jklein
db00198c6b
Part of #43 — templates/NOTES.txt. The rule from the approved plan was that a NOTES.txt repeating the values is worthless, so this one prints what an operator would otherwise look up in the templates: the rendered URL (or the port-forward command when the Ingress is off, plus the reason ingress.domain stays required — it is CORE_DEFAULT_DOMAIN), the two op:// refs together with the exact field names the 1Password items must carry ("connection-url" and "server-secret", because the operator names the Secret keys after the item's fields), and the traps of this chart: the setup page hands the super administrator to whoever reaches the URL first, migrations run inside the startup probe's window (computed from the effective probe values), a database outage leaves the pod running and NotReady because liveness deliberately uses "/", the upload ceiling that actually bites is the Ingress annotation and not the app's fixed 500mb, /tmp is an emptyDir counted against the ephemeral-storage limit (computed) so an oversized upload evicts the pod, and the uploads PVC is an ordinary release resource that "helm uninstall" deletes. Conditional sections cover scaleDown / replicas: 0, more than one replica against the single ReadWriteOnce claim, and a set zipline.env. No domain is baked into the chart; every host is rendered from the values, examples use example.com. Part of #157 — multiplyQuantity. The null-safe fallbacks pass values through fromYaml, which parses every number as float64, and Go's "%v" switches float64 to exponential notation from about 1e6 upwards: a bare "1048576" arrived as "1.048576e+06" and the render aborted on the suffix check. This is the canonical correction agreed for all charts, taken over verbatim with this chart's prefix — the input and the non-integer product now go through a formatNumber helper, and the toYaml/fromYaml round trip is not touched, since it is not the cause. Measured against ci/zipline/test-values.yaml on the chart's only resources path, zipline.resources: before, both requests.memory=1048576 and requests.ephemeralStorage=1048576 aborted with unsupported resource quantity suffix "e+06" in "1.048576e+06" after, they render with the limits "3145728", while the 65536 fallback probe still yields 196608 unchanged. Rendered manifests are byte-identical to the previous version for the default values.
292 lines
12 KiB
Smarty
292 lines
12 KiB
Smarty
{{/*
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Render the body of a container "resources:" block from a values dict of the form
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resources:
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limitFactor: 3 # optional, default 3
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requests: { cpu, memory, ephemeral-storage / ephemeralStorage, ... }
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limits: { ... } # optional, every entry optional
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Rules (variant B, see issue #19):
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- requests are rendered as given (camelCase "ephemeralStorage" is normalized
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to the Kubernetes key "ephemeral-storage").
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- an explicitly set limit always wins.
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- a missing memory / ephemeral-storage limit is computed as
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limitFactor x the corresponding request.
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- a missing cpu limit is NOT set at all (the kubelet then treats CPU as
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unlimited; CPU is compressible, so this cannot kill the workload).
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Usage (the values path to the resources dict varies per chart):
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resources:
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{{- include "zipline.resources" .Values.<app>.resources | nindent 12 }}
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NOTE: charts in this repo deliberately have no dependencies, so this helper is
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duplicated into every chart's templates/_helpers.tpl with the chart's name as
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define prefix. This file in template-chart is the reference implementation.
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*/}}
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{{- define "zipline.resources" -}}
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{{- $resources := . | default dict -}}
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{{- $factor := 3.0 -}}
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{{- if not (kindIs "invalid" $resources.limitFactor) -}}
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{{- $factor = float64 $resources.limitFactor -}}
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{{- end -}}
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{{- $requests := dict -}}
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{{- range $key, $value := ($resources.requests | default dict) -}}
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{{- if not (kindIs "invalid" $value) -}}
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{{- $_ := set $requests (include "zipline.resourceKey" $key) $value -}}
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{{- end -}}
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{{- end -}}
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{{- $limits := dict -}}
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{{- range $key, $value := ($resources.limits | default dict) -}}
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{{- if not (kindIs "invalid" $value) -}}
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{{- $_ := set $limits (include "zipline.resourceKey" $key) $value -}}
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{{- end -}}
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{{- end -}}
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{{- range $key, $request := $requests -}}
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{{- if and (ne $key "cpu") (not (hasKey $limits $key)) -}}
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{{- $_ := set $limits $key (include "zipline.multiplyQuantity" (dict "quantity" $request "factor" $factor)) -}}
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{{- end -}}
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{{- end -}}
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{{- $out := dict -}}
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{{- with $requests }}{{- $_ := set $out "requests" . }}{{- end -}}
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{{- with $limits }}{{- $_ := set $out "limits" . }}{{- end -}}
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{{- toYaml $out -}}
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{{- end -}}
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{{/*
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Normalize a resource name from values to its Kubernetes key.
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*/}}
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{{- define "zipline.resourceKey" -}}
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{{- if eq . "ephemeralStorage" -}}ephemeral-storage{{- else -}}{{ . }}{{- end -}}
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{{- end -}}
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{{/*
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Multiply a Kubernetes quantity by a factor, keeping its suffix.
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Input: dict "quantity" <string|number> "factor" <float64>.
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Handles plain numbers ("2", "0.5", 1073741824), decimal ("1.5Gi"), binary
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("512Mi", "1Gi", "10Ki") and milli/SI suffixes ("100m", "500M"). Integer
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results are printed without a decimal point.
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*/}}
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{{- define "zipline.multiplyQuantity" -}}
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{{- $quantity := include "zipline.formatNumber" .quantity -}}
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{{- $number := regexFind "^[0-9]+(\\.[0-9]+)?" $quantity -}}
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{{- if not $number -}}
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{{- fail (printf "cannot parse resource quantity %q" $quantity) -}}
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{{- end -}}
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{{- $suffix := trimPrefix $number $quantity -}}
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{{- if not (regexMatch "^(m|k|M|G|T|P|E|Ki|Mi|Gi|Ti|Pi|Ei)?$" $suffix) -}}
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{{- fail (printf "unsupported resource quantity suffix %q in %q" $suffix $quantity) -}}
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{{- end -}}
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{{- $product := mulf (float64 $number) .factor -}}
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{{- if eq $product (floor $product) -}}
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{{- printf "%d%s" (int64 $product) $suffix -}}
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{{- else -}}
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{{- printf "%s%s" (include "zipline.formatNumber" $product) $suffix -}}
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{{- end -}}
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{{- end -}}
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{{/*
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Render a number as a plain decimal string, never in exponential notation.
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Why this exists (issue #157): the null-safe fallback helpers pass values
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through fromYaml, which parses every number as float64. Go's "%v" switches
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float64 to exponential notation from about 1e6 upwards, so a bare byte count
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like 1048576 became "1.048576e+06" - not a valid Kubernetes quantity, and the
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render aborted. Strings ("512Mi") are passed through untouched.
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*/}}
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{{- define "zipline.formatNumber" -}}
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{{- if kindIs "float64" . -}}
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{{- regexReplaceAll "\\.?0+$" (printf "%.10f" .) "" -}}
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{{- else -}}
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{{- printf "%v" . -}}
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{{- end -}}
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{{- end -}}
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{{/*
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Render the replica count for a Deployment/StatefulSet.
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Input: dict
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"scaleDown" the chart-global .Values.scaleDown flag (may be nil)
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"replicas" the workload's replicas value (may be nil)
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Rules (issue #25):
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- scaleDown: true takes precedence and always yields 0.
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- otherwise an explicitly set replicas value is used as given, including an
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explicit 0 — Helm's "default" would swallow 0, hence the explicit
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kindIs "invalid" nil check.
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- a missing replicas value defaults to 1.
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Usage (the values path to the workload's replicas varies per chart):
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replicas: {{ include "zipline.replicas" (dict "scaleDown" .Values.scaleDown "replicas" .Values.<app>.replicas) }}
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NOTE: like the resources helper above, this is duplicated into every chart's
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templates/_helpers.tpl with the chart's name as define prefix. This file in
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template-chart is the reference implementation.
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*/}}
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{{- define "zipline.replicas" -}}
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{{- if .scaleDown -}}
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0
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{{- else if not (kindIs "invalid" .replicas) -}}
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{{- .replicas -}}
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{{- else -}}
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1
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{{- end -}}
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{{- end -}}
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{{/*
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Merge a user-supplied values sub-tree onto a dict of chart defaults so that a
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null / empty override falls back to the defaults instead of erasing them.
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Input: dict "defaults" <dict> "given" <dict|nil> "path" <string, optional
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values path used in error messages>. Output: YAML of the merged dict (consume
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it with fromYaml).
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Why this exists (issue #99): Helm merges values maps recursively, but an
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override key written without children — e.g. a leftover
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securityContext:
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after deleting its last remaining sub-key — is YAML null. Where the chart
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defines a default, Helm treats that null as a deletion of the default; the
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template then renders "securityContext: null": no readOnlyRootFilesystem, no
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dropped capabilities, no allowPrivilegeEscalation: false. The workload starts
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and reports healthy while being unhardened, so nothing points at the mistake.
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The same shape erases a probe (it disappears) or the resources block (no
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requests, no computed limits). This helper defines the opposite semantics: an
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empty block means "chart defaults apply".
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Rules:
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- a nil "given" is treated as an empty dict (all defaults apply).
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- a key whose override value is null keeps the default (nulls never delete).
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- a key present in both as a map is merged recursively, so a partially
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filled block only overrides the keys it actually sets.
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- a scalar override for a key the defaults define as a map is rejected with
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a message naming the values path, instead of failing later with a template
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field error.
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- any other set value wins as given, including an explicit false or 0 —
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Helm's "default" and sprig's "mergeOverwrite" would both swallow those
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zero values, hence the explicit kindIs "invalid" nil check.
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- keys only present in the override are passed through unchanged.
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NOTE: like the helpers above, this is duplicated into every chart's
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templates/_helpers.tpl with the chart's name as define prefix, because charts
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in this repo deliberately have no dependencies.
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*/}}
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{{- define "zipline.defaultedDict" -}}
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{{- $defaults := .defaults | default dict -}}
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{{- $given := .given -}}
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{{- $path := .path | default "value" -}}
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{{- if kindIs "invalid" $given -}}
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{{- $given = dict -}}
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{{- end -}}
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{{- if not (kindIs "map" $given) -}}
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{{- fail (printf "%s must be a mapping or null, got %s (%v)" $path (kindOf $given) $given) -}}
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{{- end -}}
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{{- $out := deepCopy $defaults -}}
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{{- range $key, $value := $given -}}
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{{- if not (kindIs "invalid" $value) -}}
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{{- $default := index $defaults $key -}}
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{{- if and (kindIs "map" $value) (kindIs "map" $default) -}}
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{{- $_ := set $out $key (fromYaml (include "zipline.defaultedDict" (dict "defaults" $default "given" $value "path" (printf "%s.%s" $path $key)))) -}}
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{{- else if kindIs "map" $default -}}
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{{- fail (printf "%s.%s must be a mapping or null, got %s (%v)" $path $key (kindOf $value) $value) -}}
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{{- else -}}
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{{- $_ := set $out $key $value -}}
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{{- end -}}
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{{- end -}}
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{{- end -}}
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{{- toYaml $out -}}
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{{- end -}}
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{{/*
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Pick one sub-block out of a values block that may itself be null.
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Input: dict "block" <dict|nil> "key" <string> "path" <string>.
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Returns YAML of dict "value" <the sub-block, may be nil>, after rejecting a
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non-mapping block with a message that names the values path. Needed because
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".Values.zipline.securityContext" can itself be erased.
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*/}}
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{{- define "zipline.subBlock" -}}
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{{- $block := .block -}}
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{{- if kindIs "invalid" $block -}}
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{{- $block = dict -}}
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{{- end -}}
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{{- if not (kindIs "map" $block) -}}
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{{- fail (printf "%s must be a mapping or null, got %s (%v)" .path (kindOf $block) $block) -}}
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{{- end -}}
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{{- toYaml (dict "value" (index $block .key)) -}}
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{{- end -}}
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{{/*
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The effective security contexts, probes and resources (issue #99).
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The defaults below MUST stay in sync with the corresponding blocks in
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values.yaml, which stays the documented, user-facing place for them; this copy
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is only the fallback for the case where an override has erased the block.
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The probes address the container port by its name ("zipline-server"), so a
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rebuilt default probe needs no further context. Liveness deliberately uses "/"
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while readiness/startup use /api/healthcheck, which also checks the database —
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a database outage must not restart the pod.
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*/}}
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{{- define "zipline.podSecurityContext" -}}
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{{- $given := (fromYaml (include "zipline.subBlock" (dict "block" . "key" "pod" "path" "zipline.securityContext"))).value -}}
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{{- $defaults := dict
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"runAsNonRoot" true
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"runAsUser" 1000
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"runAsGroup" 1000
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"fsGroup" 1000
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"fsGroupChangePolicy" "Always"
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"seccompProfile" (dict "type" "RuntimeDefault") -}}
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{{- include "zipline.defaultedDict" (dict "defaults" $defaults "given" $given "path" "zipline.securityContext.pod") -}}
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{{- end -}}
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{{- define "zipline.containerSecurityContext" -}}
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{{- $given := (fromYaml (include "zipline.subBlock" (dict "block" . "key" "container" "path" "zipline.securityContext"))).value -}}
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{{- $defaults := dict
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"allowPrivilegeEscalation" false
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"readOnlyRootFilesystem" true
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"runAsNonRoot" true
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"capabilities" (dict "drop" (list "ALL")) -}}
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{{- include "zipline.defaultedDict" (dict "defaults" $defaults "given" $given "path" "zipline.securityContext.container") -}}
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{{- end -}}
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{{- define "zipline.livenessProbe" -}}
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{{- $defaults := dict
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"httpGet" (dict "path" "/" "port" "zipline-server")
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "zipline.defaultedDict" (dict "defaults" $defaults "given" . "path" "zipline.livenessProbe") -}}
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{{- end -}}
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{{- define "zipline.readinessProbe" -}}
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{{- $defaults := dict
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"httpGet" (dict "path" "/api/healthcheck" "port" "zipline-server")
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "zipline.defaultedDict" (dict "defaults" $defaults "given" . "path" "zipline.readinessProbe") -}}
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{{- end -}}
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{{- define "zipline.startupProbe" -}}
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{{- $defaults := dict
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"httpGet" (dict "path" "/api/healthcheck" "port" "zipline-server")
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 30 -}}
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{{- include "zipline.defaultedDict" (dict "defaults" $defaults "given" . "path" "zipline.startupProbe") -}}
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{{- end -}}
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{{/*
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The effective resources block, fed into the resources helper above so that an
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erased "resources:" still yields the chart's requests and computed limits
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instead of a container without any resource accounting.
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*/}}
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{{- define "zipline.effectiveResources" -}}
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{{- $defaults := dict
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"limitFactor" 3
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"requests" (dict "cpu" 0.1 "memory" "265Mi" "ephemeralStorage" "100Mi") -}}
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{{- $merged := fromYaml (include "zipline.defaultedDict" (dict "defaults" $defaults "given" . "path" "zipline.resources")) -}}
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{{- include "zipline.resources" $merged -}}
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{{- end -}}
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