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Support fractional replenishRate in RedisRateLimiter #4046

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Support fractional replenishRate in RedisRateLimiter #4046

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376e364
Support fractional replenishRate in RedisRateLimiter
abhijeet4725 Jan 25, 2026
cd3e256
Fix fractionalReplenishRate test using assertConfigOnly
abhijeet4725 Jan 25, 2026
d736046
Fix formatting of X-RateLimit-Replenish-Rate header
abhijeet4725 Jan 26, 2026
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15 changes: 8 additions & 7 deletions ...ux/src/main/java/org/springframework/cloud/gateway/filter/ratelimit/RedisRateLimiter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;

import jakarta.validation.constraints.DecimalMin;
import jakarta.validation.constraints.Min;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
Expand Down Expand Up @@ -139,7 +140,7 @@ public RedisRateLimiter(ReactiveStringRedisTemplate redisTemplate, RedisScript<L
* @param defaultBurstCapacity how many tokens the bucket can hold in token-bucket
* algorithm.
*/
public RedisRateLimiter(int defaultReplenishRate, long defaultBurstCapacity) {
public RedisRateLimiter(double defaultReplenishRate, long defaultBurstCapacity) {
super(Config.class, CONFIGURATION_PROPERTY_NAME, (ConfigurationService) null);
this.defaultConfig = new Config().setReplenishRate(defaultReplenishRate).setBurstCapacity(defaultBurstCapacity);
}
Expand All @@ -151,7 +152,7 @@ public RedisRateLimiter(int defaultReplenishRate, long defaultBurstCapacity) {
* algorithm.
* @param defaultRequestedTokens how many tokens are requested per request.
*/
public RedisRateLimiter(int defaultReplenishRate, long defaultBurstCapacity, int defaultRequestedTokens) {
public RedisRateLimiter(double defaultReplenishRate, long defaultBurstCapacity, int defaultRequestedTokens) {
this(defaultReplenishRate, defaultBurstCapacity);
Objects.requireNonNull(this.defaultConfig, "defaultConfig may not be null");
this.defaultConfig.setRequestedTokens(defaultRequestedTokens);
Expand Down Expand Up @@ -250,7 +251,7 @@ public Mono<Response> isAllowed(String routeId, String id) {
Config routeConfig = loadConfiguration(routeId);

// How many requests per second do you want a user to be allowed to do?
int replenishRate = routeConfig.getReplenishRate();
double replenishRate = routeConfig.getReplenishRate();

// How much bursting do you want to allow?
long burstCapacity = routeConfig.getBurstCapacity();
Expand Down Expand Up @@ -325,20 +326,20 @@ public Map<String, String> getHeaders(Config config, Long tokensLeft) {
@Validated
public static class Config {

@Min(1)
private int replenishRate;
@DecimalMin(value = "0.0", inclusive = false)
private double replenishRate;

@Min(0)
private long burstCapacity = 1;

@Min(1)
private int requestedTokens = 1;

public int getReplenishRate() {
public double getReplenishRate() {
return replenishRate;
}

public Config setReplenishRate(int replenishRate) {
public Config setReplenishRate(double replenishRate) {
this.replenishRate = replenishRate;
return this;
}
Expand Down
15 changes: 14 additions & 1 deletion .../java/org/springframework/cloud/gateway/filter/ratelimit/RedisRateLimiterConfigTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,20 @@ public void redisRateConfiguredFromJavaAPIDirectBean() {
assertFilter("alt_custom_redis_rate_limiter", 30, 60, 20, true);
}

private void assertFilter(String key, int replenishRate, int burstCapacity, int requestedTokens,
@Test
public void fractionalReplenishRateTest() {
String key = "fractionalKey";
double replenishRate = 0.5; // half token per second
int burstCapacity = 1;
assertFilter(key, replenishRate, burstCapacity, 1, true);
assertFilter(key, replenishRate, burstCapacity, 1, false);
assertFilter(key, replenishRate, burstCapacity, 1, false); // still denied
assertFilter(key, replenishRate, burstCapacity, 1, true); // allowed after enough
// "internal time"

}

private void assertFilter(String key, double replenishRate, int burstCapacity, int requestedTokens,
boolean useDefaultConfig) {
RedisRateLimiter.Config config;

Expand Down
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