86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
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package instances
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import (
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"fmt"
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"sort"
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"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/terraform/addrs"
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)
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// expansion is an internal interface used to represent the different
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// ways expansion can operate depending on how repetition is configured for
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// an object.
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type expansion interface {
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instanceKeys() []addrs.InstanceKey
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repetitionData(addrs.InstanceKey) RepetitionData
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}
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// expansionSingle is the expansion corresponding to no repetition arguments
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// at all, producing a single object with no key.
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//
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// expansionSingleVal is the only valid value of this type.
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type expansionSingle uintptr
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var singleKeys = []addrs.InstanceKey{addrs.NoKey}
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var expansionSingleVal expansionSingle
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func (e expansionSingle) instanceKeys() []addrs.InstanceKey {
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return singleKeys
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}
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func (e expansionSingle) repetitionData(key addrs.InstanceKey) RepetitionData {
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if key != addrs.NoKey {
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panic("cannot use instance key with non-repeating object")
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}
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return RepetitionData{}
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}
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// expansionCount is the expansion corresponding to the "count" argument.
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type expansionCount int
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func (e expansionCount) instanceKeys() []addrs.InstanceKey {
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ret := make([]addrs.InstanceKey, int(e))
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for i := range ret {
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ret[i] = addrs.IntKey(i)
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}
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return ret
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}
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func (e expansionCount) repetitionData(key addrs.InstanceKey) RepetitionData {
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i := int(key.(addrs.IntKey))
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if i < 0 || i >= int(e) {
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panic(fmt.Sprintf("instance key %d out of range for count %d", i, e))
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}
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return RepetitionData{
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CountIndex: cty.NumberIntVal(int64(i)),
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}
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}
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// expansionForEach is the expansion corresponding to the "for_each" argument.
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type expansionForEach map[string]cty.Value
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func (e expansionForEach) instanceKeys() []addrs.InstanceKey {
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ret := make([]addrs.InstanceKey, 0, len(e))
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for k := range e {
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ret = append(ret, addrs.StringKey(k))
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}
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sort.Slice(ret, func(i, j int) bool {
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return ret[i].(addrs.StringKey) < ret[j].(addrs.StringKey)
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})
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return ret
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}
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func (e expansionForEach) repetitionData(key addrs.InstanceKey) RepetitionData {
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k := string(key.(addrs.StringKey))
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v, ok := e[k]
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if !ok {
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panic(fmt.Sprintf("instance key %q does not match any instance", k))
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}
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return RepetitionData{
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EachKey: cty.StringVal(k),
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EachValue: v,
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}
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}
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