proxy

package
Version: v3.4.7+incompatible Latest Latest
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Published: Mar 18, 2020 License: Apache-2.0 Imports: 13 Imported by: 0

Documentation

Overview

Package proxy implements proxy servers for network fault testing.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Server

type Server interface {
	// From returns proxy source address in "scheme://host:port" format.
	From() string
	// To returns proxy destination address in "scheme://host:port" format.
	To() string

	// Ready returns when proxy is ready to serve.
	Ready() <-chan struct{}
	// Done returns when proxy has been closed.
	Done() <-chan struct{}
	// Error sends errors while serving proxy.
	Error() <-chan error
	// Close closes listener and transport.
	Close() error

	// PauseAccept stops accepting new connections.
	PauseAccept()
	// UnpauseAccept removes pause operation on accepting new connections.
	UnpauseAccept()

	// DelayAccept adds latency ± random variable to accepting
	// new incoming connections.
	DelayAccept(latency, rv time.Duration)
	// UndelayAccept removes sending latencies.
	UndelayAccept()
	// LatencyAccept returns current latency on accepting
	// new incoming connections.
	LatencyAccept() time.Duration

	// DelayTx adds latency ± random variable for "outgoing" traffic
	// in "sending" layer.
	DelayTx(latency, rv time.Duration)
	// UndelayTx removes sending latencies.
	UndelayTx()
	// LatencyTx returns current send latency.
	LatencyTx() time.Duration

	// DelayRx adds latency ± random variable for "incoming" traffic
	// in "receiving" layer.
	DelayRx(latency, rv time.Duration)
	// UndelayRx removes "receiving" latencies.
	UndelayRx()
	// LatencyRx returns current receive latency.
	LatencyRx() time.Duration

	// ModifyTx alters/corrupts/drops "outgoing" packets from the listener
	// with the given edit function.
	ModifyTx(f func(data []byte) []byte)
	// UnmodifyTx removes modify operation on "forwarding".
	UnmodifyTx()

	// ModifyRx alters/corrupts/drops "incoming" packets to client
	// with the given edit function.
	ModifyRx(f func(data []byte) []byte)
	// UnmodifyRx removes modify operation on "receiving".
	UnmodifyRx()

	// BlackholeTx drops all "outgoing" packets before "forwarding".
	// "BlackholeTx" operation is a wrapper around "ModifyTx" with
	// a function that returns empty bytes.
	BlackholeTx()
	// UnblackholeTx removes blackhole operation on "sending".
	UnblackholeTx()

	// BlackholeRx drops all "incoming" packets to client.
	// "BlackholeRx" operation is a wrapper around "ModifyRx" with
	// a function that returns empty bytes.
	BlackholeRx()
	// UnblackholeRx removes blackhole operation on "receiving".
	UnblackholeRx()

	// PauseTx stops "forwarding" packets; "outgoing" traffic blocks.
	PauseTx()
	// UnpauseTx removes "forwarding" pause operation.
	UnpauseTx()

	// PauseRx stops "receiving" packets; "incoming" traffic blocks.
	PauseRx()
	// UnpauseRx removes "receiving" pause operation.
	UnpauseRx()

	// ResetListener closes and restarts listener.
	ResetListener() error
}

Server defines proxy server layer that simulates common network faults: latency spikes and packet drop or corruption. The proxy overhead is very small overhead (<500μs per request). Please run tests to compute actual overhead.

func NewServer

func NewServer(cfg ServerConfig) Server

NewServer returns a proxy implementation with no iptables/tc dependencies. The proxy layer overhead is <1ms.

type ServerConfig

type ServerConfig struct {
	Logger        *zap.Logger
	From          url.URL
	To            url.URL
	TLSInfo       transport.TLSInfo
	DialTimeout   time.Duration
	BufferSize    int
	RetryInterval time.Duration
}

ServerConfig defines proxy server configuration.

Source Files

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