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validateChangeScript.py
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validateChangeScript.py
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import sys
import yaml
import jinja2
import yamlordereddictloader
import jinja2schema
from jinja2schema import model
from termcolor import colored
changeList={}
changeGroupList={}
def run(rollerScript):
global changeList
global changeGoupList
validateChangeScript(rollerScript, "deploy")
changeList={}
changeGroupList={}
validateChangeScript(rollerScript, "rollback")
def validateChangeScript(rollerScript, operation, parentChange={}, parentChangeGroup={}, depth=0, data={}):
changeScript = yaml.load(file(rollerScript,'r'), Loader=yamlordereddictloader.Loader)
changeGroups=changeScript["changeGroups"]
if operation == "deploy":
for changeGroup in changeGroups:
for change in changeGroup["changes"]:
validateChange(change, changeGroup, operation, parentChange, parentChangeGroup, depth, rollerScript, data)
elif operation == "rollback":
for changeGroup in reversed(changeGroups):
for change in reversed(changeGroup["changes"]):
validateChange(change, changeGroup, operation, parentChange, parentChangeGroup, depth, rollerScript, data)
def validateChange(change, changeGroup, operation, parentChange={}, parentChangeGroup={}, depth=0, rollerScript=None, data={}):
if "name" in change:
name=change["name"]
if "name" in changeGroup:
groupName=changeGroup["name"]
if "name" in parentChange:
parentName=parentChange["name"]
else:
parentName=""
if "name" in parentChangeGroup:
parentGroupName=parentChangeGroup["name"]
else:
parentGroupName=""
change_id = name + "_" + groupName + "_" + parentName + "_" + parentGroupName + "_" + rollerScript
group_id = groupName + "_" + parentName + "_" + parentGroupName + "_" + rollerScript
if change_id in changeList:
if depth == changeList[change_id]:
print "Duplicate change name " + name + " in change group " + groupName + " of change script " + rollerScript
sys.exit(5)
else:
print "Circular reference of change script " + rollerScript
sys.exit(6)
else:
changeList[change_id]=depth;
if group_id in changeGroupList:
print "Duplicate group name " + groupName + " in " + rollerScript
sys.exit(7)
if "target" in change:
target=change["target"]
elif "target" in changeGroup:
target=changeGroup["target"]
elif "target" in parentChange:
target=parentChange["target"]
elif "target" in parentChangeGroup:
target=parentChangeGroup["target"]
else:
target=None
if "deploy" in change:
deploy=change["deploy"]
elif "deploy" in changeGroup:
deploy=changeGroup["deploy"]
elif "deploy" in parentChange:
deploy=parentChange["deploy"]
elif "deploy" in parentChangeGroup:
deploy=parentChangeGroup["deploy"]
else:
deploy=None
if "rollback" in change:
rollback=change["rollback"]
elif "rollback" in changeGroup:
rollback=changeGroup["rollback"]
elif "rollback" in parentChange:
rollback=parentChange["rollback"]
elif "rollback" in parentChangeGroup:
rollback=parentChangeGroup["rollback"]
else:
rollback=None
if "capture" in change:
capture=change["capture"]
elif "capture" in changeGroup:
capture=changeGroup["capture"]
elif "capture" in parentChange:
capture=parentChange["capture"]
elif "capture" in parentChangeGroup:
capture=parentChangeGroup["capture"]
else:
capture=None
if "deploySuccessIf" in change:
deploySuccessIf=change["deploySuccessIf"]
elif "deploySuccessIf" in changeGroup:
deploySuccessIf=changeGroup["deploySuccessIf"]
elif "deploySuccessIf" in parentChange:
deploySuccessIf=parentChange["deploySuccessIf"]
elif "deploySuccessIf" in parentChangeGroup:
deploySuccessIf=parentChangeGroup["deploySuccessIf"]
else:
deploySuccessIf=None
if "rollbackSuccessIf" in change:
rollbackSuccessIf=change["rollbackSuccessIf"]
elif "rollbackSuccessIf" in changeGroup:
rollbackSuccessIf=changeGroup["rollbackSuccessIf"]
elif "rollbackSuccessIf" in parentChange:
rollbackSuccessIf=parentChange["rollbackSuccessIf"]
elif "rollbackSuccessIf" in parentChangeGroup:
rollbackSuccessIf=parentChangeGroup["rollbackSuccessIf"]
else:
rollbackSuccessIf=None
if "deploySkipIf" in change:
deploySkipIf=change["deploySkipIf"]
elif "deploySkipIf" in changeGroup:
deploySkipIf=changeGroup["deploySkipIf"]
elif "deploySkipIf" in parentChange:
deploySkipIf=parentChange["deploySkipIf"]
elif "deploySkipIf" in parentChangeGroup:
deploySkipIf=parentChangeGroup["deploySkipIf"]
else:
deploySkipIf=None
if "rollbackSkipIf" in change:
rollbackSkipIf=change["rollbackSkipIf"]
elif "rollbackSkipIf" in changeGroup:
rollbackSkipIf=changeGroup["rollbackSkipIf"]
elif "rollbackSkipIf" in parentChange:
rollbackSkipIf=parentChange["rollbackSkipIf"]
elif "rollbackSkipIf" in parentChangeGroup:
rollbackSkipIf=parentChangeGroup["rollbackSkipIf"]
else:
rollbackSkipIf=None
if "data" in parentChangeGroup:
data.update(parentChangeGroup["data"])
if "data" in parentChange:
data.update(parentChange["data"])
if "data" in changeGroup:
data.update(changeGroup["data"])
if "data" in change:
data.update(change["data"])
if "include" in change:
includeScript=change["include"]
elif "include" in changeGroup:
includeScript=changeGroup["include"]
else:
includeScript=None
# Nested changeScripts : including changeScripts in changeScripts
# BEGIN
# Recursive processing of nested changeScripts
if includeScript != None:
validateChangeScript(includeScript, operation, change, changeGroup, depth+1, data)
return
# END
# Do nothing if a change contains no include, deploy or rollback
# BEGIN
if deploy == None:
if rollback == None:
return
# END
# Execute capture before change
# BEGIN
captureData={}
if capture != None:
for captureKey, captureValue in capture.iteritems():
undefinedVariables=jinja2schema.infer(captureValue)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(dataNotDefined(key,value,data), 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
captureData[captureKey]={ 'pre': { 'out': "<stdout>", 'err': "<stderr>", 'ret': "<return code>" } }
data.update(captureData)
# END
if operation == "rollback" and rollback != None and rollbackSkipIf != None:
rollbackSkipIf=jinja2.Template("{{ " + rollbackSkipIf + " }}").render(data)
undefinedVariables=jinja2schema.infer(rollbackSkipIf)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(key, 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
elif operation == "deploy" and deploy !=None and deploySkipIf != None :
deploySkipIf=jinja2.Template("{{ " + deploySkipIf + " }}").render(data)
undefinedVariables=jinja2schema.infer(deploySkipIf)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(key, 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
# For situations where the value of a variable would contain a jinja2 reference to another variable
# BEGIN
# Rendering jinja2 repeatedly until no change observed on further rendering
if operation == "deploy" and deploy !=None:
deploy=jinja2.Template(deploy).render(data)
prev=""
while prev!=deploy:
prev=deploy
deploy=jinja2.Template(deploy).render(data)
undefinedVariables=jinja2schema.infer(deploy)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(key, 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
if operation == "rollback" and rollback != None:
rollback=jinja2.Template(rollback).render(data)
prev=""
while prev!=rollback:
prev=rollback
rollback=jinja2.Template(rollback).render(data)
undefinedVariables=jinja2schema.infer(rollback)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(key, 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
else:
print value
# END
# For executing the change
# BEGIN
# Generating the execution script for the change, granting execute on it and executing it
deployData={}
rollbackData={}
if operation == "rollback" and rollback != None:
rollbackData['rollback']={ 'out': "<stdout>", 'err': "<stderr>", 'ret': "<return code>" }
data.update(rollbackData)
elif operation == "deploy" and deploy !=None:
deployData['deploy']={ 'out': "<stdout>", 'err': "<stderr>", 'ret': "<return code>" }
data.update(deployData)
# END
# Execute capture after change
# BEGIN
if capture != None:
for captureKey, captureValue in capture.iteritems():
captureValue=jinja2.Template(captureValue).render(data)
undefinedVariables=jinja2schema.infer(captureValue)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(key, 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
captureData[captureKey].update({ 'post': { 'out': "<stdout>", 'err': "<stderr>", 'ret': "<return code>" } })
data.update(captureData)
# END
if operation == "rollback" and rollback != None and rollbackSuccessIf != None:
rollbackSuccessIf=jinja2.Template("{{ " + rollbackSuccessIf + " }}").render(data)
undefinedVariables=jinja2schema.infer(rollbackSuccessIf)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(key, 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
elif operation == "deploy" and deploy !=None and deploySuccessIf != None:
deploySuccessIf=jinja2.Template("{{ " + deploySuccessIf + " }}").render(data)
undefinedVariables=jinja2schema.infer(deploySuccessIf)
for key,value in undefinedVariables.iteritems():
if dataNotDefined(key,value,data):
print "Variable " + colored(key, 'red', attrs=['bold']) + " not defined for " + colored(captureValue, 'cyan', attrs=['bold']) + " in " + colored(name + " : " + groupName + " : " + rollerScript, 'green', attrs=['bold'])
sys.exit(4)
def dataNotDefined(key,value,data, prev=""):
if key not in data:
return prev + key
elif type(value) == model.Scalar:
return False
else:
for k, v in value.iteritems():
return dataNotDefined(k, v, data[key], prev + key + ".")