聊聊spring boot的WebFluxTagsProvider

序

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

代码语言：javascript复制

@FunctionalInterface
public 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

代码语言：javascript复制

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

代码语言：javascript复制

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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