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// Copyright 2018 Google Inc.
//
// 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.
//go:build !windows
// +build !windows
package renameio_test
import (
"fmt"
"log"
"github.com/google/renameio/v2"
)
func ExampleTempFile_justone() {
persist := func(temperature float64) error {
t, err := renameio.TempFile("", "/srv/www/metrics.txt")
if err != nil {
return err
}
defer t.Cleanup()
if _, err := fmt.Fprintf(t, "temperature_degc %f\n", temperature); err != nil {
return err
}
return t.CloseAtomicallyReplace()
}
// Thanks to the write package, a webserver exposing /srv/www never
// serves an incomplete or missing file.
if err := persist(31.2); err != nil {
log.Fatal(err)
}
}
func ExampleTempFile_many() {
// Prepare for writing files to /srv/www, effectively caching calls to
// TempDir which TempFile would otherwise need to make.
dir := renameio.TempDir("/srv/www")
persist := func(temperature float64) error {
t, err := renameio.TempFile(dir, "/srv/www/metrics.txt")
if err != nil {
return err
}
defer t.Cleanup()
if _, err := fmt.Fprintf(t, "temperature_degc %f\n", temperature); err != nil {
return err
}
return t.CloseAtomicallyReplace()
}
// Imagine this was an endless loop, reading temperature sensor values.
// Thanks to the write package, a webserver exposing /srv/www never
// serves an incomplete or missing file.
for {
if err := persist(31.2); err != nil {
log.Fatal(err)
}
}
}
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