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cdd9464f9a
This is part of a general effort to move all of Terraform's non-library package surface under internal in order to reinforce that these are for internal use within Terraform only. If you were previously importing packages under this prefix into an external codebase, you could pin to an earlier release tag as an interim solution until you've make a plan to achieve the same functionality some other way.
75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
package repl
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import (
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"strings"
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"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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"github.com/hashicorp/terraform/internal/lang"
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"github.com/hashicorp/terraform/internal/tfdiags"
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)
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// Session represents the state for a single REPL session.
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type Session struct {
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// Scope is the evaluation scope where expressions will be evaluated.
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Scope *lang.Scope
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}
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// Handle handles a single line of input from the REPL.
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//
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// This is a stateful operation if a command is given (such as setting
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// a variable). This function should not be called in parallel.
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//
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// The return value is the output and the error to show.
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func (s *Session) Handle(line string) (string, bool, tfdiags.Diagnostics) {
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switch {
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case strings.TrimSpace(line) == "":
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return "", false, nil
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case strings.TrimSpace(line) == "exit":
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return "", true, nil
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case strings.TrimSpace(line) == "help":
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ret, diags := s.handleHelp()
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return ret, false, diags
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default:
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ret, diags := s.handleEval(line)
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return ret, false, diags
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}
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}
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func (s *Session) handleEval(line string) (string, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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// Parse the given line as an expression
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expr, parseDiags := hclsyntax.ParseExpression([]byte(line), "<console-input>", hcl.Pos{Line: 1, Column: 1})
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diags = diags.Append(parseDiags)
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if parseDiags.HasErrors() {
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return "", diags
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}
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val, valDiags := s.Scope.EvalExpr(expr, cty.DynamicPseudoType)
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diags = diags.Append(valDiags)
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if valDiags.HasErrors() {
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return "", diags
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}
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return FormatValue(val, 0), diags
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}
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func (s *Session) handleHelp() (string, tfdiags.Diagnostics) {
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text := `
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The Terraform console allows you to experiment with Terraform interpolations.
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You may access resources in the state (if you have one) just as you would
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from a configuration. For example: "aws_instance.foo.id" would evaluate
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to the ID of "aws_instance.foo" if it exists in your state.
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Type in the interpolation to test and hit <enter> to see the result.
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To exit the console, type "exit" and hit <enter>, or use Control-C or
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Control-D.
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`
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return strings.TrimSpace(text), nil
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}
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