cc-2419: media monitor import on start

-initial check-in

python_apps/media-monitor/airtimefilemonitor/airtimemediamonitorbootstrap.py

@@ -0,0 +1,74 @@
+import os
+
+from subprocess import Popen, PIPE
+
+
+class AirtimeMediaMonitorBootstrap():
+
+    def __init__(self, logger):
+        self.logger = logger
+        
+    """
+    on bootup we want to scan all directories and look for files that
+    weren't there or files that changed before media-monitor process
+    went offline. We can do this by doing a hash of the directory metadata.
+    """
+    def scan(self):
+        directories = ['/srv/airtime/stor']
+        
+        for dir in directories:
+            self.check_for_diff(dir)
+            
+    def check_for_diff(self, dir):
+        airtime_tmp = '/var/tmp/airtime'
+    
+        if os.path.exists(airtime_tmp + '/.airtime_media_index'):
+            #a previous index exists, we can do a diff between this
+            #file and the current state to see whether anything has
+            #changed.
+            self.logger.info("Previous index file found.")
+            
+                
+            #find files that have been modified since the last time
+            #media-monitor process was running.
+            command = "find %s -type f -iname '*.ogg' -o -iname '*.mp3' -readable -mmin -30" % dir
+            stdout = self.execCommandAndReturnStdOut(command)
+            self.logger.info("Files modified since last checkin: \n%s\n", stdout)
+            
+            
+            #find deleted files
+            command = "find %s -type f -iname '*.ogg' -o -iname '*.mp3' -readable > %s/.airtime_media_index.tmp" % (dir, airtime_tmp)
+            self.execCommand(command)
+            
+            command = "diff %s/.airtime_media_index.tmp %s/.airtime_media_index" % (airtime_tmp, airtime_tmp)
+            stdout = self.execCommandAndReturnStdOut(command)
+            self.logger.info("Deleted files since last checkin:\n%s\n", stdout)
+            
+        else:
+            #a previous index does not exist. Most likely means that 
+            #media monitor has never seen this directory before. Let's
+            #notify airtime server about each of these files
+            self.logger.info("Previous index file does not exist. Creating a new one")
+            
+            #create a new index file.
+            command = "find %s -type f -iname '*.ogg' -o -iname '*.mp3' -readable > %s/.airtime_media_index" % (dir, airtime_tmp)
+            self.execCommand(command)
+                
+    def execCommand(self, command):
+        p = Popen(command, shell=True)
+        sts = os.waitpid(p.pid, 0)[1]
+        if sts != 0:
+            self.logger.warn("command \n%s\n return with a non-zero return value", command)        
+                
+    def execCommandAndReturnStdOut(self, command):
+        p = Popen(command, shell=True, stdout=PIPE)
+        stdout = p.communicate()[0]
+        if p.returncode != 0:
+            self.logger.warn("command \n%s\n return with a non-zero return value", command)
+        return stdout
+                       
+        
+if __name__ == '__main__':
+    
+        mmb = AirtimeMediaMonitorBootstrap()
+        mmb.scan()