mirror of
https://github.com/prometheus/prometheus.git
synced 2025-03-05 20:59:13 -08:00
145 lines
2.8 KiB
Go
145 lines
2.8 KiB
Go
// Copyright 2018 The Prometheus Authors
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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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//go:build ignore
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// +build ignore
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package main
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"strings"
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)
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var (
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OUTPUT_FILE = "assets.go"
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PREFIX = "//go:embed "
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)
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var HEADER = []byte(`package ui
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import (
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"io"
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"io/fs"
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"time"
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)
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type FSEntry struct {
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n string
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v []byte
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offset int
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}
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func (f *FSEntry) Name() string {
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return f.n
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}
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func (f *FSEntry) Size() int64 {
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return int64(len(f.v))
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}
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func (f *FSEntry) Mode() fs.FileMode {
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return fs.ModeDevice
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}
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func (f *FSEntry) ModTime() time.Time {
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return time.Time{}
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}
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func (f *FSEntry) IsDir() bool { return false }
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func (f *FSEntry) Sys() interface{} { return nil } // TODO: update to any from interface{}
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func (f *FSEntry) Stat() (fs.FileInfo, error) {
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return f, nil
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}
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func (f *FSEntry) Read(buf []byte) (int, error) {
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if len(buf) > len(f.v) -f.offset{
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buf = buf[0:len(f.v[f.offset:])]
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}
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n := copy(buf, f.v[f.offset:])
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if n == len(f.v)-f.offset {
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return n, io.EOF
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}
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f.offset += n
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return n, nil
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}
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func (f *FSEntry) Close() error { return nil }
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type FSMap map[string][]byte
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func (f FSMap) Open(name string) (fs.File, error) {
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v, ok := f[name]
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if !ok {
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return nil, fs.ErrNotExist
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}
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return &FSEntry{n: name, v:v}, nil
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}
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var fsMap = FSMap{
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`)
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var TRAILER = []byte(`}`)
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func check(e error) {
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if e != nil {
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log.Fatal(e)
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}
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}
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func main() {
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// Find the files to load from embed.go
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b, err := ioutil.ReadFile("embed.go")
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check(err)
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bLines := bytes.Split(b, []byte("\n"))
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var filesToLoad []string
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// parse the lines looking for the embed header -- to find our list
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for _, l := range bLines {
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if bytes.HasPrefix(l, []byte(PREFIX)) {
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fmt.Println(string(l))
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s := string(bytes.TrimPrefix(l, []byte(PREFIX)))
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filesToLoad = strings.Split(s, " ")
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break
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}
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}
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f, err := os.Create(OUTPUT_FILE)
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check(err)
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defer f.Close()
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_, err = f.Write(HEADER)
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check(err)
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fmt.Println("files to load", filesToLoad)
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for _, fn := range filesToLoad {
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fmt.Println(fn) // TODO: remove
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// Read file contents
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b, err := ioutil.ReadFile(fn)
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check(err)
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_, err = fmt.Fprintf(f, "\t\"%s\": []byte(%q),\n", fn, b)
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check(err)
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}
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_, err = f.Write(TRAILER)
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check(err)
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}
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