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nixos/statsd: refactor test (#40554)

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`statsd` is a daemon written in `node` to gather statistics over UDP.
The current test ensures that a port is open, but the basic
functionality isn't sufficiently tested.

This patch contains the following changes:

* Simplified port scanning (`waitForOpenPort` rather than `netcat` magic).

* Issue a TCP command to check the health of the `statsd` server.

* Simple script to check if `statsd` receives data over UDP and confirms
  the basic functionality of the TCP interface on `8126` for admin
  purposes.
This commit is contained in:
Maximilian Bosch 2018-05-16 18:03:55 +02:00 committed by xeji
parent 9788459678
commit 70d64d129e
1 changed files with 15 additions and 4 deletions
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19
nixos/tests/statsd.nix
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@ -8,7 +8,7 @@ with lib;
maintainers = [ ma27 ];
};
nodes.statsd1 = {
machine = {
services.statsd.enable = true;
services.statsd.backends = [ "statsd-influxdb-backend" "console" ];
services.statsd.extraConfig = ''
@ -33,8 +33,19 @@ with lib;
};
testScript = ''
$statsd1->start();
$statsd1->waitForUnit("statsd.service");
$statsd1->waitUntilSucceeds("nc -z 127.0.0.1 8126");
$machine->start();
$machine->waitForUnit("statsd.service");
$machine->waitForOpenPort(8126);
# check state of the `statsd` server
$machine->succeed('[ "health: up" = "$(echo health | nc 127.0.0.1 8126 -w 120 -N)" ];');
# confirm basic examples for metrics derived from docs:
# https://github.com/etsy/statsd/blob/v0.8.0/README.md#usage and
# https://github.com/etsy/statsd/blob/v0.8.0/docs/admin_interface.md
$machine->succeed("echo 'foo:1|c' | nc -u -w 0 127.0.0.1 8125");
$machine->succeed("echo counters | nc -w 120 127.0.0.1 8126 -N | grep foo");
$machine->succeed("echo 'delcounters foo' | nc -w 120 127.0.0.1 8126 -N");
$machine->fail("echo counters | nc -w 120 127.0.0.1 8126 -N | grep foo");
'';
})