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// wire format is <len>(<header><message>)
// header is a varint, channel << 4 | <4-bit-type>
// type=0, should be the first message sent on a channel
message Feed {
required bytes discoveryKey = 1;
optional bytes nonce = 2;
}
// type=1, overall connection handshake. should be send just after the feed message on the first channel only
message Handshake {
optional bytes id = 1;
optional bool live = 2; // keep the connection open forever? both ends have to agree
optional bytes userData = 3;
repeated string extensions = 4;
optional bool ack = 5; // Should all blocks be explicitly acknowledged?
}
// type=2, message indicating state changes etc.
// initial state for uploading/downloading is true
// if both ends are not downloading and not live it is safe to consider the stream ended
message Info {
optional bool uploading = 1;
optional bool downloading = 2;
}
// type=3, what do we have?
message Have {
required uint64 start = 1;
optional uint64 length = 2 [default = 1]; // defaults to 1
optional bytes bitfield = 3;
}
// type=4, what did we lose?
message Unhave {
required uint64 start = 1;
optional uint64 length = 2 [default = 1]; // defaults to 1
}
// type=5, what do we want? remote should start sending have messages in this range
message Want {
required uint64 start = 1;
optional uint64 length = 2; // defaults to Infinity or feed.length (if not live)
}
// type=6, what don't we want anymore?
message Unwant {
required uint64 start = 1;
optional uint64 length = 2; // defaults to Infinity or feed.length (if not live)
}
// type=7, ask for data
message Request {
required uint64 index = 1;
optional uint64 bytes = 2;
optional bool hash = 3;
optional uint64 nodes = 4;
}
// type=8, cancel a request
message Cancel {
required uint64 index = 1;
optional uint64 bytes = 2;
optional bool hash = 3;
}
// type=9, get some data
message Data {
message Node {
required uint64 index = 1;
required bytes hash = 2;
required uint64 size = 3;
}
required uint64 index = 1;
optional bytes value = 2;
repeated Node nodes = 3;
optional bytes signature = 4;
}
// type=15 (last message) is an extension message
// that is encoded like this <varint user-type><payload>