go-waku/mobile/api_relay.go

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package gowaku
import (
"context"
"time"
"sync"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/waku-org/go-waku/waku/v2/protocol"
"github.com/waku-org/go-waku/waku/v2/protocol/pb"
"github.com/waku-org/go-waku/waku/v2/protocol/relay"
)
var relaySubscriptions map[string]*relay.Subscription = make(map[string]*relay.Subscription)
var relaySubsMutex sync.Mutex
func RelayEnoughPeers(topic string) string {
if wakuState.node == nil {
return MakeJSONResponse(errWakuNodeNotReady)
}
topicToCheck := protocol.DefaultPubsubTopic().String()
if topic != "" {
topicToCheck = topic
}
return PrepareJSONResponse(wakuState.node.Relay().EnoughPeersToPublishToTopic(topicToCheck), nil)
}
func relayPublish(msg *pb.WakuMessage, pubsubTopic string, ms int) (string, error) {
if wakuState.node == nil {
return "", errWakuNodeNotReady
}
var ctx context.Context
var cancel context.CancelFunc
if ms > 0 {
ctx, cancel = context.WithTimeout(context.Background(), time.Duration(int(ms))*time.Millisecond)
defer cancel()
} else {
ctx = context.Background()
}
hash, err := wakuState.node.Relay().PublishToTopic(ctx, msg, pubsubTopic)
return hexutil.Encode(hash), err
}
func RelayPublish(messageJSON string, topic string, ms int) string {
msg, err := wakuMessage(messageJSON)
if err != nil {
return MakeJSONResponse(err)
}
hash, err := relayPublish(msg, getTopic(topic), int(ms))
return PrepareJSONResponse(hash, err)
}
func RelayPublishEncodeAsymmetric(messageJSON string, topic string, publicKey string, optionalSigningKey string, ms int) string {
msg, err := wakuMessageAsymmetricEncoding(messageJSON, publicKey, optionalSigningKey)
if err != nil {
return MakeJSONResponse(err)
}
hash, err := relayPublish(msg, getTopic(topic), int(ms))
return PrepareJSONResponse(hash, err)
}
func RelayPublishEncodeSymmetric(messageJSON string, topic string, symmetricKey string, optionalSigningKey string, ms int) string {
msg, err := wakuMessageSymmetricEncoding(messageJSON, symmetricKey, optionalSigningKey)
if err != nil {
return MakeJSONResponse(err)
}
hash, err := relayPublish(msg, getTopic(topic), int(ms))
return PrepareJSONResponse(hash, err)
}
func relaySubscribe(topic string) error {
topicToSubscribe := getTopic(topic)
relaySubsMutex.Lock()
defer relaySubsMutex.Unlock()
_, ok := relaySubscriptions[topicToSubscribe]
if ok {
return nil
}
subscription, err := wakuState.node.Relay().SubscribeToTopic(context.Background(), topicToSubscribe)
if err != nil {
return err
}
relaySubscriptions[topicToSubscribe] = subscription
go func(subscription *relay.Subscription) {
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for envelope := range subscription.Ch {
send("message", toSubscriptionMessage(envelope))
}
}(subscription)
return nil
}
func RelaySubscribe(topic string) string {
if wakuState.node == nil {
return MakeJSONResponse(errWakuNodeNotReady)
}
return MakeJSONResponse(relaySubscribe(topic))
}
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func RelayTopics() string {
if wakuState.node == nil {
return MakeJSONResponse(errWakuNodeNotReady)
}
return PrepareJSONResponse(wakuState.node.Relay().Topics(), nil)
}
func RelayUnsubscribe(topic string) string {
if wakuState.node == nil {
return MakeJSONResponse(errWakuNodeNotReady)
}
topicToUnsubscribe := getTopic(topic)
relaySubsMutex.Lock()
defer relaySubsMutex.Unlock()
subscription, ok := relaySubscriptions[topicToUnsubscribe]
if ok {
return MakeJSONResponse(nil)
}
subscription.Unsubscribe()
delete(relaySubscriptions, topicToUnsubscribe)
err := wakuState.node.Relay().Unsubscribe(context.Background(), topicToUnsubscribe)
if err != nil {
return MakeJSONResponse(err)
}
return MakeJSONResponse(nil)
}