Lavalink and NodeLink

Both servers use the same API. A call the server can't do throws before anything is sent.

Which server is it

Nyra reads GET /v4/info every time a node connects, so you never say which server it is. node.IsNodeLink is true for NodeLink, node.Version is the version, and node.HasPlugin("lavasrc-plugin") checks for a plugin. These come from the last connect, so before the first connect IsNodeLink is false and Version is null.

A null version means a dev build. Dev builds count as the newest version, so treat null as new when you compare (node.Version >= x is false when it is null):

if (node.Version is not { } version || version >= new NodeVersion(3, 10, 0))
{
    // the server is 3.10.0 or newer, or a dev build
}

Nyra needs Lavalink 4.2.0 or newer and NodeLink 3.9.0 or newer. Calls on an older server throw IncompatibleServerException. More info: Node and NodeVersion.

What only one server can do

Calling these on the wrong server throws NotSupportedException with the feature's name. If your bot runs on both servers, check node.IsNodeLink first.

Only NodeLink

• These filters: EchoFilter, ReverbFilter, ChorusFilter, PhaserFilter, FlangerFilter, HighPassFilter, CompressorFilter, SpatialFilter, PhonographFilter, TesseractFilter. Also filter transitions
• Crossfade, fading, ducking, loudness normalizer and loading the next track ahead
• Mix layers
• SponsorBlock and YouTube settings
• Player groups (node.Groups)
• Chapters and track meanings, node.Tracks.EncodeAsync, stream URLs and audio streams
• Live stream info and EternalBox events
• PlayOptions.AudioTrackId and node.GetConnectionStatusAsync()
• Some search sources. Each SearchType value says which

Only Lavalink

• connection.PlayIdentifierAsync
• connection.Filters.SetVolumeFilterAsync

NodeLink, or Lavalink with a plugin

• Lyrics need NodeLink, or Lavalink with the LavaLyrics plugin
• Some search sources need NodeLink, or Lavalink with the LavaSrc plugin

When the two servers do the same thing in different ways, the remarks of that member in the API reference say how.