package host

import "istio.io/istio/pkg/config/host"

Index ¶

• type Name
• func (n Name) Matches(o Name) bool
• func (n Name) SubsetOf(o Name) bool
• type Names
• func NamesForNamespace(hosts []string, namespace string) Names
• func NewNames(hosts []string) Names
• func (h Names) Contains(host Name) bool
• func (h Names) Intersection(other Names) Names
• func (h Names) Len() int
• func (h Names) Less(i, j int) bool
• func (h Names) Swap(i, j int)

Package Files ¶

name.go names.go

type Name ¶ Uses

type Name string

Name describes a (possibly wildcarded) hostname

func (Name) Matches ¶ Uses

func (n Name) Matches(o Name) bool

Matches returns true if this hostname overlaps with the other hostname. Names overlap if: - they're fully resolved (i.e. not wildcarded) and match exactly (i.e. an exact string match) - one or both are wildcarded (e.g. "*.foo.com"), in which case we use wildcard resolution rules to determine if h is covered by o or o is covered by h. e.g.:

Name("foo.com").Matches("foo.com")   = true
Name("foo.com").Matches("bar.com")   = false
Name("*.com").Matches("foo.com")     = true
Name("bar.com").Matches("*.com")     = true
Name("*.foo.com").Matches("foo.com") = false
Name("*").Matches("foo.com")         = true
Name("*").Matches("*.com")           = true

func (Name) SubsetOf ¶ Uses

func (n Name) SubsetOf(o Name) bool

SubsetOf returns true if this hostname is a valid subset of the other hostname. The semantics are the same as "Matches", but only in one direction (i.e., h is covered by o).

type Names ¶ Uses

type Names []Name

Names is a collection of Name; it exists so it's easy to sort hostnames consistently across Istio. In a few locations we care about the order hostnames appear in Envoy config: primarily HTTP routes, but also in gateways, and for SNI. In those locations, we sort hostnames longest to shortest with wildcards last.

func NamesForNamespace ¶ Uses

func NamesForNamespace(hosts []string, namespace string) Names

NamesForNamespace returns the subset of hosts that are in the specified namespace. The list of hosts contains host names optionally qualified with namespace/ or */. If not qualified or qualified with *, the host name is considered to be in every namespace. e.g.: NamesForNamespace(["ns1/foo.com","ns2/bar.com"], "ns1") = Names(["foo.com"]) NamesForNamespace(["ns1/foo.com","ns2/bar.com"], "ns3") = Names([]) NamesForNamespace(["ns1/foo.com","*/bar.com"], "ns1") = Names(["foo.com","bar.com"]) NamesForNamespace(["ns1/foo.com","*/bar.com"], "ns3") = Names(["bar.com"]) NamesForNamespace(["foo.com","ns2/bar.com"], "ns2") = Names(["foo.com","bar.com"]) NamesForNamespace(["foo.com","ns2/bar.com"], "ns3") = Names(["foo.com"])

func NewNames ¶ Uses

func NewNames(hosts []string) Names

NewNames converts a slice of host name strings to type Names.

func (Names) Contains ¶ Uses

func (h Names) Contains(host Name) bool

func (Names) Intersection ¶ Uses

func (h Names) Intersection(other Names) Names

Intersection returns the subset of host names that are covered by both h and other. e.g.:

Names(["foo.com","bar.com"]).Intersection(Names(["*.com"]))         = Names(["foo.com","bar.com"])
Names(["foo.com","*.net"]).Intersection(Names(["*.com","bar.net"])) = Names(["foo.com","bar.net"])
Names(["foo.com","*.net"]).Intersection(Names(["*.bar.net"]))       = Names(["*.bar.net"])
Names(["foo.com"]).Intersection(Names(["bar.com"]))                 = Names([])
Names([]).Intersection(Names(["bar.com"])                           = Names([])

func (Names) Len ¶ Uses

func (h Names) Len() int

func (Names) Less ¶ Uses

func (h Names) Less(i, j int) bool

func (Names) Swap ¶ Uses

func (h Names) Swap(i, j int)