// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

syntax = "proto3";

package hashicorp.consul.mesh.v1alpha1;

import "google/protobuf/duration.proto";
import "pbcatalog/v1alpha1/selector.proto";
import "pbmesh/v1alpha1/connection.proto";
import "pbmesh/v1alpha1/routing.proto";
import "pbresource/resource.proto";

message Upstreams {
  // Selection of workloads these upstreams should apply to.
  // These can be prefixes or specific workload names.
  hashicorp.consul.catalog.v1alpha1.WorkloadSelector workloads = 1;

  repeated Upstream upstreams = 2;
  repeated PreparedQueryUpstream pq_upstreams = 3;

  UpstreamConfig upstream_config = 4;
}

message Upstream {
  hashicorp.consul.resource.ID destination_ref = 1;
  string destination_port = 2;
  string datacenter = 3;

  oneof listen_addr {
    TCPAddress tcp = 4;
    UnixSocketAddress unix = 5;
  }

  UpstreamConfig upstream_config = 7;
}

message TCPAddress {
  string ip = 1;
  uint32 port = 2;
}

message UnixSocketAddress {
  string path = 1;
  string mode = 2;
}

message PreparedQueryUpstream {
  string name = 1;
  string datacenter = 2;

  oneof listen_addr {
    TCPAddress tcp = 4;
    UnixSocketAddress unix = 5;
  }

  UpstreamConfig upstream_config = 6;
}

message UpstreamConfig {
  uint64 connect_timeout_ms = 2;
  UpstreamLimits limits = 3;
  PassiveHealthCheck passive_health_check = 4;
  BalanceConnections balance_outbound_connections = 5;
  MeshGatewayMode mesh_gateway_mode = 6;
}

// UpstreamLimits describes the limits that are associated with a specific
// upstream of a service instance.
message UpstreamLimits {
  // MaxConnections is the maximum number of connections the local proxy can
  // make to the upstream service.
  int32 max_connections = 1;

  // MaxPendingRequests is the maximum number of requests that will be queued
  // waiting for an available connection. This is mostly applicable to HTTP/1.1
  // clusters since all HTTP/2 requests are streamed over a single
  // connection.
  int32 max_pending_requests = 2;

  // MaxConcurrentRequests is the maximum number of in-flight requests that will be allowed
  // to the upstream cluster at a point in time. This is mostly applicable to HTTP/2
  // clusters since all HTTP/1.1 requests are limited by MaxConnections.
  int32 max_concurrent_requests = 3;
}

message PassiveHealthCheck {
  // Interval between health check analysis sweeps. Each sweep may remove
  // hosts or return hosts to the pool.
  google.protobuf.Duration interval = 1;

  // MaxFailures is the count of consecutive failures that results in a host
  // being removed from the pool.
  uint32 max_failures = 2;

  // EnforcingConsecutive5xx is the % chance that a host will be actually ejected
  // when an outlier status is detected through consecutive 5xx.
  // This setting can be used to disable ejection or to ramp it up slowly. Defaults to 100.
  uint32 enforcing_consecutive_5xx = 3;
}