|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + _ "embed" |
| 6 | + "encoding/json" |
| 7 | + "fmt" |
| 8 | + "go/format" |
| 9 | + "io/ioutil" |
| 10 | + "log" |
| 11 | + "os" |
| 12 | + "path/filepath" |
| 13 | + "runtime" |
| 14 | + "sort" |
| 15 | + "strings" |
| 16 | + "text/template" |
| 17 | +) |
| 18 | + |
| 19 | +//go:embed resources/bigquery-api.json |
| 20 | +var bigqueryAPIJSON []byte |
| 21 | + |
| 22 | +func main() { |
| 23 | + if err := run(os.Args); err != nil { |
| 24 | + log.Fatalf("%+v", err) |
| 25 | + } |
| 26 | +} |
| 27 | + |
| 28 | +type BigQueryAPI struct { |
| 29 | + Resources map[string]*Resource `json:"resources"` |
| 30 | +} |
| 31 | + |
| 32 | +type Resource struct { |
| 33 | + Methods map[string]*Method `json:"methods"` |
| 34 | +} |
| 35 | + |
| 36 | +type Method struct { |
| 37 | + HTTPMethod string `json:"httpMethod"` |
| 38 | + Parameters map[string]*Parameter `json:"parameters"` |
| 39 | + Path string `json:"path"` |
| 40 | + FlatPath string `json:"flatPath"` |
| 41 | + Scope []string `json:"scope"` |
| 42 | +} |
| 43 | + |
| 44 | +type Parameter struct { |
| 45 | + Type string `json:"type"` |
| 46 | + Location string `json:"location"` |
| 47 | + Required bool `json:"required"` |
| 48 | +} |
| 49 | + |
| 50 | +type handlerParam struct { |
| 51 | + Path string |
| 52 | + HTTPMethod string |
| 53 | + HandlerName string |
| 54 | +} |
| 55 | + |
| 56 | +func run(args []string) error { |
| 57 | + var v BigQueryAPI |
| 58 | + if err := json.Unmarshal(bigqueryAPIJSON, &v); err != nil { |
| 59 | + return err |
| 60 | + } |
| 61 | + tmpl, err := template.New("").Parse(`// Code generated by internal/cmd/generator. DO NOT EDIT! |
| 62 | +package server |
| 63 | +
|
| 64 | +import "net/http" |
| 65 | +
|
| 66 | +type Handler struct { |
| 67 | + Path string |
| 68 | + HTTPMethod string |
| 69 | + Handler http.Handler |
| 70 | +} |
| 71 | +
|
| 72 | +var handlers = []*Handler{ |
| 73 | +{{- range . }} |
| 74 | + { |
| 75 | + Path: "{{ .Path }}", |
| 76 | + HTTPMethod: "{{ .HTTPMethod }}", |
| 77 | + Handler: &{{ .HandlerName }}Handler{}, |
| 78 | + }, |
| 79 | +{{- end }} |
| 80 | +} |
| 81 | +
|
| 82 | +var ( |
| 83 | +{{- range . }} |
| 84 | + _ http.Handler = &{{ .HandlerName }}Handler{} |
| 85 | +{{- end }} |
| 86 | +) |
| 87 | +
|
| 88 | +{{- range . }} |
| 89 | +type {{ .HandlerName }}Handler struct { |
| 90 | +} |
| 91 | +{{ end }} |
| 92 | +`) |
| 93 | + handlerParams := []*handlerParam{} |
| 94 | + for resourceName, resource := range v.Resources { |
| 95 | + for methodName, method := range resource.Methods { |
| 96 | + path := method.FlatPath |
| 97 | + if path == "" { |
| 98 | + path = method.Path |
| 99 | + } |
| 100 | + if !strings.HasPrefix(path, "/") { |
| 101 | + path = "/" + path |
| 102 | + } |
| 103 | + camelName := strings.ToUpper(string(methodName[0])) + methodName[1:] |
| 104 | + handlerParams = append(handlerParams, &handlerParam{ |
| 105 | + Path: path, |
| 106 | + HTTPMethod: method.HTTPMethod, |
| 107 | + HandlerName: fmt.Sprintf("%s%s", resourceName, camelName), |
| 108 | + }) |
| 109 | + } |
| 110 | + } |
| 111 | + sort.Slice(handlerParams, func(i, j int) bool { |
| 112 | + return handlerParams[i].HandlerName < handlerParams[j].HandlerName |
| 113 | + }) |
| 114 | + var b bytes.Buffer |
| 115 | + if err := tmpl.Execute(&b, handlerParams); err != nil { |
| 116 | + return err |
| 117 | + } |
| 118 | + path := filepath.Join(repoRoot(), "server", "handler_gen.go") |
| 119 | + buf, err := format.Source(b.Bytes()) |
| 120 | + if err != nil { |
| 121 | + return err |
| 122 | + } |
| 123 | + return ioutil.WriteFile(path, buf, 0644) |
| 124 | +} |
| 125 | + |
| 126 | +func repoRoot() string { |
| 127 | + _, file, _, _ := runtime.Caller(0) |
| 128 | + relativePathFromRepoRoot := filepath.Join("internal", "cmd", "generator") |
| 129 | + return strings.TrimSuffix(filepath.Dir(file), relativePathFromRepoRoot) |
| 130 | +} |
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