69 lines
2.2 KiB
Go
69 lines
2.2 KiB
Go
package backend
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import (
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"context"
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opentracing "github.com/opentracing/opentracing-go"
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"github.com/pulumi/pulumi/pkg/v3/backend/display"
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"github.com/pulumi/pulumi/pkg/v3/engine"
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"github.com/pulumi/pulumi/sdk/v3/go/common/util/result"
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)
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type MakeQuery func(context.Context, QueryOperation) (engine.QueryInfo, error)
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// RunQuery executes a query program against the resource outputs of a locally hosted stack.
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func RunQuery(ctx context.Context, b Backend, op QueryOperation,
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callerEventsOpt chan<- engine.Event, newQuery MakeQuery) result.Result {
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q, err := newQuery(ctx, op)
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if err != nil {
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return result.FromError(err)
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}
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// Render query output to CLI.
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displayEvents := make(chan engine.Event)
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displayDone := make(chan bool)
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go display.ShowQueryEvents("running query", displayEvents, displayDone, op.Opts.Display)
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// The engineEvents channel receives all events from the engine, which we then forward onto other
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// channels for actual processing. (displayEvents and callerEventsOpt.)
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engineEvents := make(chan engine.Event)
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eventsDone := make(chan bool)
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go func() {
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for e := range engineEvents {
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displayEvents <- e
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if callerEventsOpt != nil {
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callerEventsOpt <- e
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}
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}
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close(eventsDone)
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}()
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// Depending on the action, kick off the relevant engine activity. Note that we don't immediately check and
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// return error conditions, because we will do so below after waiting for the display channels to close.
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cancellationScope := op.Scopes.NewScope(engineEvents, true /*dryRun*/)
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engineCtx := &engine.Context{
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Cancel: cancellationScope.Context(),
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Events: engineEvents,
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BackendClient: NewBackendClient(b),
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}
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if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
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engineCtx.ParentSpan = parentSpan.Context()
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}
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res := engine.Query(engineCtx, q, op.Opts.Engine)
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// Wait for dependent channels to finish processing engineEvents before closing.
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<-displayDone
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cancellationScope.Close() // Don't take any cancellations anymore, we're shutting down.
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close(engineEvents)
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// Make sure that the goroutine writing to displayEvents and callerEventsOpt
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// has exited before proceeding
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<-eventsDone
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close(displayEvents)
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return res
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}
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