Spring Cloud Gateway源码解析实战 - 路由工厂
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1、基于日期时间的断言工厂
基于日期时间的断言工厂主要是通过日期时间对请求进行断言，判断请求时间是否符合配置的时间，实现类主要有三种，分别如下：
-
AfterRoutePredicateFactory ：接收一个日期参数判断请求时间是否在配置时间之后； -
BeforeRoutePredicateFactory ：接收一个日期参数，判断请求日期是否在指定日期之前； -
BetweenRoutePredicateFactory ：接收两个日期参数，判断请求日期是否在这两个指定日期之间；
2、AfterRoutePredicateFactory
org.springframework.cloud.gateway.handler.predicate.AfterRoutePredicateFactory，用于匹配请求时间在指定时间之后的请求，其UML关系图如下（其他实现类的UML类似）：
其源码如下：
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public class AfterRoutePredicateFactory
extends AbstractRoutePredicateFactory<AfterRoutePredicateFactory.Config> {
/**
* DateTime key.
*/
public static final String DATETIME_KEY = "datetime";
public AfterRoutePredicateFactory() {
super(Config.class);
}
@Override
public List<String> shortcutFieldOrder() {
return Collections.singletonList(DATETIME_KEY);
}
@Override
public Predicate<ServerWebExchange> apply(Config config) {
// 获取配置的时间
ZonedDateTime datetime = config.getDatetime();
return exchange -> {
// 当前请求时间
final ZonedDateTime now = ZonedDateTime.now();
// 判断当前请求时间是否在配置时间之后
return now.isAfter(datetime);
};
}
public static class Config {
@NotNull
private ZonedDateTime datetime;
public ZonedDateTime getDatetime() {
return datetime;
}
public void setDatetime(ZonedDateTime datetime) {
this.datetime = datetime;
}
}
}
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2.1 yml配置示例
application.yml
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spring:
cloud:
gateway:
routes:
- id: after_route
uri: http://example.org
predicates:
- After=2019-01-20T17:42:47.789-07:00[America/Denver]
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3、BeforeRoutePredicateFactory
org.springframework.cloud.gateway.handler.predicate.BeforeRoutePredicateFactory，用于匹配请求时间在指定时间之前的请求，其源码如下：
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public class BeforeRoutePredicateFactory
extends AbstractRoutePredicateFactory<BeforeRoutePredicateFactory.Config> {
/**
* DateTime key.
*/
public static final String DATETIME_KEY = "datetime";
public BeforeRoutePredicateFactory() {
super(Config.class);
}
@Override
public List<String> shortcutFieldOrder() {
return Collections.singletonList(DATETIME_KEY);
}
@Override
public Predicate<ServerWebExchange> apply(Config config) {
// 获取配置时间
ZonedDateTime datetime = config.getDatetime();
return exchange -> {
// 当前请求时间
final ZonedDateTime now = ZonedDateTime.now();
// 判断当前请求时间是否在配置时间之前
return now.isBefore(datetime);
};
}
public static class Config {
private ZonedDateTime datetime;
public ZonedDateTime getDatetime() {
return datetime;
}
public void setDatetime(ZonedDateTime datetime) {
this.datetime = datetime;
}
}
}
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3.1 yml配置示例
application.yml
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spring:
cloud:
gateway:
routes:
- id: before_route
uri: http://example.org
predicates:
- Before=2019-01-20T17:42:47.789-07:00[America/Denver]
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4、BetweenRoutePredicateFactory
org.springframework.cloud.gateway.handler.predicate.BetweenRoutePredicateFactory，用于匹配请求时间在指定时间之间的请求，其源码如下：
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public class BetweenRoutePredicateFactory
extends AbstractRoutePredicateFactory<BetweenRoutePredicateFactory.Config> {
/**
* DateTime 1 key. 开始时间
*/
public static final String DATETIME1_KEY = "datetime1";
/**
* DateTime 2 key. 结束时间
*/
public static final String DATETIME2_KEY = "datetime2";
public BetweenRoutePredicateFactory() {
super(Config.class);
}
@Override
public List<String> shortcutFieldOrder() {
return Arrays.asList(DATETIME1_KEY, DATETIME2_KEY);
}
@Override
public Predicate<ServerWebExchange> apply(Config config) {
// 获取配置的开始时间
ZonedDateTime datetime1 = config.datetime1;
// 获取配置的结束时间
ZonedDateTime datetime2 = config.datetime2;
// 断言结束时间大于开始时间
Assert.isTrue(datetime1.isBefore(datetime2),
config.datetime1 + " must be before " + config.datetime2);
return exchange -> {
// 当前请求时间
final ZonedDateTime now = ZonedDateTime.now();
// 判断当前请求时间大于开始时间，并且小于结束时间
return now.isAfter(datetime1) && now.isBefore(datetime2);
};
}
@Validated
public static class Config {
@NotNull
private ZonedDateTime datetime1;
@NotNull
private ZonedDateTime datetime2;
public ZonedDateTime getDatetime1() {
return datetime1;
}
public Config setDatetime1(ZonedDateTime datetime1) {
this.datetime1 = datetime1;
return this;
}
public ZonedDateTime getDatetime2() {
return datetime2;
}
public Config setDatetime2(ZonedDateTime datetime2) {
this.datetime2 = datetime2;
return this;
}
}
}
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4.1 yml配置示例
application.yml
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spring:
cloud:
gateway:
routes:
- id: between_route
uri: http://example.org
predicates:
- Between=2019-01-20T17:42:47.789-07:00[America/Denver], 2019-01-21T17:42:47.789-07:00[America/Denver]
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