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// Copyright (C) MongoDB, Inc. 2014-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 mongoreplay
import (
"encoding/json"
"fmt"
"io"
"time"
mgo "github.com/10gen/llmgo"
"github.com/10gen/llmgo/bson"
)
// CommandReplyOp is a struct for parsing OP_COMMANDREPLY as defined here:
// https://github.com/mongodb/mongo/blob/master/src/mongo/rpc/command_reply.h.
// Although this file parses the wire protocol message into a more useable
// struct, it does not currently provide functionality to execute the operation,
// as it is not implemented fully in llmgo.
type CommandReplyOp struct {
Header MsgHeader
mgo.CommandReplyOp
Docs []bson.Raw
Latency time.Duration
cursorID *int64
}
// OpCode returns the OpCode for a CommandReplyOp.
func (op *CommandReplyOp) OpCode() OpCode {
return OpCodeCommandReply
}
// Meta returns metadata about the operation, useful for analysis of traffic.
// Currently only returns 'unknown' as it is not fully parsed and analyzed.
func (op *CommandReplyOp) Meta() OpMetadata {
return OpMetadata{"op_commandreply",
"",
"",
map[string]interface{}{
"metadata": op.Metadata,
"command_reply": op.CommandReply,
"output_docs": op.OutputDocs,
},
}
}
func (op *CommandReplyOp) String() string {
commandReplyString, metadataString, outputDocsString, err := op.getOpBodyString()
if err != nil {
return fmt.Sprintf("%v", err)
}
return fmt.Sprintf("CommandReply %v %v %v", commandReplyString, metadataString, outputDocsString)
}
// Abbreviated returns a serialization of the OpCommand, abbreviated so it
// doesn't exceed the given number of characters.
func (op *CommandReplyOp) Abbreviated(chars int) string {
commandReplyString, metadataString, outputDocsString, err := op.getOpBodyString()
if err != nil {
return fmt.Sprintf("%v", err)
}
return fmt.Sprintf("CommandReply replay:%v metadata:%v outputdocs:%v",
Abbreviate(commandReplyString, chars), Abbreviate(metadataString, chars),
Abbreviate(outputDocsString, chars))
}
// getCursorID implements the Replyable interface method of the same name. It
// returns the cursorID associated with this CommandReplyOp. It returns an error
// if there is an issue unmarshalling the underlying bson. getCursorID also
// caches in the CommandReplyOp struct so that multiple calls to this function
// do not incur the cost of unmarshalling the bson.
func (op *CommandReplyOp) getCursorID() (int64, error) {
if op.cursorID != nil {
return *op.cursorID, nil
}
replyArgs := op.CommandReply.(*bson.Raw)
id, err := getCursorID(replyArgs)
if err != nil {
return 0, err
}
op.cursorID = &id
return *op.cursorID, nil
}
func (op *CommandReplyOp) getOpBodyString() (string, string, string, error) {
commandReplyDoc, err := ConvertBSONValueToJSON(op.CommandReply)
if err != nil {
return "", "", "", fmt.Errorf("ConvertBSONValueToJSON err: %#v - %v", op, err)
}
commandReplyAsJSON, err := json.Marshal(commandReplyDoc)
if err != nil {
return "", "", "", fmt.Errorf("json marshal err: %#v - %v", op, err)
}
metadataDocs, err := ConvertBSONValueToJSON(op.Metadata)
if err != nil {
return "", "", "", fmt.Errorf("ConvertBSONValueToJSON err: %#v - %v", op, err)
}
metadataAsJSON, err := json.Marshal(metadataDocs)
if err != nil {
return "", "", "", fmt.Errorf("json marshal err: %#v - %v", op, err)
}
var outputDocsString string
if len(op.OutputDocs) != 0 {
outputDocs, err := ConvertBSONValueToJSON(op.OutputDocs)
if err != nil {
return "", "", "", fmt.Errorf("ConvertBSONValueToJSON err: %#v - %v", op, err)
}
outputDocsAsJSON, err := json.Marshal(outputDocs)
if err != nil {
return "", "", "", fmt.Errorf("json marshal err: %#v - %v", op, err)
}
outputDocsString = string(outputDocsAsJSON)
}
return string(commandReplyAsJSON), string(metadataAsJSON), outputDocsString, nil
}
// FromReader extracts data from a serialized CommandReplyOp into its
// concrete structure.
func (op *CommandReplyOp) FromReader(r io.Reader) error {
commandReplyAsSlice, err := ReadDocument(r)
if err != nil {
return err
}
op.CommandReply = &bson.Raw{}
err = bson.Unmarshal(commandReplyAsSlice, op.CommandReply)
if err != nil {
return err
}
metadataAsSlice, err := ReadDocument(r)
if err != nil {
return err
}
op.Metadata = &bson.Raw{}
err = bson.Unmarshal(metadataAsSlice, op.Metadata)
if err != nil {
return err
}
op.OutputDocs = make([]interface{}, 0)
for {
docAsSlice, err := ReadDocument(r)
if err != nil {
if err != io.EOF {
// Broken BSON in reply data. TODO log something here?
return err
}
break
}
if len(docAsSlice) == 0 {
break
}
doc := &bson.Raw{}
err = bson.Unmarshal(docAsSlice, doc)
if err != nil {
return err
}
op.OutputDocs = append(op.OutputDocs, doc)
}
return nil
}
// Execute logs a warning and returns nil because OP_COMMANDREPLY cannot yet be
// handled fully by mongoreplay.
func (op *CommandReplyOp) Execute(socket *mgo.MongoSocket) (Replyable, error) {
userInfoLogger.Logv(Always, "Skipping unimplemented op: OP_COMMANDREPLY")
return nil, nil
}
func (op *CommandReplyOp) getNumReturned() int {
return len(op.Docs)
}
func (op *CommandReplyOp) getLatencyMicros() int64 {
return int64(op.Latency / (time.Microsecond))
}
func (op *CommandReplyOp) getErrors() []error {
if len(op.Docs) == 0 {
return nil
}
firstDoc := bson.D{}
err := op.Docs[0].Unmarshal(&firstDoc)
if err != nil {
panic("failed to unmarshal Raw into bson.D")
}
return extractErrorsFromDoc(&firstDoc)
}
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