Beispiel: Überprüfen eines Ordners auf beendete Services

Mit diesem Skript werden alle Services in einem ArcGIS for Server-Ordner daraufhin geprüft, ob sie beendet oder gestartet wurden. Zu jedem beendeten Service wird eine Meldung angezeigt. Dieses Skript kann regelmäßig als Statusprüfung ausgeführt werden, wobei die Meldungen per E-Mail versendet oder in einer Protokolldatei aufgezeichnet werden können.

Wenn Sie mit der ArcGIS-REST-API den Status von Services prüfen, erhalten Sie sowohl Informationen zum konfigurierten Status als auch zum Echtzeitstatus. Der konfigurierte Status ist der Status, den Sie in ArcGIS for Server konfiguriert haben, also der Status, den Sie unter normalen Bedingungen erwarten. Der Echtzeitstatus zeigt, ob der Service tatsächlich funktioniert und hilft Ihnen bei der Suche nach unterbrochenen Services. Mit diesem Skript wird der Echtzeitstatus geprüft.

# Demonstrates how to check a folder for stopped services and print them.
# The messages could alternatively be written to an e-mail or log file.
# This script could be scheduled to run at a regular interval.

# For Http calls
import httplib, urllib, json

# For system tools
import sys, datetime

# For reading passwords without echoing
import getpass

# Defines the entry point into the script
def main(argv=None):
    # Print some info
    print
    print "This tool is a sample script that detects stopped services in a folder."
    print  
    
    # Ask for admin/publisher user name and password
    username = raw_input("Enter user name: ")
    password = getpass.getpass("Enter password: ")
    
    # Ask for server name
    serverName = raw_input("Enter server name: ")
    serverPort = 6080

    folder = raw_input("Enter the folder name or ROOT for the root location: ")

    # Create a list to hold stopped services
    stoppedList = []
    
    # Get a token
    token = getToken(username, password, serverName, serverPort)
    if token == "":
        print "Could not generate a token with the username and password provided."
        return
    
    # Construct URL to read folder
    if str.upper(folder) == "ROOT":
        folder = ""
    else:
        folder += "/"
            
    folderURL = "/arcgis/admin/services/" + folder
    
    # This request only needs the token and the response formatting parameter 
    params = urllib.urlencode({'token': token, 'f': 'json'})
    
    headers = {"Content-type": "application/x-www-form-urlencoded", "Accept": "text/plain"}
    
    # Connect to URL and post parameters    
    httpConn = httplib.HTTPConnection(serverName, serverPort)
    httpConn.request("POST", folderURL, params, headers)
    
    # Read response
    response = httpConn.getresponse()
    if (response.status != 200):
        httpConn.close()
        print "Could not read folder information."
        return
    else:
        data = response.read()
        
        # Check that data returned is not an error object
        if not assertJsonSuccess(data):          
            print "Error when reading folder information. " + str(data)
        else:
            print "Processed folder information successfully. Now processing services..."

        # Deserialize response into Python object
        dataObj = json.loads(data)
        httpConn.close()

        # Loop through each service in the folder and stop or start it    
        for item in dataObj['services']:

            fullSvcName = item['serviceName'] + "." + item['type']

            # Construct URL to stop or start service, then make the request                
            statusURL = "/arcgis/admin/services/" + folder + fullSvcName + "/status"
            httpConn.request("POST", statusURL, params, headers)
            
            # Read status response
            statusResponse = httpConn.getresponse()
            if (statusResponse.status != 200):
                httpConn.close()
                print "Error while checking status for " + fullSvcName
                return
            else:
                statusData = statusResponse.read()
                              
                # Check that data returned is not an error object
                if not assertJsonSuccess(statusData):
                    print "Error returned when retrieving status information for " + fullSvcName + "."
                    print str(statusData)

                else:
                    # Add the stopped service and the current time to a list
                    statusDataObj = json.loads(statusData)
                    if statusDataObj['realTimeState'] == "STOPPED":
                        stoppedList.append([fullSvcName,str(datetime.datetime.now())])
                                  
            httpConn.close()           

    # Check number of stopped services found
    if len(stoppedList) == 0:
        print "No stopped services detected in folder " + folder.rstrip("/")
    else:
        # Write out all the stopped services found
        # This could alternatively be written to an e-mail or a log file
        for item in stoppedList:
            print "Service " + item[0] + " was detected to be stopped at " + item[1]    

    return


# A function to generate a token given username, password and the adminURL.
def getToken(username, password, serverName, serverPort):
    # Token URL is typically http://server[:port]/arcgis/admin/generateToken
    tokenURL = "/arcgis/admin/generateToken"
    
    params = urllib.urlencode({'username': username, 'password': password, 'client': 'requestip', 'f': 'json'})
    
    headers = {"Content-type": "application/x-www-form-urlencoded", "Accept": "text/plain"}
    
    # Connect to URL and post parameters
    httpConn = httplib.HTTPConnection(serverName, serverPort)
    httpConn.request("POST", tokenURL, params, headers)
    
    # Read response
    response = httpConn.getresponse()
    if (response.status != 200):
        httpConn.close()
        print "Error while fetching tokens from admin URL. Please check the URL and try again."
        return
    else:
        data = response.read()
        httpConn.close()
        
        # Check that data returned is not an error object
        if not assertJsonSuccess(data):            
            return
        
        # Extract the token from it
        token = json.loads(data)        
        return token['token']            
        

# A function that checks that the input JSON object 
#  is not an error object.
def assertJsonSuccess(data):
    obj = json.loads(data)
    if 'status' in obj and obj['status'] == "error":
        print "Error: JSON object returns an error. " + str(obj)
        return False
    else:
        return True
    
        
# Script start
if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))