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78 lines
2.6 KiB
Go
78 lines
2.6 KiB
Go
package terraform
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import (
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"fmt"
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"log"
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"github.com/hashicorp/terraform/addrs"
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"github.com/hashicorp/terraform/configs"
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)
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// EvalCountFixZeroOneBoundaryGlobal is an EvalNode that fixes up the state
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// when there is a resource count with zero/one boundary, i.e. fixing
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// a resource named "aws_instance.foo" to "aws_instance.foo.0" and vice-versa.
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//
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// This works on the global state.
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type EvalCountFixZeroOneBoundaryGlobal struct {
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Config *configs.Config
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}
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// TODO: test
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func (n *EvalCountFixZeroOneBoundaryGlobal) Eval(ctx EvalContext) (interface{}, error) {
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// We'll temporarily lock the state to grab the modules, then work on each
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// one separately while taking a lock again for each separate resource.
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// This means that if another caller concurrently adds a module here while
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// we're working then we won't update it, but that's no worse than the
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// concurrent writer blocking for our entire fixup process and _then_
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// adding a new module, and in practice the graph node associated with
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// this eval depends on everything else in the graph anyway, so there
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// should not be concurrent writers.
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state := ctx.State().Lock()
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moduleAddrs := make([]addrs.ModuleInstance, 0, len(state.Modules))
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for _, m := range state.Modules {
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moduleAddrs = append(moduleAddrs, m.Addr)
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}
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ctx.State().Unlock()
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for _, addr := range moduleAddrs {
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cfg := n.Config.DescendentForInstance(addr)
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if cfg == nil {
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log.Printf("[WARN] Not fixing up EachModes for %s because it has no config", addr)
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continue
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}
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if err := n.fixModule(ctx, addr); err != nil {
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return nil, err
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}
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}
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return nil, nil
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}
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func (n *EvalCountFixZeroOneBoundaryGlobal) fixModule(ctx EvalContext, moduleAddr addrs.ModuleInstance) error {
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ms := ctx.State().Module(moduleAddr)
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cfg := n.Config.DescendentForInstance(moduleAddr)
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if ms == nil {
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// Theoretically possible for a concurrent writer to delete a module
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// while we're running, but in practice the graph node that called us
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// depends on everything else in the graph and so there can never
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// be a concurrent writer.
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return fmt.Errorf("[WARN] no state found for %s while trying to fix up EachModes", moduleAddr)
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}
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if cfg == nil {
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return fmt.Errorf("[WARN] no config found for %s while trying to fix up EachModes", moduleAddr)
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}
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for _, r := range ms.Resources {
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addr := r.Addr.Absolute(moduleAddr)
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rCfg := cfg.Module.ResourceByAddr(r.Addr)
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if rCfg == nil {
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log.Printf("[WARN] Not fixing up EachModes for %s because it has no config", addr)
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continue
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}
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hasCount := rCfg.Count != nil
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fixResourceCountSetTransition(ctx, addr, hasCount)
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}
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return nil
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}
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