refactor test framework

Change-Id: I31da3b1857b6399f9899276a2d99cdd19436296c
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Signed-off-by: Matej Klotton <mklotton@cisco.com>
Signed-off-by: Jan Gelety <jgelety@cisco.com>
Signed-off-by: Juraj Sloboda <jsloboda@cisco.com>

test/hook.py

@@ -0,0 +1,128 @@
+import signal
+import os
+import pexpect
+from logging import *
+
+
+class Hook(object):
+    """
+    Generic hooks before/after API/CLI calls
+    """
+
+    def before_api(self, api_name, api_args):
+        """
+        Function called before API call
+        Emit a debug message describing the API name and arguments
+
+        @param api_name: name of the API
+        @param api_args: tuple containing the API arguments
+        """
+        debug("API: %s (%s)" % (api_name, api_args))
+
+    def after_api(self, api_name, api_args):
+        """
+        Function called after API call
+
+        @param api_name: name of the API
+        @param api_args: tuple containing the API arguments
+        """
+        pass
+
+    def before_cli(self, cli):
+        """
+        Function called before CLI call
+        Emit a debug message describing the CLI
+
+        @param cli: CLI string
+        """
+        debug("CLI: %s" % (cli))
+
+    def after_cli(self, cli):
+        """
+        Function called after CLI call
+        """
+        pass
+
+
+class VppDiedError(Exception):
+    pass
+
+
+class PollHook(Hook):
+    """ Hook which checks if the vpp subprocess is alive """
+
+    def __init__(self, testcase):
+        self.vpp_dead = False
+        self.testcase = testcase
+
+    def spawn_gdb(self, gdb_path, core_path):
+        gdb_cmdline = gdb_path + ' ' + self.testcase.vpp_bin + ' ' + core_path
+        gdb = pexpect.spawn(gdb_cmdline)
+        gdb.interact()
+        try:
+            gdb.terminate(True)
+        except:
+            pass
+        if gdb.isalive():
+            raise Exception("GDB refused to die...")
+
+    def on_crash(self, core_path):
+        if self.testcase.interactive:
+            gdb_path = '/usr/bin/gdb'
+            if os.path.isfile(gdb_path) and os.access(gdb_path, os.X_OK):
+                # automatically attach gdb
+                self.spawn_gdb(gdb_path, core_path)
+                return
+            else:
+                error("Debugger '%s' does not exist or is not an executable.." %
+                      gdb_path)
+
+        critical('core file present, debug with: gdb ' +
+                 self.testcase.vpp_bin + ' ' + core_path)
+
+    def poll_vpp(self):
+        """
+        Poll the vpp status and throw an exception if it's not running
+        :raises VppDiedError: exception if VPP is not running anymore
+        """
+        if self.vpp_dead:
+            # already dead, nothing to do
+            return
+
+        self.testcase.vpp.poll()
+        if self.testcase.vpp.returncode is not None:
+            signaldict = dict(
+                (k, v) for v, k in reversed(sorted(signal.__dict__.items()))
+                if v.startswith('SIG') and not v.startswith('SIG_'))
+            msg = "VPP subprocess died unexpectedly with returncode %d [%s]" % (
+                self.testcase.vpp.returncode,
+                signaldict[abs(self.testcase.vpp.returncode)])
+            critical(msg)
+            core_path = self.testcase.tempdir + '/core'
+            if os.path.isfile(core_path):
+                self.on_crash(core_path)
+            self.testcase.vpp_dead = True
+            raise VppDiedError(msg)
+
+    def after_api(self, api_name, api_args):
+        """
+        Check if VPP died after executing an API
+
+        :param api_name: name of the API
+        :param api_args: tuple containing the API arguments
+        :raises VppDiedError: exception if VPP is not running anymore
+
+        """
+        super(PollHook, self).after_api(api_name, api_args)
+        self.poll_vpp()
+
+    def after_cli(self, cli):
+        """
+        Check if VPP died after executing a CLI
+
+        :param cli: CLI string
+        :raises Exception: exception if VPP is not running anymore
+
+        """
+        super(PollHook, self).after_cli(cli)
+        self.poll_vpp()