直播：后台 JWT 推流、前台画中画；WebRTC 服务与 Nginx WebSocket 代理

Made-with: Cursor

server/vendor/github.com/pion/ice/v2/candidate_relay.go

@@ -0,0 +1,115 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package ice
+
+import (
+	"net"
+)
+
+// CandidateRelay ...
+type CandidateRelay struct {
+	candidateBase
+
+	relayProtocol string
+	onClose       func() error
+}
+
+// CandidateRelayConfig is the config required to create a new CandidateRelay
+type CandidateRelayConfig struct {
+	CandidateID   string
+	Network       string
+	Address       string
+	Port          int
+	Component     uint16
+	Priority      uint32
+	Foundation    string
+	RelAddr       string
+	RelPort       int
+	RelayProtocol string
+	OnClose       func() error
+}
+
+// NewCandidateRelay creates a new relay candidate
+func NewCandidateRelay(config *CandidateRelayConfig) (*CandidateRelay, error) {
+	candidateID := config.CandidateID
+
+	if candidateID == "" {
+		candidateID = globalCandidateIDGenerator.Generate()
+	}
+
+	ip := net.ParseIP(config.Address)
+	if ip == nil {
+		return nil, ErrAddressParseFailed
+	}
+
+	networkType, err := determineNetworkType(config.Network, ip)
+	if err != nil {
+		return nil, err
+	}
+
+	return &CandidateRelay{
+		candidateBase: candidateBase{
+			id:                 candidateID,
+			networkType:        networkType,
+			candidateType:      CandidateTypeRelay,
+			address:            config.Address,
+			port:               config.Port,
+			resolvedAddr:       &net.UDPAddr{IP: ip, Port: config.Port},
+			component:          config.Component,
+			foundationOverride: config.Foundation,
+			priorityOverride:   config.Priority,
+			relatedAddress: &CandidateRelatedAddress{
+				Address: config.RelAddr,
+				Port:    config.RelPort,
+			},
+			remoteCandidateCaches: map[AddrPort]Candidate{},
+		},
+		relayProtocol: config.RelayProtocol,
+		onClose:       config.OnClose,
+	}, nil
+}
+
+// LocalPreference returns the local preference for this candidate
+func (c *CandidateRelay) LocalPreference() uint16 {
+	// These preference values come from libwebrtc
+	// https://github.com/mozilla/libwebrtc/blob/1389c76d9c79839a2ca069df1db48aa3f2e6a1ac/p2p/base/turn_port.cc#L61
+	var relayPreference uint16
+	switch c.relayProtocol {
+	case relayProtocolTLS, relayProtocolDTLS:
+		relayPreference = 2
+	case tcp:
+		relayPreference = 1
+	default:
+		relayPreference = 0
+	}
+
+	return c.candidateBase.LocalPreference() + relayPreference
+}
+
+// RelayProtocol returns the protocol used between the endpoint and the relay server.
+func (c *CandidateRelay) RelayProtocol() string {
+	return c.relayProtocol
+}
+
+func (c *CandidateRelay) close() error {
+	err := c.candidateBase.close()
+	if c.onClose != nil {
+		err = c.onClose()
+		c.onClose = nil
+	}
+	return err
+}
+
+func (c *CandidateRelay) copy() (Candidate, error) {
+	cc, err := c.candidateBase.copy()
+	if err != nil {
+		return nil, err
+	}
+
+	if ccr, ok := cc.(*CandidateRelay); ok {
+		ccr.relayProtocol = c.relayProtocol
+	}
+
+	return cc, nil
+}