchandise.ProductVariantEnum;
import io.irw.hawk.integration.ebay.buy.browse.ItemSummaryApiWrapper;
import io.irw.hawk.mapper.EbayFindingMapper;
import io.irw.hawk.mapper.EbaySellerMapper;
import io.irw.hawk.scraper.exceptions.ScrapingException;
import io.irw.hawk.scraper.model.MerchandiseReasoningLog;
import io.irw.hawk.dto.merchandise.MerchandiseVerdictType;
import io.irw.hawk.scraper.model.ProcessingPipelineStep;
import io.irw.hawk.scraper.model.ProcessingPipelineMetadata;
import io.irw.hawk.scraper.service.domain.EbayFindingService;
import io.irw.hawk.scraper.service.domain.EbayHighlightService;
import io.irw.hawk.scraper.service.domain.EbaySellerService;
import io.irw.hawk.scraper.service.domain.HawkScrapeRunService;
import io.irw.hawk.scraper.service.extractors.ItemSummaryDataExtractor;
import io.irw.hawk.scraper.service.matchers.ItemSummaryMatcher;
import io.irw.hawk.scraper.service.processors.ProductScrapeProcessor;
import java.time.Instant;
import java.util.Comparator;
import java.util.List;
import java.util.Random;
import java.util.concurrent.atomic.AtomicBoolean;
import lombok.AccessLevel;
import lombok.RequiredArgsConstructor;
import lombok.experimental.FieldDefaults;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.util.Pair;
import org.springframework.stereotype.Service;
@RequiredArgsConstructor
@FieldDefaults(level = AccessLevel.PRIVATE, makeFinal = true)
@Service
@Slf4j
public class ScraperService {
ProcessingPipelineStep[] processingPipelineSteps;
ItemSummaryApiWrapper itemSummaryApi;
ItemSummaryApi itemApi;
ScrapeTargetProviderService scrapeTargetProviderService;
HawkScrapeRunService hawkScrapeRunService;
List<ProductScrapeProcessor> scrapeProcessors;
EbaySellerMapper ebaySellerMapper;
EbayFindingMapper ebayFindingMapper;
EbaySellerService ebaySellerService;
EbayFindingService ebayFindingService;
EbayHighlightService ebayHighlightService;
ScrapeRunSummaryPrintingService scrapeRunSummaryPrintingService;
HawkProperties hawkProperties;
private AtomicBoolean isScraping = new AtomicBoolean(false);
public void scrape() {
isScraping.set(true);
while (isScraping.get()) {
scrapeTargetProviderService.getNextScrapeTarget()
.ifPresentOrElse(this::scrapePV, () -> isScraping.set(false));
}
}
private void scrapePV(ProductVariantEnum targetProductVariant) {
HawkScrapeRunDto hawkScrapeRunDto = hawkScrapeRunService.startScrapeRun(targetProductVariant);
ProductScrapeProcessor productScrapeProcessor = findMatchingScrapingProcessor(targetProductVariant);
for (SearchTermDto searchTermDto : productScrapeProcessor.generateSearchTerms(targetProductVariant)) {
SearchPagedCollection result = itemSummaryApi.search(searchTermDto.getSearchParams());
if (result.getItemSummaries() == null) {
log.warn("No items found for search term: {}", searchTermDto);
continue;
}
Random random = new Random();
for (ItemSummary itemSummary : result.getItemSummaries()) {
if (!hawkProperties.getSampling().isEnabled() || random.nextDouble() < hawkProperties.getSampling().getRate()) {
processItemSummary(targetProductVariant, itemSummary, hawkScrapeRunDto);
}
}
}
scrapeRunSummaryPrintingService.printScrapeRunSummary(hawkScrapeRunDto);
}
private void processItemSummary(ProductVariantEnum targetProductVariant, ItemSummary itemSummary,
HawkScrapeRunDto hawkScrapeRunDto) {
EbaySellerDto ebaySellerDto = ebaySellerService.upsertSeller(
ebaySellerMapper.sellerToEbaySellerDto(itemSummary.getSeller()));
EbayHighlightDto highlightDto = EbayHighlightDto.builder()
.run(hawkScrapeRunDto)
.ebayFinding(getEbayFindingDto(itemSummary, ebaySellerDto))
.pipelineMetadata(new ProcessingPipelineMetadata())
.aggregatedVerdict(determineInitialVerdictBasedOnListingType(itemSummary))
.build();
for (ProcessingPipelineStep pipelineStep : linearExecutionGraphByDependencies(processingPipelineSteps)) {
if (pipelineStep instanceof ItemSummaryMatcher itemSummaryMatcher) {
applyMatcher(targetProductVariant, itemSummary, itemSummaryMatcher, highlightDto);
if (highlightDto.getAggregatedVerdict() == MerchandiseVerdictType.ITEM_ALREADY_PERSISTED) {
break;
}
} else if (pipelineStep instanceof ItemSummaryDataExtractor itemSummaryDataExtractor) {
applyDataExtractor(itemSummary, itemSummaryDataExtractor, highlightDto);
} else {
throw new IllegalStateException("Unknown pipeline step: " + pipelineStep);
}
}
EbayFindingDto persistedEbayFindingDto = saveOrUpdateEbayFinding(highlightDto.getEbayFinding());
highlightDto.setEbayFinding(persistedEbayFindingDto);
ebayHighlightService.saveHighlight(highlightDto);
}
private static MerchandiseVerdictType determineInitialVerdictBasedOnListingType(ItemSummary itemSummary) {
if (itemSummary.getBuyingOptions().contains("AUCTION")) {
return MerchandiseVerdictType.SNIPE_RECOMMENDED;
}
if(itemSummary.getBuyingOptions().contains("FIXED_PRICE")) {
return MerchandiseVerdictType.BUY_IT_NOW_RECOMMENDED;
}
throw new IllegalStateException("Unknown listing type: " + itemSummary.getBuyingOptions());
}
private EbayFindingDto saveOrUpdateEbayFinding(EbayFindingDto ebayFindingDto) {
ebayFindingDto.setCapturedAt(Instant.now());
if (ebayFindingDto.getId() == null) {
return ebayFindingService.saveFinding(ebayFindingDto);
} else {
return ebayFindingService.updateFinding(ebayFindingDto);
}
}
private EbayFindingDto getEbayFindingDto(ItemSummary itemSummary, EbaySellerDto ebaySellerDto) {
return ebayFindingService.findByEbayId(itemSummary.getItemId())
.orElseGet(() -> ebayFindingMapper.itemSummaryToEbayFindingDto(itemSummary, ebaySellerDto));
}
private static void applyDataExtractor(ItemSummary itemSummary,
ItemSummaryDataExtractor itemSummaryDataExtractor, EbayHighlightDto highlightDto) {
if (itemSummaryDataExtractor.isApplicableTo(highlightDto)) {
highlightDto.getPipelineMetadata()
.newStep(itemSummaryDataExtractor.getClass());
log.trace("Running extractor: {}", itemSummaryDataExtractor.getClass()
.getSimpleName());
itemSummaryDataExtractor.extractDataFromItem(itemSummary, highlightDto);
}
}
private static void applyMatcher(ProductVariantEnum targetProductVariant, ItemSummary itemSummary,
ItemSummaryMatcher itemSummaryMatcher, EbayHighlightDto highlightDto) {
if (itemSummaryMatcher.isApplicableTo(targetProductVariant)) {
highlightDto.getPipelineMetadata()
.newStep(itemSummaryMatcher.getClass());
log.trace("Running matcher: {}", itemSummaryMatcher.getClass().getSimpleName());
itemSummaryMatcher.match(itemSummary, highlightDto);
}
updateMerchandiseVerdict(highlightDto);
}
private ProductScrapeProcessor findMatchingScrapingProcessor(ProductVariantEnum targetProductVariant) {
List<ProductScrapeProcessor> matchingProcessors = scrapeProcessors.stream()
.filter(processor -> processor.supports(targetProductVariant))
.toList();
if (matchingProcessors.size() != 1) {
String errorMessage = String.format("Expected 1 matching processor for item %s, found %s",
targetProductVariant, matchingProcessors);
log.error(errorMessage);
throw new ScrapingException(errorMessage);
}
return matchingProcessors.get(0);
}
private static void updateMerchandiseVerdict(EbayHighlightDto highlightDto) {
highlightDto.getPipelineMetadata()
.filterReasoningsFromLog()
.stream()
.min(Comparator.comparing(merchandiseReasoningDto -> merchandiseReasoningDto.getVerdict()
.ordinal()))
.map(MerchandiseReasoningLog::getVerdict)
.ifPresent(highlightDto::setAggregatedVerdict);
}
}