Functions

Functions appear in expressions and take positional and/or named arguments, producing a value as a result of their computation.

Function signatures have the following notation:

f(arg1:<type>, arg2=<type>, [arg3=type]) -> <type>

• arg:<type>: positional argument
• arg=<type>: named argument
• [arg=type]: optional (named) argument
• -> <type>: function return type

TQL features the uniform function call syntax (UFCS), which allows you to interchangeably call a function with at least one argument either as free function or method. For example, length(str) and str.length() resolve to the identical function call. The latter syntax is particularly suitable for function chaining, e.g., x.f().g().h() reads left-to-right as "start with x, apply f(), then g() and then h()," compared to h(g(f(x))), which reads "inside out."

Throughout our documentation, we use the free function style in the synopsis but often resort to the method style when it is more idiomatic.

Aggregation

Function	Description	Example
all	Computes the conjunction (AND) of all boolean values	all([true,true,false])
any	Computes the disjunction (OR) of all boolean values	any([true,false,true])
collect	Creates a list of all non-null values, preserving duplicates	collect([1,2,2,3])
count	Counts the events or non-null values	count([1,2,null])
count_distinct	Counts all distinct non-null values	count_distinct([1,2,2,3])
distinct	Creates a sorted list without duplicates of non-null values	distinct([1,2,2,3])
first	Takes the first non-null value	first([null,2,3])
last	Takes the last non-null value	last([1,2,null])
max	Computes the maximum of all values	max([1,2,3])
mean	Computes the mean of all values	mean([1,2,3])
median	Computes the approximate median with a t-digest algorithm	median([1,2,3,4])
min	Computes the minimum of all values	min([1,2,3])
mode	Takes the most common non-null value	mode([1,1,2,3])
quantile	Computes the specified quantile q of values	quantile([1,2,3,4], q=0.5)
stddev	Computes the standard deviation of all values	stddev([1,2,3])
sum	Computes the sum of all values	sum([1,2,3])
value_counts	Returns a list of values with their frequency	value_counts([1,2,2,3])
variance	Computes the variance of all values	variance([1,2,3])

Record

Function	Description	Example
get	Accesses a field of a record	record.get("field", default)
has	Checks whether a record has a field	record.has("field")
merge	Merges two records	merge(foo, bar)
sort	Sorts a record by field names	xs.sort()

List

Function	Description	Example
append	Inserts an element at the back of a list	xs.append(y)
prepend	Inserts an element at the front of a list	xs.prepend(y)
concatenate	Merges two lists	concatenate(xs, ys)
get	Accesses an element of a list	list.get(index, default)
length	Retrieves the length of a list	[1,2,3].length()
map	Maps each list element to an expression	xs.map(x, x + 3)
sort	Sorts a list by its values.	xs.sort()
where	Filters list elements based on a predicate	xs.where(x, x > 5)
zip	Combines two lists into a list of pairs	zip(xs, ys)

Subnet

Function	Description	Example
network	Retrieves the network address of a subnet	10.0.0.0/8.network()

String

Inspection

Function	Description	Example
length_bytes	Returns the length of a string in bytes	"hello".length_bytes()
length_chars	Returns the length of a string in characters	"hello".length_chars()
starts_with	Checks if a string starts with a substring	"hello".starts_with("he")
ends_with	Checks if a string ends with a substring	"hello".ends_with("lo")
is_alnum	Checks if a string is alphanumeric	"hello123".is_alnum()
is_alpha	Checks if a string contains only letters	"hello".is_alpha()
is_lower	Checks if a string is in lowercase	"hello".is_lower()
is_numeric	Checks if a string contains only numbers	"1234".is_numeric()
is_printable	Checks if a string contains only printable characters	"hello".is_printable()
is_title	Checks if a string follows title case	"Hello World".is_title()
is_upper	Checks if a string is in uppercase	"HELLO".is_upper()
match_regex	Checks if a string partially matches a regular expression	"Hi".match_regex("[Hh]i")
slice	Slices a string with offsets and strides	"Hi".slice(begin=2, stride=4)

Transformation

Function	Description	Example
trim	Trims whitespace from both ends of a string	" hello ".trim()
trim_start	Trims whitespace from the start of a string	" hello".trim_start()
trim_end	Trims whitespace from the end of a string	"hello ".trim_end()
capitalize	Capitalizes the first character of a string	"hello".capitalize()
replace	Replaces characters within a string	"hello".replace("o", "a")
replace_regex	Reverses the characters of a string	"hello".replace("l+o", "y")
reverse	Reverses the characters of a string	"hello".reverse()
to_lower	Converts a string to lowercase	"HELLO".to_lower()
to_title	Converts a string to title case	"hello world".to_title()
to_upper	Converts a string to uppercase	"hello".to_upper()
split	Splits a string into substrings	split("a,b,c", ",")
split_regex	Splits a string into substrings with a regex	split_regex("a1b2c", r"\d")
join	Joins a list of strings into a single string	join(["a", "b", "c"], ",")

Filesystem

Function	Description	Example
file_contents	Reads a file's contents	file_contents("/path/to/file")
file_name	Extracts the file name from a file path	file_name("/path/to/log.json")
parent_dir	Extracts the parent directory from a file path	parent_dir("/path/to/log.json")

Parsing

Function	Description	Example
parse_cef	Parses a string as a CEF message	string.parse_cef()
parse_csv	Parses a string as CSV	string.parse_csv(header=["a","b"])
parse_grok	Parses a string following a grok pattern	string.parse_grok("%{IP:client} …")
parse_json	Parses a string as a JSON value	string.parse_json()
parse_kv	Parses a string as key-value pairs	string.parse_kv()
parse_leef	Parses a string as a LEEF message	string.parse_leef()
parse_ssv	Parses a string as SSV	string.parse_ssv(header=["a","b"])
parse_syslog	Parses a string as a syslog message	string.parse_syslog()
parse_tsv	Parses a string as TSV	string.parse_tsv(header=["a","b"])
parse_xsv	Parses a string as XSV	string.parse_xsv(",", ";", "", header=["a","b"])
parse_yaml	Parses a string as YAML	string.parse_yaml()

Printing

Function	Description	Example
print_csv	Prints a record as comma separated values	record.print_csv()
print_kv	Prints a record as Key-Value pairs	record.print_kv()
print_json	Prints a record as a JSON string	record.print_json()
print_ndjson	Prints a record as NDJSON string	record.print_ndjson()
print_ssv	Prints a record as space separated values	record.print_ssv()
print_tsv	Prints a record as tab separated values	record.print_tsv()
print_xsv	Prints a record as delimited separated values	record.print_tsv()
print_yaml	Prints a value as a YAML document	record.print_yaml()

Time & Date

Function	Description	Example
as_secs	Converts a duration into seconds	as_secs(42ms)
from_epoch	Interprets a duration as Unix time	from_epoch(time_ms * 1ms)
now	Gets the current wallclock time	now()
since_epoch	Turns a time into a duration since the Unix epoch	since_epoch(2021-02-24)
parse_time	Parses a timestamp following a given format	"10/11/2012".parse_time("%d/%m/%Y")
years	Converts a number to equivalent years	years(100)
months	Converts a number to equivalent months	months(100)
weeks	Converts a number to equivalent weeks	weeks(100)
days	Converts a number to equivalent days	days(100)
hours	Converts a number to equivalent hours	hours(100)
minutes	Converts a number to equivalent minutes	minutes(100)
seconds	Converts a number to equivalent seconds	seconds(100)
milliseconds	Converts a number to equivalent milliseconds	milliseconds(100)
microseconds	Converts a number to equivalent microseconds	microseconds(100)
nanoseconds	Converts a number to equivalent nanoseconds	nanoseconds(100)
count_years	Counts the number of years in a duration	count_years(100d)
count_months	Counts the number of months in a duration	count_months(100d)
count_weeks	Counts the number of weeks in a duration	count_weeks(100d)
count_days	Counts the number of days in a duration	count_days(100d)
count_hours	Counts the number of hours in a duration	count_hours(100d)
count_minutes	Counts the number of minutes in a duration	count_minutes(100d)
count_seconds	Counts the number of seconds in a duration	count_seconds(100d)
count_milliseconds	Counts the number of milliseconds in a duration	count_milliseconds(100d)
count_microseconds	Counts the number of microseconds in a duration	count_microseconds(100d)
count_nanoseconds	Counts the number of nanoseconds in a duration	count_nanoseconds(100d)

Math

Function	Description	Example
ceil	Takes the ceiling	ceil(4.2), ceil(3.2s, 1m)
floor	Takes the floor	floor(4.2), floor(32h, 1d)
random	Generates a random number	random()
round	Rounds a value	round(4.2), round(31m, 1h)
sqrt	Calculates the square root	sqrt(49)

Networking

Function	Description	Example
community_id	Computes a Community ID	community_id(src_ip=1.2.3.4, dst_ip=4.5.6.7, proto="tcp")
decapsulate	Decapsulates PCAP packets	decapsulate(this)
encrypt_cryptopan	Encrypts IPs via Crypto-PAn	encrypt_cryptopan(1.2.3.4)
is_v4	Checks if an IP is IPv4	is_v4(1.2.3.4)
is_v6	Checks if an IP is IPv6	is_v6(::1)

Hashing

Function	Description	Example
hash_md5	Computes a MD5 hash digest	hash_md5("foo")
hash_sha1	Computes a SHA1 hash digest	hash_sha1("foo")
hash_sha224	Computes a SHA224 hash digest	hash_sha224("foo")
hash_sha256	Computes a SHA256 hash digest	hash_sha256("foo")
hash_sha384	Computes a SHA384 hash digest	hash_sha384("foo")
hash_sha512	Computes a SHA512 hash digest	hash_sha512("foo")
hash_xxh3	Computes a XXH3 hash digest	hash_xxh3("foo")

Bit Operations

Function	Description	Example
bit_and	Computes the bit-wise AND of its arguments	bit_and(lhs, rhs)
bit_not	Computes the bit-wise NOT of its argument	bit_not(x)
bit_or	Computes the bit-wise OR of its arguments	bit_or(lhs, rhs)
bit_xor	Computes the bit-wise XOR of its arguments	bit_xor(lhs, rhs)
shift_left	Performs a bit-wise left shift	shift_left(lhs, rhs)
shift_right	Performs a bit-wise right shift	shift_right(lhs, rhs)

Encoding

function	description	example
encode_base64	Encodes bytes as Base64	encode_base64("Tenzir")
encode_hex	Encodes bytes as their hexadecimal representation	encode_hex("Tenzir")

Decoding

function	description	example
decode_base64	Decodes bytes as Base64	decode_base64("VGVuemly")
decode_hex	Decodes bytes from their hexadecimal representation	decode_hex("4e6f6E6365")

Type System

Introspection

Function	Description	Example
type_id	Retrieves the type id of an expression	type_id(1 + 3.2)
type_of	Retrieves the type definition of an expression	type_of(this)

Conversion

Function	Description	Example
int	Casts an expression to a signed integer	int(-4.2)
uint	Casts an expression to an unsigned integer	uint(4.2)
float	Casts an expression to a float	float(42)
string	Casts an expression to string	string(1.2.3.4)
ip	Casts an expression to an IP	ip("1.2.3.4")
subnet	Casts an expression to a subnet	subnet("1.2.3.4/16")
time	Casts an expression to a time value	time("2020-03-15")
duration	Casts an expression to a duration value	duration("1.34w")

Transposition

Function	Description	Example
flatten	Flattens nested data	flatten(this)
unflatten	Unflattens nested structures	unflatten(this)

Runtime

Function	Description	Example
config	Reads the configuration file	config()
env	Reads an environment variable	env("PATH")
secret	Reads a secret from a store	secret("KEY")