Don Newton | 379ae25 | 2019-04-01 12:17:06 -0400 | [diff] [blame^] | 1 | // Copyright (C) MongoDB, Inc. 2017-present. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 4 | // not use this file except in compliance with the License. You may obtain |
| 5 | // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | |
| 7 | package command |
| 8 | |
| 9 | import ( |
| 10 | "context" |
| 11 | |
| 12 | "github.com/mongodb/mongo-go-driver/bson" |
| 13 | "github.com/mongodb/mongo-go-driver/x/bsonx" |
| 14 | "github.com/mongodb/mongo-go-driver/x/mongo/driver/session" |
| 15 | "github.com/mongodb/mongo-go-driver/x/network/description" |
| 16 | "github.com/mongodb/mongo-go-driver/x/network/result" |
| 17 | "github.com/mongodb/mongo-go-driver/x/network/wiremessage" |
| 18 | ) |
| 19 | |
| 20 | // must be sent to admin db |
| 21 | // { endSessions: [ {id: uuid}, ... ], $clusterTime: ... } |
| 22 | // only send $clusterTime when gossiping the cluster time |
| 23 | // send 10k sessions at a time |
| 24 | |
| 25 | // EndSessions represents an endSessions command. |
| 26 | type EndSessions struct { |
| 27 | Clock *session.ClusterClock |
| 28 | SessionIDs []bsonx.Doc |
| 29 | |
| 30 | results []result.EndSessions |
| 31 | errors []error |
| 32 | } |
| 33 | |
| 34 | // BatchSize is the max number of sessions to be included in 1 endSessions command. |
| 35 | const BatchSize = 10000 |
| 36 | |
| 37 | func (es *EndSessions) split() [][]bsonx.Doc { |
| 38 | batches := [][]bsonx.Doc{} |
| 39 | docIndex := 0 |
| 40 | totalNumDocs := len(es.SessionIDs) |
| 41 | |
| 42 | createBatches: |
| 43 | for { |
| 44 | batch := []bsonx.Doc{} |
| 45 | |
| 46 | for i := 0; i < BatchSize; i++ { |
| 47 | if docIndex == totalNumDocs { |
| 48 | break createBatches |
| 49 | } |
| 50 | |
| 51 | batch = append(batch, es.SessionIDs[docIndex]) |
| 52 | docIndex++ |
| 53 | } |
| 54 | |
| 55 | batches = append(batches, batch) |
| 56 | } |
| 57 | |
| 58 | return batches |
| 59 | } |
| 60 | |
| 61 | func (es *EndSessions) encodeBatch(batch []bsonx.Doc, desc description.SelectedServer) *Write { |
| 62 | vals := make(bsonx.Arr, 0, len(batch)) |
| 63 | for _, doc := range batch { |
| 64 | vals = append(vals, bsonx.Document(doc)) |
| 65 | } |
| 66 | |
| 67 | cmd := bsonx.Doc{{"endSessions", bsonx.Array(vals)}} |
| 68 | |
| 69 | return &Write{ |
| 70 | Clock: es.Clock, |
| 71 | DB: "admin", |
| 72 | Command: cmd, |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | // Encode will encode this command into a series of wire messages for the given server description. |
| 77 | func (es *EndSessions) Encode(desc description.SelectedServer) ([]wiremessage.WireMessage, error) { |
| 78 | cmds := es.encode(desc) |
| 79 | wms := make([]wiremessage.WireMessage, len(cmds)) |
| 80 | |
| 81 | for _, cmd := range cmds { |
| 82 | wm, err := cmd.Encode(desc) |
| 83 | if err != nil { |
| 84 | return nil, err |
| 85 | } |
| 86 | |
| 87 | wms = append(wms, wm) |
| 88 | } |
| 89 | |
| 90 | return wms, nil |
| 91 | } |
| 92 | |
| 93 | func (es *EndSessions) encode(desc description.SelectedServer) []*Write { |
| 94 | out := []*Write{} |
| 95 | batches := es.split() |
| 96 | |
| 97 | for _, batch := range batches { |
| 98 | out = append(out, es.encodeBatch(batch, desc)) |
| 99 | } |
| 100 | |
| 101 | return out |
| 102 | } |
| 103 | |
| 104 | // Decode will decode the wire message using the provided server description. Errors during decoding |
| 105 | // are deferred until either the Result or Err methods are called. |
| 106 | func (es *EndSessions) Decode(desc description.SelectedServer, wm wiremessage.WireMessage) *EndSessions { |
| 107 | rdr, err := (&Write{}).Decode(desc, wm).Result() |
| 108 | if err != nil { |
| 109 | es.errors = append(es.errors, err) |
| 110 | return es |
| 111 | } |
| 112 | |
| 113 | return es.decode(desc, rdr) |
| 114 | } |
| 115 | |
| 116 | func (es *EndSessions) decode(desc description.SelectedServer, rdr bson.Raw) *EndSessions { |
| 117 | var res result.EndSessions |
| 118 | es.errors = append(es.errors, bson.Unmarshal(rdr, &res)) |
| 119 | es.results = append(es.results, res) |
| 120 | return es |
| 121 | } |
| 122 | |
| 123 | // Result returns the results of the decoded wire messages. |
| 124 | func (es *EndSessions) Result() ([]result.EndSessions, []error) { |
| 125 | return es.results, es.errors |
| 126 | } |
| 127 | |
| 128 | // RoundTrip handles the execution of this command using the provided wiremessage.ReadWriter |
| 129 | func (es *EndSessions) RoundTrip(ctx context.Context, desc description.SelectedServer, rw wiremessage.ReadWriter) ([]result.EndSessions, []error) { |
| 130 | cmds := es.encode(desc) |
| 131 | |
| 132 | for _, cmd := range cmds { |
| 133 | rdr, _ := cmd.RoundTrip(ctx, desc, rw) // ignore any errors returned by the command |
| 134 | es.decode(desc, rdr) |
| 135 | } |
| 136 | |
| 137 | return es.Result() |
| 138 | } |