Helm proxy not retrieving all releases

[migmartri]

I have noticed a couple of issues with the Helm proxy, all of them related to the fact of having a number of releases over 512.

For example, I have a cluster with 862 releases (including deleted)

helm list -a -m 10000 | wc -l
862

But our proxy returns 512

curl 'http://localhost:8080/api/tiller-deploy/v1/releases' [REDACTED] | jq ".data|length"
512

This also affects when asking for releases in a specific namespace. For example, helm tiller only shows the first 3 releases

# Helm list return 27 releases
helm list -a --namespace miguel | wc -l
28

# But helm list only the first ones
curl 'http://localhost:8080/api/tiller-deploy/v1/namespaces/miguel/releases'
{
  "data": [
    {
      "releaseName": "api-d16636",
      "version": "0.1.0",
      "namespace": "miguel"
    },
    {
      "releaseName": "awesome-hyena",
      "version": "0.1.0",
      "namespace": "miguel"
    },
    {
      "releaseName": "crazy-ladybird",
      "version": "1.0",
      "namespace": "miguel",
      "icon": "https://engineering.bitnami.com/images/projects/bitnami-logo.png"
    }
  ]
}

# as you can see if we retrieve only the first 3 elements from helm list

# Only showing the first 
helm list -a --namespace miguel | head -4
NAME                            REVISION        UPDATED                         STATUS          CHART                           NAMESPACE
api-d16636                      1               Mon Jun 19 16:11:04 2017        DELETED         artifacts-0.1.0                 miguel   
awesome-hyena                   1               Mon Jul 17 13:26:40 2017        DELETED         toolchain-web-0.1.0             miguel   
crazy-ladybird                  1               Thu Jul 19 10:36:55 2018        DELETED         fabian-jasper-test-1.0          miguel   

This has a set of consequences once the tiller instance reaches the 512 limit.

• We only show the charts that are withing that 512 window, regardless of if we are asking for a namespace or not. We should double check the get release function since there must be a way to get a release information without relying on listing all. Actually the helm list --namespace foo seems to work as expected but not our listing.
• Any new deployments will be shown as not found even though the deployment is successful.

I think that the scenario in which a cluster will contain more than 512 charts is not that likely but there are some low hanging fruit that we could fix.

If possible:

• Re-implement listReleases(namespace) to not to rely on listing all elements in the namespace. helm list does it properly so there might be a way.
• Re-implement get method to not to rely on the global list.
• We might also want to increase the page size, helm CLI has a max option.