When the number of sessions reaches MAX_SESSIONS, which defaults
to 1,000, turn off TCP and SSL listening sockets to prevent new
connections. When the session count falls below a low watermark,
currently 90% of MAX_SESSIONS, the listening sockets will be re-opened.
Helps prevent DoS and limit open file usage.
Bug fix: do not start serving paused connections until the buffer
socket is sufficiently drained. Also, loop.
Move session logging code to protocol.py from electrum_rpc.py
Use it for periodic logging controlled by envvar LOG_SESSIONS
For each session, track sent transaction stats and show that
per-session instead of errors
Daemon URLs can be comma-separated in the DAEMON_URL env var.
Surrounding whitespace is stripped.
http:// is preprended if missing.
The coin's default port is supplied if missing.
A trailing / is supplied if missing.
Closes#33
Neil Booth
Shane Moore
Johann Bauer