Quizá desee un control preciso de las propiedades del servicio cuando publique inicialmente 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 = 6443 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:]))