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// Copyright 2017 Google LLC
//
// 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 firestore
import (
"context"
"math/rand"
"os"
"sync"
"time"
)
// A CollectionRef is a reference to Firestore collection.
type CollectionRef struct {
c *Client
// The full resource path of the collection's parent. Typically Parent.Path,
// or c.path if Parent is nil. May be different if this CollectionRef was
// created from a stored reference to a different project/DB.
//
// For example, "projects/P/databases/D/documents/coll-1/doc-1".
parentPath string
// The shorter resource path of the collection. A collection "coll-2" in
// document "doc-1" in collection "coll-1" would be: "coll-1/doc-1/coll-2".
selfPath string
// Parent is the document of which this collection is a part. It is
// nil for top-level collections.
Parent *DocumentRef
// The full resource path of the collection: "projects/P/databases/D/documents..."
Path string
// ID is the collection identifier.
ID string
// Use the methods of Query on a CollectionRef to create and run queries.
Query
}
func newTopLevelCollRef(c *Client, dbPath, id string) *CollectionRef {
return &CollectionRef{
c: c,
ID: id,
parentPath: dbPath,
selfPath: id,
Path: dbPath + "/documents/" + id,
Query: Query{
c: c,
collectionID: id,
path: dbPath + "/documents/" + id,
parentPath: dbPath,
},
}
}
func newCollRefWithParent(c *Client, parent *DocumentRef, id string) *CollectionRef {
selfPath := parent.shortPath + "/" + id
return &CollectionRef{
c: c,
Parent: parent,
ID: id,
parentPath: parent.Path,
selfPath: selfPath,
Path: parent.Path + "/" + id,
Query: Query{
c: c,
collectionID: id,
path: parent.Path + "/" + id,
parentPath: parent.Path,
},
}
}
// Doc returns a DocumentRef that refers to the document in the collection with the
// given identifier.
func (c *CollectionRef) Doc(id string) *DocumentRef {
if c == nil {
return nil
}
return newDocRef(c, id)
}
// NewDoc returns a DocumentRef with a uniquely generated ID.
func (c *CollectionRef) NewDoc() *DocumentRef {
return c.Doc(uniqueID())
}
// Add generates a DocumentRef with a unique ID. It then creates the document
// with the given data, which can be a map[string]interface{}, a struct or a
// pointer to a struct.
//
// Add returns an error in the unlikely event that a document with the same ID
// already exists.
func (c *CollectionRef) Add(ctx context.Context, data interface{}) (*DocumentRef, *WriteResult, error) {
d := c.NewDoc()
wr, err := d.Create(ctx, data)
if err != nil {
return nil, nil, err
}
return d, wr, nil
}
// DocumentRefs returns references to all the documents in the collection, including
// missing documents. A missing document is a document that does not exist but has
// sub-documents.
func (c *CollectionRef) DocumentRefs(ctx context.Context) *DocumentRefIterator {
if err := checkTransaction(ctx); err != nil {
return &DocumentRefIterator{err: err}
}
return newDocumentRefIterator(ctx, c, nil)
}
const alphanum = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
var (
rngMu sync.Mutex
rng = rand.New(rand.NewSource(time.Now().UnixNano() ^ int64(os.Getpid())))
)
func uniqueID() string {
var b [20]byte
rngMu.Lock()
for i := 0; i < len(b); i++ {
b[i] = alphanum[rng.Intn(len(alphanum))]
}
rngMu.Unlock()
return string(b[:])
}