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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler;
import com.yahoo.component.annotation.Inject;
import com.yahoo.container.core.LogHandlerConfig;
import com.yahoo.container.jdisc.AsyncHttpResponse;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.container.jdisc.RequestView;
import com.yahoo.container.jdisc.ThreadedHttpRequestHandler;
import com.yahoo.container.jdisc.utils.CapabilityRequiringRequestHandler;
import com.yahoo.jdisc.handler.CompletionHandler;
import com.yahoo.jdisc.handler.ContentChannel;
import com.yahoo.security.tls.Capability;
import java.io.OutputStream;
import java.time.Instant;
import java.util.Optional;
import java.util.concurrent.Executor;
import java.util.logging.Level;
public class LogHandler extends ThreadedHttpRequestHandler implements CapabilityRequiringRequestHandler {
private final LogReader logReader;
private static final long MB = 1024 * 1024;
@Inject
public LogHandler(Executor executor, LogHandlerConfig config) {
this(executor, new LogReader(config.logDirectory(), config.logPattern()));
}
LogHandler(Executor executor, LogReader logReader) {
super(executor);
this.logReader = logReader;
}
@Override public Capability requiredCapability(RequestView __) { return Capability.LOGSERVER_API; }
@Override
public AsyncHttpResponse handle(HttpRequest request) {
Instant from = Optional.ofNullable(request.getProperty("from"))
.map(Long::valueOf).map(Instant::ofEpochMilli).orElse(Instant.MIN);
Instant to = Optional.ofNullable(request.getProperty("to"))
.map(Long::valueOf).map(Instant::ofEpochMilli).orElse(Instant.MAX);
long maxLines = Optional.ofNullable(request.getProperty("maxLines"))
.map(Long::valueOf).orElse(100_000L);
Optional<String> hostname = Optional.ofNullable(request.getProperty("hostname"));
return new AsyncHttpResponse(200) {
@Override
public long maxPendingBytes() { return MB; }
@Override
public void render(OutputStream output, ContentChannel networkChannel, CompletionHandler handler) {
try (output) {
logReader.writeLogs(output, from, to, maxLines, hostname);
}
catch (Throwable t) {
log.log(Level.WARNING, "Failed reading logs from " + from + " to " + to, t);
}
finally {
networkChannel.close(handler);
}
}
};
}
}
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