本例将读取 ArcGIS Server 日志并报告由某一指定地图服务所绘制的地图图像的统计数据。要测试本例,请执行以下操作:
- 将 ArcGIS Server 日志级别设置为精细 (FINE)。
- 发布一个新的地图服务(无需定义切片缓存)。
- 使用 ArcMap 或服务目录平移和缩放地图服务。
- 运行脚本,输入服务器名称和凭据(当提示时)以及地图服务的名称。
您会看到一个打印输出,此输出报告了每个所绘地图的长度以及所绘地图的平均长度。
请注意,日志将以 JSON 形式返回,JSON 可通过使用 json.loads() 反序列化到 Python。随后,您可以遍历对象并读取或报告所需的任何项目。
# Queries the logs to find the average draw time for a given map service
# For Http calls
import httplib, urllib, json
# 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 queries the ArcGIS Server logs."
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
# Ask for map service name
mapService = raw_input("Enter map service name, using a forward slash / to denote a folder: ")
if mapService.endswith(".MapServer"):
pass
else:
mapService += ".MapServer"
# 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 query the logs
logQueryURL = "/arcgis/admin/logs/query"
logFilter = "{'services': ['" + mapService + "']}"
# Supply the log level, filter, token, and return format
params = urllib.urlencode({'level': 'FINE', 'filter': logFilter, '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", logQueryURL, params, headers)
# Read response
response = httpConn.getresponse()
if (response.status != 200):
httpConn.close()
print "Error while querying logs."
return
else:
data = response.read()
# Check that data returned is not an error object
if not assertJsonSuccess(data):
print "Error returned by operation. " + data
else:
print "Operation completed successfully!"
# Deserialize response into Python object
dataObj = json.loads(data)
httpConn.close()
# Need these variables to calculate average draw time for an ExportMapImage call
mapDraws = 0
totalDrawTime = 0
# Iterate over messages
for item in dataObj["logMessages"]:
if item["message"] == "End ExportMapImage":
print "Server drew map in " + item["elapsed"] + " seconds."
mapDraws +=1
totalDrawTime += float(item["elapsed"])
print "Total number of draws found in logs: " + str(mapDraws)
if mapDraws == 0:
return
print "Average draw time: " + str(1.0*(totalDrawTime / mapDraws)) + " seconds."
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"
# 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 toke 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:]))