Moves OnlineChecker to a singleton class with cache.

app/src/main/java/com/vitorpamplona/amethyst/service/OnlineCheck.kt

@@ -0,0 +1,40 @@
+package com.vitorpamplona.amethyst.service
+
+import android.util.Log
+import android.util.LruCache
+import com.google.errorprone.annotations.Immutable
+import com.vitorpamplona.amethyst.BuildConfig
+import okhttp3.Request
+
+@Immutable
+data class OnlineCheckResult(val timeInMs: Long, val online: Boolean)
+
+object OnlineChecker {
+    val checkOnlineCache = LruCache<String, OnlineCheckResult>(10)
+    val fiveMinutes = 1000 * 60 * 5
+
+    fun isOnline(url: String?): Boolean {
+        checkNotInMainThread()
+
+        if (url.isNullOrBlank()) return false
+        if ((checkOnlineCache.get(url)?.timeInMs ?: 0) > System.currentTimeMillis() - fiveMinutes) {
+            return checkOnlineCache.get(url).online
+        }
+
+        val request = Request.Builder()
+            .header("User-Agent", "Amethyst/${BuildConfig.VERSION_NAME}")
+            .url(url)
+            .get()
+            .build()
+
+        return try {
+            val result = HttpClient.getHttpClient().newCall(request).execute().code == 200
+            checkOnlineCache.put(url, OnlineCheckResult(System.currentTimeMillis(), result))
+            result
+        } catch (e: Exception) {
+            checkOnlineCache.put(url, OnlineCheckResult(System.currentTimeMillis(), false))
+            Log.e("LiveActivities", "Failed to check streaming url $url", e)
+            false
+        }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/HomeLiveActivitiesFeedFilter.kt

@@ -1,14 +1,11 @@
 package com.vitorpamplona.amethyst.ui.dal
 
-import android.util.Log
-import com.vitorpamplona.amethyst.BuildConfig
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
-import com.vitorpamplona.amethyst.service.HttpClient
+import com.vitorpamplona.amethyst.service.OnlineChecker
 import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
-import okhttp3.Request
 import java.util.Date
 
 class HomeLiveActivitiesFeedFilter(val account: Account) : AdditiveFeedFilter<Note>() {
@@ -41,7 +38,7 @@ class HomeLiveActivitiesFeedFilter(val account: Account) : AdditiveFeedFilter<No
             .asSequence()
             .filter { it ->
                 val noteEvent = it.event
-                (noteEvent is LiveActivitiesEvent && noteEvent.createdAt > twoHrs && noteEvent.status() == "live" && checkIfOnline(noteEvent.streaming())) &&
+                (noteEvent is LiveActivitiesEvent && noteEvent.createdAt > twoHrs && noteEvent.status() == "live" && OnlineChecker.isOnline(noteEvent.streaming())) &&
                     (it.author?.pubkeyHex in followingKeySet || (noteEvent.isTaggedHashes(followingTagSet))) &&
                     // && account.isAcceptable(it)  // This filter follows only. No need to check if acceptable
                     it.author?.let { !account.isHidden(it.pubkeyHex) } ?: true
@@ -55,20 +52,3 @@ class HomeLiveActivitiesFeedFilter(val account: Account) : AdditiveFeedFilter<No
         return collection.sortedWith(compareBy({ it.createdAt() }, { it.idHex })).reversed()
     }
 }
-
-fun checkIfOnline(url: String?): Boolean {
-    if (url.isNullOrBlank()) return false
-
-    val request = Request.Builder()
-        .header("User-Agent", "Amethyst/${BuildConfig.VERSION_NAME}")
-        .url(url)
-        .get()
-        .build()
-
-    return try {
-        HttpClient.getHttpClient().newCall(request).execute().code == 200
-    } catch (e: Exception) {
-        Log.e("LiveActivities", "Failed to check streaming url $url", e)
-        false
-    }
-}

app/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -3,6 +3,7 @@ package com.vitorpamplona.amethyst.ui.note
 import android.content.Intent
 import android.graphics.Bitmap
 import android.util.Log
+import androidx.compose.animation.Crossfade
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
@@ -92,6 +93,7 @@ import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.model.UserMetadata
+import com.vitorpamplona.amethyst.service.OnlineChecker
 import com.vitorpamplona.amethyst.service.model.AppDefinitionEvent
 import com.vitorpamplona.amethyst.service.model.AudioTrackEvent
 import com.vitorpamplona.amethyst.service.model.BadgeAwardEvent
@@ -143,7 +145,9 @@ import com.vitorpamplona.amethyst.ui.components.imageExtensions
 import com.vitorpamplona.amethyst.ui.screen.equalImmutableLists
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChannelHeader
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.LiveFlag
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ReportNoteDialog
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.ScheduledFlag
 import com.vitorpamplona.amethyst.ui.theme.BitcoinOrange
 import com.vitorpamplona.amethyst.ui.theme.DiviserThickness
 import com.vitorpamplona.amethyst.ui.theme.DoubleHorzSpacer
@@ -2611,64 +2615,110 @@ fun AudioTrackHeader(noteEvent: AudioTrackEvent, accountViewModel: AccountViewMo
 
 @Composable
 fun RenderLiveActivityEvent(baseNote: Note, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    Row(modifier = Modifier.padding(top = 5.dp)) {
+        Column(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalAlignment = Alignment.CenterHorizontally
+        ) {
+            RenderLiveActivityEventInner(baseNote = baseNote, accountViewModel, nav)
+        }
+    }
+}
+
+@Composable
+fun RenderLiveActivityEventInner(baseNote: Note, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
     val noteEvent = baseNote.event as? LiveActivitiesEvent ?: return
 
-    val media = remember { noteEvent.streaming() }
+    val eventUpdates by baseNote.live().metadata.observeAsState()
-    val cover = remember { noteEvent.image() }
-    val subject = remember { noteEvent.title() }
-    val content = remember { noteEvent.summary() }
-    val participants = remember { noteEvent.participants() }
 
-    var participantUsers by remember { mutableStateOf<List<Pair<Participant, User>>>(emptyList()) }
+    val media = remember(eventUpdates) { noteEvent.streaming() }
+    val cover = remember(eventUpdates) { noteEvent.image() }
+    val subject = remember(eventUpdates) { noteEvent.title() }
+    val content = remember(eventUpdates) { noteEvent.summary() }
+    val participants = remember(eventUpdates) { noteEvent.participants() }
+    val status = remember(eventUpdates) { noteEvent.status() }
 
-    LaunchedEffect(key1 = participants) {
+    var isOnline by remember { mutableStateOf(false) }
+
+    LaunchedEffect(key1 = media) {
         launch(Dispatchers.IO) {
-            participantUsers = participants.mapNotNull { part ->
+            isOnline = OnlineChecker.isOnline(media)
-                LocalCache.checkGetOrCreateUser(part.key)?.let { Pair(part, it) }
+        }
+    }
+
+    Row(
+        verticalAlignment = CenterVertically,
+        modifier = Modifier
+            .padding(vertical = 5.dp)
+            .fillMaxWidth()
+    ) {
+        subject?.let {
+            Text(
+                text = it,
+                fontWeight = FontWeight.Bold,
+                maxLines = 3,
+                overflow = TextOverflow.Ellipsis
+            )
+        }
+
+        Crossfade(targetState = status) {
+            when (it) {
+                "live" -> {
+                    if (isOnline) {
+                        LiveFlag()
+                    }
+                }
+                "planned" -> {
+                    ScheduledFlag()
+                }
             }
         }
     }
 
-    Row(modifier = Modifier.padding(top = 5.dp)) {
+    var participantUsers by remember {
-        Column(modifier = Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {
+        mutableStateOf<ImmutableList<Pair<Participant, User>>>(
-            Row() {
+            persistentListOf()
-                subject?.let {
+        )
-                    Row(verticalAlignment = Alignment.CenterVertically, modifier = Modifier.padding(top = 5.dp, bottom = 5.dp)) {
+    }
-                        Text(
-                            text = it,
-                            fontWeight = FontWeight.Bold,
-                            maxLines = 3,
-                            overflow = TextOverflow.Ellipsis,
-                            modifier = Modifier.fillMaxWidth()
-                        )
-                    }
-                }
-            }
 
-            participantUsers.forEach {
+    LaunchedEffect(key1 = eventUpdates) {
-                Row(
+        launch(Dispatchers.IO) {
-                    verticalAlignment = Alignment.CenterVertically,
+            val newParticipantUsers = participants.mapNotNull { part ->
-                    modifier = Modifier
+                LocalCache.checkGetOrCreateUser(part.key)?.let { Pair(part, it) }
-                        .padding(top = 5.dp, start = 10.dp, end = 10.dp)
+            }.toImmutableList()
-                        .clickable {
-                            nav("User/${it.second.pubkeyHex}")
-                        }
-                ) {
-                    ClickableUserPicture(it.second, 25.dp, accountViewModel)
-                    Spacer(Modifier.width(5.dp))
-                    UsernameDisplay(it.second, Modifier.weight(1f))
-                    Spacer(Modifier.width(5.dp))
-                    it.first.role?.let {
-                        Text(
-                            text = it.capitalize(Locale.ROOT),
-                            color = MaterialTheme.colors.placeholderText,
-                            maxLines = 1
-                        )
-                    }
-                }
-            }
 
-            media?.let { media ->
+            if (!equalImmutableLists(newParticipantUsers, participantUsers)) {
+                participantUsers = newParticipantUsers
+            }
+        }
+    }
+
+    participantUsers.forEach {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier
+                .padding(top = 5.dp, start = 10.dp, end = 10.dp)
+                .clickable {
+                    nav("User/${it.second.pubkeyHex}")
+                }
+        ) {
+            ClickableUserPicture(it.second, 25.dp, accountViewModel)
+            Spacer(Modifier.width(5.dp))
+            UsernameDisplay(it.second, Modifier.weight(1f))
+            Spacer(Modifier.width(5.dp))
+            it.first.role?.let {
+                Text(
+                    text = it.capitalize(Locale.ROOT),
+                    color = MaterialTheme.colors.placeholderText,
+                    maxLines = 1
+                )
+            }
+        }
+    }
+
+    media?.let { media ->
+        if (status == "live") {
+            if (isOnline) {
                 Row(
                     verticalAlignment = Alignment.CenterVertically,
                     modifier = Modifier.padding(10.dp)
@@ -2678,6 +2728,32 @@ fun RenderLiveActivityEvent(baseNote: Note, accountViewModel: AccountViewModel,
                         description = subject
                     )
                 }
+            } else {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    modifier = Modifier
+                        .padding(10.dp)
+                        .height(100.dp)
+                ) {
+                    Text(
+                        text = stringResource(id = R.string.live_stream_is_offline),
+                        color = MaterialTheme.colors.onBackground,
+                        fontWeight = FontWeight.Bold
+                    )
+                }
+            }
+        } else if (status == "ended") {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                modifier = Modifier
+                    .padding(10.dp)
+                    .height(100.dp)
+            ) {
+                Text(
+                    text = stringResource(id = R.string.live_stream_has_ended),
+                    color = MaterialTheme.colors.onBackground,
+                    fontWeight = FontWeight.Bold
+                )
             }
         }
     }

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/ChannelScreen.kt

@@ -714,9 +714,9 @@ private fun LiveChannelActionOptions(
 }
 
 @Composable
-private fun LiveFlag() {
+fun LiveFlag() {
     Text(
-        text = "LIVE",
+        text = stringResource(id = R.string.live_stream_live_tag),
         color = Color.White,
         fontWeight = FontWeight.Bold,
         modifier = remember {
@@ -728,6 +728,51 @@ private fun LiveFlag() {
     )
 }
 
+@Composable
+fun EndedFlag() {
+    Text(
+        text = stringResource(id = R.string.live_stream_ended_tag),
+        color = Color.White,
+        fontWeight = FontWeight.Bold,
+        modifier = remember {
+            Modifier
+                .clip(SmallBorder)
+                .drawBehind { drawRect(Color.Black) }
+                .padding(horizontal = 5.dp)
+        }
+    )
+}
+
+@Composable
+fun OfflineFlag() {
+    Text(
+        text = stringResource(id = R.string.live_stream_offline_tag),
+        color = Color.White,
+        fontWeight = FontWeight.Bold,
+        modifier = remember {
+            Modifier
+                .clip(SmallBorder)
+                .drawBehind { drawRect(Color.Black) }
+                .padding(horizontal = 5.dp)
+        }
+    )
+}
+
+@Composable
+fun ScheduledFlag() {
+    Text(
+        text = stringResource(id = R.string.live_stream_planned_tag),
+        color = Color.White,
+        fontWeight = FontWeight.Bold,
+        modifier = remember {
+            Modifier
+                .clip(SmallBorder)
+                .drawBehind { drawRect(Color.Black) }
+                .padding(horizontal = 5.dp)
+        }
+    )
+}
+
 @Composable
 private fun NoteCopyButton(
     note: Channel

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/HomeScreen.kt

@@ -36,8 +36,8 @@ import androidx.lifecycle.LifecycleEventObserver
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.service.NostrHomeDataSource
+import com.vitorpamplona.amethyst.service.OnlineChecker
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
-import com.vitorpamplona.amethyst.ui.dal.checkIfOnline
 import com.vitorpamplona.amethyst.ui.navigation.Route
 import com.vitorpamplona.amethyst.ui.note.UpdateZapAmountDialog
 import com.vitorpamplona.amethyst.ui.screen.FeedState
@@ -76,6 +76,8 @@ fun HomeScreen(
 
     val lifeCycleOwner = LocalLifecycleOwner.current
     DisposableEffect(accountViewModel) {
+        liveActivitiesViewModel.invalidateData(true)
+
         val observer = LifecycleEventObserver { _, event ->
             if (event == Lifecycle.Event.ON_RESUME) {
                 NostrHomeDataSource.invalidateFilters()
@@ -193,7 +195,7 @@ private fun FeedLoaded(
         state = listState
     ) {
         itemsIndexed(state.feed.value, key = { _, item -> item.idHex }) { _, item ->
-            CheckIfOnline(item) {
+            CheckIfLiveActivityIsOnline(item) {
                 ChannelHeader(
                     channelHex = remember { item.idHex },
                     showVideo = false,
@@ -210,13 +212,13 @@ private fun FeedLoaded(
 }
 
 @Composable
-fun CheckIfOnline(note: Note, whenOnline: @Composable () -> Unit) {
+fun CheckIfLiveActivityIsOnline(note: Note, whenOnline: @Composable () -> Unit) {
     val noteState by note.live().metadata.observeAsState()
     var online by remember { mutableStateOf(false) }
 
     LaunchedEffect(key1 = noteState) {
         launch(Dispatchers.IO) {
-            online = checkIfOnline((note.event as? LiveActivitiesEvent)?.streaming())
+            online = OnlineChecker.isOnline((note.event as? LiveActivitiesEvent)?.streaming())
         }
     }
 

app/src/main/res/values/strings.xml

@@ -456,4 +456,12 @@
     <string name="minimum_pow">Minimum PoW</string>
     <string name="auth">Auth</string>
     <string name="payment">Payment</string>
+
+    <string name="live_stream_live_tag">LIVE</string>
+    <string name="live_stream_offline_tag">OFFLINE</string>
+    <string name="live_stream_ended_tag">ENDED</string>
+    <string name="live_stream_planned_tag">SCHEDULED</string>
+
+    <string name="live_stream_is_offline">Livestream is Offline</string>
+    <string name="live_stream_has_ended">Livestream Ended</string>
 </resources>