network

Documentation

Index

• Constants
• Variables
• type Client
  • func NewClient(client sync.Client, runenv *runtime.RunEnv) *Client
  • func (c *Client) ConfigureNetwork(ctx context.Context, config *Config) (err error)
  • func (c *Client) GetDataNetworkIP() (net.IP, error)
  • func (c *Client) MustConfigureNetwork(ctx context.Context, config *Config)
  • func (c *Client) MustGetDataNetworkIP() net.IP
  • func (c *Client) MustWaitNetworkInitialized(ctx context.Context)
  • func (c *Client) WaitNetworkInitialized(ctx context.Context) error
• type Config
• type FilterAction
• type LinkRule
• type LinkShape
• type RoutingPolicyType

Constants

const (
	// magic values that we monitor on the Testground runner side to detect when Testground
	// testplan instances are initialised and at the stage of actually running a test
	// check cluster_k8s.go for more information
	InitialisationSuccessful = "network initialisation successful"
	InitialisationFailed     = "network initialisation failed"
)

const (
	AllowAll = RoutingPolicyType("allow_all")
	DenyAll  = RoutingPolicyType("deny_all")
)

const (
	// The `data` network that Testground currently configures. In the future we might want to have
	// multiple `data` networks, and shape the network traffic on them differently.
	DefaultDataNetwork = "default"
)

Variables

var ErrNoTrafficShaping = fmt.Errorf("no traffic shaping available with this runner")

ErrNoTrafficShaping is returned from functions in this package when traffic shaping is not available, such as when using the local:exec runner.

Types

type Client

type Client struct {
	// contains filtered or unexported fields
}

func NewClient

func NewClient(client sync.Client, runenv *runtime.RunEnv) *Client

NewClient returns a new network client. Use this client to request network changes, such as setting latencies, jitter, packet loss, connectedness, etc.

func (*Client) ConfigureNetwork

func (c *Client) ConfigureNetwork(ctx context.Context, config *Config) (err error)

ConfigureNetwork asks the sidecar to configure the network, and returns either when the sidecar signals back to us, or when the context expires.

func (*Client) GetDataNetworkIP

func (c *Client) GetDataNetworkIP() (net.IP, error)

GetDataNetworkIP examines the local network interfaces, and tries to find our assigned IP within the data network.

This function returns the IP and a nil error if found. If running in a sidecar-less environment, the error ErrNoTrafficShaping is returned.

func (*Client) MustConfigureNetwork

func (c *Client) MustConfigureNetwork(ctx context.Context, config *Config)

MustConfigureNetwork calls ConfigureNetwork, and panics if it errors. It is suitable to use with runner.Invoke/InvokeMap, as long as this method is called from the main goroutine of the test plan.

func (*Client) MustGetDataNetworkIP

func (c *Client) MustGetDataNetworkIP() net.IP

MustGetDataNetworkIP calls GetDataNetworkIP, and panics if it errors. It is suitable to use with runner.Invoke/InvokeMap, as long as this method is called from the main goroutine of the test plan.

func (*Client) MustWaitNetworkInitialized

func (c *Client) MustWaitNetworkInitialized(ctx context.Context)

MustWaitNetworkInitialized calls WaitNetworkInitialized, and panics if it errors. It is suitable to use with runner.Invoke/InvokeMap, as long as this method is called from the main goroutine of the test plan.

func (*Client) WaitNetworkInitialized

func (c *Client) WaitNetworkInitialized(ctx context.Context) error

WaitNetworkInitialized waits for the sidecar to initialize the network, if the sidecar is enabled. If not, it returns immediately.

type Config

type Config struct {
	// Network is the name of the network to configure
	Network string

	// IPv4 and IPv6 set the IP addresses of this network device. If
	// unspecified, the sidecar will leave them alone.
	//
	// Your test-case will be assigned a B block in the range
	// 16.0.0.1-32.0.0.0. X.Y.0.1 will always be reserved for the gateway
	// and shouldn't be used by the test.
	//
	// TODO: IPv6 is currently not supported.
	IPv4, IPv6 *net.IPNet

	// Enable enables this network device.
	Enable bool

	// Default is the default link shaping rule.
	Default LinkShape

	// Rules defines how traffic should be shaped to different subnets.
	//
	// TODO: This is not implemented.
	Rules []LinkRule

	// CallbackState will be signalled when the link changes are applied.
	//
	// Nodes can use the same state to wait for _all_ or a subset of nodes to
	// enter the desired network state. See CallbackTarget.
	CallbackState sync.State `json:"State"`

	// CallbackTarget is the amount of instances that will have needed to signal
	// on the Callback state to consider the configuration operation a success.
	//
	// A zero value falls back to runenv.TestInstanceCount (i.e. all instances
	// participating in the test run).
	CallbackTarget int `json:"-"`

	// RoutingPolicy defines the data routing policy of a certain node. This affects
	// external networks other than the network 'Default', e.g., external Internet
	// access.
	RoutingPolicy RoutingPolicyType
}

NetworkConfig specifies how a node's network should be configured.

type FilterAction

type FilterAction int

const (
	Accept FilterAction = iota
	Reject
	Drop
)

type LinkRule

type LinkRule struct {
	LinkShape
	Subnet net.IPNet
}

LinkRule applies a LinkShape to a subnet.

type LinkShape

type LinkShape struct {
	// Latency is the egress latency
	Latency time.Duration

	// Jitter is the egress jitter
	Jitter time.Duration

	// Bandwidth is egress bytes per second
	Bandwidth uint64

	// Drop all inbound traffic.
	// TODO: Not implemented
	Filter FilterAction

	// Loss is the egress packet loss (%)
	Loss float32

	// Corrupt is the egress packet corruption probability (%)
	Corrupt float32

	// Corrupt is the egress packet corruption correlation (%)
	CorruptCorr float32

	// Reorder is the probability that an egress packet will be reordered (%)
	//
	// Reordered packets will skip the latency delay and be sent
	// immediately. You must specify a non-zero Latency for this option to
	// make sense.
	Reorder float32

	// ReorderCorr is the egress packet reordering correlation (%)
	ReorderCorr float32

	// Duplicate is the percentage of packets that are duplicated (%)
	Duplicate float32

	// DuplicateCorr is the correlation between egress packet duplication (%)
	DuplicateCorr float32
}

LinkShape defines how traffic should be shaped.

type RoutingPolicyType

type RoutingPolicyType string

RoutingPolicyType defines a certain routing policy to a network.