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RELNOTES: refresh with more 2.0-alpha3 changes
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# PyLink 2.0-alpha3 (unreleased)
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This release contains all changes from 1.3.0, plus the following:
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#### New features
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- **Experimental daemonization support via `pylink -d`!** [issue#187](https://github.com/GLolol/PyLink/issues/187)
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- Clientbot now supports expansions such as `$nick` in autoperform
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- Relay endburst delay (on InspIRCd networks) is now configurable via the `servers:NETNAME:relay_endburst_delay` option.
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- Relay now translates STATUSMSG messages (e.g. `@#channel` messages) for target networks instead of passing them on as-is. [issue#570](https://github.com/GLolol/PyLink/issues/570)
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- Relay endburst delay on InspIRCd networks is now configurable via the `servers::NETNAME::relay_endburst_delay` option.
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#### Feature changes
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- New (alpha-quality) `antispam` plugin targeting mass-highlight spam: it supports any combination of kick, ban, quiet (mute), and kill as punishment. [issue#359](https://github.com/GLolol/PyLink/issues/359)
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- **Reverted the commit making SIGHUP shutdown the PyLink daemon**. Now, SIGUSR1 and SIGHUP both trigger a rehash, while SIGTERM triggers a shutdown.
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- The `raw` command has been split into a new plugin (`plugins/raw.py`) with two permissions: `raw.raw` for Clientbot networks, and `raw.raw.unsupported_network` for other protocols. Using raw commands outside Clientbot is not supported. [issue#565](https://github.com/GLolol/PyLink/issues/565)
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- The servermaps plugin now uses two perms for `map` and `localmap`: `servermaps.map` and `servermaps.localmap` respectively
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- The servermaps plugin now uses two permissions for `map` and `localmap`: `servermaps.map` and `servermaps.localmap` respectively
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- The servermaps plugin now shows the uplink server name for Clientbot links
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- Added `--trace / -t` options to the launcher for integration with Python's `trace` module.
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- `showuser` and `showchan` now consistently report times in UTC
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#### Bug fixes
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- protocols/clientbot: fix errors when connecting to networks with mixed-case server names (e.g. AfterNET)
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#### Internal improvements
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- **Reading from sockets now uses select instead of one thread per network.**
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- This new code uses the Python selectors module, which automatically chooses the fastest polling backend available ([`epoll|kqueue|devpoll > poll > select`](https://github.com/python/cpython/blob/v3.6.5rc1/Lib/selectors.py#L599-L601)).
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- Optimized `irc.nick_to_uid` by having `PyLinkNetworkCore.users` and `classes.User` transparently maintain an index mapping nicks to UIDs
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- This new code uses the Python selectors module, which automatically chooses the fastest polling backend available ([`epoll|kqueue|devpoll > poll > select`](https://github.com/python/cpython/blob/v3.6.5/Lib/selectors.py#L599-L601)).
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- **API Break: significantly reworked channel handling for service bots**. [issue#265](https://github.com/GLolol/PyLink/issues/265)
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- The `ServiceBot.extra_channels` attribute in previous versions is replaced with `ServiceBot.dynamic_channels`, which is accessed indirectly via new functions `ServiceBot.add_persistent_channel()`, `ServiceBot.remove_persistent_channel()`, `ServiceBot.get_persistent_channels()`. This API also replaces `ServiceBot.join()` for most plugins, which now joins channels *non-persistently*.
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- This API change provides plugins with a way of registering dynamic persistent channels, which are consistently rejoined on kick or kill
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- Persistent channels are also "dynamic" in the sense that PyLink service bots will now part channels marked persistent when they become empty, and rejoin when it is recreated
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- This new implementation is also plugin specific, as plugins must provide a namespace (usually the plugin name) when managing persistent channels using `ServiceBot.(add|remove)_persistent_channel()`
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- New abstraction: `ServiceBot.get_persistent_channels()` which fetches the list of all persistent channels on a network (i.e. *both* the config defined channels and what's registered in `dynamic_channels`)
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- New abstraction: `ServiceBot.part()` sends a part request to channels and only succeeds if it is not marked persistent by any plugin. This effectively works around the long-standing issue of relay-services conflicts. [issue#265](https://github.com/GLolol/PyLink/issues/265)
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- Major optimizations to `irc.nick_to_uid`: `PyLinkNetworkCore.users` and `classes.User` now transparently maintain an index mapping nicks to UIDs instead of doing reverse lookup on every call.
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- This introduces a new `UserMapping` class, which stores User objects by UID and provides a `bynick` dict storing case-normalized nicks to lists of UIDs.
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- `classes.User.nick` is now a property, where the setter implicitly updates the `bynick` index with a pre-computed case-normalized version of the nick (`User.lower_nick`)
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- Various relay optimizations.
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- Rewritten CTCP plugin, now extending to all service bots. [issue#468](https://github.com/GLolol/PyLink/issues/468), [issue#407](https://github.com/GLolol/PyLink/issues/407)
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- Relay no longer spams configured ULines with "message dropped because you aren't in a common channel" errors
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- Relay no longer spams configured U-lines with "message dropped because you aren't in a common channel" errors
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- The `endburst_delay` option to `spawn_server()` was removed from the protocol spec, and replaced by a private API used by protocols/inspircd and relay.
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- New API: hook functions can now block further execution from other handlers by returning False. [issue#547](https://github.com/GLolol/PyLink/issues/547)
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- New API: added `irc.get_server_option()` to fetch server-specific config variables and global settings as fallback. [issue#574](https://github.com/GLolol/PyLink/issues/574)
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- automode: replace assert checks with proper exceptions
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- Renamed methods in log, utils, conf to snake case. [issue#523](https://github.com/GLolol/PyLink/issues/523)
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- Remove `structures.DeprecatedAttributesObject`; it's vastly inefficient for what it accomplishes
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- clientbot: removed unreliable pre-/WHO join bursting with `userhost-in-names`
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# PyLink 2.0-alpha2 (2018-01-16)
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This release includes all changes from 1.2.2-dev, plus the following:
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