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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.maintainer;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.util.EntityUtils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.UUID;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
/**
* Finds coredumps, collects metadata and reports them
*
* @author freva
*/
class CoredumpHandler {
static final String PROCESSING_DIRECTORY_NAME = "processing";
static final String METADATA_FILE_NAME = "metadata.json";
private final Logger logger = Logger.getLogger(CoredumpHandler.class.getName());
private final ObjectMapper objectMapper = new ObjectMapper();
private final HttpClient httpClient;
private final CoreCollector coreCollector;
private final Path coredumpsPath;
private final Path doneCoredumpsPath;
private final Map<String, Object> nodeAttributes;
private final Optional<Path> installStatePath;
private final String feedEndpoint;
public CoredumpHandler(HttpClient httpClient, CoreCollector coreCollector, Path coredumpsPath, Path doneCoredumpsPath,
Map<String, Object> nodeAttributes, Optional<Path> installStatePath, String feedEndpoint) {
this.httpClient = httpClient;
this.coreCollector = coreCollector;
this.coredumpsPath = coredumpsPath;
this.doneCoredumpsPath = doneCoredumpsPath;
this.nodeAttributes = nodeAttributes;
this.installStatePath = installStatePath;
this.feedEndpoint = feedEndpoint;
}
public void processAll() throws IOException {
removeJavaCoredumps();
handleNewCoredumps();
removeOldCoredumps();
}
private void removeJavaCoredumps() throws IOException {
if (! coredumpsPath.toFile().isDirectory()) return;
FileHelper.deleteFiles(coredumpsPath, Duration.ZERO, Optional.of("^java_pid.*\\.hprof$"), false);
}
private void removeOldCoredumps() throws IOException {
if (! doneCoredumpsPath.toFile().isDirectory()) return;
FileHelper.deleteDirectories(doneCoredumpsPath, Duration.ofDays(10), Optional.empty());
}
private void handleNewCoredumps() throws IOException {
Path processingCoredumps = enqueueCoredumps();
processAndReportCoredumps(processingCoredumps);
}
/**
* Moves a coredump to a new directory under the processing/ directory. Limit to only processing
* one coredump at the time, starting with the oldest.
*/
Path enqueueCoredumps() throws IOException {
Path processingCoredumpsPath = coredumpsPath.resolve(PROCESSING_DIRECTORY_NAME);
processingCoredumpsPath.toFile().mkdirs();
if (Files.list(processingCoredumpsPath).count() > 0) return processingCoredumpsPath;
Files.list(coredumpsPath)
.filter(path -> path.toFile().isFile() && ! path.getFileName().toString().startsWith("."))
.min((Comparator.comparingLong(o -> o.toFile().lastModified())))
.ifPresent(coredumpPath -> {
try {
enqueueCoredumpForProcessing(coredumpPath, processingCoredumpsPath);
} catch (Throwable e) {
logger.log(Level.WARNING, "Failed to process coredump " + coredumpPath, e);
}
});
return processingCoredumpsPath;
}
void processAndReportCoredumps(Path processingCoredumpsPath) throws IOException {
doneCoredumpsPath.toFile().mkdirs();
Files.list(processingCoredumpsPath)
.filter(path -> path.toFile().isDirectory())
.forEach(coredumpDirectory -> {
try {
String metadata = collectMetadata(coredumpDirectory, nodeAttributes);
report(coredumpDirectory, metadata);
finishProcessing(coredumpDirectory);
} catch (Throwable e) {
logger.log(Level.WARNING, "Failed to report coredump " + coredumpDirectory, e);
}
});
}
Path enqueueCoredumpForProcessing(Path coredumpPath, Path processingCoredumpsPath) throws IOException {
// Make coredump readable
coredumpPath.toFile().setReadable(true, false);
// Create new directory for this coredump and move it into it
Path folder = processingCoredumpsPath.resolve(UUID.randomUUID().toString());
folder.toFile().mkdirs();
return Files.move(coredumpPath, folder.resolve(coredumpPath.getFileName()));
}
String collectMetadata(Path coredumpDirectory, Map<String, Object> nodeAttributes) throws IOException {
Path metadataPath = coredumpDirectory.resolve(METADATA_FILE_NAME);
if (!Files.exists(metadataPath)) {
Path coredumpPath = Files.list(coredumpDirectory).findFirst()
.orElseThrow(() -> new RuntimeException("No coredump file found in processing directory " + coredumpDirectory));
Map<String, Object> metadata = coreCollector.collect(coredumpPath, installStatePath);
metadata.putAll(nodeAttributes);
Map<String, Object> fields = new HashMap<>();
fields.put("fields", metadata);
String metadataFields = objectMapper.writeValueAsString(fields);
Files.write(metadataPath, metadataFields.getBytes());
return metadataFields;
} else {
return new String(Files.readAllBytes(metadataPath));
}
}
void report(Path coredumpDirectory, String metadata) throws IOException {
// Use core dump UUID as document ID
String documentId = coredumpDirectory.getFileName().toString();
HttpPost post = new HttpPost(feedEndpoint + "/" + documentId);
post.setHeader(HttpHeaders.CONTENT_TYPE, "application/json");
post.setEntity(new StringEntity(metadata));
HttpResponse response = httpClient.execute(post);
if (response.getStatusLine().getStatusCode() / 100 != 2) {
String result = new BufferedReader(new InputStreamReader(response.getEntity().getContent()))
.lines().collect(Collectors.joining("\n"));
throw new RuntimeException("POST to " + post.getURI() + " failed with HTTP: " +
response.getStatusLine().getStatusCode() + " [" + result + "]");
}
EntityUtils.consume(response.getEntity());
logger.info("Successfully reported coredump " + documentId);
}
void finishProcessing(Path coredumpDirectory) throws IOException {
Files.move(coredumpDirectory, doneCoredumpsPath.resolve(coredumpDirectory.getFileName()));
}
}
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