| // Copyright (C) MongoDB, Inc. 2017-present. |
| // |
| // 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 |
| |
| package command |
| |
| import ( |
| "context" |
| |
| "github.com/mongodb/mongo-go-driver/bson" |
| "github.com/mongodb/mongo-go-driver/mongo/readpref" |
| "github.com/mongodb/mongo-go-driver/x/bsonx" |
| "github.com/mongodb/mongo-go-driver/x/mongo/driver/session" |
| "github.com/mongodb/mongo-go-driver/x/network/description" |
| "github.com/mongodb/mongo-go-driver/x/network/wiremessage" |
| ) |
| |
| // ListCollections represents the listCollections command. |
| // |
| // The listCollections command lists the collections in a database. |
| type ListCollections struct { |
| Clock *session.ClusterClock |
| DB string |
| Filter bsonx.Doc |
| CursorOpts []bsonx.Elem |
| Opts []bsonx.Elem |
| ReadPref *readpref.ReadPref |
| Session *session.Client |
| |
| result bson.Raw |
| err error |
| } |
| |
| // Encode will encode this command into a wire message for the given server description. |
| func (lc *ListCollections) Encode(desc description.SelectedServer) (wiremessage.WireMessage, error) { |
| encoded, err := lc.encode(desc) |
| if err != nil { |
| return nil, err |
| } |
| return encoded.Encode(desc) |
| } |
| |
| func (lc *ListCollections) encode(desc description.SelectedServer) (*Read, error) { |
| cmd := bsonx.Doc{{"listCollections", bsonx.Int32(1)}} |
| |
| if lc.Filter != nil { |
| cmd = append(cmd, bsonx.Elem{"filter", bsonx.Document(lc.Filter)}) |
| } |
| cmd = append(cmd, lc.Opts...) |
| |
| return &Read{ |
| Clock: lc.Clock, |
| DB: lc.DB, |
| Command: cmd, |
| ReadPref: lc.ReadPref, |
| Session: lc.Session, |
| }, nil |
| } |
| |
| // Decode will decode the wire message using the provided server description. Errors during decolcng |
| // are deferred until either the Result or Err methods are called. |
| func (lc *ListCollections) Decode(desc description.SelectedServer, wm wiremessage.WireMessage) *ListCollections { |
| rdr, err := (&Read{}).Decode(desc, wm).Result() |
| if err != nil { |
| lc.err = err |
| return lc |
| } |
| return lc.decode(desc, rdr) |
| } |
| |
| func (lc *ListCollections) decode(desc description.SelectedServer, rdr bson.Raw) *ListCollections { |
| lc.result = rdr |
| return lc |
| } |
| |
| // Result returns the result of a decoded wire message and server description. |
| func (lc *ListCollections) Result() (bson.Raw, error) { |
| if lc.err != nil { |
| return nil, lc.err |
| } |
| return lc.result, nil |
| } |
| |
| // Err returns the error set on this command. |
| func (lc *ListCollections) Err() error { return lc.err } |
| |
| // RoundTrip handles the execution of this command using the provided wiremessage.ReadWriter. |
| func (lc *ListCollections) RoundTrip(ctx context.Context, desc description.SelectedServer, rw wiremessage.ReadWriter) (bson.Raw, error) { |
| cmd, err := lc.encode(desc) |
| if err != nil { |
| return nil, err |
| } |
| |
| rdr, err := cmd.RoundTrip(ctx, desc, rw) |
| if err != nil { |
| return nil, err |
| } |
| |
| return lc.decode(desc, rdr).Result() |
| } |