plugins

Documentation

Index

• func FilterStageComparison(a, b FilterStage) int
• func StagedFilterListContainsName(filters StagedHttpFilterList, filterName string) bool
• type EndpointPlugin
• type FilterStage
  • func AfterStage(wellKnown WellKnownFilterStage) FilterStage
  • func BeforeStage(wellKnown WellKnownFilterStage) FilterStage
  • func DuringStage(wellKnown WellKnownFilterStage) FilterStage
  • func RelativeToStage(wellKnown WellKnownFilterStage, weight int) FilterStage
• type HttpFilterPlugin
• type InitParams
• type ListenerPlugin
• type Params
• type Plugin
• type PluginRegistry
• type ResourceGeneratorPlugin
• type RouteActionParams
• type RouteActionPlugin
• type RouteParams
• type RoutePlugin
• type StagedHttpFilter
  • func NewStagedFilter(name string, stage FilterStage) StagedHttpFilter
  • func NewStagedFilterWithConfig(name string, config proto.Message, stage FilterStage) (StagedHttpFilter, error)
• type StagedHttpFilterList
  • func (s StagedHttpFilterList) Len() int
  • func (s StagedHttpFilterList) Less(i, j int) bool
  • func (s StagedHttpFilterList) Swap(i, j int)
• type StagedNetworkFilter
• type StagedNetworkFilterList
  • func (s StagedNetworkFilterList) Len() int
  • func (s StagedNetworkFilterList) Less(i, j int) bool
  • func (s StagedNetworkFilterList) Swap(i, j int)
• type TcpFilterChainPlugin
• type Upgradable
• type UpstreamPlugin
• type VirtualHostParams
• type VirtualHostPlugin
• type WeightedDestinationPlugin
• type WellKnownFilterStage

Functions

func FilterStageComparison

func FilterStageComparison(a, b FilterStage) int

FilterStageComparison helps implement the sort.Interface Less function for use in other implementations of sort.Interface returns -1 if less than, 0 if equal, 1 if greater than It is not sufficient to return a Less bool because calling functions need to know if equal or greater when Less is false

func StagedFilterListContainsName

func StagedFilterListContainsName(filters StagedHttpFilterList, filterName string) bool

Types

type EndpointPlugin

type EndpointPlugin interface {
	Plugin
	ProcessEndpoints(params Params, in *v1.Upstream, out *envoy_config_endpoint_v3.ClusterLoadAssignment) error
}

Endpoint is called after the envoy ClusterLoadAssignment has been created for the input Upstream, and allows the endpoints to be edited before being sent to envoy via EDS If one wishes to also modify the corresponding envoy Cluster the above UpstreamPlugin interface should be used.

type FilterStage

type FilterStage struct {
	RelativeTo WellKnownFilterStage
	Weight     int
}

func AfterStage

func AfterStage(wellKnown WellKnownFilterStage) FilterStage

func BeforeStage

func BeforeStage(wellKnown WellKnownFilterStage) FilterStage

func DuringStage

func DuringStage(wellKnown WellKnownFilterStage) FilterStage

func RelativeToStage

func RelativeToStage(wellKnown WellKnownFilterStage, weight int) FilterStage

type HttpFilterPlugin

type HttpFilterPlugin interface {
	Plugin
	HttpFilters(params Params, listener *v1.HttpListener) ([]StagedHttpFilter, error)
}

type InitParams

type InitParams struct {
	Ctx      context.Context
	Settings *v1.Settings
}

type ListenerPlugin

type ListenerPlugin interface {
	Plugin
	ProcessListener(params Params, in *v1.Listener, out *envoy_config_listener_v3.Listener) error
}

type Params

type Params struct {
	Ctx      context.Context
	Snapshot *v1.ApiSnapshot
}

type Plugin

type Plugin interface {
	Init(params InitParams) error
}

type PluginRegistry

type PluginRegistry interface {
	GetPlugins() []Plugin
	GetListenerPlugins() []ListenerPlugin
	GetTcpFilterChainPlugins() []TcpFilterChainPlugin
	GetHttpFilterPlugins() []HttpFilterPlugin
}

A PluginRegistry is used to provide Plugins to relevant translators Historically, all plugins were passed around as an argument, and each translator would iterate over all plugins, and only apply the relevant ones. This interface enables translators to only know of the relevant plugins NOTE:

This is not complete. As translators are modified, we can gradually expose
more methods on a PluginRegistry

type ResourceGeneratorPlugin

type ResourceGeneratorPlugin interface {
	Plugin
	GeneratedResources(params Params,
		inClusters []*envoy_config_cluster_v3.Cluster,
		inEndpoints []*envoy_config_endpoint_v3.ClusterLoadAssignment,
		inRouteConfigurations []*envoy_config_route_v3.RouteConfiguration,
		inListeners []*envoy_config_listener_v3.Listener,
	) ([]*envoy_config_cluster_v3.Cluster, []*envoy_config_endpoint_v3.ClusterLoadAssignment, []*envoy_config_route_v3.RouteConfiguration, []*envoy_config_listener_v3.Listener, error)
}

Generation plugins

type RouteActionParams

type RouteActionParams struct {
	RouteParams
	Route *v1.Route
}

type RouteActionPlugin

type RouteActionPlugin interface {
	Plugin
	ProcessRouteAction(params RouteActionParams, inAction *v1.RouteAction, out *envoy_config_route_v3.RouteAction) error
}

note: any route action plugin can be implemented as a route plugin suggestion: if your plugin requires configuration from a RoutePlugin field, implement the RoutePlugin interface

type RouteParams

type RouteParams struct {
	VirtualHostParams
	VirtualHost *v1.VirtualHost
}

type RoutePlugin

type RoutePlugin interface {
	Plugin
	ProcessRoute(params RouteParams, in *v1.Route, out *envoy_config_route_v3.Route) error
}

type StagedHttpFilter

type StagedHttpFilter struct {
	HttpFilter *envoyhttp.HttpFilter
	Stage      FilterStage
}

func NewStagedFilter

func NewStagedFilter(name string, stage FilterStage) StagedHttpFilter

func NewStagedFilterWithConfig

func NewStagedFilterWithConfig(name string, config proto.Message, stage FilterStage) (StagedHttpFilter, error)

type StagedHttpFilterList

type StagedHttpFilterList []StagedHttpFilter

func (StagedHttpFilterList) Len

func (s StagedHttpFilterList) Len() int

func (StagedHttpFilterList) Less

func (s StagedHttpFilterList) Less(i, j int) bool

filters by Relative Stage, Weighting, Name, Config Type-Url, Config Value, and (to ensure stability) index. The assumption is that if two filters are in the same stage, their order doesn't matter, and we just need to make sure it is stable.

func (StagedHttpFilterList) Swap

func (s StagedHttpFilterList) Swap(i, j int)

type StagedNetworkFilter

type StagedNetworkFilter struct {
	NetworkFilter *envoy_config_listener_v3.Filter
	Stage         FilterStage
}

type StagedNetworkFilterList

type StagedNetworkFilterList []StagedNetworkFilter

func (StagedNetworkFilterList) Len

func (s StagedNetworkFilterList) Len() int

func (StagedNetworkFilterList) Less

func (s StagedNetworkFilterList) Less(i, j int) bool

filters by Relative Stage, Weighting, Name, and (to ensure stability) index

func (StagedNetworkFilterList) Swap

func (s StagedNetworkFilterList) Swap(i, j int)

type TcpFilterChainPlugin

type TcpFilterChainPlugin interface {
	Plugin
	CreateTcpFilterChains(params Params, in *v1.TcpListener) ([]*envoy_config_listener_v3.FilterChain, error)
}

type Upgradable

type Upgradable interface {
	PluginName() string
	IsUpgrade() bool
}

Upgradable plugins are those which can be replaced by another version with enhanced functionality. Identified by PluginName().

type UpstreamPlugin

type UpstreamPlugin interface {
	Plugin
	ProcessUpstream(params Params, in *v1.Upstream, out *envoy_config_cluster_v3.Cluster) error
}

UpstreamPlugin is called after the envoy Cluster has been created for the input Upstream, and allows the cluster to be edited before being sent to envoy via CDS

type VirtualHostParams

type VirtualHostParams struct {
	Params
	Proxy    *v1.Proxy
	Listener *v1.Listener
}

type VirtualHostPlugin

type VirtualHostPlugin interface {
	Plugin
	ProcessVirtualHost(params VirtualHostParams, in *v1.VirtualHost, out *envoy_config_route_v3.VirtualHost) error
}

type WeightedDestinationPlugin

type WeightedDestinationPlugin interface {
	Plugin
	ProcessWeightedDestination(
		params RouteParams,
		in *v1.WeightedDestination,
		out *envoy_config_route_v3.WeightedCluster_ClusterWeight,
	) error
}

type WellKnownFilterStage

type WellKnownFilterStage int

WellKnownFilterStages are represented by an integer that reflects their relative ordering

const (
	FaultStage     WellKnownFilterStage = iota // Fault injection // First Filter Stage
	CorsStage                                  // Cors stage
	WafStage                                   // Web application firewall stage
	AuthNStage                                 // Authentication stage
	AuthZStage                                 // Authorization stage
	RateLimitStage                             // Rate limiting stage
	AcceptedStage                              // Request passed all the checks and will be forwarded upstream
	OutAuthStage                               // Add auth for the upstream (i.e. aws λ)
	RouteStage                                 // Request is going to upstream // Last Filter Stage
)

If new well known filter stages are added, they should be inserted in a position corresponding to their order