Docker Libnetwork driver API

wuliuwang

　　以下内容均在libnetwork/driverapi目录下
　　Driver接口如下所示：



// Driver is an interface that every plugin driver needs to implement.
type Driver interface {
　　discoverapi.Discover
　　// NetworkAllocate invokes the driver method to allocate network
　　// specific resources passing network id and network specific config.
　　// It returns a key, value pair of network specific driver allocations
　　// to the caller.
　　NetworkAllocate(nid string, options map[string]string, ipV4Data, ipV6Data []IPAMData) (map[string]string, error)
　　// NetworkFree invokes the driver method to free network specific resources
　　// associated with a given network id.
　　NetworkFree(nid string) error

　　// CreateNetwork invokes the driver method to create a network
　　// passing the network id and network specific config. The
　　// config mechanism will eventually be replaced with labels
　　// which are yet to be introduced. The driver can return a
　　// list of table names for which it is interested in receiving
　　// notification when a CRUD operation is performed on any
　　// entry in that table. This will be ignored for local scope drivers.
　　CreateNetwork(nid string, options map[string]interface{}, nInfo NetworkInfo, ipV4Data, ipV6Data []IPAMData) error

　　// DeleteNetwork invokes the driver method to delete network passing
　　// the network id.
　　DeleteNetwork(nid string) error
　　// CreateEndpoint invokes the driver method to create an endpoint
　　// passing the network id, endpoint id endpoint information and driver
　　// specific config. The endpoint information can be either consumed by
　　// the driver or populated by the driver. The config mechanism will
　　// eventually be replaced with labels which are yet to be introducd.
　　CreateEndpoint(nid, eid string, ifInfo InterfaceInfo, options map[string]interface{}) error
　　// DeleteEndpoint invokes the driver method to delete an endpoint
　　// passing the network id and endpoint id.
　　DeleteEndpoint(nid, eid string) error
　　// EndpointOperInfo retrieves from the driver the operational data related to the specific endpoint
　　EndpointOperInfo(nid, eid string) (map[string]interface{}, error)
　　// Join method is invoked when a Sandbox is attached to an endpoint.
　　Join(nid, eid string, sboxKey string, jinfo JoinInfo, options map[string]interface{}) error
　　// Leave method is invoked when a Sandbox detaches from an endpoint.
　　Leave(nid, eid string) error
　　// ProgramExternalConnectivity invokes the driver method which does the necessary
　　// programming to allow the external connectivity dictated by the passed options.
　　ProgramExternalConnectivity(nid, eid string, options map[string]interface{}) error
　　// RevokeExternalConnectivity asks the driver to remove any external connectivity
　　// programming that was done so far
　　RevokeExternalConnectivity(nid, eid string) error
　　// EventNotify notifies the driver when a CRUD operation has
　　// happended on a table of its interest as soon as this node
　　// receives such an event in the gossip layer. This method is
　　// only invoked for the global scope driver.
　　EventNotify(event EventType, nid string, tableName string, key string, value []byte)
　　// Type returns the type of this driver, the network type this driver manages.
　　Type() string
　　// IsBuiltIn returns true if it is a built-in driver
　　IsBuiltIn() bool
}

　　NetworkInfo接口如下所示：



// NetworkInfo provides a go interface for drivers to provide network
// specific information on libnetwork.
type NetworkInfo interface {
　　// TableEventRegister registers driver interest in a given
　　// table name.
　　TableEventRegister(tableName string) error
}

　　InterfaceInfo接口如下所示：



// InterfaceInfo provides a go interface for drivers to retrive
// network information to interface resources.
type InterfaceInfo interface {
　　// SetMacAddress allows the driver to set the mac address to the endpoint interface
　　// during the call to CreateEndpoint, if the mac address is not already set.
　　SetMacAddress(mac net.HardwareAddr) error
　　// SetIPAddress allows the driver to set the ip address to the endpoint interface
　　// during the call to CreateEndpoint, if the address is not already set.
　　// The API is to be used to assign both the IPv4 and IPv6 address types.
　　SetIPAddress(ip *net.IPNet) error
　　// MacAddress returns the MAC address.
　　MacAddress() net.HardwareAddr
　　// Address returns the IPv4 address.
　　Address() *net.IPNet
　　// AddressIPv6 returns the IPv4 address.
　　AddressIPv6() *net.IPNet
}

　　InterfaceNameInfo接口如下所示：



// InterfaceNameInfo provides a go interface for the drivers to assign names
// to interfaces
type InterfaceNameInfo interface {
　　// SetNames method assigns the srcName and dstPrefix for the interface.
　　SetNames(srcName, dstPrefix string) error
}

　　JoinInfo接口如下所示：



// JoinInfo represents a set of resources that the driver has the ability to provide during
// join time.
type JoinInfo interface {
　　// InterfaceName returns an InterfaceNameInfo go interface to facilitate
　　// setting the names for the interface.
　　InterfaceName() InterfaceNameInfo
　　// SetGateway sets the default IPv4 gateway when a container joins the endpoint.
　　SetGateway(net.IP) error
　　// SetGatewayIPv6 sets the default IPv6 gateway when a container joins the endpoint
　　SetGateway(net.IP) error
　　// AddStaticRoute adds a route to the sandbox.
　　// It may be used in addition to or instead of a default gateway (as above)
　　AddStaticRoute(destination *net.IPNet, routeType int, nextHop net.IP) error
　　// DisableGatewayService tells libnetwork not to provide Default GW for the container
　　DisableGatewayService()
　　// AddTableEntry adds a table entry to the gossip layer
　　// passing the table name, key and an opaque value.
　　AddTableEntry(tableName string, key string, value []byte) error
}

　　IPAMData结构如下所示



// IPAMData represents the per-network ip related
// operational information libnetwork will send
// to the network driver during CreateNetwork()
type IPAMData struct {
　　AddressSpace 　　string
　　Pool　　　　　　　 *net.IPNet
　　Gateway　　　　　*net.IPNet
　　AuxAddresses　　 map[string]*net.IPNet
}

　　DriverCallback数据结构如下所示



// DriverCallback provides a Callback interface for Drivers into LibNetwork
type DriverCallback interface{
　　// GetPluginGetter returns the pluginv2 getter.
　　GetPluginGetter() plugingetter.PluginGetter
　　// RegisterDriver provides a way for remote drivers to dynamically register new NetworkType and associate with a driver instance
　　RegisterDriver(name string, driver Driver, capability Capability) error
}