/
list_collections.go
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/
list_collections.go
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// 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/core/description"
"github.com/mongodb/mongo-go-driver/core/session"
"github.com/mongodb/mongo-go-driver/core/wiremessage"
"github.com/mongodb/mongo-go-driver/mongo/readpref"
"github.com/mongodb/mongo-go-driver/x/bsonx"
)
// 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 Cursor
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, cb CursorBuilder, wm wiremessage.WireMessage) *ListCollections {
rdr, err := (&Read{}).Decode(desc, wm).Result()
if err != nil {
lc.err = err
return lc
}
return lc.decode(desc, cb, rdr)
}
func (lc *ListCollections) decode(desc description.SelectedServer, cb CursorBuilder, rdr bson.Raw) *ListCollections {
labels, err := getErrorLabels(&rdr)
lc.err = err
res, err := cb.BuildCursor(rdr, lc.Session, lc.Clock, lc.CursorOpts...)
lc.result = res
if err != nil {
lc.err = Error{Message: err.Error(), Labels: labels}
}
return lc
}
// Result returns the result of a decoded wire message and server description.
func (lc *ListCollections) Result() (Cursor, 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, cb CursorBuilder, rw wiremessage.ReadWriter) (Cursor, 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, cb, rdr).Result()
}