syntax = "proto3";

package envoy.data.accesslog.v2;

import "envoy/api/v2/core/address.proto";
import "envoy/api/v2/core/base.proto";

import "google/protobuf/duration.proto";
import "google/protobuf/timestamp.proto";
import "google/protobuf/wrappers.proto";
import "gogoproto/gogo.proto";
import "validate/validate.proto";

// [#protodoc-title: gRPC access logs]
// Envoy access logs describe incoming interaction with Envoy over a fixed
// period of time, and typically cover a single request/response exchange,
// (e.g. HTTP), stream (e.g. over HTTP/gRPC), or proxied connection (e.g. TCP).
// Access logs contain fields defined in protocol-specific protobuf messages.
//
// Except where explicitly declared otherwise, all fields describe
// *downstream* interaction between Envoy and a connected client.
// Fields describing *upstream* interaction will explicitly include ``upstream``
// in their name.

// [#not-implemented-hide:]
message TCPAccessLogEntry {
  // Common properties shared by all Envoy access logs.
  AccessLogCommon common_properties = 1;
}

message HTTPAccessLogEntry {
  // Common properties shared by all Envoy access logs.
  AccessLogCommon common_properties = 1;

  // HTTP version
  enum HTTPVersion {
    PROTOCOL_UNSPECIFIED = 0;
    HTTP10 = 1;
    HTTP11 = 2;
    HTTP2 = 3;
  }
  HTTPVersion protocol_version = 2;

  // Description of the incoming HTTP request.
  HTTPRequestProperties request = 3;

  // Description of the outgoing HTTP response.
  HTTPResponseProperties response = 4;
}

// Defines fields that are shared by all Envoy access logs.
message AccessLogCommon {
  // [#not-implemented-hide:]
  // This field indicates the rate at which this log entry was sampled.
  // Valid range is (0.0, 1.0].
  double sample_rate = 1 [(validate.rules).double.gt = 0.0, (validate.rules).double.lte = 1.0];

  // This field is the remote/origin address on which the request from the user was received.
  // Note: This may not be the physical peer. E.g, if the remote address is inferred from for
  // example the x-forwarder-for header, proxy protocol, etc.
  envoy.api.v2.core.Address downstream_remote_address = 2;

  // This field is the local/destination address on which the request from the user was received.
  envoy.api.v2.core.Address downstream_local_address = 3;

  // [#not-implemented-hide:]
  // If the connection is secure,S this field will contain TLS properties.
  TLSProperties tls_properties = 4;

  // The time that Envoy started servicing this request. This is effectively the time that the first
  // downstream byte is received.
  google.protobuf.Timestamp start_time = 5 [(gogoproto.stdtime) = true];

  // Interval between the first downstream byte received and the last
  // downstream byte received (i.e. time it takes to receive a request).
  google.protobuf.Duration time_to_last_rx_byte = 6 [(gogoproto.stdduration) = true];

  // Interval between the first downstream byte received and the first upstream byte sent. There may
  // by considerable delta between *time_to_last_rx_byte* and this value due to filters.
  // Additionally, the same caveats apply as documented in *time_to_last_downstream_tx_byte* about
  // not accounting for kernel socket buffer time, etc.
  google.protobuf.Duration time_to_first_upstream_tx_byte = 7 [(gogoproto.stdduration) = true];

  // Interval between the first downstream byte received and the last upstream byte sent. There may
  // by considerable delta between *time_to_last_rx_byte* and this value due to filters.
  // Additionally, the same caveats apply as documented in *time_to_last_downstream_tx_byte* about
  // not accounting for kernel socket buffer time, etc.
  google.protobuf.Duration time_to_last_upstream_tx_byte = 8 [(gogoproto.stdduration) = true];

  // Interval between the first downstream byte received and the first upstream
  // byte received (i.e. time it takes to start receiving a response).
  google.protobuf.Duration time_to_first_upstream_rx_byte = 9 [(gogoproto.stdduration) = true];

  // Interval between the first downstream byte received and the last upstream
  // byte received (i.e. time it takes to receive a complete response).
  google.protobuf.Duration time_to_last_upstream_rx_byte = 10 [(gogoproto.stdduration) = true];

  // Interval between the first downstream byte received and the first downstream byte sent.
  // There may be a considerable delta between the *time_to_first_upstream_rx_byte* and this field
  // due to filters. Additionally, the same caveats apply as documented in
  // *time_to_last_downstream_tx_byte* about not accounting for kernel socket buffer time, etc.
  google.protobuf.Duration time_to_first_downstream_tx_byte = 11 [(gogoproto.stdduration) = true];

  // Interval between the first downstream byte received and the last downstream byte sent.
  // Depending on protocol, buffering, windowing, filters, etc. there may be a considerable delta
  // between *time_to_last_upstream_rx_byte* and this field. Note also that this is an approximate
  // time. In the current implementation it does not include kernel socket buffer time. In the
  // current implementation it also does not include send window buffering inside the HTTP/2 codec.
  // In the future it is likely that work will be done to make this duration more accurate.
  google.protobuf.Duration time_to_last_downstream_tx_byte = 12 [(gogoproto.stdduration) = true];

  // The upstream remote/destination address that handles this exchange. This does not include
  // retries.
  envoy.api.v2.core.Address upstream_remote_address = 13;

  // The upstream local/origin address that handles this exchange. This does not include retries.
  envoy.api.v2.core.Address upstream_local_address = 14;

  // The upstream cluster that *upstream_remote_address* belongs to.
  string upstream_cluster = 15;

  // Flags indicating occurrences during request/response processing.
  ResponseFlags response_flags = 16;

  // All metadata encountered during request processing, including endpoint
  // selection.
  //
  // This can be used to associate IDs attached to the various configurations
  // used to process this request with the access log entry. For example, a
  // route created from a higher level forwarding rule with some ID can place
  // that ID in this field and cross reference later. It can also be used to
  // determine if a canary endpoint was used or not.
  envoy.api.v2.core.Metadata metadata = 17;
}

// Flags indicating occurrences during request/response processing.
message ResponseFlags {
  // Indicates local server healthcheck failed.
  bool failed_local_healthcheck = 1;

  // Indicates there was no healthy upstream.
  bool no_healthy_upstream = 2;

  // Indicates an there was an upstream request timeout.
  bool upstream_request_timeout = 3;

  // Indicates local codec level reset was sent on the stream.
  bool local_reset = 4;

  // Indicates remote codec level reset was received on the stream.
  bool upstream_remote_reset = 5;

  // Indicates there was a local reset by a connection pool due to an initial connection failure.
  bool upstream_connection_failure = 6;

  // Indicates the stream was reset due to an upstream connection termination.
  bool upstream_connection_termination = 7;

  // Indicates the stream was reset because of a resource overflow.
  bool upstream_overflow = 8;

  // Indicates no route was found for the request.
  bool no_route_found = 9;

  // Indicates that the request was delayed before proxying.
  bool delay_injected = 10;

  // Indicates that the request was aborted with an injected error code.
  bool fault_injected = 11;

  // Indicates that the request was rate-limited locally.
  bool rate_limited = 12;

  message Unauthorized {
    // Reasons why the request was unauthorized
    enum Reason {
      REASON_UNSPECIFIED = 0;
      // The request was denied by the external authorization service.
      EXTERNAL_SERVICE = 1;
    }

    Reason reason = 1;
  }

  // Indicates if the request was deemed unauthorized and the reason for it.
  Unauthorized unauthorized_details = 13;

  // [#not-implemented-hide:] Hide from docs.
  // Indicates that the request was rejected because there was an error in rate limit service.
  bool rate_limit_service_error = 14;

  // Indicates the stream was reset due to a downstream connection termination.
  bool downstream_connection_termination = 15;
}

// [#not-implemented-hide:]
// Properties of a negotiated TLS connection.
message TLSProperties {
  enum TLSVersion {
    VERSION_UNSPECIFIED = 0;
    TLSv1 = 1;
    TLSv1_1 = 2;
    TLSv1_2 = 3;
    TLSv1_3 = 4;
  }
  // Version of TLS that was negotiated.
  TLSVersion tls_version = 1;

  // TLS cipher suite negotiated during handshake. The value is a
  // four-digit hex code defined by the IANA TLS Cipher Suite Registry
  // (e.g. ``009C`` for ``TLS_RSA_WITH_AES_128_GCM_SHA256``).
  //
  // Here it is expressed as an integer.
  google.protobuf.UInt32Value tls_cipher_suite = 2;

  // SNI hostname from handshake.
  string tls_sni_hostname = 3;
}

message HTTPRequestProperties {
  // The request method (RFC 7231/2616).
  // [#comment:TODO(htuch): add (validate.rules).enum.defined_only = true once
  // https://github.com/lyft/protoc-gen-validate/issues/42 is resolved.]
  envoy.api.v2.core.RequestMethod request_method = 1;

  // The scheme portion of the incoming request URI.
  string scheme = 2;

  // HTTP/2 ``:authority`` or HTTP/1.1 ``Host`` header value.
  string authority = 3;

  // The port of the incoming request URI
  // (unused currently, as port is composed onto authority).
  google.protobuf.UInt32Value port = 4;

  // The path portion from the incoming request URI.
  string path = 5;

  // Value of the ``User-Agent`` request header.
  string user_agent = 6;

  // Value of the ``Referer`` request header.
  string referer = 7;

  // Value of the ``X-Forwarded-For`` request header.
  string forwarded_for = 8;

  // Value of the ``X-Request-Id`` request header
  //
  // This header is used by Envoy to uniquely identify a request.
  // It will be generated for all external requests and internal requests that
  // do not already have a request ID.
  string request_id = 9;

  // Value of the ``X-Envoy-Original-Path`` request header.
  string original_path = 10;

  // Size of the HTTP request headers in bytes.
  //
  // This value is captured from the OSI layer 7 perspective, i.e. it does not
  // include overhead from framing or encoding at other networking layers.
  uint64 request_headers_bytes = 11;

  // Size of the HTTP request body in bytes.
  //
  // This value is captured from the OSI layer 7 perspective, i.e. it does not
  // include overhead from framing or encoding at other networking layers.
  uint64 request_body_bytes = 12;

  // Map of additional headers that have been configured to be logged.
  map<string, string> request_headers = 13;
}

message HTTPResponseProperties {
  // The HTTP response code returned by Envoy.
  google.protobuf.UInt32Value response_code = 1;

  // Size of the HTTP response headers in bytes.
  //
  // This value is captured from the OSI layer 7 perspective, i.e. it does not
  // include overhead from framing or encoding at other networking layers.
  uint64 response_headers_bytes = 2;

  // Size of the HTTP response body in bytes.
  //
  // This value is captured from the OSI layer 7 perspective, i.e. it does not
  // include overhead from framing or encoding at other networking layers.
  uint64 response_body_bytes = 3;

  // Map of additional headers configured to be logged.
  map<string, string> response_headers = 4;

  // Map of trailers configured to be logged.
  map<string, string> response_trailers = 5;
}