feat: add autoscaling configuration for prebuilds #408
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| Original file line number | Diff line number | Diff line change | ||||
|---|---|---|---|---|---|---|
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@@ -3,13 +3,18 @@ package provider | |||||
| import ( | ||||||
| "context" | ||||||
| "fmt" | ||||||
| "strings" | ||||||
| "time" | ||||||
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|
||||||
| "github.com/hashicorp/terraform-plugin-sdk/v2/diag" | ||||||
| "github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema" | ||||||
| "github.com/hashicorp/terraform-plugin-sdk/v2/helper/validation" | ||||||
| "github.com/mitchellh/mapstructure" | ||||||
| rbcron "github.com/robfig/cron/v3" | ||||||
| ) | ||||||
|
|
||||||
| var PrebuildsCRONParser = rbcron.NewParser(rbcron.Minute | rbcron.Hour | rbcron.Dom | rbcron.Month | rbcron.Dow) | ||||||
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|
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| type WorkspacePreset struct { | ||||||
| Name string `mapstructure:"name"` | ||||||
| Parameters map[string]string `mapstructure:"parameters"` | ||||||
|
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@@ -29,12 +34,23 @@ type WorkspacePrebuild struct { | |||||
| // for utilities that parse our terraform output using this type. To remain compatible | ||||||
| // with those cases, we use a slice here. | ||||||
| ExpirationPolicy []ExpirationPolicy `mapstructure:"expiration_policy"` | ||||||
| Autoscaling []Autoscaling `mapstructure:"autoscaling"` | ||||||
| } | ||||||
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| type ExpirationPolicy struct { | ||||||
| TTL int `mapstructure:"ttl"` | ||||||
| } | ||||||
|
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| type Autoscaling struct { | ||||||
| Timezone string `mapstructure:"timezone"` | ||||||
| Schedule []Schedule `mapstructure:"schedule"` | ||||||
| } | ||||||
|
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| type Schedule struct { | ||||||
| Cron string `mapstructure:"cron"` | ||||||
| Instances int `mapstructure:"instances"` | ||||||
| } | ||||||
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||||||
| func workspacePresetDataSource() *schema.Resource { | ||||||
| return &schema.Resource{ | ||||||
| SchemaVersion: 1, | ||||||
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@@ -119,9 +135,82 @@ func workspacePresetDataSource() *schema.Resource { | |||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| "autoscaling": { | ||||||
| Type: schema.TypeList, | ||||||
| Description: "Configuration block that defines autoscaling behavior for prebuilds. Use this to automatically adjust the number of prebuild instances based on a schedule.", | ||||||
| Optional: true, | ||||||
| MaxItems: 1, | ||||||
| Elem: &schema.Resource{ | ||||||
| Schema: map[string]*schema.Schema{ | ||||||
| "timezone": { | ||||||
| Type: schema.TypeString, | ||||||
| Description: "The timezone to use for the autoscaling schedule (e.g., \"UTC\", \"America/New_York\").", | ||||||
|
There was a problem hiding this comment. Nit: can you include a link to an acceptable list of TZs here? I think https://en.wikipedia.org/wiki/List_of_tz_database_time_zones suffices but I'm not sure. https://pkg.go.dev/time#LoadLocation says it references the "IANA Time Zone database". |
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| Required: true, | ||||||
| ValidateFunc: func(val interface{}, key string) ([]string, []error) { | ||||||
| timezone := val.(string) | ||||||
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| _, err := time.LoadLocation(timezone) | ||||||
| if err != nil { | ||||||
| return nil, []error{fmt.Errorf("failed to load location: %w", err)} | ||||||
|
There was a problem hiding this comment.
Suggested change
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| } | ||||||
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| return nil, nil | ||||||
| }, | ||||||
| }, | ||||||
| "schedule": { | ||||||
| Type: schema.TypeList, | ||||||
| Description: "One or more schedule blocks that define when to scale the number of prebuild instances.", | ||||||
| Required: true, | ||||||
| MinItems: 1, | ||||||
| Elem: &schema.Resource{ | ||||||
| Schema: map[string]*schema.Schema{ | ||||||
| "cron": { | ||||||
| Type: schema.TypeString, | ||||||
| Description: "A cron expression that defines when this schedule should be active. The cron expression must be in the format \"* HOUR * * DAY-OF-WEEK\" where HOUR is 0-23 and DAY-OF-WEEK is 0-6 (Sunday-Saturday). The minute, day-of-month, and month fields must be \"*\".", | ||||||
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There was a problem hiding this comment. Why must day-of-month and month be |
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| Required: true, | ||||||
| ValidateFunc: func(val interface{}, key string) ([]string, []error) { | ||||||
| cronSpec := val.(string) | ||||||
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| err := validatePrebuildsCronSpec(cronSpec) | ||||||
| if err != nil { | ||||||
| return nil, []error{fmt.Errorf("cron spec failed validation: %w", err)} | ||||||
| } | ||||||
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| _, err = PrebuildsCRONParser.Parse(cronSpec) | ||||||
| if err != nil { | ||||||
| return nil, []error{fmt.Errorf("failed to parse cron spec: %w", err)} | ||||||
| } | ||||||
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| return nil, nil | ||||||
| }, | ||||||
| }, | ||||||
| "instances": { | ||||||
| Type: schema.TypeInt, | ||||||
| Description: "The number of prebuild instances to maintain during this schedule period.", | ||||||
| Required: true, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| }, | ||||||
| } | ||||||
| } | ||||||
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| // validatePrebuildsCronSpec ensures that the minute, day-of-month and month options of spec are all set to * | ||||||
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There was a problem hiding this comment. It'd be good to add the why here, not just the what. |
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| func validatePrebuildsCronSpec(spec string) error { | ||||||
| parts := strings.Fields(spec) | ||||||
|
There was a problem hiding this comment. Howcome we don't use |
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| if len(parts) != 5 { | ||||||
| return fmt.Errorf("cron specification should consist of 5 fields") | ||||||
| } | ||||||
| if parts[0] != "*" || parts[2] != "*" || parts[3] != "*" { | ||||||
| return fmt.Errorf("minute, day-of-month and month should be *") | ||||||
| } | ||||||
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| return nil | ||||||
| } | ||||||
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I love that we explicitly don't have a default value here 👍 nice.