115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
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// Copyright 2017 Google Inc. All Rights Reserved.
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//
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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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package firestore
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import (
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"math/rand"
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"os"
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"sync"
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"time"
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"golang.org/x/net/context"
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)
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// A CollectionRef is a reference to Firestore collection.
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type CollectionRef struct {
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c *Client
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// Typically Parent.Path, or c.path if Parent is nil.
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// May be different if this CollectionRef was created from a stored reference
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// to a different project/DB.
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parentPath string
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// Parent is the document of which this collection is a part. It is
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// nil for top-level collections.
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Parent *DocumentRef
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// The full resource path of the collection: "projects/P/databases/D/documents..."
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Path string
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// ID is the collection identifier.
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ID string
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// Use the methods of Query on a CollectionRef to create and run queries.
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Query
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}
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func newTopLevelCollRef(c *Client, dbPath, id string) *CollectionRef {
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return &CollectionRef{
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c: c,
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ID: id,
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parentPath: dbPath,
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Path: dbPath + "/documents/" + id,
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Query: Query{c: c, collectionID: id, parentPath: dbPath},
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}
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}
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func newCollRefWithParent(c *Client, parent *DocumentRef, id string) *CollectionRef {
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return &CollectionRef{
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c: c,
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Parent: parent,
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ID: id,
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parentPath: parent.Path,
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Path: parent.Path + "/" + id,
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Query: Query{c: c, collectionID: id, parentPath: parent.Path},
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}
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}
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// Doc returns a DocumentRef that refers to the document in the collection with the
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// given identifier.
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func (c *CollectionRef) Doc(id string) *DocumentRef {
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if c == nil {
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return nil
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}
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return newDocRef(c, id)
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}
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// NewDoc returns a DocumentRef with a uniquely generated ID.
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func (c *CollectionRef) NewDoc() *DocumentRef {
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return c.Doc(uniqueID())
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}
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// Add generates a DocumentRef with a unique ID. It then creates the document
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// with the given data, which can be a map[string]interface{}, a struct or a
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// pointer to a struct.
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//
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// Add returns an error in the unlikely event that a document with the same ID
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// already exists.
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func (c *CollectionRef) Add(ctx context.Context, data interface{}) (*DocumentRef, *WriteResult, error) {
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d := c.NewDoc()
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wr, err := d.Create(ctx, data)
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if err != nil {
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return nil, nil, err
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}
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return d, wr, nil
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}
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const alphanum = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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var (
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rngMu sync.Mutex
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rng = rand.New(rand.NewSource(time.Now().UnixNano() ^ int64(os.Getpid())))
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)
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func uniqueID() string {
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var b [20]byte
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rngMu.Lock()
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for i := 0; i < len(b); i++ {
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b[i] = alphanum[rng.Intn(len(alphanum))]
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}
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rngMu.Unlock()
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return string(b[:])
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}
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