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Some corrections and performance improvements in CorrelationIdFilter #183

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merged 2 commits into from
Jul 9, 2024
Merged

Some corrections and performance improvements in CorrelationIdFilter #183

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d300062
Directly extract correlation-id from traceparent without creating a s…
j-denner Jul 5, 2024
b0bcb88
Restore silent logging of correlationHeader
j-denner Jul 5, 2024
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29 changes: 15 additions & 14 deletions ...port-servlet/src/main/java/com/sap/hcp/cf/logging/servlet/filter/CorrelationIdFilter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,10 +2,8 @@

import static com.sap.hcp.cf.logging.common.customfields.CustomField.customField;
import static com.sap.hcp.cf.logging.common.request.HttpHeaders.W3C_TRACEPARENT;
import static java.util.Optional.ofNullable;

import java.util.UUID;
import java.util.function.Predicate;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
Expand All @@ -27,8 +25,8 @@
public class CorrelationIdFilter extends AbstractLoggingFilter {

private static final Logger LOG = LoggerFactory.getLogger(CorrelationIdFilter.class);
private HttpHeader correlationHeader;
private HttpHeader traceparentHeader;
private final HttpHeader correlationHeader;
private final HttpHeader traceparentHeader;

public CorrelationIdFilter() {
this(HttpHeaders.CORRELATION_ID);
Expand Down Expand Up @@ -65,23 +63,26 @@ private String determineCorrelationId(HttpServletRequest request) {
return correlationId;
}

private boolean isBlankOrDefault(String value) {
private static boolean isBlankOrDefault(String value) {
return value == null || value.isEmpty() || value.equals(Defaults.UNKNOWN);
}

private String getCorrelationIdFromTraceparent(HttpServletRequest request) {
String traceparent = HttpHeaderUtilities.getHeaderValue(request, traceparentHeader);
return ofNullable(traceparent).filter(not(this::isBlankOrDefault)).map(this::parseTraceparent).orElse(
null);
return isBlankOrDefault(traceparent) ? null : parseTraceparent(traceparent);
}

private <T> Predicate<T> not(Predicate<T> p) {
return p.negate();
}

private String parseTraceparent(String value) {
String[] tokens = value.split("-");
return tokens.length >= 2 ? tokens[1] : null;
private static String parseTraceparent(String value) {
int idx1 = value.indexOf('-');
if (idx1 != -1) {
++idx1;
int idx2 = value.indexOf('-', idx1);
if (idx2 != -1) {
// return string between first and second '-'.
return value.substring(idx1, idx2);
}
}
return null;
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}

private void addCorrelationIdHeader(HttpServletResponse response, String correlationId) {
Expand Down