The new function named 'map_to_redis_hset_args' can be used to format
a map's key-value pairs into redis HSET (or HMSET) arg list.
This new function is dedicated for redis to avoid abuse for other
data integrations.
The rule engine unescape function should convert the escape sequence \a
to the alarm bell symbol (ASCII 7). This bug was created as it was
assumed that Erlang convert $\a to 7 but Erlang does not handle the \a
escape sequence and instead convert it to 97 (ASCII code for a).
Fixes:
https://emqx.atlassian.net/browse/EMQX-12313
The added `unescape` function unescapes escape sequences, transforming
them back to their represented characters. The following escape
sequences are supported:
- Standard C escape sequences:
- `\n` for newline (LF)
- `\t` for horizontal tab (HT)
- `\r` for carriage return (CR)
- `\b` for backspace (BS)
- `\f` for formfeed (FF)
- `\v` for vertical tab (VT)
- `\'` for single quote (')
- `\"` for double quote (")
- `\\` for backslash (\)
- `\?` for question mark (?)
- `\a` for alert (bell, BEL)
- Hexadecimal escape codes:
- `\xH...` where `H...` is one or more hexadecimal digits (0-9, A-F,
a-f), allowing for the encoding of arbitrary utf32 characters.
If an escape sequence is not recognized, or if the hexadecimal escape
does not form a valid Unicode character, the function generates an
exception.
Fixes:
https://github.com/emqx/emqx/issues/12460https://emqx.atlassian.net/browse/EMQX-11847
This commit adds the functions timezone_to_offset_seconds and its alias
timezone_to_second to the rule engine. As the names suggests, these
functions convert a timzone offset string such as "+02:00", "Z", "local"
to an integer representing how many seconds that the given timezone
differs from UTC. timezone_to_offset_seconds is the one of the two
functions that should be advertised while timezone_to_second in kept for
backwards compatibility with 4.X.
Fixes:
https://emqx.atlassian.net/browse/EMQX-10058
Fixes https://emqx.atlassian.net/browse/EMQX-9130
Since buffer workers always support async calls ("outer calls"), we
should decouple those two call modes (inner and outer), and avoid
exposing the inner call configuration to user to avoid complexity.
For bridges that currently only allow sync query modes, we should
allow them to be configured with async. That means basically all
bridge types except Kafka Producer.
This commit adds a default timeout of 10 seconds to the rule engine's
`jq/2` function, and adds a new function `jq/3` (where the last parameter is
a timeout value). The default timeout can be configured with the setting
"rule_engine.jq_function_default_timeout".
Having a timeout when executing jq code in the rule engine is important
as jq code can potentially run forever. Also, the Erlang jq library
limits the number of jq programs that can execute concurrently so a jq
program that loops forever could potentially also prevent a "non-buggy"
jq program from ever starting.
This commit adds a function to the rule engine that alows users
to transform text or JSON objects using [jq filter programs][1].
[jq][1] is a command line tool that can be used to transform
and filter JSON text using jq's built-in language. The rule engine
function that is added with this commit uses the
[Erlang jq NIF library][2] that wraps the jq C library in an
Erlang NIF function.
[1]: https://stedolan.github.io/jq/
[2]: https://github.com/emqx/jq
zmstone