从下面的源代码，
- UR: UPSTREAM_REMOTE_RESET 如果在流上接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}, };