UI: Adds support for blocking queries on the node detail page #5489
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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
DingoEatingFuzz
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Mar 21, 2019
johncowen
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Mar 22, 2019
…age (#5487) 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
johncowen
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Apr 29, 2019
…age (#5487) 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
johncowen
added a commit
that referenced
this pull request
May 1, 2019
…age (#5487) 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
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This PR should be the final PR adding blocking query support to the catalog area.
(see also #5479 and #5487)
Again, there are slight nuances as to how this works compared to the other PRs in the same series.
The node detail page also features blocking queries for sessions and coordinates. So additionally here we close these extra blocking queries when the node is deregistered as well as showing a warning message.
Another difference from the previous PRs is that the 'signal' from the API so we know when a node has been deregistered is the receipt of a 404 response from the API (as opposed to an empty array), you can see this in the acceptance tests included here.
A large part of this PR also moves the gathering and reshaping of tomography data in a repository and out of the route, this means it will be all been done on each blocking recur/loop without having to add any extra functionality once the data come out of the repository.
Finally, when nodes are deregistered via the catalog, they will pretty quickly be re-registered from the agent - but we don't currently pick that extra change up via the UI.
In more detail, once the signal for a deregistration is a 404, and we can't actually block on a 404ed API response, we would have to switch from blocking to polling on receipt of a 404 and then when the node is re-registered and we get a 200, switch back to blocking again. We could potentially do this similar to what we have done the 5xx errors (which essentially performing 3 second interval polling until a 200 status is received). But this is an extra nicety that we may or may not add at some point in the future.
We'll be moving to other areas of work following this, the only extra thing related here will be changing the current 200 millisecond sleep between loops to a 2000 millisecond sleep, which we'll do once all this series of work is merged into
ui-stagingP.S. The coordinates endpoint is likely to be quite noisy whilst blocking. We've kept the blocking functionality for coordinates here as once we add the 2000 millisecond sleep to blocking queries it should calm it down somewhat in the UI.