The REST API allows users to query the iQSonar results directly using the web client protocol. The results are returned in JSON format. This article is part of a series on how to make use of the Rest API.
This worked example uses Python to produce a list of hosts (devices) which have enterprise database applications. If the device has a database, we print off the host name, the total installed RAM and the CPU type; we then list the number and edition of the databases. The device name will be taken from the "device" results. For the CPU Type and the installed RAM we need to then go to the details page for the device; For the database details we then go into the applications page. Thus for each device we find, we make at least two and sometimes three REST API calls.
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python -m pip install -U pip requests |
Step One – Connect to the iQSonar Host
To access the REST-API we use HTTP with basic authentication. in Python we do this using the "requests" library. You must update this URL to reflect your host, and update the username and password to reflect the credentials for your instance of iQSonar. The "X-fetch-count" variable in the header tells us the total number of devices which have been scanned. In this example we will stop after the first 200 if the Scan Engine has scanned that many. You can look at some of the other worked examples in PowerShell for examples showing paging through the results.
The line "data = r.json()" takes the JSON results and parses it into a Python array variable.
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#!/usr/bin/python3
import requests
# Set this to your own host name/login/password)
r = requests.get('http://iqsonar-host/api/v1/devices',auth=('admin','password'))
max = r.headers['X-fetch-count']
data = r.json() |
The line "#!/usr/bin/python3" lets Python know that this is a Python 3 scriptthat this is a Python 3 script.
Note that if you have a problem with the credentials, Python will throw an exception when you attempt to access r.headers[]
See step three for an example of exception handling code.
Step Two – Iterate over the array of devices
At this point in the script, we have a variable data which contains the JSON output from the Rest API.
The data structure is a JSON array of objects, each object contains an array of device attributes:
- device_id
- host_name
- serial_number
- manufacturer
- model
- last_scan
- self
The "self" item is a link to the full details on the device.
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# set some counters
noapps=0
nodb = 0
gotone=0
count = len(data)
i = 0
while (i < count):
row = data[i]
gotone=0
if ( 'host_name' in row ):
hostname = row['host_name']
else:
hostname = '(no hostname)'
url2 = row['self']
r2 = requests.get(url2,auth=('admin','password'))
device = r2.json()
if ('total_memory_mb' in device):
ram = device['total_memory_mb']
else:
ram = '(unknown ram)'
if ('cpu' in device):
cpu = device['cpu'][0]['cpu_model']
# remove commas from the cpu string so as to keep the CSV output valid
cpu = cpu.replace(',','')
else:
cpu = '(unknown cpu)'
status = hostname + ': ' + str(ram) + 'MB RAM, ' + str(cpu)
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Step Three – Process the Applications link
One caveat - as of Elcano R2, the applications link exists even when the device does not have any scanned applications. Following the link in these cases results in an exception - so we use a TRY/CATCH block to work around this. While this was corrected in Fu R1 and subsequent releases, the exception handling method shown here is still a useful example of handling exceptions.
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# Having got Hostname, Ram and CPU, lets look for databases?
if ('applications' in device):
url3 = device['applications']
r3 = requests.get(url3,auth=('admin','password'))
# the URL might not be valid. If no applications, server will return a 500 error
try:
apps = r3.json()
except:
noapps += 1
else:
numapps = len(apps)
j=0
while (j < numapps):
# Deal with the application entries
j+=1 |
With each application, we're only interested if it is a database application... for any other application type we're going to ignore it.
The database name is stored in apps[j]['product']['name'], but not all applications have product names... hence the nested IF blocks to test if the variable is defined.
If the application name contains "SQL" (Microsoft SQL Server), "Oracle Database" or "Informix" then we want to list the application along with the edition. If the Application Description contains "DB2 Database" we know it is a DB2 database. We cannot search for DB2 on its own in the Product Name or else we find DB2 Connect as well, and DB2 databases are listed as DB2.
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#
while (j < numapps):
if ('product' in apps[j]):
if ('name' in apps[j]['product']):
if (('SQL' in apps[j]['product']['name']) or
('Oracle Database' in apps[j]['product']['name']) or
('Informix' in apps[j]['product']['name']) ):
status = status + '\n ' + str(apps[j]['product']['name'])
if ('edition' in apps[j]): status = status + ' '+ str(apps[j]['edition'])
else: status = status + ' (no edition info)'
gotone+=1
if ('DB2 Database' in apps[j]['product']['description']):
status = status + '\n ' + str(apps[j]['product']['name'])
if ('edition' in apps[j]): status = status + ' '+ str(apps[j]['edition'])
else: status = status + ' (no edition info)'
gotone+=1 |
Outside the loop, we want to only print results if the database has been discovered. If there was no database gotone will be 0, so we only print the status line where gotone is greater than zero.
The final test is to see whether we've got more results. Code to actually process more than one batch of devices is left as an exercise for the reader.
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#
if (gotone > 0):
print (status)
i+=1
if (max > count):
print( "There is another page of results in the REST-API if you want to get it" )
else:
print("That's all folks") |
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#!/usr/bin/python3
# RestAPI example in Python
#
import requests
# Set this to your own host name/login/password)
r = requests.get('http://iqsonar-host/api/v1/devices',auth=('admin','password'))
# set some counters
noapps=0
nodb = 0
gotone=0
max = r.headers['X-fetch-count']
data = r.json()
count = len(data)
i = 0
while (i < count):
row = data[i]
gotone=0
if ( 'host_name' in row ):
hostname = row['host_name']
else:
hostname = '(no hostname)'
url2 = row['self']
r2 = requests.get(url2,auth=('admin','password'))
device = r2.json()
if ('total_memory_mb' in device):
ram = device['total_memory_mb']
else:
ram = '(unknown ram)'
if ('cpu' in device):
cpu = device['cpu'][0]['cpu_model']
# remove commas from the cpu string so as to keep the CSV output valid
cpu = cpu.replace(',','')
else:
cpu = '(unknown cpu)'
status = hostname + ': ' + str(ram) + 'MB RAM, ' + str(cpu)
# Having got Hostname, Ram and CPU, lets look for databases?
if ('applications' in device):
url3 = device['applications']
r3 = requests.get(url3,auth=('admin','password'))
# the URL might not be valid. If no applications, server will return a 500 error
try:
apps = r3.json()
except:
noapps += 1
else:
numapps = len(apps)
j=0
while (j < numapps):
if ('product' in apps[j]):
if (('SQL' in apps[j]['product']['name']) or
('Oracle Database' in apps[j]['product']['name']) or
('Informix' in apps[j]['product']['name']) ):
status = status + '\n ' + str(apps[j]['product']['name'])
if ('edition' in apps[j]): status = status + ' '+ str(apps[j]['edition'])
else: status = status + ' (no edition info)'
gotone+=1
if ('DB2 Database' in apps[j]['product']['description']):
status = status + '\n ' + str(apps[j]['product']['name'])
if ('edition' in apps[j]): status = status + ' '+ str(apps[j]['edition'])
else: status = status + ' (no edition info)'
gotone+=1
j+=1
if (gotone > 0):
print (status)
i+=1
if (int(max) > count):
print( "There is another page of results in the REST-API if you want to get it" )
else:
print("That's all folks") |
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