Ejemplo: Publicar un servicio con parámetros detallados

En ocasiones, quizá desee control detallado de las propiedades del servicio cuando se publique un servicio. Puede lograr esto mediante la lista de parámetros de servicio en un archivo de texto utilizando la notación de objetos de JavaScript (JSON). Después puede llamar al método createService en la API REST de ArcGIS y pasar la notación JSON que ha leído en el archivo.

En el caso de un servicio de mapas, debe especificar una definición del servicio de mapas (MSD) archivo en su JSON. Este archivo sintetiza información de su documento de ArcMap (MXD) en un formato que puede entenderse y dibujar por ArcGIS Server. Debe utilizar el módulo arcpy.mapping para analizar el mapa y crear el MSD antes de poder seguir adelante con la creación del servicio. Esta parte requiere un equipo con licencia para ArcGIS Desktop. Otros tipos de servicios no requieren que utilice arcpy.mapping o crear un MSD.

Aquí tiene un ejemplo de cómo es el archivo JSON. Consulte la referencia de API REST de ArcGIS para obtener ejemplos detallados de cómo crear el archivo JSON para distintos tipos de servicios.

{  "serviceName": "Beirut",  "type": "MapServer",  "description": "Service showing Beirut parcels and streets.",  "capabilities": "Map,Query,Data",  "clusterName": "default",  "minInstancesPerNode": 1,  "maxInstancesPerNode": 3,  "instancesPerContainer": 1,  "maxWaitTime": 60,  "maxStartupTime": 300,  "maxIdleTime": 1800,  "maxUsageTime": 600,  "loadBalancing": "ROUND_ROBIN",  "isolationLevel": "HIGH",  "configuredState": "STARTED",  "recycleInterval": 24,  "recycleStartTime": "00:00",  "keepAliveInterval": 1800,  "private": false,  "isDefault": false,  "properties": {    "maxBufferCount": "100",    "maxImageHeight": "2048",    "maxRecordCount": "1000",    "filePath": "c:\\data\\Beirut\\Beirut_Parcels.msd",    "maxImageWidth": "2048",    "enableDynamicLayers": "false",    "cacheOnDemand": "false",    "dynamicDataWorkspaces": "",    "useLocalCacheDir": "true",    "outputDir": "c:\\arcgisserver\\directories\\arcgisoutput",    "virtualOutputDir": "/rest/directories/arcgisoutput",    "supportedImageReturnTypes": "URL",    "isCached": "false",    "ignoreCache": "false",    "clientCachingAllowed": "true",    "cacheDir": ""  },  "extensions": [],  "datasets": []}

El código a continuación muestra cómo se podría hacer referencia al contenido de este archivo JSON en una secuencia de comandos de Python cuando publica un servicio.

# Demonstrates how to publish a service from a JSON definition file
# An MSD file is required, which is made from the MXD in this script

# For Http calls
import httplib, urllib, json, arcpy, os

# For system tools
import sys

# 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 publishes a service using an MXD and JSON definiton."
    print
    
    # Ask for admin/publisher user name and password
    username = raw_input("Enter user name: ")
    password = getpass.getpass("Enter password: ")

    # Ask for other necessary information
    serverName = raw_input("Enter Server name: ")
    serverPort = 6080
    mxdPath = raw_input("Enter the path to the MXD: ")
    msdPath = raw_input("Enter the desired path for the MSD: ")
    jsonPath = raw_input("Enter the path to the JSON file: ")

    # Analyze MXD and create MSD file
    if not os.path.isfile(mxdPath):
        return

    if mxdPath.endswith('.mxd'):
        mapErrors = analyzeMap(mxdPath)
        if len(mapErrors) > 0:
            print "Fix map errors before converting to mxd"
            return
        mxd = arcpy.mapping.MapDocument(mxdPath)
        convertMap(mxd, msdPath);
        del mxd  
    else:
        print "Invalid file type submitted"
        return

    # Get a token
    token = getToken(username, password, serverName, serverPort)
    if token == "":
        print "Could not generate a token with the username and password provided."
        return

    # Read the JSON file for the service
    serviceJSON = open(jsonPath).read()
    
    # Construct URL to create a service
    # If publishing to a folder, invoke createService on the folder URL
    createServiceURL = "/arcgis/admin/services/createService"
    
    # This request needs the token, the JSON defining the service properties,
    #  and the response format 
    params = urllib.urlencode({'token': token, 'service':serviceJSON, '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", createServiceURL, params, headers)
    
    # Read response
    response = httpConn.getresponse()
    if (response.status != 200):
        httpConn.close()
        print "Error while creating the service."
        return
    else:
        data = response.read()
        httpConn.close()
        
        # Check that data returned is not an error object
        if not assertJsonSuccess(data):          
            print "Error returned by operation. " + data
        else:
            print "Operation completed successfully!"
        
        return

# A function to analyze a map document
def analyzeMap(mapPath):
    mxd = arcpy.mapping.MapDocument(mapPath)
    analysis = arcpy.mapping.AnalyzeForMSD(mxd)

    vars = analysis['errors']
    for ((message, code), layerlist) in vars.iteritems():
      print "Errors: "
      print message, " (CODE %i)" % code
      print "       applies to the following layers:",
      for layer in layerlist:
          print layer.name,
      print
        
    del mxd
    return analysis['errors']

# A function to convert a map document to a map service definition (MSD)
def convertMap(mxd, msd):
    arcpy.mapping.ConvertToMSD(mxd, msd, "USE_ACTIVE_VIEW", "NORMAL", "NORMAL")
    del mxd, msd

# 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"
    
    # URL-encode the token parameters
    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:]))