jklein
c6583468c7
Teil von #157: multiplyQuantity turned every number from the null-safe fallback helpers into a float64 via fromYaml, and Go's "%v" switches float64 to exponential notation from about 1e6 upwards. A bare byte count like 1048576 became "1.048576e+06": the integer path aborted the render on the suffix check, while the non-integer path (a fractional limitFactor) rendered the invalid quantity silently and only failed at the API server. Both string conversions now go through the canonical formatNumber helper, identical to the fix already merged for template-chart, voucher-vault and zipline. Teil von #43: adds a NOTES.txt. minecraft-router has no Ingress and no URL, so the notes name the actual way in - the NodePort Service and the fact that the routing decision is made on the hostname from the Minecraft handshake - print the effective routing table, and state the traps: the nodePort outside the default range, mappings as the only source of routes (no Kubernetes auto-discovery in this chart), the restart a routing change costs, that a Ready router says nothing about any backend, and that API writes do not survive a restart. Conditional blocks for the out-of-range nodePort, scale-to-zero, more than one replica and server.env. No production domain anywhere; examples use example.com and cluster-internal names. Minor bump, appVersion unchanged.
302 lines
13 KiB
Smarty
302 lines
13 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 "minecraft-router.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 "minecraft-router.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 "minecraft-router.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 "minecraft-router.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 "minecraft-router.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 "minecraft-router.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 "minecraft-router.multiplyQuantity" -}}
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{{- $quantity := include "minecraft-router.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 "minecraft-router.formatNumber" $product) $suffix -}}
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{{- end -}}
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{{- end -}}
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{{/*
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Render a number as a plain decimal string, never in exponential notation.
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Why this exists (issue #157): the null-safe fallback helpers pass values
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through fromYaml, which parses every number as float64. Go's "%v" switches
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float64 to exponential notation from about 1e6 upwards, so a bare byte count
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like 1048576 became "1.048576e+06" - not a valid Kubernetes quantity, and the
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render aborted. Strings ("512Mi") are passed through untouched.
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*/}}
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{{- define "minecraft-router.formatNumber" -}}
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{{- if kindIs "float64" . -}}
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{{- regexReplaceAll "\\.?0+$" (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 "minecraft-router.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 "minecraft-router.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 "minecraft-router.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 "minecraft-router.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.server.securityContext" can itself be erased.
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*/}}
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{{- define "minecraft-router.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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Two things a rebuilt default probe must not lose:
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- the API port is addressed by NAME ("api-port"), not by number, so the probe
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keeps working if server.apiPort is overridden.
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- mc-router has no /health endpoint even in 1.46.4, so GET /routes is the
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health signal, and the "Accept: application/json" header belongs to it (it
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was mandatory in 1.25.1 and is the correct request for a JSON endpoint).
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The pod context deliberately pins uid/gid 10000 even though the image declares
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USER 65532 since 1.46.0, so the runtime identity does not silently change with
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the base image.
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*/}}
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{{- define "minecraft-router.podSecurityContext" -}}
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{{- $given := (fromYaml (include "minecraft-router.subBlock" (dict "block" . "key" "pod" "path" "server.securityContext"))).value -}}
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{{- $defaults := dict
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"runAsNonRoot" true
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"runAsUser" 10000
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"runAsGroup" 10000
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"fsGroup" 10000
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"fsGroupChangePolicy" "Always"
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"seccompProfile" (dict "type" "RuntimeDefault") -}}
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{{- include "minecraft-router.defaultedDict" (dict "defaults" $defaults "given" $given "path" "server.securityContext.pod") -}}
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{{- end -}}
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{{- define "minecraft-router.containerSecurityContext" -}}
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{{- $given := (fromYaml (include "minecraft-router.subBlock" (dict "block" . "key" "container" "path" "server.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") "add" (list)) -}}
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{{- include "minecraft-router.defaultedDict" (dict "defaults" $defaults "given" $given "path" "server.securityContext.container") -}}
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{{- end -}}
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{{- define "minecraft-router.probeHttpGet" -}}
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{{- dict "path" "/routes" "port" "api-port" "httpHeaders" (list (dict "name" "Accept" "value" "application/json")) | toYaml -}}
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{{- end -}}
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{{- define "minecraft-router.livenessProbe" -}}
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{{- $defaults := dict
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"httpGet" (fromYaml (include "minecraft-router.probeHttpGet" .))
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "minecraft-router.defaultedDict" (dict "defaults" $defaults "given" . "path" "server.livenessProbe") -}}
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{{- end -}}
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{{- define "minecraft-router.readinessProbe" -}}
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{{- $defaults := dict
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"httpGet" (fromYaml (include "minecraft-router.probeHttpGet" .))
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "minecraft-router.defaultedDict" (dict "defaults" $defaults "given" . "path" "server.readinessProbe") -}}
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{{- end -}}
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{{- define "minecraft-router.startupProbe" -}}
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{{- $defaults := dict
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"httpGet" (fromYaml (include "minecraft-router.probeHttpGet" .))
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"periodSeconds" 2
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"timeoutSeconds" 5
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"failureThreshold" 15 -}}
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{{- include "minecraft-router.defaultedDict" (dict "defaults" $defaults "given" . "path" "server.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 "minecraft-router.effectiveResources" -}}
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{{- $defaults := dict
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"limitFactor" 3
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"requests" (dict "cpu" "100m" "memory" "50Mi" "ephemeral-storage" "50Mi") -}}
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{{- $merged := fromYaml (include "minecraft-router.defaultedDict" (dict "defaults" $defaults "given" . "path" "server.resources")) -}}
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{{- include "minecraft-router.resources" $merged -}}
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{{- end -}}
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