Documentation ¶
Index ¶
- Constants
- Variables
- func GetJSON(url string, out interface{}) error
- func HostIP() (net.IP, error)
- func NewRand(seed int64) *rand.Rand
- func PackIPAsUint32(ip net.IP) uint32
- func ParseIPToUint32(ip string) (uint32, error)
- func ParsePort(portString string) (uint16, error)
- func ReadJSON(resp *http.Response, out interface{}) error
- type AgentClientUDP
- type RateLimiter
Constants ¶
const UDPPacketMaxLength = 65000
UDPPacketMaxLength is the max size of UDP packet we want to send, synced with jaeger-agent
Variables ¶
var ( // ErrEmptyIP an error for empty ip strings ErrEmptyIP = errors.New("empty string given for ip") // ErrNotHostColonPort an error for invalid host port string ErrNotHostColonPort = errors.New("expecting host:port") // ErrNotFourOctets an error for the wrong number of octets after splitting a string ErrNotFourOctets = errors.New("Wrong number of octets") )
Functions ¶
func GetJSON ¶
GetJSON makes an HTTP call to the specified URL and parses the returned JSON into `out`.
func ParseIPToUint32 ¶
ParseIPToUint32 converts a string ip (e.g. "x.y.z.w") to an uint32
Types ¶
type AgentClientUDP ¶
AgentClientUDP is a UDP client to Jaeger agent that implements agent.Agent interface.
func NewAgentClientUDP ¶
func NewAgentClientUDP(hostPort string, maxPacketSize int) (*AgentClientUDP, error)
NewAgentClientUDP creates a client that sends spans to Jaeger Agent over UDP.
func (*AgentClientUDP) Close ¶
func (a *AgentClientUDP) Close() error
Close implements Close() of io.Closer and closes the underlying UDP connection.
func (*AgentClientUDP) EmitZipkinBatch ¶
func (a *AgentClientUDP) EmitZipkinBatch(spans []*zipkincore.Span) error
EmitZipkinBatch implements EmitZipkinBatch() of Agent interface
type RateLimiter ¶
RateLimiter is a filter used to check if a message that is worth itemCost units is within the rate limits.
func NewRateLimiter ¶
func NewRateLimiter(creditsPerSecond float64) RateLimiter
NewRateLimiter creates a new rate limiter based on leaky bucket algorithm, formulated in terms of a credits balance that is replenished every time CheckCredit() method is called (tick) by the amount proportional to the time elapsed since the last tick, up to max of creditsPerSecond. A call to CheckCredit() takes a cost of an item we want to pay with the balance. If the balance exceeds the cost of the item, the item is "purchased" and the balance reduced, indicated by returned value of true. Otherwise the balance is unchanged and return false.
This can be used to limit a rate of messages emitted by a service by instantiating the Rate Limiter with the max number of messages a service is allowed to emit per second, and calling CheckCredit(1.0) for each message to determine if the message is within the rate limit.
It can also be used to limit the rate of traffic in bytes, by setting creditsPerSecond to desired throughput as bytes/second, and calling CheckCredit() with the actual message size.