I am trying to get list of "servers" for a particular "stack" in Rackspace. I have to do some processing of the Stack resource to get the server list as some of the servers are in a resource group(nested). I get each server through asynchronous call one by one. How to bundle them together and send at one go to the client? Below is the code:
app.js
function setClient(credentials)
{
var client = pkgcloud.orchestration.createClient({
provider: 'rackspace',
username: credentials.uname,
apiKey: credentials.key,
region: 'HKG'
});
return client;
}
app.io.route('ready', function(req) {
var client = setClient(req.session.credentials);
client.getStacks(function (err, stacks) {
if (err) {
req.io.emit("error", { error: err.result.error.message });
return;
}
if (stacks.length > 0) {
var stack = stacks[0].name;
getSer(stack, client, req, 'init');
}
req.io.emit("showStacks", { stacks: stacks });
});
});
app.io.route('create_stack', function(req) {
var stack = req.data.stack_name;
var tmpl = req.data.content;
var client = setClient(req.session.credentials);
client.createStack({
name: stack,
timeout: 60,
template: tmpl // Heat template
}, handle(req));
});
function handle(req) {
return function handle(err, stack)
{
var client = setClient(req.session.credentials);
if (err) {
req.io.emit("error", { error: err.result.error.message });
console.dir(err.result.error.message);
return;
}
client.getStacks(function (err, stacks) {
req.io.emit("showStacks", { stacks: stacks });
});
req.io.emit("status", {status: 'Stack created'});
// Wait for status: CREATE_COMPLETE on our stack, and then callback
stack.setWait({ status: 'CREATE_COMPLETE' }, 5000, function (err) {
if (err) {
req.io.emit("error", { error: err.result.error.message });
console.dir(err);
return;
}
client.getStacks(function (err, stacks) {
req.io.emit("showStacks", { stacks: stacks });
});
client.getStack(stack, function (err, stack) {
if (err) {
req.io.emit("error", { error: err.result.error.message });
console.dir(err.result.error.message);
return;
}
req.io.emit("showStack", { stack: stack });
});
getSer(stack, client, req, 'create');
});
}
}
function getSer(stack, client, req, mode)
{
client.getResources(stack, function(err, resources) {
if (err) {
console.dir(err);
req.io.emit("error", { error: err.result.error.message });
return;
}
resources.forEach(function (resource) {
var nestedlink = '';
var nested = false;
if (resource.links != undefined) {
resource.links.forEach(function (link) {
if (link.rel == "nested") {
nestedlink = link.href;
nested = true;
}
});
}
if (nested) {
var stack_name = nestedlink.substr(nestedlink.indexOf('stacks/')+7, nestedlink.lastIndexOf('/'));
getSer(stack_name, client, req, mode);
} else {
var serId = resource.physicalResourceId;
var ser = serClient(req.session.credentials);
ser.getServer(serId, function (err, server) {
if (mode == 'init')
req.io.emit("showServer", { server: server});
else if (mode == 'create')
req.io.emit("stackCreate", { server: server});
});
}
});
});
}
Actually, the problem is pkgcloud has a method 'getResources' which given the stack name returns the resources. From which I get 'physical_resource_id' (server_id) of the server which is not in a group but for the servers which were created through 'OS::Heat::ResourceGroup' one's to do some extra work because the resource list has only a 'nested' link for it. So I take the stack_name from the nested 'link' and get its server-id var stack_name = nestedlink.substr(nestedlink.indexOf('stacks/')+7, nestedlink.lastIndexOf('/'));. Life would've been easy if pkgcloud had something like given a stack-name it'd return the servers list in it.
The issue I mentioned in the comments (https://github.com/pkgcloud/pkgcloud/issues/410) has been fixed now. With that fix you should be able to request a list of all resources for a stack, including nested resources. Just do this in your code:
client.getResources(stack, { nestedDepth: XXX }, function(err, resources) {
where XXX is a sufficient nesting depth, depending on your stack.
instead of:
client.getResources(stack, function(err, resources) {
The fix to pkgcloud will be included in the next official release. That might not become available for a couple of weeks or months so if you need to download this fix immediately, you can do so with the following command:
npm install https://github.com/pkgcloud/pkgcloud/tarball/master
Alternatively, you could modify the pkgcloud dependency in your project's package.json like so:
"pkgcloud": "git://github.com/pkgcloud/pkgcloud.git"