Add `hlapi.v1arch` API (#186)

* Add `hlapi.v1arch` API

Introduce new sub-package `pysnmp.hlapi.v1arch` which
wraps otherwise very detailed packet-level SNMP
messaging into a handful of convenience functions.

As a side effect, the `pysnmp.hlapi.*` sub-packages
moved under `pysnmp.hlapi.v3arch` though `pysnmp.hlapi`
still exposes `pysnmp.hlappi.v3arch.*` symbols to
retain some degree of backward compatibility.

The signature of the hlapi `.sendNotification()` call
has changed to accept `*varBinds` instead of a sequence
of `varBinds`. The rationale is to unify this method
call with similar methods of CommandGenerator.

* Add v1arch docs and reshuffle hlapi docs

1 files changed, 44 insertions, 0 deletions

diff --git a/examples/hlapi/v1arch/asyncore/manager/cmdgen/pull-whole-mib.py b/examples/hlapi/v1arch/asyncore/manager/cmdgen/pull-whole-mib.py
new file mode 100644
index 00000000..c5731570
--- /dev/null
+++ b/examples/hlapi/v1arch/asyncore/manager/cmdgen/pull-whole-mib.py
@@ -0,0 +1,44 @@
+"""
+Walk whole MIB
+++++++++++++++
+
+Send a series of SNMP GETBULK requests using the following options:
+
+* with SNMPv2c, community 'public'
+* over IPv4/UDP
+* to an Agent at demo.snmplabs.com:161
+* for all OIDs past 1.3.6.1.4.1
+
+Functionally similar to:
+
+| $ snmpwalk -v2c -c public demo.snmplabs.com 1.3.6.1.4.1
+"""#
+from pysnmp.hlapi.v1arch.asyncore import *
+
+
+def cbFun(errorIndication, errorStatus, errorIndex, varBindTable, **context):
+    if errorIndication:
+        print(errorIndication)
+
+    elif errorStatus:
+        print('%s at %s' % (errorStatus.prettyPrint(),
+                            errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
+
+    else:
+        for varBindRow in varBindTable:
+            for varBind in varBindRow:
+                print(' = '.join([x.prettyPrint() for x in varBind]))
+
+        return context.get('nextVarBinds')
+
+snmpDispatcher = SnmpDispatcher()
+
+# Submit initial GETBULK request
+bulkCmd(snmpDispatcher,
+        CommunityData('public'),
+        UdpTransportTarget(('demo.snmplabs.com', 161)),
+        0, 25,
+        ('1.3.6.1.4.1', None),
+        **dict(cbFun=cbFun))
+
+snmpDispatcher.transportDispatcher.runDispatcher()