/// <summary>
/// Validates the instance.
/// </summary>
/// <param name="context">The validation context.</param>
public void Validate(TrafficValidationContext context)
{
if (ConnectSeconds < 0.0)
{
context.Error($"Load balancer timeout [{nameof(ConnectSeconds)}={ConnectSeconds}] is not valid.");
}
if (ClientSeconds < 0.0)
{
context.Error($"Load balancer timeout [{nameof(ClientSeconds)}={ClientSeconds}] is not valid.");
}
if (HttpKeepAliveSeconds < 0.0)
{
context.Error($"Load balancer timeout [{nameof(HttpKeepAliveSeconds)}={HttpKeepAliveSeconds}] is not valid.");
}
if (ServerSeconds < 0.0)
{
context.Error($"Load balancer timeout [{nameof(ServerSeconds)}={ServerSeconds}] is not valid.");
}
if (CheckSeconds <= 0.0)
{
context.Error($"Load balancer timeout [{nameof(CheckSeconds)}={CheckSeconds}] is not positive.");
}
}
/// <summary>
/// Validates the instance.
/// </summary>
/// <param name="context">The validation context.</param>
public void Validate(TrafficValidationContext context)
{
if (string.IsNullOrWhiteSpace(Name))
{
context.Error($"Load balancer resolver [{nameof(Name)}] cannot be null or empty.");
}
if (NameServers == null || NameServers.Count == 0)
{
context.Error($"Load balancer resolver [{nameof(NameServers)}] at least one name server must be specified.");
}
if (ResolveRetries < 0)
{
context.Error($"Load balancer resolver [{nameof(ResolveRetries)}={ResolveRetries}] is not valid.");
}
if (RetrySeconds <= 0.0)
{
context.Error($"Load balancer resolver [{nameof(RetrySeconds)}={RetrySeconds}] is not valid.");
}
if (HoldSeconds < 0.0)
{
context.Error($"Load balancer resolver [{nameof(HoldSeconds)}={HoldSeconds}] is not valid.");
}
}
/// <summary>
/// Validates the instance.
/// </summary>
/// <param name="context">The validation context.</param>
public void Validate(TrafficValidationContext context)
{
if (string.IsNullOrWhiteSpace(Name))
{
context.Error("Load balancer nameserver name cannot be null or empty.");
}
var isValid = false;
if (!string.IsNullOrWhiteSpace(Endpoint))
{
var colonPos = Endpoint.LastIndexOf(':');
if (colonPos >= 0)
{
var addressPart = Endpoint.Substring(0, colonPos);
var portPart = Endpoint.Substring(colonPos + 1);
ushort port;
isValid = IPAddress.TryParse(addressPart, out var address) && ushort.TryParse(portPart, out port);
}
if (!isValid)
{
context.Error($"[{nameof(TrafficNameserver)}.{nameof(Name)}={Endpoint}] is not valid.");
}
}
}
/// <summary>
/// Validates the header.
/// </summary>
/// <param name="context">The validation context.</param>
/// <param name="rule">The parent rule.</param>
public void Validate(TrafficValidationContext context, TrafficRule rule)
{
if (string.IsNullOrWhiteSpace(Name))
{
context.Error($"Rule [{rule.Name}] specifies a NULL or empty [{nameof(TrafficCheckHeader)}.{nameof(TrafficCheckHeader.Name)}].");
}
foreach (var ch in Name)
{
if (char.IsLetterOrDigit(ch) || ch == '-' || ch == '_')
{
continue;
}
context.Error($"Rule [{rule.Name}] specifies a [{nameof(TrafficCheckHeader)}.{nameof(TrafficCheckHeader.Name)}] with the invalid character [{ch}].");
break;
}
if (string.IsNullOrWhiteSpace(Value))
{
context.Error($"Rule [{rule.Name}] specifies a NULL [{nameof(TrafficCheckHeader)}.{nameof(TrafficCheckHeader.Value)}].");
}
// $todo(jeff.lill):
//
// We could try to validate the [Value] property too (e.g. to ensure that it doesn't include "\r\n") but
// that could be overly restrictive if I'm not careful. I'm going to leave this be for now.
}
/// <summary>
/// Validates the instance.
/// </summary>
/// <param name="context">The validation context.</param>
public void Validate(TrafficValidationContext context)
{
Timeouts = Timeouts ?? new TrafficTimeouts();
Resolvers = Resolvers ?? new List <TrafficResolver>();
BridgeTargetAddresses = BridgeTargetAddresses ?? new List <IPAddress>();
if (!Resolvers.Exists(r => r.Name == "docker"))
{
Resolvers.Add(
new TrafficResolver()
{
Name = "docker",
NameServers = new List <TrafficNameserver>()
{
new TrafficNameserver()
{
Name = "docker0",
Endpoint = HiveConst.DockerDnsEndpoint
}
}
});
}
if (!NetHelper.IsValidPort(ProxyPorts.PortRange.FirstPort) ||
!NetHelper.IsValidPort(ProxyPorts.PortRange.LastPort) ||
ProxyPorts.PortRange.LastPort <= ProxyPorts.PortRange.FirstPort + 1)
{
context.Error($"Load balancer port block [{ProxyPorts.PortRange.FirstPort}-{ProxyPorts.PortRange.LastPort}] range is not valid.");
}
if (MaxConnections <= 0)
{
context.Error($"Load balancer settings [{nameof(MaxConnections)}={MaxConnections}] is not positive.");
}
Timeouts.Validate(context);
if (!Resolvers.Exists(r => r.Name == "docker"))
{
context.Error($"Load balancer settings [{nameof(Resolvers)}] must include a [docker] definition.");
}
foreach (var resolver in Resolvers)
{
resolver.Validate(context);
}
if (BridgeTargetCount < 0)
{
context.Error($"Load balancer settings [{nameof(BridgeTargetCount)}={BridgeTargetCount}] cannot be negative.");
}
if (BridgeTargetCount == 0 && BridgeTargetAddresses.Count == 0)
{
context.Error($"Load balancer settings no bridge targets are specified.");
}
}
/// <summary>
/// Validates the frontend.
/// </summary>
/// <param name="context">The validation context.</param>
/// <param name="rule">The parent rule.</param>
public void Validate(TrafficValidationContext context, TrafficTcpRule rule)
{
base.Validate(context, rule);
if (PublicPort > 0 && !NetHelper.IsValidPort(PublicPort))
{
context.Error($"Load balancer [{nameof(PublicPort)}={PublicPort}] is not a valid network port.");
}
if (!context.Settings.ProxyPorts.IsValidTcpPort(ProxyPort))
{
context.Error($"Rule [{rule.Name}] assigns [{nameof(ProxyPort)}={ProxyPort}] which is outside the range of valid frontend TCP ports for this traffic manager [{context.Settings.ProxyPorts}].");
}
}
/// <summary>
/// Validates the rule.
/// </summary>
/// <param name="context">The validation context.</param>
public override void Validate(TrafficValidationContext context)
{
base.Validate(context);
Frontends = Frontends ?? new List <TrafficTcpFrontend>();
Backends = Backends ?? new List <TrafficTcpBackend>();
if (Frontends.Count == 0)
{
context.Error($"Rule [{Name}] has does not define a frontend.");
}
if (Backends.Count == 0)
{
context.Error($"Rule [{Name}] has does not define a backend.");
}
foreach (var frontend in Frontends)
{
frontend.Validate(context, this);
}
foreach (var backend in Backends)
{
backend.Validate(context, this);
}
// Verify that the ports are unique for each frontend and that none of these TCP
// target one of the reserved HTTP/HTTPS proxy ports.
var frontendMap = new HashSet <int>();
foreach (var frontend in Frontends)
{
var key = frontend.ProxyPort;
if (frontendMap.Contains(key))
{
context.Error($"TCP rule [{Name}] includes two or more frontends that map to port [{key}].");
}
if (frontend.ProxyPort == HiveHostPorts.ProxyPublicHttp || frontend.ProxyPort == HiveHostPorts.ProxyPublicHttps ||
frontend.ProxyPort == HiveHostPorts.ProxyPublicHttp || frontend.ProxyPort == HiveHostPorts.ProxyPublicHttps)
{
context.Error($"Rule [{Name}] has a TCP frontend with [{nameof(frontend.ProxyPort)}={frontend.ProxyPort}] that is incorrectly mapped to a reserved HTTP/HTTPS port.");
}
frontendMap.Add(key);
}
}
/// <summary>
/// Validates the instance.
/// </summary>
/// <param name="context">The validation context.</param>
public virtual void Validate(TrafficValidationContext context)
{
Timeouts = Timeouts ?? new TrafficTimeouts();
if (string.IsNullOrEmpty(Name))
{
context.Error($"Load balancer rule name is required.");
}
if (!HiveDefinition.NameRegex.IsMatch(Name))
{
context.Error($"Load balancer rule name [{nameof(Name)}={Name}] is not valid.");
}
if (context.ValidateResolvers)
{
if (!string.IsNullOrWhiteSpace(Resolver) &&
context.Settings != null &&
context.Settings.Resolvers.Count(r => string.Equals(Resolver, r.Name, StringComparison.OrdinalIgnoreCase)) == 0)
{
context.Error($"Load balancer resolver [{nameof(Resolver)}={Resolver}] does not exist.");
}
}
Resolver = Resolver ?? defaultResolverName;
CheckHeaders = CheckHeaders ?? new List <TrafficCheckHeader>();
foreach (var checkHeader in CheckHeaders)
{
checkHeader.Validate(context, this);
}
if (UseHttpCheckMode)
{
if (string.IsNullOrEmpty(CheckUri) || !Uri.TryCreate(CheckUri, UriKind.RelativeOrAbsolute, out var uri))
{
context.Error($"Rule [{nameof(Name)}] has invalid [{nameof(CheckUri)}={CheckUri}].");
}
}
if (CheckSeconds < 0.0)
{
CheckSeconds = 5.0;
}
Timeouts.Validate(context);
}
/// <summary>
/// Validates the item.
/// </summary>
/// <param name="context">The validation context.</param>
public void Validate(TrafficValidationContext context)
{
if (string.IsNullOrEmpty(Uri))
{
context.Error($"[{nameof(TrafficWarmTarget)}.{nameof(Uri)}] cannot be NULL or empty.");
}
if (!System.Uri.TryCreate(Uri, UriKind.Absolute, out var uri))
{
context.Error($"[{nameof(TrafficWarmTarget)}.{nameof(Uri)}={Uri}] is not a valid fully qualified URI.");
}
if (UpdateSeconds <= 0)
{
UpdateSeconds = defaultUpdateSeconds;
}
}
/// <summary>
/// Validates the frontend.
/// </summary>
/// <param name="context">The validation context.</param>
/// <param name="rule">The parent rule.</param>
public void Validate(TrafficValidationContext context, TrafficRule rule)
{
// Verify [MaxConnections]
if (MaxConnections < 0)
{
context.Error($"Rule [{rule.Name}] specifies invalid [{nameof(MaxConnections)}={MaxConnections}].");
}
}
/// <summary>
/// Validates the settings.
/// </summary>
/// <param name="context">The validation context.</param>
/// <param name="rule">The parent rule.</param>
public void Validate(TrafficValidationContext context, TrafficHttpRule rule)
{
if (DnsTTL < 1)
{
context.Error($"[{nameof(TrafficHttpCache)}.{nameof(DnsTTL)}={DnsTTL}] cannot be less than 1 second.");
}
WarmTargets = WarmTargets ?? new List <TrafficWarmTarget>();
// Verify that each warm target has valid properties and that they
// all match at one of the rule frontends.
foreach (var target in WarmTargets)
{
target.Validate(context);
if (rule.GetFrontendForWarmTarget(target) == null)
{
context.Error($"Rule [{rule.Name}] includes the [{target.Uri}] cache warming target which cannot be mapped to a rule frontend.");
}
}
}
/// <summary>
/// Validates the backend.
/// </summary>
/// <param name="context">The validation context.</param>
/// <param name="ruleName">The parent rule name.</param>
public virtual void Validate(TrafficValidationContext context, string ruleName)
{
if (!string.IsNullOrEmpty(Name) && !HiveDefinition.IsValidName(Name))
{
context.Error($"Rule [{ruleName}] has backend server with invalid [{nameof(Name)}={Name}].");
}
if (!string.IsNullOrEmpty(Group))
{
if (!HiveDefinition.IsValidName(Group))
{
context.Error($"Rule [{ruleName}] has backend with [{nameof(Group)}={Group}] which is not a valid group name.");
}
if (GroupLimit < 0)
{
context.Error($"Rule [{ruleName}] has backend with [{nameof(GroupLimit)}={GroupLimit}] which may not be less than zero.");
}
}
else
{
if (string.IsNullOrEmpty(Server) ||
(!IPAddress.TryParse(Server, out var address) && !HiveDefinition.DnsHostRegex.IsMatch(Server)))
{
context.Error($"Rule [{ruleName}] has backend server [{Server}] which is not valid. A DNS name or IP address was expected.");
}
}
if (!NetHelper.IsValidPort(Port))
{
context.Error($"Rule [{ruleName}] has backend server with invalid [{nameof(Port)}={Port}] which is outside the range of valid TCP ports.");
}
if (MaxConnections < 0)
{
context.Error($"Rule [{ruleName}] has backend server with invalid [{nameof(MaxConnections)}={MaxConnections}].");
}
}
/// <summary>
/// Validates the frontend.
/// </summary>
/// <param name="context">The validation context.</param>
/// <param name="rule">The parent rule.</param>
public void Validate(TrafficValidationContext context, TrafficHttpRule rule)
{
base.Validate(context, rule);
if (rule.Frontends.Count > 1 ||
!string.IsNullOrEmpty(CertName) ||
ProxyPort == 0 ||
ProxyPort == HiveHostPorts.ProxyPublicHttp || ProxyPort == HiveHostPorts.ProxyPublicHttps ||
ProxyPort == HiveHostPorts.ProxyPrivateHttp || ProxyPort == HiveHostPorts.ProxyPrivateHttps)
{
// The hostname is required so verify it.
if (string.IsNullOrEmpty(Host))
{
context.Error($"Rule [{rule.Name}] has a frontend without a [{nameof(Host)}] specified. HTTP rules targeting the default traffic manager HTTP/S ports, with more than one frontend, or secured by TLS requires frontend hostnames.");
}
else if (!HiveDefinition.DnsHostRegex.IsMatch(Host))
{
context.Error($"Rule [{rule.Name}] defines the invalid hostname [{Host}].");
}
}
else
{
// The hostname is not required but verify it if one is specified.
if (!string.IsNullOrEmpty(Host) && !HiveDefinition.DnsHostRegex.IsMatch(Host))
{
context.Error($"Rule [{rule.Name}] defines the invalid hostname [{Host}].");
}
}
if (!string.IsNullOrEmpty(PathPrefix))
{
if (!PathPrefix.StartsWith("/"))
{
context.Error($"Rule [{rule.Name}] references has [{nameof(PathPrefix)}={PathPrefix}] that does not begin with a forward slash.");
}
else
{
if (!PathPrefix.EndsWith("/"))
{
PathPrefix += "/";
}
if (!Uri.TryCreate(PathPrefix, UriKind.Relative, out Uri uri))
{
context.Error($"Rule [{rule.Name}] references has [{nameof(PathPrefix)}={PathPrefix}] that is not a valid relative URI.");
}
}
}
if (CertName != null && context.ValidateCertificates)
{
TlsCertificate certificate;
if (!context.Certificates.TryGetValue(CertName, out certificate))
{
context.Error($"Rule [{rule.Name}] references certificate [{CertName}] that does not exist or could not be loaded.");
}
else
{
if (!certificate.IsValidHost(Host))
{
context.Error($"Rule [{rule.Name}] references certificate [{CertName}] which does not cover host [{Host}].");
}
if (!certificate.IsValidDate(DateTime.UtcNow))
{
context.Error($"Rule [{rule.Name}] references certificate [{CertName}] which expired on [{certificate.ValidUntil}].");
}
}
}
if (ProxyPort != 0)
{
if (!context.Settings.ProxyPorts.IsValidPort(ProxyPort))
{
context.Error($"Rule [{rule.Name}] assigns [{nameof(ProxyPort)}={ProxyPort}] which is outside the range of valid frontend ports for this traffic manager [{context.Settings.ProxyPorts}].");
}
}
else
{
if (CertName == null)
{
ProxyPort = context.Settings.DefaultHttpPort;
}
else
{
ProxyPort = context.Settings.DefaultHttpsPort;
}
}
if (PublicPort == -1)
{
if (CertName == null)
{
PublicPort = NetworkPorts.HTTP;
}
else
{
PublicPort = NetworkPorts.HTTPS;
}
}
if (PublicPort > 0 && !NetHelper.IsValidPort(PublicPort))
{
context.Error($"Load balancer [{nameof(PublicPort)}={PublicPort}] is not a valid network port.");
}
if (RedirectTo != null)
{
// Strip off the path/query part of the URI, if necessary.
if (RedirectTo.PathAndQuery != "/")
{
RedirectTo = new Uri($"{RedirectTo.Scheme}://{RedirectTo.Host}:{RedirectTo.Port}/");
}
}
}
/// <summary>
/// Validates the traffic manager definition.
/// </summary>
/// <param name="certificates">The dictionary of hive certificates keyed by name.</param>
/// <returns>The <see cref="TrafficValidationContext"/>.</returns>
public TrafficValidationContext Validate(Dictionary <string, TlsCertificate> certificates)
{
Covenant.Requires <ArgumentNullException>(certificates != null);
var context = new TrafficValidationContext(Name, Settings, certificates);
// Validate the existing settings and rules.
Settings.Validate(context);
foreach (var rule in Rules.Values)
{
rule.Validate(context);
}
// Verify that there are no existing frontend port/host conflicts:
//
// * HTTP rules can share ports but hostnames must be unique.
// * HTTP rules on the same port cannot mix TLS and non-TLS.
// * Only one TCP port per rule is allowed.
var httpMap = new Dictionary <string, TrafficHttpRule>(StringComparer.OrdinalIgnoreCase);
var httpPortToTls = new Dictionary <int, bool>();
var tcpMap = new Dictionary <int, TrafficTcpRule>();
// Scan HTTP rules.
foreach (var rule in Rules.Values.Where(r => r.Mode == TrafficMode.Http).OrderBy(r => r.Name.ToLowerInvariant()))
{
var httpRule = (TrafficHttpRule)rule;
foreach (var frontend in httpRule.Frontends)
{
var key = $"{frontend.Host}:{frontend.ProxyPort}";
if (!string.IsNullOrEmpty(frontend.PathPrefix))
{
key += frontend.PathPrefix;
}
if (httpMap.ContainsKey(key))
{
context.Error($"HTTP rule [{httpRule.Name}] has a frontend on [{key}] that conflicts with rule [{httpMap[key].Name}].");
continue;
}
httpMap.Add(key, httpRule);
if (!httpPortToTls.TryGetValue(frontend.ProxyPort, out var isTls))
{
isTls = frontend.Tls;
httpPortToTls.Add(frontend.ProxyPort, isTls);
}
if (isTls != frontend.Tls)
{
if (frontend.Tls)
{
context.Error($"HTTP rule [{httpRule.Name}] has a TLS frontend on port [{frontend.ProxyPort}] that conflicts with non-TLS frontends on this port.");
}
else
{
context.Error($"HTTP rule [{httpRule.Name}] has a non-TLS frontend on port [{frontend.ProxyPort}] that conflicts with TLS frontends on this port.");
}
}
}
}
// Scan the TCP rules.
foreach (var rule in Rules.Values.Where(r => r.Mode == TrafficMode.Tcp).OrderBy(r => r.Name.ToLowerInvariant()))
{
var tcpRule = (TrafficTcpRule)rule;
foreach (var frontend in tcpRule.Frontends)
{
var port = frontend.ProxyPort;
if (port == Settings.DefaultHttpPort || port == Settings.DefaultHttpsPort)
{
context.Error($"TCP rule [{tcpRule.Name}] has a frontend on [{port}] that conflicts the default traffic manager HTTP or HTTPS port.");
}
if (httpPortToTls.ContainsKey(port))
{
context.Error($"TCP rule [{tcpRule.Name}] has a frontend on [{port}] that conflicts with one or more HTTP traffic manager frontends on the same port.");
}
if (tcpMap.ContainsKey(port))
{
context.Error($"TCP rule [{tcpRule.Name}] has a frontend on [{port}] that conflicts with rule [{tcpMap[port].Name}].");
}
tcpMap.Add(port, tcpRule);
}
}
return(context);
}
/// <summary>
/// Validates the rule.
/// </summary>
/// <param name="context">The validation context.</param>
public override void Validate(TrafficValidationContext context)
{
base.Validate(context);
Frontends = Frontends ?? new List <TrafficHttpFrontend>();
Backends = Backends ?? new List <TrafficHttpBackend>();
if (Frontends.Count == 0)
{
context.Error($"Rule [{Name}] has does not define a frontend.");
}
if (!string.IsNullOrEmpty(CheckUri))
{
if (!Uri.TryCreate(CheckUri, UriKind.Relative, out var uri))
{
context.Error($"Rule [{Name}] has invalid [{nameof(CheckUri)}={CheckUri}].");
}
}
if (string.IsNullOrEmpty(CheckMethod) || CheckMethod.IndexOfAny(new char[] { ' ', '\r', '\n', '\t' }) != -1)
{
context.Error($"Rule [{Name}] has invalid [{nameof(CheckMethod)}={CheckMethod}].");
}
if (string.IsNullOrEmpty(CheckVersion))
{
CheckVersion = "1.0";
}
var regex = new Regex(@"^\d+\.\d+$");
if (!regex.Match(CheckVersion).Success)
{
context.Error($"Rule [{Name}] has invalid [{nameof(CheckVersion)}={CheckVersion}].");
}
if (!string.IsNullOrEmpty(CheckHost) && !HiveDefinition.DnsHostRegex.Match(CheckHost).Success)
{
context.Error($"Rule [{Name}] has invalid [{nameof(CheckHost)}={CheckHost}].");
}
if (!string.IsNullOrEmpty(CheckExpect))
{
var error = $"Rule [{Name}] has invalid [{nameof(CheckExpect)}={CheckExpect}].";
var value = CheckExpect.Trim();
if (value.StartsWith("! "))
{
value = value.Substring(2).Trim();
}
var pos = value.IndexOf(' ');
if (pos == -1)
{
context.Error(error + " Expected: <match> <pattern>");
}
else
{
var match = value.Substring(0, pos);
var pattern = value.Substring(pos).Trim();
if (pattern.Replace("\\ ", string.Empty).IndexOf(' ') != -1)
{
context.Error(error + $" Pattern [{pattern}] includes unescaped spaces.");
}
switch (match)
{
case "status":
case "string":
break;
case "rstatus":
case "rstring":
try
{
new Regex(pattern);
}
catch (Exception e)
{
context.Error(error + $" Pattern regex [{pattern}] parsing error: {e.Message}.");
}
break;
default:
context.Error(error + " Invalid [match], expected one of: status, rstatus, string, rstring");
break;
}
}
}
foreach (var frontend in Frontends)
{
frontend.Validate(context, this);
}
foreach (var backend in Backends)
{
backend.Validate(context, this);
}
// Verify that the port/host combinations are unique for each frontend.
var frontendMap = new HashSet <string>(StringComparer.OrdinalIgnoreCase);
foreach (var frontend in Frontends)
{
if (string.IsNullOrEmpty(frontend.PathPrefix))
{
var key = $"{frontend.Host}:{frontend.ProxyPort}";
if (frontendMap.Contains(key))
{
context.Error($"HTTP rule [{Name}] includes two or more frontends that map to [{key}].");
}
frontendMap.Add(key);
}
}
foreach (var frontend in Frontends)
{
if (!string.IsNullOrEmpty(frontend.PathPrefix))
{
var key = $"{frontend.Host}:{frontend.ProxyPort}{frontend.PathPrefix}";
if (frontendMap.Contains($"{frontend.Host}:{frontend.ProxyPort}") || // Ensure there's no *all* path frontend
frontendMap.Contains(key))
{
context.Error($"HTTP rule [{Name}] includes two or more frontends that map to [{key}].");
}
frontendMap.Add(key);
}
}
if (Cache != null && Cache.Enabled)
{
Cache.Validate(context, this);
// The Varnish open source release doesn't support TLS backends. This requires
// Varnish Plus (of course) which is very expensive.
foreach (TrafficHttpBackend backend in Backends)
{
if (backend.Tls)
{
context.Error($"HTTP rule [{Name}] cannot support caching because one or more backends required TLS.");
break;
}
}
// Varnish doesn't support comparing health probe status codes with a regex
// like HAProxy does. We're going to enforce having CheckExpect set to
// something like "status 200".
var statusFields = CheckExpect.Split(' ');
if (statusFields.Length != 2 || statusFields[0] != "status" ||
!int.TryParse(statusFields[1], out var statusCode) ||
statusCode < 100 || 600 <= statusCode)
{
context.Error($"HTTP rule [{Name}] cannot support caching because [{nameof(CheckExpect)}={CheckExpect}] doesn't specify a fixed status code like [status 200]. Varnish-Cache does not support verifying health probe status codes as regular expressions like HAProxy can.");
}
// $todo(jeff.lill):
//
// We need to enforce some restrictions due to Varnish limitations
// described here:
//
// https://github.com/jefflill/NeonForge/issues/379
//
// It would be nice to revisit this in the future.
// Ensure that:
//
// * If one backend has a hostname then it must be the only backend.
// * IP address and hostname backends cannot be mixed.
if (Backends.Count > 1)
{
var hasHostname = false;
var hasIPAddress = false;
foreach (var backend in Backends)
{
if (IPAddress.TryParse(backend.Server, out var address))
{
hasIPAddress = true;
}
else
{
hasHostname = true;
}
}
if (hasIPAddress)
{
context.Error($"HTTP rule [{Name}] has multiple backends reachable via hostname which is not supported. You may define only a single backend that requires a DNS lookup.");
}
else if (hasIPAddress && hasHostname)
{
context.Error($"HTTP rule [{Name}] has backends reachable via IP address and hostname which is not supported. You cannot mix backends with IP address and hostnames in the same rule.");
}
}
// Ensure that all cache warming targets have schemes, hostnames, ports that
// match a rule frontend, and that HTTP rules don't map to reserved HTTPS ports
// and HTTPS rules don't map to reserved HTTP ports.
foreach (var frontend in Frontends)
{
if (frontend.Tls)
{
if (frontend.ProxyPort == HiveHostPorts.ProxyPublicHttp || frontend.ProxyPort == HiveHostPorts.ProxyPrivateHttp)
{
context.Error($"Rule [{Name}] has an HTTPS frontend with [{nameof(frontend.ProxyPort)}={frontend.ProxyPort}] that is incorrectly mapped to a reserved HTTP port.");
}
}
else
{
if (frontend.ProxyPort == HiveHostPorts.ProxyPublicHttps || frontend.ProxyPort == HiveHostPorts.ProxyPrivateHttps)
{
context.Error($"Rule [{Name}] has an HTTP frontend with [{nameof(frontend.ProxyPort)}={frontend.ProxyPort}] that is incorrectly mapped to a reserved HTTPS port.");
}
}
}
// Ensure that all cache warming targets have schemes, hostnames, and ports that
// match a rule frontend.
foreach (var warmTarget in Cache.WarmTargets)
{
var uri = new Uri(warmTarget.Uri);
var tls = uri.Scheme.Equals("https", StringComparison.InvariantCultureIgnoreCase);
if (Frontends.IsEmpty(fe => fe.Tls == tls && fe.Host.Equals(uri.Host, StringComparison.InvariantCultureIgnoreCase) && fe.ProxyPort == uri.Port))
{
context.Error($"Cache warm target [{uri}] does not match one of the [{Name}] traffic manager frontends.");
}
}
}
}