envoyproxy - 各种Envoy RESPONSE_FLAGS的原因是什么

Question

我正在尝试调试服务网格，Envoy 位于中间。访问日志显示了很多 503，它们的 %RESPONSE_FLAGS% 各不相同。 .除了 the access logging docs ，我找不到关于标志实际含义的任何解释。
例如，精辟地，NR意思是“我向下游发送了 404，但不是因为上游向我发送了一个，而是因为我没有匹配的路由，所以我，特使生成了 404”。我会喜欢像这样的单衬线用于其他一些。特别是我在苦苦挣扎(这些都出现在我们的日志中......)

UR对比 UC - 我认为这些是“我向下游发送了 503，因为我连接了上游，但随后出现了问题”。什么问题？具体怎么做remote reset对比 connection termination意思？

LR connection local reset - 这是什么意思？特使向下游发送了 503，因为它决定停止与上游对话，中途？为什么会那样做？

<no flag> - 我是否正确地假设如果有像 404 这样的错误代码或 503没有 RESPONSE_FLAGS ，那个代码是由上游发送的，只是被转发了？

Answer 1

从下面的源代码，

UR: UPSTREAM_REMOTE_RESET 如果在流上收到远程编解码器级别重置。

UC: UPSTREAM_CONNECTION_TERMINATION 如果流因连接终止而在本地重置。

LR:如果在流上发送了本地编解码器级别重置

/**
 * Stream reset reasons.
 */
enum class StreamResetReason {                                                                                                                                                                                                                                // If a local codec level reset was sent on the stream.
  LocalReset,
  // If a local codec level refused stream reset was sent on the stream (allowing for retry).
  LocalRefusedStreamReset,
  // If a remote codec level reset was received on the stream.
  RemoteReset,
  // If a remote codec level refused stream reset was received on the stream (allowing for retry).
  RemoteRefusedStreamReset,
  // If the stream was locally reset by a connection pool due to an initial connection failure.
  ConnectionFailure,
  // If the stream was locally reset due to connection termination.
  ConnectionTermination,
  // The stream was reset because of a resource overflow.
  Overflow,
  // Either there was an early TCP error for a CONNECT request or the peer reset with CONNECT_ERROR
  ConnectError,
  // Received payload did not conform to HTTP protocol.
  ProtocolError
};

StreamInfo::ResponseFlag
Filter::streamResetReasonToResponseFlag(Http::StreamResetReason reset_reason) {                                                                                                                                                                               switch (reset_reason) {
  case Http::StreamResetReason::ConnectionFailure:                                                                                                                                                                                                              return StreamInfo::ResponseFlag::UpstreamConnectionFailure;
  case Http::StreamResetReason::ConnectionTermination:
    return StreamInfo::ResponseFlag::UpstreamConnectionTermination;
  case Http::StreamResetReason::LocalReset:
  case Http::StreamResetReason::LocalRefusedStreamReset:
    return StreamInfo::ResponseFlag::LocalReset;
  case Http::StreamResetReason::Overflow:
    return StreamInfo::ResponseFlag::UpstreamOverflow;
  case Http::StreamResetReason::RemoteReset:
  case Http::StreamResetReason::RemoteRefusedStreamReset:
  case Http::StreamResetReason::ConnectError:
    return StreamInfo::ResponseFlag::UpstreamRemoteReset;
  case Http::StreamResetReason::ProtocolError:
    return StreamInfo::ResponseFlag::UpstreamProtocolError;
  }

  NOT_REACHED_GCOVR_EXCL_LINE;
}

constexpr static absl::string_view NONE = "-";                                                                                                                                                                                                              constexpr static absl::string_view DOWNSTREAM_CONNECTION_TERMINATION = "DC";                                                                                                                                                                                constexpr static absl::string_view FAILED_LOCAL_HEALTH_CHECK = "LH";                                                                                                                                                                                        constexpr static absl::string_view NO_HEALTHY_UPSTREAM = "UH";                                                                                                                                                                                              constexpr static absl::string_view UPSTREAM_REQUEST_TIMEOUT = "UT";                                                                                                                                                                                         constexpr static absl::string_view LOCAL_RESET = "LR";                                                                                                                                                                                                      constexpr static absl::string_view UPSTREAM_REMOTE_RESET = "UR";                                                                                                                                                                                            constexpr static absl::string_view UPSTREAM_CONNECTION_FAILURE = "UF";                                                                                                                                                                                      constexpr static absl::string_view UPSTREAM_CONNECTION_TERMINATION = "UC";                                                                                                                                                                                  constexpr static absl::string_view UPSTREAM_OVERFLOW = "UO";                                                                                                                                                                                                constexpr static absl::string_view UPSTREAM_RETRY_LIMIT_EXCEEDED = "URX";                                                                                                                                                                                   constexpr static absl::string_view NO_ROUTE_FOUND = "NR";                                                                                                                                                                                                   constexpr static absl::string_view DELAY_INJECTED = "DI";                                                                                                                                                                                                   constexpr static absl::string_view FAULT_INJECTED = "FI";                                                                                                                                                                                                   constexpr static absl::string_view RATE_LIMITED = "RL";                                                                                                                                                                                                     constexpr static absl::string_view UNAUTHORIZED_EXTERNAL_SERVICE = "UAEX";                                                                                                                                                                                  constexpr static absl::string_view RATELIMIT_SERVICE_ERROR = "RLSE";                                                                                                                                                                                        constexpr static absl::string_view STREAM_IDLE_TIMEOUT = "SI";                                                                                                                                                                                              constexpr static absl::string_view INVALID_ENVOY_REQUEST_HEADERS = "IH";                                                                                                                                                                                    constexpr static absl::string_view DOWNSTREAM_PROTOCOL_ERROR = "DPE";                                                                                                                                                                                       constexpr static absl::string_view UPSTREAM_MAX_STREAM_DURATION_REACHED = "UMSDR";                                                                                                                                                                          constexpr static absl::string_view RESPONSE_FROM_CACHE_FILTER = "RFCF";                                                                                                                                                                                     constexpr static absl::string_view NO_FILTER_CONFIG_FOUND = "NFCF";                                                                                                                                                                                         constexpr static absl::string_view DURATION_TIMEOUT = "DT";                                                                                                                                                                                                 constexpr static absl::string_view UPSTREAM_PROTOCOL_ERROR = "UPE";                                                                                                                                                                                         constexpr static absl::string_view NO_CLUSTER_FOUND = "NC";                                                                                                                                                                                                                                                                                                                                                                                                                                                             static constexpr std::array ALL_RESPONSE_STRING_FLAGS{                                                                                                                                                                                                          FlagStringAndEnum{FAILED_LOCAL_HEALTH_CHECK, ResponseFlag::FailedLocalHealthCheck},                                                                                                                                                                         FlagStringAndEnum{NO_HEALTHY_UPSTREAM, ResponseFlag::NoHealthyUpstream},                                                                                                                                                                                    FlagStringAndEnum{UPSTREAM_REQUEST_TIMEOUT, ResponseFlag::UpstreamRequestTimeout},                                                                                                                                                                          FlagStringAndEnum{LOCAL_RESET, ResponseFlag::LocalReset},                                                                                                                                                                                                   FlagStringAndEnum{UPSTREAM_REMOTE_RESET, ResponseFlag::UpstreamRemoteReset},                                                                                                                                                                                FlagStringAndEnum{UPSTREAM_CONNECTION_FAILURE, ResponseFlag::UpstreamConnectionFailure},                                                                                                                                                                    FlagStringAndEnum{UPSTREAM_CONNECTION_TERMINATION,                                                                                                                                                                                                                            ResponseFlag::UpstreamConnectionTermination},                                                                                                                                                                                             FlagStringAndEnum{UPSTREAM_OVERFLOW, ResponseFlag::UpstreamOverflow},                                                                                                                                                                                       FlagStringAndEnum{NO_ROUTE_FOUND, ResponseFlag::NoRouteFound},                                                                                                                                                                                              FlagStringAndEnum{DELAY_INJECTED, ResponseFlag::DelayInjected},                                                                                                                                                                                             FlagStringAndEnum{FAULT_INJECTED, ResponseFlag::FaultInjected},                                                                                                                                                                                             FlagStringAndEnum{RATE_LIMITED, ResponseFlag::RateLimited},                                                                                                                                                                                                 FlagStringAndEnum{UNAUTHORIZED_EXTERNAL_SERVICE, ResponseFlag::UnauthorizedExternalService},                                                                                                                                                                FlagStringAndEnum{RATELIMIT_SERVICE_ERROR, ResponseFlag::RateLimitServiceError},                                                                                                                                                                            FlagStringAndEnum{DOWNSTREAM_CONNECTION_TERMINATION,                                                                                                                                                                                                                          ResponseFlag::DownstreamConnectionTermination},                                                                                                                                                                                           FlagStringAndEnum{UPSTREAM_RETRY_LIMIT_EXCEEDED, ResponseFlag::UpstreamRetryLimitExceeded},                                                                                                                                                                 FlagStringAndEnum{STREAM_IDLE_TIMEOUT, ResponseFlag::StreamIdleTimeout},                                                                                                                                                                                    FlagStringAndEnum{INVALID_ENVOY_REQUEST_HEADERS, ResponseFlag::InvalidEnvoyRequestHeaders},                                                                                                                                                                 FlagStringAndEnum{DOWNSTREAM_PROTOCOL_ERROR, ResponseFlag::DownstreamProtocolError},                                                                                                                                                                        FlagStringAndEnum{UPSTREAM_MAX_STREAM_DURATION_REACHED,                                                                                                                                                                                                                       ResponseFlag::UpstreamMaxStreamDurationReached},                                                                                                                                                                                          FlagStringAndEnum{RESPONSE_FROM_CACHE_FILTER, ResponseFlag::ResponseFromCacheFilter},                                                                                                                                                                       FlagStringAndEnum{NO_FILTER_CONFIG_FOUND, ResponseFlag::NoFilterConfigFound},                                                                                                                                                                               FlagStringAndEnum{DURATION_TIMEOUT, ResponseFlag::DurationTimeout},                                                                                                                                                                                         FlagStringAndEnum{UPSTREAM_PROTOCOL_ERROR, ResponseFlag::UpstreamProtocolError},                                                                                                                                                                            FlagStringAndEnum{NO_CLUSTER_FOUND, ResponseFlag::NoClusterFound},                                                                                                                                                                                      };