Method requestBlockAnnouncements

src/thinblockmanager.cpp:191–219

We ask for announcements with blocks from the last 3 peers to provide a thin block first.

// We ask for announcements with blocks from the
// last 3 peers to provide a thin block first.
void ThinBlockManager::requestBlockAnnouncements(ThinBlockWorker& w, CNode& node) {

    typedef std::unique_ptr<BlockAnnHandle> annh;
    auto it = std::find_if(
            begin(announcers), end(announcers), [&w](const annh& h) {
        return w.nodeID() == h->nodeID();
    });

    if (it != end(announcers)) {
        // Already receiving announcements from peer.
        // Move to the front.
        std::rotate(it, it + 1, end(announcers));
        return;
    }

    auto handle = w.requestBlockAnnouncements(node);
    if (!bool(handle)) {
        // Peer cannot provide block announcements
        // with thin blocks.
        return;
    }

    announcers.push_back(std::move(handle));

    // Only request thin block announcements from 3 peers at a time.
    if (announcers.size() > 3)
        announcers.erase(begin(announcers));
    LogPrint("ann", "Thin block announcers: %d\n", announcers.size());
}