mirror of https://github.com/knative/caching.git
110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
/*
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Copyright 2019 The Knative 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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// Package client supports various needs for running tests
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package client
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import (
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"encoding/json"
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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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"path"
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"knative.dev/pkg/test/prow"
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)
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const (
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filename = "metadata.json"
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)
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// client holds metadata as a string:string map, as well as path for storing
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// metadata
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type client struct {
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MetaData map[string]string
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Path string
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}
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// NewClient creates a client, takes custom directory for storing `metadata.json`.
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// It reads existing `metadata.json` file if it exists, otherwise creates it.
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// Errors out if there is any file i/o problem other than file not exist error.
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func NewClient(dir string) (*client, error) {
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c := &client{
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MetaData: make(map[string]string),
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}
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if dir == "" {
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log.Println("Getting artifacts dir from prow")
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dir = prow.GetLocalArtifactsDir()
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}
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c.Path = path.Join(dir, filename)
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if _, err := os.Stat(dir); os.IsNotExist(err) {
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if err = os.MkdirAll(dir, 0777); err != nil {
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return nil, fmt.Errorf("Failed to create directory: %v", err)
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}
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}
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return c, nil
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}
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// sync is shared by Get and Set, invoked at the very beginning of each, makes
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// sure the file exists, and loads the content of file into c.MetaData
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func (c *client) sync() error {
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_, err := os.Stat(c.Path)
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if os.IsNotExist(err) {
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body, _ := json.Marshal(&c.MetaData)
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err = ioutil.WriteFile(c.Path, body, 0777)
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} else {
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var body []byte
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body, err = ioutil.ReadFile(c.Path)
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if err == nil {
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err = json.Unmarshal(body, &c.MetaData)
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}
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}
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return err
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}
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// Set sets key:val pair, and overrides if it exists
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func (c *client) Set(key, val string) error {
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err := c.sync()
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if err != nil {
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return err
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}
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if oldVal, ok := c.MetaData[key]; ok {
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log.Printf("Overriding meta %q:%q with new value %q", key, oldVal, val)
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}
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c.MetaData[key] = val
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body, _ := json.Marshal(c.MetaData)
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return ioutil.WriteFile(c.Path, body, 0777)
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}
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// Get gets val for key
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func (c *client) Get(key string) (string, error) {
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if _, err := os.Stat(c.Path); err != nil && os.IsNotExist(err) {
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return "", fmt.Errorf("file %q doesn't exist", c.Path)
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}
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var res string
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err := c.sync()
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if err == nil {
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if val, ok := c.MetaData[key]; ok {
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res = val
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} else {
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err = fmt.Errorf("key %q doesn't exist", key)
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}
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}
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return res, err
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}
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