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, 48 insertions, 0 deletions

diff --git a/examples/hlapi/v3arch/trollius/manager/cmdgen/v1-get.py b/examples/hlapi/v3arch/trollius/manager/cmdgen/v1-get.py
new file mode 100644
index 00000000..771e48c6
--- /dev/null
+++ b/examples/hlapi/v3arch/trollius/manager/cmdgen/v1-get.py
@@ -0,0 +1,48 @@
+"""
+SNMPv1
+++++++
+
+Send SNMP GET request using the following options:
+
+  * with SNMPv1, community 'public'
+  * over IPv4/UDP
+  * to an Agent at demo.snmplabs.com:161
+  * for an instance of SNMPv2-MIB::sysDescr.0 MIB object
+  * Based on trollius I/O framework
+
+Functionally similar to:
+
+| $ snmpget -v1 -c public demo.snmplabs.com SNMPv2-MIB::sysDescr.0
+
+"""#
+import trollius
+from pysnmp.hlapi.v3arch.asyncio import *
+
+
+@trollius.coroutine
+def run():
+    snmpEngine = SnmpEngine()
+    (errorIndication,
+     errorStatus,
+     errorIndex,
+     varBinds) = yield trollius.From(
+        getCmd(snmpEngine,
+               CommunityData('public', mpModel=0),
+               UdpTransportTarget(('demo.snmplabs.com', 161)),
+               ContextData(),
+               ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)))
+    )
+
+    if errorIndication:
+        print(errorIndication)
+    elif errorStatus:
+        print('%s at %s' % (errorStatus.prettyPrint(),
+                            errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
+    else:
+        for varBind in varBinds:
+            print(' = '.join([x.prettyPrint() for x in varBind]))
+
+    snmpEngine.transportDispatcher.closeDispatcher()
+
+
+trollius.get_event_loop().run_until_complete(run())