dff1299be4
Add a new package, `codegen/importer`, that can generate definitions for resource states in PCL or TS/Python/C#/Go. The pipeline is relatively simple: given a list of resource states, generate a PCL program in memory, bind it, and pass it to the language-specific code generator. This builds upon the existing PCL IR, and can be used with the currently supported code generators. Related to #1635.
108 lines
3.3 KiB
Go
108 lines
3.3 KiB
Go
// Copyright 2016-2020, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package importer
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import (
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"bytes"
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"fmt"
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"io"
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"github.com/hashicorp/hcl/v2"
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"github.com/pulumi/pulumi/pkg/v2/codegen/hcl2"
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"github.com/pulumi/pulumi/pkg/v2/codegen/hcl2/syntax"
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"github.com/pulumi/pulumi/pkg/v2/codegen/schema"
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"github.com/pulumi/pulumi/sdk/v2/go/common/resource"
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"github.com/pulumi/pulumi/sdk/v2/go/common/util/contract"
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)
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// A LangaugeGenerator generates code for a given Pulumi program to an io.Writer.
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type LanguageGenerator func(w io.Writer, p *hcl2.Program) error
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// A NameTable maps URNs to language-specific variable names.
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type NameTable map[resource.URN]string
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// A DiagnosticsError captures HCL2 diagnostics.
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type DiagnosticsError struct {
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diagnostics hcl.Diagnostics
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newDiagnosticWriter func(w io.Writer, width uint, color bool) hcl.DiagnosticWriter
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}
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func (e *DiagnosticsError) Diagnostics() hcl.Diagnostics {
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return e.diagnostics
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}
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// NewDiagnosticWriter returns an hcl.DiagnosticWriter that can be used to render the error's diagnostics.
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func (e *DiagnosticsError) NewDiagnosticWriter(w io.Writer, width uint, color bool) hcl.DiagnosticWriter {
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return e.newDiagnosticWriter(w, width, color)
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}
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func (e *DiagnosticsError) Error() string {
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var text bytes.Buffer
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err := e.NewDiagnosticWriter(&text, 0, false).WriteDiagnostics(e.diagnostics)
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contract.IgnoreError(err)
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return text.String()
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}
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func (e *DiagnosticsError) String() string {
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return e.Error()
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}
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// GenerateLanguageDefintions generates a list of resource definitions from the given resource states.
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func GenerateLanguageDefinitions(w io.Writer, loader schema.Loader, gen LanguageGenerator, states []*resource.State,
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names NameTable) error {
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var hcl2Text bytes.Buffer
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for i, state := range states {
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hcl2Def, err := GenerateHCL2Definition(loader, state, names)
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if err != nil {
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return err
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}
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pre := ""
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if i > 0 {
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pre = "\n"
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}
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_, err = fmt.Fprintf(&hcl2Text, "%s%v", pre, hcl2Def)
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contract.IgnoreError(err)
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}
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parser := syntax.NewParser()
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if err := parser.ParseFile(&hcl2Text, string("anonymous.pp")); err != nil {
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return err
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}
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if parser.Diagnostics.HasErrors() {
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// HCL2 text generation should always generate proper code.
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return fmt.Errorf("internal error: %w", &DiagnosticsError{
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diagnostics: parser.Diagnostics,
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newDiagnosticWriter: parser.NewDiagnosticWriter,
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})
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}
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program, diags, err := hcl2.BindProgram(parser.Files, hcl2.Loader(loader), hcl2.AllowMissingVariables)
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if err != nil {
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return err
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}
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if diags.HasErrors() {
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// It is possible that the provided states do not contain appropriately-shaped inputs, so this may be user
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// error.
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return &DiagnosticsError{
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diagnostics: diags,
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newDiagnosticWriter: program.NewDiagnosticWriter,
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}
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}
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return gen(w, program)
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}
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