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draft/resume-0.2 implementation, message history support

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This commit is contained in:
Shivaram Lingamneni 2018-11-26 05:23:27 -05:00
parent 70364f5f67
commit a0bf548fc5
28 changed files with 1294 additions and 317 deletions
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27
irc/client_lookup_set.go
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@ -63,17 +63,17 @@ func (clients *ClientManager) Get(nick string) *Client {
return nil
}
func (clients *ClientManager) removeInternal(client *Client) (removed bool) {
func (clients *ClientManager) removeInternal(client *Client) (err error) {
// requires holding the writable Lock()
oldcfnick := client.NickCasefolded()
currentEntry, present := clients.byNick[oldcfnick]
if present {
if currentEntry == client {
delete(clients.byNick, oldcfnick)
removed = true
} else {
// this shouldn't happen, but we can ignore it
client.server.logger.Warning("internal", fmt.Sprintf("clients for nick %s out of sync", oldcfnick))
err = errNickMissing
}
}
return
@ -87,7 +87,28 @@ func (clients *ClientManager) Remove(client *Client) error {
if !client.HasNick() {
return errNickMissing
}
clients.removeInternal(client)
return clients.removeInternal(client)
}
// Resume atomically replaces `oldClient` with `newClient`, updating
// newClient's data to match. It is the caller's responsibility first
// to verify that the resume is allowed, and then later to call oldClient.destroy().
func (clients *ClientManager) Resume(newClient, oldClient *Client) (err error) {
clients.Lock()
defer clients.Unlock()
// atomically grant the new client the old nick
err = clients.removeInternal(oldClient)
if err != nil {
// oldClient no longer owns its nick, fail out
return err
}
// nick has been reclaimed, grant it to the new client
clients.removeInternal(newClient)
clients.byNick[oldClient.NickCasefolded()] = newClient
newClient.copyResumeData(oldClient)
return nil
}