Support providing console log lines from API

client-api/api_lib/pvcapi_helper.py

@@ -305,6 +305,35 @@ def vm_node(vm):
     pvc_common.stopZKConnection(zk_conn)
     return retdata, retcode
 
+def vm_console(vm, lines=None):
+    """
+    Return the current console log for VM.
+    """
+    # Default to 10 lines of log if not set
+    if not lines:
+        lines = 10
+
+    zk_conn = pvc_common.startZKConnection(config['coordinators'])
+    retflag, retdata = pvc_vm.get_console_log(zk_conn, vm, lines)
+
+    if retflag:
+        if retdata:
+            retcode = 200
+            retdata = {
+                'name': vm,
+                'data': retdata
+            }
+        else:
+            retcode = 404
+            retdata = {
+                'message': 'VM not found.'
+            }
+    else:
+        retcode = 400
+
+    pvc_common.stopZKConnection(zk_conn)
+    return retdata ,retcode
+
 def vm_list(node=None, state=None, limit=None, is_fuzzy=True):
     """
     Return a list of VMs with limit LIMIT.

client-api/pvc-api.py

@@ -1292,6 +1292,49 @@ class API_VM_Locks(Resource):
         return api_helper.vm_flush_locks(vm)
 api.add_resource(API_VM_Locks, '/vm/<vm>/locks')
 
+# /vm/<vm</console
+class API_VM_Console(Resource):
+    @RequestParser([
+        { 'name': 'lines' }
+    ])
+    @Authenticator
+    def get(self, vm, reqargs):
+        """
+        Return the recent console log of {vm}
+        ---
+        tags:
+          - vm
+        responses:
+          200:
+            description: OK
+            schema:
+              type: object
+              id: VMLog
+              properties:
+                name:
+                  type: string
+                  description: The name of the VM
+                data:
+                  type: string
+                  description: The recent console log text
+        parameters:
+          - in: query
+            name: lines
+            type: integer
+            required: false
+            description: The number of lines to retrieve
+          404:
+            description: Not found
+            schema:
+              type: object
+              id: Message
+        """
+        return api_helper.vm_console(
+            vm,
+            int(reqargs.get('lines', None))
+        )
+api.add_resource(API_VM_Console, '/vm/<vm>/console')
+
 
 ##########################################################
 # Client API - Network

client-common/vm.py

@@ -564,19 +564,13 @@ def get_console_log(zk_conn, domain, lines=1000):
 
     # Get the data from ZK
     console_log = zkhandler.readdata(zk_conn, '/domains/{}/consolelog'.format(dom_uuid))
+    print(lines)
 
     # Shrink the log buffer to length lines
     shrunk_log = console_log.split('\n')[-lines:]
     loglines = '\n'.join(shrunk_log)
 
-    # Show it in the pager (less)
-    try:
-        pager = subprocess.Popen(['less', '-R'], stdin=subprocess.PIPE)
-        pager.communicate(input=loglines.encode('utf8'))
-    except FileNotFoundError:
-        return False, 'ERROR: The "less" pager is required to view console logs.'
-
-    return True, ''
+    return True, loglines
 
 def follow_console_log(zk_conn, domain, lines=10):
     # Validate that VM exists in cluster