1. Remove ember-cli-clipboard dependency
2. Provide a new copy-button component implementing the same
interface as ^ but make the clipboard functionality injectable
3. Provide 2 implementations of a Clipboard. One using clipboard.js (as
previously) and an additional local storage 'clipboard'.
4. add a BDD step to assert whats in the clipboard (the fake one)
Main reason here is that `document.exec` must be called by a user
interaction
* ui: Normal proxies line to services, sidecars to instances
Following on from https://github.com/hashicorp/consul/pull/5933 we
noticed that 'normal' proxies should link to the service, rather than
the service instance. Additionally proxy 'searching' within the
repository should take into account the name of the node that the
originating service is on (sidecar proxies are generally co-located)
Added an additional test here to prove that a sidecar-proxy with the
same service id but on a different node does not show the sidecar proxy
link.
1. All {{ivy-codemirror}} components need 'refreshing' when they become
visible via our own `didAppear` method on the `{{code-editor}}`
component
(also see:)
- https://github.com/hashicorp/consul/pull/4190#discussion_r193270223
- 73db111db8 (r225264296)
2. On initial investigation, it looks like the component we are using
for the code editor doesn't distinguish between setting its `value`
programatically and a `keyup` event, i.e. an interaction from the user.
We currently pretend that whenever its `value` changes, it is a `keyup`
event. This means that when we reset the `value` to `""`
programmatically for form resetting purposes, a 'pretend keyup' event
would also be fired, which would in turn kick off the validation, which
would fail and show an error message for empty values in other fields of
the form - something that is perfectly valid if you haven't typed
anything yet. We solved this by checking for `isPristine` on fields that
are allowed to be empty before you have typed anything.
1. Amends our `base` animation placeholder to always reset
transition-duration. This has no effect on other components that are
already using this animation.
2. Adds a confirming class whenever a key is pressed, to show the green
tick. Uses CSS via `transition-delay` for debouncing.
Previously we were creating a fake event and amending the name of the
fake event, this meant that other `event.target` properties weren't
being passed through (in this instance `checked`) this changes the
approach to not use fake events, and allows you to overwrite the name
that the form uses for `handleEvent`
1. Includes Datacenter variable for intperolation
2. Amends text on the Settings page to reflect new keyword
3. Adds further acceptance testing around the new dashboard buttons
Encodes any variables passed in to be used for template interpolation, but importantly nothing else in the URL apart from the variables themselves. 'Generally' service names are reasonably URL safe, but we know of usecases using at least /s in service names.
This PR adds a new {{template-anchor}} component. This component lets you specify a 'href template' in a handlebars like format instead of a normal string href. This template will be interpolated with the contents of a vars="" attribute.
Also contains code to add an extra UI Setting to be able to store a template to be used for this anchor in localStorage
Adds support for ACL Roles and Service Identities CRUD, along with necessary changes to Tokens, and the CSS improvements required.
Also includes refinements/improvements for easier testing of deeply nested components.
1. ember-data adapter/serializer/model triplet for Roles
2. repository, form/validations and searching filter for Roles
3. Moves potentially, repeated, or soon to to repeated functionality
into a mixin (mainly for 'many policy' relationships)
4. A few styling tweaks for little edge cases around roles
5. Router additions, Route, Controller and templates for Roles
Also see:
* UI: ACL Roles cont. plus Service Identities (#5661 and #5720)
* ui: Replaces Service listing filterbar with a phrase-editor search (#5507)
1. New phrase-editor restricting search to whole phrases (acts on
enter key). Allows removal of previously entered phrases
2. Searching now allows arrays of terms, multiple terms work via AND
If a service instance show page is being viewed and the service instance
is deregistered, this closes the blocking query for the proxy as well as
the instance (the instances query will be clsed on the error)
Also adds skipped tests to nag in future
Previously the tomography wasn't using ember `get` so proxy updates
(specifically here whilst receiving a blocking update) wasn't working.
This adds `get` here until we update to newer `get`less ember and also
refactors slightly removing `n` and using `distance.length` instead
Skipped tests are adding here to nag us to come back here at some point.
...also:
Temporarily overwrites native setTimeout and setInterval for e2e/acceptance
testing similar to how XHR is overwritten for e2e/acceptance testing.
This makes the blocking query acceptance tests run faster until we add a
better burstable rate limiter for blocking queries.
This commit includes several pieces of functionality to enable services
to be removed and the page to present information that this has happened
but also keep the deleted information on the page. Along with the more
usual blocking query based listing.
To enable this:
1. Implements `meta` on the model (only available on collections in
ember)
2. Adds new `catchable` ComputedProperty alongside a `listen` helper for
working with specific errors that can be thrown from EventSources in an
ember-like way. Briefly, normal computed properties update when a
property changes, EventSources can additionally throw errors so we can
catch them and show different visuals based on that.
Also:
Add support for blocking queries on the service instance detail page
1. Previous we could return undefined when a service instance has no
proxy, but this means we have nothing to attach `meta` to. We've changed
this to return an almost empty object, so with only a meta property.
At first glance there doesn't seem to be any way to provide a proxy
object to templates and be able to detect whether it is actually null
or not so we instead change some conditional logic in the templates to
detect the property we are using to generate the anchor.
2. Made a `pauseUntil` test helper function for steps where we wait for
things. This helps for DRYness but also means if we can move away from
setInterval to something else later, we can do it in one place
3. Whilst running into point 1 here, we managed to make the blocking
queries eternally loop. Whilst this is due to an error in the code and
shouldn't ever happen whilst in actual use, we've added an extra check
so that we only recur/loop the blocking query if the previous response has a
`meta.cursor`
Adds support for blocking queries on the node detail page (#5489)
1. Moves data re-shaping for the templates variables into a repository
so they are easily covered by blocking queries (into coordinatesRepo)
2. The node API returns a 404 as signal for deregistration, we also
close the sessions and coordinates blocking queries when this happens
This commit includes several pieces of functionality to enable services
to be removed and the page to present information that this has happened
but also keep the deleted information on the page. Along with the more
usual blocking query based listing.
To enable this:
1. Implements `meta` on the model (only available on collections in
ember)
2. Adds new `catchable` ComputedProperty alongside a `listen` helper for
working with specific errors that can be thrown from EventSources in an
ember-like way. Briefly, normal computed properties update when a
property changes, EventSources can additionally throw errors so we can
catch them and show different visuals based on that.
More recommendations for blocking queries clients was added here:
https://github.com/hashicorp/consul/pull/5358
This commit mainly adds cursor/index validation/correction based on
these recommendations (plus tests)
The recommendations also suggest that clients should include rate
limiting. Because of this, we've moved the throttling out of Consul UI
specific code and into Blocking Query specific code. Currently the 'rate
limiting' in this commit only adds a sleep to every iteration of the
loop, which is not the recommended approach, but the code here organizes
the throttling functionality into something we can work with later to
provide something more apt.
* ui: Add forking based on service instance id existence
Proxies come in 2 flavours, 'normal' and sidecar. We know when a proxy
is a sidecar proxy based on whether a DestinationServiceID is set.
LocalServiceAddress and LocalServicePort are only relevant for sidecar
proxies.
This adds template logic to show different text depending on this
information.
Additionally adds test around connect proxies (#5418)
1. Adds page object for the instance detail page
2. Adds further scenario steps used in the tests
3. Adds acceptance testing around the instance detail page. Services
with proxies and the sidecar proxies and proxies themselves
4. Adds datacenter column for upstreams
5. Fixes bug routing bug for decision as to whether to request proxy
information or not
Add totals to some listing views, remove healthcheck totals
1. Adds markup to render totals for Services, Nodes, Intentions and v1
ACLs
2. Removes counts from healthcheck filters, and therefore simplify text,
moving the copy to the templates
3. Alter test to reflect the fact that the text of the buttons are no
static in the component template rather than a dynamic attribute
This gives more prominence to 'Service Instances' as opposed to 'Services'. It also begins to surface Connect related 'nouns' such as 'Proxies' and 'Upstreams' and begins to interconnect them giving more visibility to operators.
Various smaller changes:
1. Move healthcheck-status component to healthcheck-output
2. Create a new healthcheck-status component for showing the number of
checks plus its icon
3. Create a new healthcheck-info component to group multiple statuses
plus a different view if there are no checks
4. Componentize tag-list
* ui: Add ember steps:list command for listing available steps
1. Adds `command` addon to house the new command
2. Start to organize out the steps themselves, bring a bit more order to
things ready to dedupe and cleanup
- Maintain http headers as JSON-API meta for all API requests (#4946)
- Add EventSource ready for implementing blocking queries
- EventSource project implementation to enable blocking queries for service and node listings (#5267)
- Add setting to enable/disable blocking queries (#5352)
Adds xhr connection managment to http/1.1 installs
This includes various things:
1. An object pool to 'acquire', 'release' and 'dispose' of objects, also
a 'purge' to completely empty it
2. A `Request` data object, mainly for reasoning about the object better
3. A pseudo http 'client' which doens't actually control the request
itself but does help to manage the connections
An initializer is used to detect the script element of the consul-ui sourcecode
which we use later to sniff the protocol that we are most likely using for API access
`window` and `document` are easily injected anyhow, but this
primarily this keeps everything dom related in the same place.
Included here are changes to make all ember related objects use the dom
service `document` and `viewport` instead of just `document` and
`window`.
Quote from a previous PR (#4924) which explains the thinking around this:
> Now I have all these things in the dom service, it would make sense
to get window from there also. I was thinking of making a viewport
method, which would be a nice word whether window was a browser window,
an iframe (not really a window) like when ember testing, or anything
else. To me the viewport is what we are actually talking about here.
1. Ensure any unexpected developer errors are passed through/shown
2. Previously when errors where returns/resolved the special
isEnabled/isAuthorized would never get resolved. This was fine as they
were set to false to start with anyway, but this resolves them again to
false for completeness
3. Improved unit testing coverage
Move all the dom-things to use the dom service in tabular-collection, feedback-dialog, list-collection and node show. Move get-component-factory into utils/dom and use dom.root() in a few more places
This includes an additional `dom.components` method which gives you a
list of components matching the selector instead of just one.
This does several things to make improving the search experience easier
moving forwards:
1. Separate searching off from filtering. 'Searching' can be thought of
as specifically 'text searching' whilst filtering is more of a
boolean/flag search.
2. Decouple the actual searching functionality to almost pure,
isolated / unit testable units and unit test. (I still import embers get
which, once I upgrade to 3.5, I shouldn't need)
3. Searching rules are now configurable from the outside, i.e. not
wrapped in Controllers or Components.
4. General searching itself now can use an asynchronous approach based on
events. This prepares for future possibilities of handing off the
searching to a web worker or elsewhere, which should aid in large scale
searching and prepares the way for other searching methods.
5. Adds the possibility of have multiple searches in one
template/route/page.
Additionally, this adds a WithSearching mixin to aid linking the
searching to ember in an ember-like way in a single place. Plus a
WithListeners mixin to aid with cleaning up of event listeners on
Controller/Component destruction.
Post-initial work I slightly changed the API of create listeners:
Returning the handler from a `remover` means you can re-add it again if you
want to, this avoids having to save a reference to the handler elsewhere
to do the same.
The `remove` method itself now returns an array of handlers, again you
might want to use these again or something, and its also more useful
then just returning an empty array.
The more I look at this the more I doubt that you'll ever use `remove`
to remove individual handlers, you may aswell just use the `remover`
returned from add. I've added some comments to reflect this, but they'll
likely be removed once I'm absolutely sure of this.
I also added some comments for WithSearching to explain possible further
work re: moving `searchParams` so it can be `hung` off the
controller object
In 858b05fc31 (diff-46ef88aa04507fb9b039344277531584)
we removed encoding values in pathnames as we thought they were
eventually being encoded by `ember`. It looks like this isn't the case.
Turns out sometimes they are encoded sometimes they aren't. It's complicated.
If at all possible refer to the PR https://github.com/hashicorp/consul/pull/5206.
It's related to the difference between `dynamic` routes and `wildcard` routes.
Partly related to this is a decision on whether we urlencode the slashes within service names or not. Whilst historically we haven't done this, we feel its a good time to change this behaviour, so we'll also be changing services to use dynamic routes instead of wildcard routes. So service links will then look like /ui/dc-1/services/application%2Fservice rather than /ui/dc-1/services/application/service
Here, we define our routes in a declarative format (for the moment at least JSON) outside of Router.map, and loop through this within Router.map to set all our routes using the standard this.route method. We essentially configure our Router from the outside. As this configuration is now done declaratively outside of Router.map we can also make this data available to href-to and paramsFor, allowing us to detect wildcard routes and therefore apply urlencoding/decoding.
Where I mention 'conditionally' below, this is detection is what is used for the decision.
We conditionally add url encoding to the `{{href-to}}` helper/addon. The
reasoning here is, if we are asking for a 'href/url' then whatever we
receive back should always be urlencoded. We've done this by reusing as much
code from the original `ember-href-to` addon as possible, after this
change every call to the `{{href-to}}` helper will be urlencoded.
As all links using `{{href-to}}` are now properly urlencoded. We also
need to decode them in the correct place 'on the other end', so..
We also override the default `Route.paramsFor` method to conditionally decode all
params before passing them to the `Route.model` hook.
Lastly (the revert), as we almost consistently use url params to
construct API calls, we make sure we re-encode any slugs that have been
passed in by the user/developer. The original API for the `createURL`
function was to allow you to pass values that didn't need encoding,
values that **did** need encoding, followed by query params (which again
require url encoding)
All in all this should make the entire ember app url encode/decode safe.
In order to continue supporting the legacy ACL system, we replace
the 500 error from a non-existent `self` endpoint with a response of a
`null` `AccessorID` - which makes sense (a null AccessorID means old
API)
We then redirect the user to the old ACL pages which then gives a 403
if their token was wrong which then redirects them back to the login page.
Due to the multiple redirects and not wanting to test the validity of the token
before redirecting (thus calling the same API endpoint twice), it is not
straightforwards to turn the 'faked' response from the `self` endpoint
into an error (flash messages are 'lost' through multiple redirects).
In order to make this a slightly better experience, you can now return a
`false` during execution of an action requiring success/failure
feedback, this essentially skips the notification, so if the action is
'successful' but you don't want to show the notification, you can. This
resolves showing a successful notification when the `self` endpoint
response is faked. The last part of the puzzle is to make sure that the
global 403 catching error in the application Route also produces an
erroneous notification.
Please note this can only happen with a ui client using the new ACL
system when communicating with a cluster using the old ACL system, and
only when you enter the wrong token.
Lastly, further acceptance tests have been added around this
This commit also adds functionality to avoid any possible double
notification messages, to avoid UI overlapping
In some circumstances a consul 1.4 client could be running in an
un-upgraded 1.3 or lower cluster. Currently this gives a 500 error on
the new ACL token endpoint. Here we catch this specific 500 error/message
and set the users AccessorID to null. Elsewhere in the frontend we use
this fact (AccessorID being null) to decide whether to present the
legacy or the new ACL UI to the user.
Also:
- Re-adds in most of the old style ACL acceptance tests, now that we are keeping the old style UI
- Restricts code editors to HCL only mode for all `Rules` editing (legacy/'half legacy'/new style)
- Adds a [Stop using] button to the old style ACL rows so its possible to logout.
- Updates copy and documentation links for the upgrade notices
1. Unskip some trivial tests that were being tested higher up
2. Istanbul ignore some code for coverage.
1. Things that I didn't write and need to 100% follow
2. The source code checking test that has Istanbul code injected into
it
3. Add a few simple test cases
4. Support passing port numbers through to `ember serve` and `ember
test` for use cases that would benefit from being able to configure the
ports things are served over but still use `yarn run` thus reusing the
`yarn run` config in `package.json`
Repositories are a class of services to help with CRUD actions, most of
the functionality is reused across various Models. This creates a new
repository service that centralizes all this reused functionality.
Inheritance via ember `Service.extend` is used as opposed to
decorating via Mixins.
1. Move all repository services (and their tests) to a
services/repository folder
2. Standardize on a singular name format 'node vs nodes'
3. Create a new 'repository' service to centralize functionality. This
should be extended by 'repository' services
Essentially this was missing a call to `super`. The error unfortuantely
didn't arise in the tests as it only errors when the node list has 4
items are more (the 4 columns), and the acceptence tests by change were
only filling the page with 3 nodes for test purposes.
I've bumped the amount of nodes up to 4 in the tests, which then causes
the tests to fail, made the fix by adding the `super` call, and the
tests now pass.
I also tested the UI/text searching on a 10,000 node system, and
everything now works as expected.
Upgrade all patch and minor upgradeable packages, also uses `only`
in ember-cli-build to reduce the included helpers from certain helper
packages.
Make some major version upgrades for some dev tools
- husky
- lint-staged
- ember-cli-yadda
- ember-cli-sass (also moved from node-sass to dart-sass)
Minor tweak: spotted css file (instead of scss file), rename
The move to `dart-sass`:
dart-sass has been the primary implementation of sass for ~6 months and
will receive updates earlier than libsass (ruby-sass itself is now deprecated)
Other benefits include not having to recompile (via `npm rebuild` or similar)
when switching platforms and an 'almost' javascript based solution.
This update also alters some media queries that, whilst wouldn't compile
anymore with either an updated libsass or dart-sass, where probably a
little over complicated anyway, I've therefore made them similar to
other breakpoints that made sense.
Various ember addons produced deprecation messages, some in the browser
console and some in terminal. Upgrading and replacing some of these has
reduced this.
Upgrades:
- ember-collection
- ember-computed-style
Replacements:
- ember-pluralize replaced with ember-inflector
- ember-cli-format-number replaced with custom helper using standard
`toLocaleString`
Removing ember-cli-format-number also meant some further changes related
to decimal places in the tomography graph, done using `toFixed`
The ExternalSources background-images have also now been escaped
correctly preventing in-development `console` warnings.
The only deprecation warnings are now from ember-block-slots, only in
terminal, making for a better development experience overall, especially now we
have an empty browser console
Also adds a `callIfType` 'helper util' which is a util specifically for helpers (it conforms to a helper argument signature) to be expanded upon later.
Having the code editor on removes the text area from the DOM, making it
more difficult to enter text in the text editor during testing. This
turns the code editor off whilst making edits during testing.
No changes to UI code
The mocks where using randomly generated `ExternalSources` this change
makes sure they are fixed so we can reliably test the values. No change
to actual UI code
The error notification was being shown on creation of an intention. This
was as a result of #4572 and/or #4572 and has not been included in a
release.
This includes a fix, plus tests to try to prevent any further regression.
1. Addition of external source icons for services marked as such.
2. New %with-tooltip css component (wip)
3. New 'no healthcheck' icon as external sources might not have
healthchecks, also minus icon on node cards in the service detail view
4. If a service doesn't have healthchecks, we use the [Services] tabs as the
default instead of the [Health Checks] tab in the Service detail page.
5. `css-var` helper. The idea here is that it will eventually be
replaced with pure css custom properties instead of having to use JS. It
would be nice to be able to build the css variables into the JS at build
time (you'd probably still want to specify in config which variables you
wanted available in JS), but that's possible future work.
Lastly there is probably a tiny bit more testing edits here than usual,
I noticed that there was an area where the dynamic mocking wasn't
happening, it was just using the mocks from consul-api-double, the mocks
I was 'dynamically' setting happened to be the same as the ones in
consul-api-double. I've fixed this here also but it wasn't effecting
anything until actually made certain values dynamic.
* Move notification texts to a slightly different layer (#4572)
* Further Simplify/refactor the actions/notification layer (#4573)
1. Move the 'with-feedback' actions to a 'with-blocking-action' mixin
which better describes what it does
2. Additional set of unit tests almost over the entire layer to prove
things work/add confidence for further changes
The multiple 'with-action' mixins used for every 'index/edit' combo are
now reduced down to only contain the functionality related to their
specific routes, i.e. where to redirect.
The actual functionality to block and carry out the action and then
notify are 'almost' split out so that their respective classes/objects do
one thing and one thing 'well'.
Mixins are chosen for the moment as the decoration approach used by
mixins feels better than multiple levels of inheritence, but I would
like to take this fuether in the future to a 'compositional' based
approach.
There is still possible further work to be done here, but I'm a lot
happier now this is reduced down into separate parts.
ui: Repo layer integration tests for methods that touch the API
Includes a `repo` test helper to make repetitive tasks easier, plus a
injectable reporter for sending performance metrics to a centralized metrics
system
Also noticed somewhere in the ember models that I'd like to improve, but left
for the moment to make sure I concentrate on one task at a time, more or less:
The tests currently asserts against the existing JSON tree, which doesn't
seem to be a very nice tree.
The work at hand here is to refactor what is there, so test for the not
nice tree to ensure we don't get any regression, and add a skipped test
so I can come back here later
WIP Unskip some lower level trivial tests.
This is the beginning of work to unskip some of the more trivial tests that I'd skipped a while back (if the thing they are testing broke, they would have failed higher up in other acceptance tests).
I'd rather keep the tests, as they do test things in a more isolated manner, and the plan was to always come back and work to unskip them time allowing.
I didn't get to far into this work in progress here, but I'd rather merge what I've done all the same and come back at a later date and continue.
1. Split the resizing functionality of into a separate mixin to be
shared across components
2. Add basic integration tests to prove that everything is getting
called through out the lifetime of the app. I decided against unit
testing as there isn't really any isolated logic to be tested, more
checking that things are being called in the correct order etc i.e. the
integration is correct.
Adds assertion to with-resizing so its obvious to override `resize`
* Add some tests to check the correct GET API endpoints are called
* Refactor adapters
1. Add integration tests for `urlFor...` and majority `handleResponse` methods
2. Refactor out `handleResponse` a little more into single/batch/boolean
methods
3. Move setting of the `Datacenter` property into the `handleResponse`
method, basically the same place that the uid is being set using the dc
parsed form the URL
4. Add some Errors for if you don't pass ids to certain `urlFor` methods
We now essentially do 2 redirects if you hit a `folder/`
1. If you visit `/ui/dc1/kv/folder/`, `consul` will redirect you to `/ui/dc1/kv/folder`
2. Once redirected to `/ui/dc1/kv/folder` via a 301, use ember/history
API to redirect you back to `/ui/dc1/kv/folder/`.
Bit long winded, but achieves what we want without having to get stuck
into `consul` itself to remove the 301 for the UI
The Consul API can pass through `Value: null` which does not get cast to
a string by ember-data. This snowballs into problems with `atob` which
then tried to decode `null`.
There are 2 problems here.
1. `Value` should never be `null`
- I've added a removeNull function to shallowly loop though props and
remove properties that are `null`, for the moment this is only on
single KV JSON responses - therefore `Value` will never be `null`
which is the root of the problem
2. `atob` doesn't quite follow the `window.atob` API in that the
`window.atob` API casts everything down to a string first, therefore it
will try to decode `null` > `'null'` > `crazy unicode thing`.
- I've commented in a fix for this, but whilst this shouldn't be
causing anymore problems in our UI (now that `Value` is never `null`),
I'll uncomment it in another future release. Tests are already written
for it which more closely follow `window.atob` but skipped for now
(next commit)
1. There are various things tests that can just have intentions added
into them, like filters and such like, add intentions to these
2. Start thinking about being able to negate steps easily, which will
lead on to a cleanup of the steps
This enables people to enter things using the mouse to paste for
example, plus possible other things.
As an aside it also answers my query regarding `fillIn` for testing,
nothing needs to be actually _typed_ anymore! Doh
Previously `api-double` usage in ember would require a bunch of `fetch`
requests to pull in the 'api double', this had a number of disadvantages.
1. The doubles needed to be available via HTTP, which meant a short term
solution of rsyncing the double files over to `public` in order to be served
over HTTP. An alternative to that would have been figuring out how to serve
something straight from `node_modules`, which would have been preferable.
2. ember/testem would not serve dot files (so anything starting with a
., like `.config`. To solve this via ember/testem would have involved
digging in to understand how to enable the serving of dot files.
3. ember/testem automatically rewrote urls for non-existant files to
folders, i.e. adding a slash for you, so `/v1/connect/intentions` would
be rewritten to `/v1/connect/intentions/`. This is undesirable, and
solving this via ember/testem would have involved digging deep to
disable that.
Serving the files via HTTP has now changed. The double files are now
embedded into the HTML has 'embedded templates' that can be found by
using the url of the file and a simple `querySelector`. This of course
only happens during testing and means I can fully control the 'serving'
of the doubles now, so I can say goodbye to the need to move files
around, worry about the need to serve dotfiles and the undesirable
trailing slashes rewriting. Winner!
Find the files and embedding them is done using a straightforward
recursive-readdir-sync (the `content-for` functionality is a synchronous
api) as oppose to getting stuck into `broccoli`.
1. Listing, filtering by action and searching by source name and
destination name
2. Edit/Create page, edits ping the API double fine, need to work through
creates and deletes
3. Currently uses a `Precedence` intention keyname that doesn't yet
exist in the real API
1. Check the dc's model for both dcs list and the requested dc.
2. If the dc model doesn't exist use and empty array for dcs and a fake
dc with the Name 'Error' as we can't even trust what is in the
`paramsFor`
John Cowen