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helpers.go
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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
package stun
// Interfaces that are implemented by message attributes, shorthands for them,
// or helpers for message fields as type or transaction id.
type (
// Setter sets *Message attribute.
Setterinterface {
AddTo(m*Message)error
}
// Getter parses attribute from *Message.
Getterinterface {
GetFrom(m*Message)error
}
// Checker checks *Message attribute.
Checkerinterface {
Check(m*Message)error
}
)
// Build resets message and applies setters to it in batch, returning on
// first error. To prevent allocations, pass pointers to values.
//
// Example:
//
//var (
//t = BindingRequest
//username = NewUsername("username")
//nonce = NewNonce("nonce")
//realm = NewRealm("example.org")
//)
//m := new(Message)
//m.Build(t, username, nonce, realm) // 4 allocations
//m.Build(&t, &username, &nonce, &realm) // 0 allocations
//
// See BenchmarkBuildOverhead.
func (m*Message)Build(setters...Setter)error {
m.Reset()
m.WriteHeader()
for_,s:=rangesetters {
iferr:=s.AddTo(m);err!=nil {
returnerr
}
}
returnnil
}
// Check applies checkers to message in batch, returning on first error.
func (m*Message)Check(checkers...Checker)error {
for_,c:=rangecheckers {
iferr:=c.Check(m);err!=nil {
returnerr
}
}
returnnil
}
// Parse applies getters to message in batch, returning on first error.
func (m*Message)Parse(getters...Getter)error {
for_,c:=rangegetters {
iferr:=c.GetFrom(m);err!=nil {
returnerr
}
}
returnnil
}
// MustBuild wraps Build call and panics on error.
funcMustBuild(setters...Setter)*Message {
m,err:=Build(setters...)
iferr!=nil {
panic(err)//nolint
}
returnm
}
// Build wraps Message.Build method.
funcBuild(setters...Setter) (*Message,error) {
m:=new(Message)
iferr:=m.Build(setters...);err!=nil {
returnnil,err
}
returnm,nil
}
// ForEach is helper that iterates over message attributes allowing to call
// Getter in f callback to get all attributes of type t and returning on first
// f error.
//
// The m.Get method inside f will be returning next attribute on each f call.
// Does not error if there are no results.
func (m*Message)ForEach(tAttrType,ffunc(m*Message)error)error {
attrs:=m.Attributes
deferfunc() {
m.Attributes=attrs
}()
fori,a:=rangeattrs {
ifa.Type!=t {
continue
}
m.Attributes=attrs[i:]
iferr:=f(m);err!=nil {
returnerr
}
}
returnnil
}