enh(tests): new test to check host_parent

tests/broker-engine/bbdo-protobuf.robot

@@ -246,3 +246,43 @@ BEPB_SERVICE_DEPENDENCY
     Should Be Equal As Strings    ${output}    ()    host dependency not deleted from database
 
     [Teardown]    Stop Engine Broker And Save Logs    True
+
+BEPBHostParent
+    [Documentation]    bbdo_version 3 communication of host parent relations
+    [Tags]    broker    engine    protobuf    bbdo
+    Config Engine    ${1}
+    Add Parent To Host    0    host_1    host_2
+    Config Broker    central
+    Config BBDO3    ${1}
+    Broker Config Log    central    sql    trace
+    Config Broker Sql Output    central    unified_sql
+    Clear Retention
+    ${start}    Get Current Date
+    Start Broker    True
+    Start Engine
+    Connect To Database    pymysql    ${DBName}    ${DBUser}    ${DBPass}    ${DBHost}    ${DBPort}
+
+    FOR    ${index}    IN RANGE    30
+        ${output}    Query
+        ...    SELECT child_id, parent_id FROM hosts_hosts_parents
+        Log To Console    ${output}
+        Sleep    1s
+        IF    "${output}" == "((1, 2),)"    BREAK
+    END
+    Should Be Equal As Strings    ${output}    ((1, 2),)    host parent not inserted
+
+    # remove host
+    Config Engine    ${1}
+    Reload Broker    True
+    Reload Engine
+
+    FOR    ${index}    IN RANGE    30
+        ${output}    Query
+        ...    SELECT child_id, parent_id FROM hosts_hosts_parents
+        Log To Console    ${output}
+        Sleep    1s
+        IF    "${output}" == "()"    BREAK
+    END
+    Should Be Equal As Strings    ${output}    ()    host parent not deleted
+
+    [Teardown]    Stop Engine Broker And Save Logs    True

tests/resources/Engine.py

@@ -2481,6 +2481,28 @@ def remove_tags_from_hosts(poller: int, type: str):
         ff.writelines(lines)
 
 
+def add_parent_to_host(poller: int, host: str, parent_host: str):
+    """
+    Add a parent host to an host.
+
+    Args:
+        poller: index of the Engine configuration (from 0)
+        host: child host name.
+        parent_host: host name of the parent of the child host.
+    """
+    with open(f"{CONF_DIR}/config{poller}/hosts.cfg", "r") as ff:
+        lines = ff.readlines()
+    r = re.compile(rf"^\s*host_name\s+{host}$")
+    for i in range(len(lines)):
+        if r.match(lines[i]):
+            lines.insert(
+                i + 1, f"    parents                        {parent_host}\n")
+            break
+
+    with open(f"{CONF_DIR}/config{poller}/hosts.cfg", "w") as ff:
+        ff.writelines(lines)
+
+
 def add_template_to_services(poller: int, tmpl: str, svc_lst):
     """
     Add a service template to services.

tests/resources/resources.resource

@@ -84,8 +84,9 @@ Restart Broker
     Start Broker    ${only_central}
 
 Reload Broker
+    [Arguments]    ${only_central}=False
     Send Signal To Process    SIGHUP    b1
-    Send Signal To Process    SIGHUP    b2
+    IF    not ${only_central}    Send Signal To Process    SIGHUP    b2
 
 Kindly Stop Broker
     [Arguments]    ${only_central}=False