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main.go
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main.go
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// Copyright Axis Communications AB.
//
// For a full list of individual contributors, please see the commit history.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
_ "embed"
"fmt"
"log"
"os"
"path/filepath"
"text/template"
"github.com/Masterminds/semver"
"github.com/tidwall/gjson"
"github.com/eiffel-community/eiffelevents-sdk-go"
"github.com/eiffel-community/eiffelevents-sdk-go/internal/codetemplate"
)
type tableEntry struct {
Filename string
StructName string
}
//go:embed templates/roundtriptable.tmpl
var tableFileTemplate string
func generateExampleTable(exampleDir string, output *codetemplate.OutputFile) error {
filenames, err := filepath.Glob(filepath.Join(exampleDir, "*/*.json"))
if err != nil {
return err
}
var table []tableEntry
for _, filename := range filenames {
eventExample, err := os.ReadFile(filename)
if err != nil {
return err
}
// Extract the event type and version from the JSON payload.
schemaSelectors := gjson.GetManyBytes(eventExample, "meta.type", "meta.version")
metaType := schemaSelectors[0].String()
if metaType == "" {
return fmt.Errorf("unable to extract meta.type from input file %s", filename)
}
metaVersion := schemaSelectors[1].String()
if metaVersion == "" {
return fmt.Errorf("unable to extract meta.version from input file %s", filename)
}
v, err := semver.NewVersion(metaVersion)
if err != nil {
return fmt.Errorf("error parsing %q version: %w", metaVersion, err)
}
table = append(table, tableEntry{filename, eiffelevents.VersionedStructName(metaType, v)})
}
return output.ExpandTemplate(tableFileTemplate, table, template.FuncMap{})
}
func main() {
if len(os.Args) < 3 {
log.Fatalf("Usage: %s EXAMPLE_DIR OUTPUT_FILE", filepath.Base(os.Args[0]))
}
output := codetemplate.New(os.Args[2])
if err := generateExampleTable(os.Args[1], output); err != nil {
log.Fatalf("Error generating code: %s", err)
}
if err := output.Close(); err != nil {
log.Fatalf("Error writing final output file: %s", err)
}
}