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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.jdisc;
import com.yahoo.cloud.config.DataplaneProxyConfig;
import com.yahoo.component.AbstractComponent;
import com.yahoo.jdisc.http.server.jetty.DataplaneProxyCredentials;
import javax.inject.Inject;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
/**
* Configures a data plane proxy. Currently using Nginx.
*
* @author mortent
*/
public class DataplaneProxyService extends AbstractComponent {
private static final String PREFIX = "/opt/vespa";
private static final Path CONFIG_TEMPLATE = Paths.get(PREFIX, "conf/nginx/nginx.conf.template");
private static final Path clientCertificateFile = Paths.get(PREFIX, "conf/nginx/client_cert.pem");
private static final Path clientKeyFile = Paths.get(PREFIX, "conf/nginx/client_key.pem");
private static final Path serverCertificateFile = Paths.get(PREFIX, "conf/nginx/server_cert.pem");
private static final Path serverKeyFile = Paths.get(PREFIX, "conf/nginx/server_key.pem");
private static final Path nginxConf = Paths.get(PREFIX, "conf/nginx/nginx.conf");
private boolean started;
@Inject
public DataplaneProxyService() {
this.started = false;
}
public void reconfigure(DataplaneProxyConfig config, DataplaneProxyCredentials credentialsProvider) {
try {
String serverCert = config.serverCertificate();
String serverKey = config.serverKey();
boolean configChanged = false;
configChanged |= writeFile(serverCertificateFile, serverCert);
configChanged |= writeFile(serverKeyFile, serverKey);
configChanged |= writeFile(nginxConf,
nginxConfig(
credentialsProvider.certificateFile(),
credentialsProvider.keyFile(),
serverCertificateFile,
serverKeyFile,
config.port(),
PREFIX
));
if (!started) {
startNginx();
started = true;
} else if (configChanged){
reloadNginx();
}
} catch (IOException e) {
throw new RuntimeException("Error reconfiguring data plane proxy", e);
}
}
private void startNginx() {
try {
Process startCommand = new ProcessBuilder().command(
"nginx",
"-c", nginxConf.toString()
).start();
int exitCode = startCommand.waitFor();
if (exitCode != 0) {
throw new RuntimeException("Non-zero exitcode from nginx: %d".formatted(exitCode));
}
} catch (IOException | InterruptedException e) {
throw new RuntimeException("Could not start nginx", e);
}
}
private void reloadNginx() {
try {
Process reloadCommand = new ProcessBuilder().command(
"nginx",
"-s", "reload"
).start();
int exitCode = reloadCommand.waitFor();
if (exitCode != 0) {
throw new RuntimeException("Non-zero exitcode from nginx: %d".formatted(exitCode));
}
} catch (IOException | InterruptedException e) {
throw new RuntimeException("Could not start nginx", e);
}
}
private void stopNginx() {
try {
Process stopCommand = new ProcessBuilder().command(
"nginx",
"-s", "stop"
).start();
int exitCode = stopCommand.waitFor();
if (exitCode != 0) {
throw new RuntimeException("Non-zero exitcode from nginx: %d".formatted(exitCode));
}
} catch (IOException | InterruptedException e) {
throw new RuntimeException("Could not start nginx", e);
}
}
@Override
public void deconstruct() {
super.deconstruct();
stopNginx();
}
/*
* Writes a file to disk
* return true if file was changed, false if no changes
*/
private boolean writeFile(Path file, String contents) throws IOException {
Path tempPath = Paths.get(file.toFile().getAbsolutePath() + ".new");
Files.createDirectories(tempPath.getParent());
Files.writeString(tempPath, contents);
if (!Files.exists(file) || Files.mismatch(tempPath, file) > 0) {
Files.move(tempPath, file, StandardCopyOption.REPLACE_EXISTING);
return true;
} else {
Files.delete(tempPath);
return false;
}
}
static String nginxConfig(
Path clientCert,
Path clientKey,
Path serverCert,
Path serverKey,
int vespaPort,
String prefix) {
try {
String nginxTemplate = Files.readString(CONFIG_TEMPLATE);
nginxTemplate = replace(nginxTemplate, "client_cert", clientCert.toString());
nginxTemplate = replace(nginxTemplate, "client_key", clientKey.toString());
nginxTemplate = replace(nginxTemplate, "server_cert", serverCert.toString());
nginxTemplate = replace(nginxTemplate, "server_key", serverKey.toString());
nginxTemplate = replace(nginxTemplate, "vespa_port", Integer.toString(vespaPort));
nginxTemplate = replace(nginxTemplate, "prefix", prefix);
// TODO: verify that all template vars have been expanded
return nginxTemplate;
} catch (IOException e) {
throw new IllegalArgumentException("Could not create data plane proxy configuration", e);
}
}
private static String replace(String template, String key, String value) {
return template.replaceAll("\\$\\{%s\\}".formatted(key), value);
}
}
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