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gcp.go
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gcp.go
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/* ****************************************************************************
* Copyright 2020 51 Degrees Mobile Experts Limited (51degrees.com)
*
* 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 owid
import (
"context"
"fmt"
"log"
"sync"
"time"
"cloud.google.com/go/firestore"
firebase "firebase.google.com/go"
"google.golang.org/api/iterator"
)
// Connect to GCP Firebase. Concrete implementation of store.go
// Firebase is a implementation of owid.Store for GCP's Firebase.
type Firebase struct {
timestamp time.Time // The last time the maps were refreshed
client *firestore.Client // Firebase app
common
}
// Fireitem is the Firestore table item representation of a Creator
type Fireitem struct {
Domain string
PrivateKey string
PublicKey string
Name string
ContractURL string
}
// NewFirebase creates a new instance of the Firebase structure
func NewFirebase(project string) (*Firebase, error) {
var f Firebase
ctx := context.Background()
conf := &firebase.Config{ProjectID: project}
app, err := firebase.NewApp(ctx, conf)
client, err := app.Firestore(ctx)
if err != nil {
log.Fatalln(err)
}
f.client = client
f.mutex = &sync.Mutex{}
err = f.refresh()
if err != nil {
return nil, err
}
return &f, nil
}
func (f *Firebase) setCreator(creator *Creator) error {
ctx := context.Background()
c := Fireitem{
Domain: creator.domain,
PrivateKey: creator.privateKey,
PublicKey: creator.publicKey,
Name: creator.name,
ContractURL: creator.contractURL,
}
a, err := f.client.Collection(creatorsTableName).Doc(creator.domain).Set(ctx, c)
fmt.Println(a)
return err
}
// GetCreator gets creator for domain from internal map, updating the internal
// map if the creator is not in the map.
func (f *Firebase) GetCreator(domain string) (*Creator, error) {
c, err := f.common.getCreator(domain)
if err != nil {
return nil, err
}
if c == nil {
err = f.refresh()
if err != nil {
return nil, err
}
c, err = f.common.getCreator(domain)
}
return c, err
}
func (f *Firebase) refresh() error {
// Fetch the creators
cs, err := f.fetchCreators()
if err != nil {
return err
}
// In a single atomic operation update the reference to the creators.
f.mutex.Lock()
f.creators = cs
f.mutex.Unlock()
return nil
}
func (f *Firebase) fetchCreators() (map[string]*Creator, error) {
ctx := context.Background()
cs := make(map[string]*Creator)
iter := f.client.Collection(creatorsTableName).Documents(ctx)
for {
doc, err := iter.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, err
}
var item Fireitem
err = doc.DataTo(&item)
if err != nil {
return nil, err
}
cs[item.Domain] = newCreator(
item.Domain,
item.PrivateKey,
item.PublicKey,
item.Name,
item.ContractURL)
}
return cs, nil
}