Promformat is a PromQL formatter written in Python. It works by building an AST from the CST provided by ANTLR4, and then using that to produce formatted code.
The result should be semantically identical to the unformatted version as promval compares the parse tree of the original and formatted expression and fails if they are not identical.
From command line:
# Format a file containing PromQL
promformat <path to file>
# No arguments enters interpreter
promformat
As library:
from promformat import format_query
print(format_query("1+1"))
Given the PromQL:
job:request_latency_seconds:mean5m{job="myjob"} > 0.5
it will be formatted:
job:request_latency_seconds:mean5m
{
job="myjob"
} > 0.5
A more complex example:
(node_filesystem_avail_bytes * 100) / node_filesystem_size_bytes < 10 and ON (instance, device, mountpoint) predict_linear(node_filesystem_avail_bytes{fstype!~"tmpfs"}[1h], 24 * 3600) < 0 and ON (instance, device, mountpoint) node_filesystem_readonly == 0
(
node_filesystem_avail_bytes * 100
) / node_filesystem_size_bytes < 10 and ON (
instance,
device,
mountpoint
)
predict_linear (
node_filesystem_avail_bytes
{
fstype!~"tmpfs"
} [1h],
24 * 3600
) < 0 and ON (
instance,
device,
mountpoint
)
node_filesystem_readonly == 0
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