I noticed on the twittersphere that Brian McClain and Mark Lucovsky had a small exchange about the latest tips and tricks for developing Cloud Foundry API clients. Brian has written a Cloud Foundry Chaos Monkey. The important thing to note is the latest cfoundry gem maintained by Alex Suraci on the Cloud Foundry frameworks team has excellent client logging support of Cloud Controller calls. The cfoundry gem is simply a nice ruby wrapper around the Cloud Controller REST API. You can see these calls in action by using the latest pre-release version of vmc (which also is a gem), which we call vmc-ng where the ng is for next generation. The latest vmc builds upon the latest cfoundry gem.
A few things to note about using vmc-ng:
1) You should install it with gem install vmc --pre where the --pre gives you the ng bits. Note that this is preview code and not fully baked yet.
2) vmc-ng functionality is not enabled by default, you need to create a file or directory in your ~/.vmc directory called use-ng. If you do not have this, vmc will fall back to use the standard version without the new client logging capabilities
3) In order to switch back to the old vmc, simple remove the ~/.vmc/use-ng file or directory.
4) The syntax of some of the commands has changed, so make liberal use of the help. One of my favorites is the updated line view of applications vmc apps -l and you can see an example of that below. Another great switch is -t that turns on tracing and shows all of the HTTP request/response in standard out.
5) When using vmc-ng, the Cloud Controller HTTP calls are logged in the ~/.vmc/logs/api.cloudfoundry.com.log file, where api.cloudfoundry.com is the target.
Check out the gist for a full example using vmc-ng and illustrating the new client logging feature.
37 comments:
Mark also provided a tweet snippet that shows how to use cfoundry with this feature without vmc:
cfclient = CFoundry::Client.new(target) cfclient.log = [] ... # later txlog = cfclient.log.map do |x| ... end
https://twitter.com/marklucovsky/status/253000106591264769
I don't see anything in latest vmc/ng about "~/.vmc/use-ng" to activate it. What is the latest method for activiting v2 features?
I think I've successfully switched to v2, by changing :version in ~/.vmc/tokens.yml for http://api.cloudfoundry.com.
No, I don't think that's right. Now getting errors in most CLI commands.
Is there a different API hostname for v2?
Dr Nic, if the ~/.vmc/use-ng file is there, then you will be using vmc-ng which you can see by the "vmc -v" output. If you remove the ~/.vmc/use-ng then vmc will revert to classic vmc. vmc-ng determines which cloud controller features to use by looking at the output of the cloud controller /info endpoint. For example, api.cloudfoundry.com/info will show that it is a v1 cloud controller as of this comment. When using cc-ng on the server side, the /info endpoint returns information that it supports additional features.
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