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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.routing.nginx;
import com.yahoo.vespa.hosted.routing.RoutingTable;
import com.yahoo.vespa.hosted.routing.RoutingTable.Real;
import com.yahoo.vespa.hosted.routing.status.RoutingStatus;
import java.util.HashMap;
import java.util.Map;
/**
* Converts a {@link RoutingTable} to Nginx's own config format.
*
* @author mpolden
*/
class NginxConfig {
private NginxConfig() {
}
public static String from(RoutingTable routingTable, RoutingStatus routingStatus) {
StringBuilder sb = new StringBuilder();
// Map SNI header to upstream
sb.append("map $ssl_preread_server_name $name {\n");
routingTable.asMap().forEach((endpoint, target) -> {
sb.append(" ").append(endpoint.dnsName()).append(" ").append(target.id()).append(";\n");
});
// Forward requests without SNI header directly to Nginx (e.g. VIP health checks)
sb.append(" '' default;\n");
sb.append("}\n\n");
// Render routing table targets as upstreams
renderUpstreamsTo(sb, routingTable, routingStatus);
// Configure the default upstream, which targets Nginx itself
sb.append("upstream default {\n");
sb.append(" server localhost:4445;\n");
sb.append(" ").append(checkDirective(4080)).append("\n");
sb.append(" ").append(checkHttpSendDirective("localhost")).append("\n");
sb.append("}\n\n");
// Listener port
sb.append("server {\n");
sb.append(" listen 443 reuseport;\n");
sb.append(" listen [::]:443 reuseport;\n");
sb.append(" proxy_pass $name;\n");
sb.append(" ssl_preread on;\n");
sb.append(" proxy_protocol on;\n");
sb.append("}\n");
return sb.toString();
}
private static String checkDirective(int port) {
// nginx_http_upstream_check_module does not support health checks over https
// a different http port is used instead, which acts as a http->https proxy for /status.html requests
return String.format("check interval=2000 fall=5 rise=2 timeout=3000 default_down=true type=http port=%d;",
port);
}
private static String checkHttpSendDirective(String upstreamName) {
return "check_http_send \"" +
"GET /status.html HTTP/1.0\\r\\n" +
"Host: " + upstreamName + "\\r\\n" +
"\\r\\n\";";
}
private static void renderUpstreamsTo(StringBuilder sb, RoutingTable routingTable, RoutingStatus routingStatus) {
Map<Real, RoutingTable.Target> realTable = new HashMap<>();
for (var target : routingTable.asMap().values()) {
if (target.applicationLevel()) continue;
for (var real : target.reals()) {
realTable.put(real, target);
}
}
routingTable.asMap().values().stream().sorted().distinct().forEach(target -> {
sb.append("upstream ").append(target.id()).append(" {").append("\n");
// Check if any target is active.
for (var real : target.reals()) {
boolean explicitRoutingActive = true;
// Check external status service if this is an application-level target
if (target.applicationLevel()) {
RoutingTable.Target targetOfReal = realTable.get(real);
explicitRoutingActive = routingStatus.isActive(targetOfReal.id());
}
String serverParameter = serverParameter(target, real, explicitRoutingActive);
sb.append(" server ").append(real.hostname()).append(":4443").append(serverParameter).append(";\n");
}
int healthCheckPort = 4082;
sb.append(" ").append(checkDirective(healthCheckPort)).append("\n");
sb.append(" ").append(checkHttpSendDirective(target.id())).append("\n");
sb.append(" random two;\n");
sb.append("}\n\n");
});
}
private static String serverParameter(RoutingTable.Target target, Real real, boolean routingActive) {
// For each real consider:
// * if not an application-level target -> no parameters
// * if active & routingActive = false AND the upstream contains at least one active host -> "down"
// * if weight assigned = 0 -> "backup"
// * if weight assigned > 0 -> "weight=<weight>"
if (!target.applicationLevel()) return "";
if (!(real.active() && routingActive) && target.active()) return " down";
int weight = real.weight();
if (weight == 0) {
return " backup";
} else {
return " weight=" + weight;
}
}
}
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