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本文主要研究一下webflux的WebFluxTagsProvider

WebFluxTagsProvider

spring-boot-actuator-2.1.5.RELEASE-sources.jar!/org/springframework/boot/actuate/metrics/web/reactive/server/WebFluxTagsProvider.java

@FunctionalInterfacepublic interface WebFluxTagsProvider { /** * Provides tags to be associated with metrics for the given {@code exchange}. * @param exchange the exchange * @param ex the current exception (may be {@code null}) * @return tags to associate with metrics for the request and response exchange */ Iterable<Tag> httpRequestTags(ServerWebExchange exchange, Throwable ex);}

WebFluxTagsProvider接口定义了httpRequestTags方法

DefaultWebFluxTagsProvider

spring-boot-actuator-2.1.5.RELEASE-sources.jar!/org/springframework/boot/actuate/metrics/web/reactive/server/DefaultWebFluxTagsProvider.java

public class DefaultWebFluxTagsProvider implements WebFluxTagsProvider { @Override public Iterable<Tag> httpRequestTags(ServerWebExchange exchange, Throwable exception) { return Arrays.asList(WebFluxTags.method(exchange), WebFluxTags.uri(exchange), WebFluxTags.exception(exception), WebFluxTags.status(exchange), WebFluxTags.outcome(exchange)); }}

DefaultWebFluxTagsProvider实现了WebFluxTagsProvider接口，它返回了method、uri、exception、status、outcome这几个tag

WebFluxTags

spring-boot-actuator-2.1.5.RELEASE-sources.jar!/org/springframework/boot/actuate/metrics/web/reactive/server/WebFluxTags.java

public final class WebFluxTags { private static final Tag URI_NOT_FOUND = Tag.of("uri", "NOT_FOUND"); private static final Tag URI_REDIRECTION = Tag.of("uri", "REDIRECTION"); private static final Tag URI_ROOT = Tag.of("uri", "root"); private static final Tag URI_UNKNOWN = Tag.of("uri", "UNKNOWN"); private static final Tag EXCEPTION_NONE = Tag.of("exception", "None"); private static final Tag OUTCOME_UNKNOWN = Tag.of("outcome", "UNKNOWN"); private static final Tag OUTCOME_INFORMATIONAL = Tag.of("outcome", "INFORMATIONAL"); private static final Tag OUTCOME_SUCCESS = Tag.of("outcome", "SUCCESS"); private static final Tag OUTCOME_REDIRECTION = Tag.of("outcome", "REDIRECTION"); private static final Tag OUTCOME_CLIENT_ERROR = Tag.of("outcome", "CLIENT_ERROR"); private static final Tag OUTCOME_SERVER_ERROR = Tag.of("outcome", "SERVER_ERROR"); private WebFluxTags() { } public static Tag method(ServerWebExchange exchange) { return Tag.of("method", exchange.getRequest().getMethodValue()); } public static Tag status(ServerWebExchange exchange) { HttpStatus status = exchange.getResponse().getStatusCode(); if (status == null) { status = HttpStatus.OK; } return Tag.of("status", String.valueOf(status.value())); } public static Tag uri(ServerWebExchange exchange) { PathPattern pathPattern = exchange .getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE); if (pathPattern != null) { return Tag.of("uri", pathPattern.getPatternString()); } HttpStatus status = exchange.getResponse().getStatusCode(); if (status != null) { if (status.is3xxRedirection()) { return URI_REDIRECTION; } if (status == HttpStatus.NOT_FOUND) { return URI_NOT_FOUND; } } String path = getPathInfo(exchange); if (path.isEmpty()) { return URI_ROOT; } return URI_UNKNOWN; } private static String getPathInfo(ServerWebExchange exchange) { String path = exchange.getRequest().getPath().value(); String uri = StringUtils.hasText(path) ? path : "/"; return uri.replaceAll("//+", "/").replaceAll("/$", ""); } public static Tag exception(Throwable exception) { if (exception != null) { String simpleName = exception.getClass().getSimpleName(); return Tag.of("exception", StringUtils.hasText(simpleName) ? simpleName : exception.getClass().getName()); } return EXCEPTION_NONE; } public static Tag outcome(ServerWebExchange exchange) { HttpStatus status = exchange.getResponse().getStatusCode(); if (status != null) { if (status.is1xxInformational()) { return OUTCOME_INFORMATIONAL; } if (status.is2xxSuccessful()) { return OUTCOME_SUCCESS; } if (status.is3xxRedirection()) { return OUTCOME_REDIRECTION; } if (status.is4xxClientError()) { return OUTCOME_CLIENT_ERROR; } return OUTCOME_SERVER_ERROR; } return OUTCOME_UNKNOWN; }}

WebFluxTags定义了URI_NOT_FOUND、URI_REDIRECTION、URI_ROOT、URI_UNKNOWN、EXCEPTION_NONE、OUTCOME_UNKNOWN、OUTCOME_INFORMATIONAL、OUTCOME_SUCCESS、OUTCOME_REDIRECTION、OUTCOME_CLIENT_ERROR、OUTCOME_SERVER_ERROR这些Tag常量

小结

WebFluxTagsProvider接口定义了httpRequestTags方法；DefaultWebFluxTagsProvider实现了WebFluxTagsProvider接口，它返回了method、uri、exception、status、outcome这几个tag；WebFluxTags定义了URI_NOT_FOUND、URI_REDIRECTION、URI_ROOT、URI_UNKNOWN、EXCEPTION_NONE、OUTCOME_UNKNOWN、OUTCOME_INFORMATIONAL、OUTCOME_SUCCESS、OUTCOME_REDIRECTION、OUTCOME_CLIENT_ERROR、OUTCOME_SERVER_ERROR这些Tag常量

doc

WebFluxTagsProvider

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