support/testing: add rrdtool runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 8756b76a0f8d4844c7389c7fc45dbbfc880ebae1)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1864,6 +1864,7 @@ F:	support/testing/tests/package/test_python_pyqt5/
 F:	support/testing/tests/package/test_python_spake2.py
 F:	support/testing/tests/package/test_rdma_core.py
 F:	support/testing/tests/package/test_rdma_core/
+F:	support/testing/tests/package/test_rrdtool.py
 F:	support/testing/tests/package/test_screen.py
 F:	support/testing/tests/package/test_sed.py
 F:	support/testing/tests/package/test_socat.py

support/testing/tests/package/test_rrdtool.py

@@ -0,0 +1,100 @@
+import os
+
+import infra.basetest
+
+
+class TestRRDTool(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_RRDTOOL=y
+        BR2_PACKAGE_RRDTOOL_RRDGRAPH=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # We check the program can run.
+        self.assertRunOk("rrdtool --version")
+
+        # This test sequence is inspired from parts of the RRDTool
+        # tutorial:
+        # https://oss.oetiker.ch/rrdtool/tut/rrdtutorial.en.html
+
+        rrd_file = "test.rrd"
+        data_source = "speed"
+
+        cmd = f"rrdtool create {rrd_file}"
+        cmd += " --start 920804400"
+        cmd += f" DS:{data_source}:COUNTER:600:U:U"
+        cmd += " RRA:AVERAGE:0.5:1:24"
+        cmd += " RRA:AVERAGE:0.5:6:10"
+        self.assertRunOk(cmd)
+
+        # Some data to fill in our database, from the tutorial page.
+        data = [12345, 12357, 12363, 12363, 12363,
+                12373, 12383, 12393, 12399, 12405,
+                12411, 12415, 12420, 12422, 12423]
+        timestamp = 920804700  # timestamp of: Sun Mar  7 12:05:00 PM CET 1999
+
+        # We check we can put our data in the database. We start at
+        # our timestamp, then increase by 5 minutes.
+        for d in data:
+            cmd = f"rrdtool update {rrd_file} {timestamp}:{d}"
+            timestamp += 300
+            self.assertRunOk(cmd)
+
+        # We check we can read back our data.
+        cmd = f"rrdtool fetch {rrd_file}"
+        cmd += " AVERAGE --start 920804400 --end 920809200"
+        out, ret = self.emulator.run(cmd)
+        self.assertEqual(ret, 0)
+        self.assertEqual(out[0].strip(), data_source)
+        # We check that at time=920805600 we have speed=0.
+        data_line = next(ln for ln in out if ln.strip().startswith('920805600:'))
+        speed = float(data_line.split(':')[1])
+        self.assertAlmostEqual(speed, 0.)
+
+        # We generate a first simple image graph.
+        cmd = "rrdtool graph speed.png"
+        cmd += " --start 920804400 --end 920808000"
+        cmd += f" DEF:myspeed={rrd_file}:{data_source}:AVERAGE"
+        cmd += " LINE2:myspeed#FF0000"
+        self.assertRunOk(cmd, timeout=20)
+
+        # We check the output file exists and has a size
+        # greater than zero.
+        self.assertRunOk("test -s speed.png")
+
+        # We generate a slightly more complex graph.
+        cmd = "rrdtool graph speed2.png"
+        cmd += " --start 920804400 --end 920808000"
+        cmd += " --vertical-label m/s"
+        cmd += f" DEF:myspeed={rrd_file}:{data_source}:AVERAGE"
+        cmd += " CDEF:realspeed=myspeed,1000,\\*"
+        cmd += " LINE2:realspeed#FF0000"
+        self.assertRunOk(cmd, timeout=20)
+
+        # Again, we check the output file exists.
+        self.assertRunOk("test -s speed2.png")
+
+        # Finally, we generate the last graph, with some rules.
+        cmd = "rrdtool graph speed3.png"
+        cmd += " --start 920804400 --end 920808000"
+        cmd += " --vertical-label km/h"
+        cmd += f" DEF:myspeed={rrd_file}:{data_source}:AVERAGE"
+        cmd += " \"CDEF:kmh=myspeed,3600,*\""
+        cmd += " CDEF:fast=kmh,100,GT,kmh,0,IF"
+        cmd += " CDEF:good=kmh,100,GT,0,kmh,IF"
+        cmd += " HRULE:100#0000FF:\"Maximum allowed\""
+        cmd += " AREA:good#00FF00:\"Good speed\""
+        cmd += " AREA:fast#FF0000:\"Too fast\""
+        self.assertRunOk(cmd, timeout=20)
+
+        # And again, we check the output file exists.
+        self.assertRunOk("test -s speed3.png")