Protocol Documentation

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Table of Contents

• relay/relay.proto

  • NodeStatusEvent

  • NodeState

• Scalar Value Types

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relay/relay.proto

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NodeStatusEvent

NodeStatusEvent is a message sent by hubble-relay to inform clients about the state of a particular node.

Field	Type	Label	Description
state_change	NodeState		state_change contains the new node state
node_names	string	repeated	node_names is the list of nodes for which the above state changes applies
message	string		message is an optional message attached to the state change (e.g. an error message). The message applies to all nodes in node_names.

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NodeState

Name	Number	Description
UNKNOWN_NODE_STATE	0	UNKNOWN_NODE_STATE indicates that the state of this node is unknown.
NODE_CONNECTED	1	NODE_CONNECTED indicates that we have established a connection to this node. The client can expect to observe flows from this node.
NODE_UNAVAILABLE	2	NODE_UNAVAILABLE indicates that the connection to this node is currently unavailable. The client can expect to not see any flows from this node until either the connection is re-established or the node is gone.
NODE_GONE	3	NODE_GONE indicates that a node has been removed from the cluster. No reconnection attempts will be made.
NODE_ERROR	4	NODE_ERROR indicates that a node has reported an error while processing the request. No reconnection attempts will be made.

Scalar Value Types

.proto Type	Notes	C++	Java	Python	Go	C#	PHP	Ruby
<a name="double" /> double		double	double	float	float64	double	float	Float
<a name="float" /> float		float	float	float	float32	float	float	Float
<a name="int32" /> int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int	int32	int	integer	Bignum or Fixnum (as required)
<a name="int64" /> int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long	int64	long	integer/string	Bignum
<a name="uint32" /> uint32	Uses variable-length encoding.	uint32	int	int/long	uint32	uint	integer	Bignum or Fixnum (as required)
<a name="uint64" /> uint64	Uses variable-length encoding.	uint64	long	int/long	uint64	ulong	integer/string	Bignum or Fixnum (as required)
<a name="sint32" /> sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int	int32	int	integer	Bignum or Fixnum (as required)
<a name="sint64" /> sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long	int64	long	integer/string	Bignum
<a name="fixed32" /> fixed32	Always four bytes. More efficient than uint32 if values are often greater than 2^28.	uint32	int	int	uint32	uint	integer	Bignum or Fixnum (as required)
<a name="fixed64" /> fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 2^56.	uint64	long	int/long	uint64	ulong	integer/string	Bignum
<a name="sfixed32" /> sfixed32	Always four bytes.	int32	int	int	int32	int	integer	Bignum or Fixnum (as required)
<a name="sfixed64" /> sfixed64	Always eight bytes.	int64	long	int/long	int64	long	integer/string	Bignum
<a name="bool" /> bool		bool	boolean	boolean	bool	bool	boolean	TrueClass/FalseClass
<a name="string" /> string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	str/unicode	string	string	string	String (UTF-8)
<a name="bytes" /> bytes	May contain any arbitrary sequence of bytes.	string	ByteString	str	[]byte	ByteString	string	String (ASCII-8BIT)