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# MIB modules management
from types import InstanceType
from pysnmp.smi import error
__all__ = [ 'MibInstrumController' ]
class MibInstrumController:
fsmReadVar = {
# ( state, status ) -> newState
('start', 'ok'): 'readTest',
('readTest', 'ok'): 'readGet',
('readGet', 'ok'): 'stop',
('*', 'err'): 'stop'
}
fsmReadNextVar = {
# ( state, status ) -> newState
('start', 'ok'): 'readTestNext',
('readTestNext', 'ok'): 'readGetNext',
('readGetNext', 'ok'): 'stop',
('*', 'err'): 'stop'
}
fsmWriteVar = {
# ( state, status ) -> newState
('start', 'ok'): 'writeTest',
('writeTest', 'ok'): 'writeCommit',
('writeCommit', 'ok'): 'writeCleanup',
('writeCleanup', 'ok'): 'readTest',
# Do read after successful write
('readTest', 'ok'): 'readGet',
('readGet', 'ok'): 'stop',
# Error handling
('writeTest', 'err'): 'writeCleanup',
('writeCommit', 'err'): 'writeUndo',
('writeUndo', 'ok'): 'readTest',
# Ignore read errors (removed columns)
('readTest', 'err'): 'stop',
('readGet', 'err'): 'stop',
('*', 'err'): 'stop'
}
def __init__(self, mibBuilder):
self.mibBuilder = mibBuilder
self.lastBuildId = -1
# MIB indexing
def __indexMib(self):
# Build a tree from MIB objects found at currently loaded modules
if self.lastBuildId == self.mibBuilder.lastBuildId:
return
( MibScalarInstance,
MibScalar,
MibTableColumn,
MibTableRow,
MibTable,
MibTree ) = self.mibBuilder.importSymbols(
'SNMPv2-SMI',
'MibScalarInstance',
'MibScalar',
'MibTableColumn',
'MibTableRow',
'MibTable',
'MibTree'
)
mibTree, = self.mibBuilder.importSymbols('SNMPv2-SMI', 'iso')
#
# Management Instrumentation gets organized as follows:
#
# MibTree
# |
# +----MibScalar
# | |
# | +-----MibScalarInstance
# |
# +----MibTable
# |
# +----MibTableRow
# |
# +-------MibTableColumn
# |
# +------MibScalarInstance(s)
#
# Mind you, only Managed Objects get indexed here, various MIB defs and
# constants can't be SNMP managed so we drop them.
#
scalars = {}; instances = {}; tables = {}; rows = {}; cols = {}
# Sort by module name to give user a chance to slip-in
# custom MIB modules (that would sorted out first)
mibSymbols = self.mibBuilder.mibSymbols.items()
mibSymbols.sort(lambda x,y: cmp(y[0], x[0]))
for modName, mibMod in mibSymbols:
for symObj in mibMod.values():
if type(symObj) != InstanceType:
continue
if isinstance(symObj, MibTable):
tables[symObj.name] = symObj
elif isinstance(symObj, MibTableRow):
rows[symObj.name] = symObj
elif isinstance(symObj, MibTableColumn):
cols[symObj.name] = symObj
elif isinstance(symObj, MibScalarInstance):
instances[symObj.name] = symObj
elif isinstance(symObj, MibScalar):
scalars[symObj.name] = symObj
# Attach Managed Objects Instances to Managed Objects
for inst in instances.values():
if scalars.has_key(inst.typeName):
scalars[inst.typeName].registerSubtrees(inst)
elif cols.has_key(inst.typeName):
cols[inst.typeName].registerSubtrees(inst)
else:
raise error.SmiError(
'Orphan MIB scalar instance %s at %s' % (inst, self)
)
# Attach Table Columns to Table Rows
for col in cols.values():
rowName = col.name[:-1] # XXX
if rows.has_key(rowName):
rows[rowName].registerSubtrees(col)
else:
raise error.SmiError(
'Orphan MIB table column %s at %s' % (col, self)
)
# Attach Table Rows to MIB tree
for row in rows.values():
mibTree.registerSubtrees(row)
# Attach Tables to MIB tree
for table in tables.values():
mibTree.registerSubtrees(table)
# Attach Scalars to MIB tree
for scalar in scalars.values():
mibTree.registerSubtrees(scalar)
self.lastBuildId = self.mibBuilder.lastBuildId
# MIB instrumentation
def flipFlopFsm(self, fsmTable, inputNameVals, (acFun, acCtx)):
self.__indexMib()
mibTree, = self.mibBuilder.importSymbols('SNMPv2-SMI', 'iso')
outputNameVals = []
state, status = 'start', 'ok'
myErr = None
while 1:
fsmState = fsmTable.get((state, status))
if fsmState is None:
fsmState = fsmTable.get(('*', status))
if fsmState is None:
raise error.SmiError(
'Unresolved FSM state %s, %s' % (state, status)
)
state = fsmState
status = 'ok'
if state == 'stop':
break
idx = 0
for name, val in inputNameVals:
f = getattr(mibTree, state, None)
if f is None:
raise error.SmiError(
'Unsupported state handler %s at %s' % (state, self)
)
try:
# Convert to tuple to avoid ObjectName instantiation
# on subscription
rval = f(tuple(name), val, idx, (acFun, acCtx))
except error.SmiError, why:
if myErr is None: # Take the first exception
myErr = why
status = 'err'
break
else:
if rval is not None:
outputNameVals.append((rval[0], rval[1]))
idx = idx + 1
if myErr:
raise myErr
return outputNameVals
def readVars(self, vars, (acFun, acCtx)=(None, None)):
return self.flipFlopFsm(self.fsmReadVar, vars, (acFun, acCtx))
def readNextVars(self, vars, (acFun, acCtx)=(None, None)):
return self.flipFlopFsm(self.fsmReadNextVar, vars, (acFun, acCtx))
def writeVars(self, vars, (acFun, acCtx)=(None, None)):
return self.flipFlopFsm(self.fsmWriteVar, vars, (acFun, acCtx))
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