Add fence agent that would trigger evacuate action

Signed-off-by: Dawid Deja <dawid.deja@intel.com>

fence_evacuate.py

@@ -0,0 +1,142 @@
+#!/usr/bin/python -tt
+
+import sys
+import logging
+import atexit
+from mistralclient.api import client
+sys.path.append("/usr/share/fence")
+from fencing import run_delay, all_opt, atexit_handler, check_input, \
+        process_input, show_docs
+
+
+def define_new_opts():
+    all_opt["domain"] = {
+        "getopt": "d:",
+        "longopt": "domain",
+        "help": "-d, --domain=[string]          DNS domain in which hosts"
+                         " live, useful when the cluster uses short names and"
+                         " nova uses FQDN",
+        "required": "0",
+        "shortdesc": "DNS domain in which hosts live",
+        "default": "",
+        "order": 5,
+    }
+    all_opt["user"] = {
+        "getopt": "u:",
+        "longopt": "user",
+        "help": "-u, --rabbit_user=string User to connect to Mistral",
+        "required": "1",
+        "shortdesc": "User to connect to Mistral",
+        "default": "",
+        "order": 5,
+    }
+    all_opt["password"] = {
+        "getopt": "p:",
+        "longopt": "password",
+        "help": "-p, --password=string Password to connect to Mistral",
+        "required": "1",
+        "shortdesc": "Password to connect to Mistral",
+        "default": "",
+        "order": 5,
+    }
+    all_opt["tenant"] = {
+        "getopt": "t:",
+        "longopt": "tenant",
+        "help": "-t, --tenant=string Tenant name to connect to Mistral",
+        "required": "1",
+        "shortdesc": "Tenant name to connect to Mistral",
+        "default": "",
+        "order": 5,
+    }
+    all_opt["auth_url"] = {
+        "getopt": "a:",
+        "longopt": "auth_url",
+        "help": "-a, --auth_url=string auth_url to connect to Mistral",
+        "required": "1",
+        "shortdesc": "auth_url to connect to Mistral",
+        "default": "",
+        "order": 5,
+    }
+    all_opt["wf_name"] = {
+        "getopt": "w:",
+        "longopt": "wf_name",
+        "help": "-w, --wf_name=string Workflow name to run by Mistral",
+        "required": "1",
+        "shortdesc": "Workflow name to run by Mistral",
+        "default": "",
+        "order": 5,
+    }
+
+
+def format_message(host, on_shared_storage):
+    result = {
+        "search_opts": {
+            "host": host
+        },
+        "on_shared_storage": on_shared_storage,
+        "flavor_extra_specs": {
+            "evacuation:evacuate": True
+        }
+    }
+    return result
+
+
+def evacuate(host, options):
+    user = options["--user"]
+    password = options["--password"]
+    tenant = options["--tenant"]
+    auth_url = options["--auth_url"]
+    wf_name = options["--wf_name"]
+
+    input_json = format_message(host, False)
+
+    mistral = client.client(
+        username=user,
+        api_key=password,
+        project_name=tenant,
+        auth_url=auth_url
+    )
+
+    mistral.executions.create(wf_name,
+                              input_json)
+
+
+def main():
+    atexit.register(atexit_handler)
+
+    device_opt = ["user", "domain", "password", "tenant", "auth_url",
+                  "wf_name", "port"]
+    define_new_opts()
+    all_opt["shell_timeout"]["default"] = "180"
+
+    options = check_input(device_opt, process_input(device_opt))
+
+    docs = {}
+    docs["shortdesc"] = "Fence agent for nova compute nodes"
+    docs["longdesc"] = "fence_evacuate is a Nova fencing notification agent"
+    docs["vendorurl"] = ""
+
+    show_docs(options, docs)
+    run_delay(options)
+
+    host = None
+    # Potentially we should make this a pacemaker feature
+    if options["--domain"] != "" and "--plug" in options:
+        options["--plug"] = options["--plug"] + "." + options["--domain"]
+
+    if "--plug" in options:
+        host = options["--plug"]
+
+    if options['--action'] in ['reboot', 'off']:
+        if host is None:
+            logging.error('No host specified')
+            sys.exit(1)
+
+        evacuate(host, options)
+        logging.error('Cannot connect to mistral')
+        sys.exit(1)
+
+    sys.exit(0)
+
+if __name__ == "__main__":
+    main()