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Dump sandesh trace buffer

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Sundaresan Rajangam edited this page Sep 15, 2015 · 2 revisions

Dump sandesh trace buffer from core file

The python module that is used to dump the sandesh trace buffers from the core file -> sandesh_trace_dump.py

print_trace_buffer_list()

  • dumps the trace buffer list created by the daemon

print_trace_buffer('#trace buffer name#')

  • dumps the content of the specified trace buffer

Before running gdb, please do the following steps

python

import sys

sys.path.insert(0, <path of python pretty-printers package>)

from libstdcxx.v6.printers import register_libstdcxx_printers

register_libstdcxx_printers (None)

end

Now, you are all set for trace mining

Example:

bash-4.2$ gdb vnswad -core core.23531

GNU gdb (GDB) Fedora (7.4.50.20120120-42.fc17) Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: http://www.gnu.org/software/gdb/bugs/... Reading symbols from /home/srajanga/vnswad...done. [New LWP 23534] [New LWP 23535] [New LWP 23536] [New LWP 23537] [New LWP 23531] … …

(gdb) source #path to sandesh_trace_dump.py#

<<<< source the python module that contains the functions to dump the sandesh trace buffer

<<<< You may add this to .gdbinit

(gdb) python print_trace_buffer_list()

<<<< List the trace buffers in vnswad

"Controller"

"XmppMessageTrace"

"XmppTrace"

"Flow"

"IOTraceBuf"

"Config"

"KSync"

"Multicast"

"Oper DB"

"httpbuf"

"Packet"

"Services"

(gdb) python print_trace_buffer('httpbuf')

<<<<< dumps the content of the "httpbuf" trace buffer

2013-04-22 18:15:51 SandeshTraceText: tracemsg = "<Initializing httpbuf" file = "src/sandesh/library/cpp/sandesh_http.cc" line = 378 2013-04-22 18:15:51 SandeshTraceText: tracemsg = "Size 100" file = "src/sandesh/library/cpp/sandesh_http.cc" line = 379

(gdb) python print_trace_buffer('XmppMessageTrace')

<<<< dumps the content of "XmppMessageTrace" trace buffer

2013-04-22 18:15:53 XmppRxStream: str1 = "Received xmpp message from: " IPaddress = "172.27.58.9" str3 = "Port" port = 5269 str5 = "Size: " size = 229 str7 = "Packet: " packet = "\n<stream:stream from="" to="default-global-system-config:nodea1.bng-contrail.englab.juniper.net" id="++123" version="1.0" xml:lang="en" xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams\" >" str9 = "$" file = "src/xmpp/xmpp_connection.cc" line = 290 2013-04-22 18:15:53 XmppTxStream: str1 = "Sent xmpp message to: " IPaddress = "172.27.58.9" str3 = "Port" port = 5269 str5 = "Size: " size = 290 str7 = "Packet: " packet = "<iq type="set" from="default-global-system-config:nodea1.bng-contrail.englab.juniper.net" to="[email protected]/config"><pubsub xmlns="http://jabber.org/protocol/pubsub\"><subscribe node="default-global-system-config:nodea1.bng-contrail.englab.juniper.net" />" str9 = "$" file = "src/xmpp/xmpp_connection.cc" line = 159 2013-04-22 18:15:53 XmppTxStream: str1 = "Sent xmpp message to: " IPaddress = "172.27.58.9" str3 = "Port" port = 5269 str5 = "Size: " size = 350 str7 = "Packet: " packet = "<iq type="set" from="default-global-system-config:nodea1.bng-contrail.englab.juniper.net" to="[email protected]/bgp-peer" id="subscribe0"><pubsub xmlns="http://jabber.org/protocol/pubsub\"><subscribe node="default-domain:default-project:ip-fabric:default">0" str9 = "$" file = "src/xmpp/xmpp_connection.cc" line = 159

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