[英]Getting Lists from callback in nodejs
I am trying to get list of "servers" for a particular "stack" in Rackspace. 我正在尝试获取Rackspace中特定“堆栈”的“服务器”列表。 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).
我必须对堆栈资源进行一些处理才能获取服务器列表,因为某些服务器位于资源组(嵌套)中。 I get each server through asynchronous call one by one.
我通过异步调用逐一获得每个服务器。 How to bundle them together and send at one go to the client?
如何将它们捆绑在一起并一次性发送给客户? Below is the code:
下面是代码:
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. 实际上,问题在于pkgcloud有一个方法“ getResources”,该方法给出堆栈名称返回资源。 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.
从中,我获得不在组中的服务器的“ physical_resource_id”(server_id),但是对于通过“ OS :: Heat :: ResourceGroup”创建的服务器,它会做一些额外的工作,因为资源列表中只有一个“嵌套”链接。 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('/'));
因此,我从嵌套的“链接”中获取
var stack_name = nestedlink.substr(nestedlink.indexOf('stacks/')+7, nestedlink.lastIndexOf('/'));
并获取其服务器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.
如果pkgcloud具有类似给定堆栈名称的内容,它将返回其中的服务器列表,生活将会很轻松。
The issue I mentioned in the comments ( https://github.com/pkgcloud/pkgcloud/issues/410 ) has been fixed now. 我在评论( https://github.com/pkgcloud/pkgcloud/issues/410 )中提到的问题现已修复。 With that fix you should be able to request a list of all resources for a stack, including nested resources .
使用该修复程序,您应该能够请求堆栈的所有资源的列表, 包括嵌套资源 。 Just do this in your code:
只需在您的代码中执行此操作:
client.getResources(stack, { nestedDepth: XXX }, function(err, resources) {
where XXX
is a sufficient nesting depth, depending on your stack. 其中
XXX
是足够的嵌套深度,具体取决于您的堆栈。
instead of: 代替:
client.getResources(stack, function(err, resources) {
The fix to pkgcloud will be included in the next official release. pkgcloud的修复程序将包含在下一个正式版本中。 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:
它可能在数周或数月内不可用,因此,如果您需要立即下载此修补程序,可以使用以下命令进行:
npm install https://github.com/pkgcloud/pkgcloud/tarball/master
Alternatively, you could modify the pkgcloud
dependency in your project's package.json
like so: 另外,您可以在项目的
package.json
修改pkgcloud
依赖关系,如下所示:
"pkgcloud": "git://github.com/pkgcloud/pkgcloud.git"
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