Created
September 24, 2023 18:10
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RateLimiterServlet
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| <dependency> | |
| <groupId>io.github.resilience4j</groupId> | |
| <artifactId>resilience4j-all</artifactId> | |
| <version>2.1.0</version> | |
| </dependency> | |
| <dependency> | |
| <groupId>io.github.resilience4j</groupId> | |
| <artifactId>resilience4j-vavr</artifactId> | |
| <version>2.1.0</version> | |
| </dependency> |
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| import io.github.resilience4j.ratelimiter.RateLimiter; | |
| import org.springframework.context.annotation.Bean; | |
| import org.springframework.context.annotation.Configuration; | |
| import java.time.Duration; | |
| @Configuration | |
| public class RateLimiterConfig { | |
| @Bean | |
| public RateLimiter rateLimiter(){ | |
| //2 request per second | |
| io.github.resilience4j.ratelimiter.RateLimiterConfig config = io.github.resilience4j.ratelimiter.RateLimiterConfig.custom() | |
| .timeoutDuration(Duration.ofSeconds(0)) | |
| .limitRefreshPeriod(Duration.ofSeconds(1)) | |
| .limitForPeriod(2) | |
| .build(); | |
| RateLimiter rateLimiter = RateLimiter.of("backendName", config); | |
| return rateLimiter; | |
| } | |
| } |
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| import io.github.resilience4j.ratelimiter.RateLimiter; | |
| import io.github.resilience4j.ratelimiter.RequestNotPermitted; | |
| import io.vavr.control.Try; | |
| import jakarta.servlet.*; | |
| import jakarta.servlet.http.HttpServletResponse; | |
| import lombok.RequiredArgsConstructor; | |
| import lombok.SneakyThrows; | |
| import lombok.extern.slf4j.Slf4j; | |
| import org.springframework.stereotype.Component; | |
| import java.io.IOException; | |
| @RequiredArgsConstructor | |
| @Component | |
| @Slf4j | |
| public class RateLimiterServlet implements Filter { | |
| private final RateLimiter rateLimiter; | |
| @Override | |
| public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { | |
| try { | |
| Try.runRunnable(() -> RateLimiter.decorateConsumer(rateLimiter, 1, unused -> chain(servletRequest, servletResponse, filterChain)).accept(null)).get(); | |
| } catch (RequestNotPermitted rnp) { | |
| log.info("2 requests per second is allowed"); | |
| ((HttpServletResponse) servletResponse).setStatus(429); | |
| } | |
| } | |
| @SneakyThrows | |
| private void chain(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) { | |
| filterChain.doFilter(servletRequest, servletResponse); | |
| } | |
| } |
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