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mongo_socket.go
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/
mongo_socket.go
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// mgo - MongoDB driver for Go
//
// Copyright (c) 2010-2012 - Gustavo Niemeyer <gustavo@niemeyer.net>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package dvara
import (
"fmt"
"net"
"gopkg.in/mgo.v2-unstable/bson"
)
type replyFunc func(err error, reply *replyOp, docNum int, docData []byte)
type mongoSocket struct {
conn net.Conn
addr string // For debugging only.
}
type queryOp struct {
collection string
query interface{}
skip int32
limit int32
selector interface{}
flags uint32
replyFunc replyFunc
}
type replyOp struct {
flags uint32
cursorId int64
firstDoc int32
replyDocs int32
}
func (socket *mongoSocket) kill(err error, abend bool) {
fmt.Printf("WARN: Killing socket: %s, with error: %s, and abend:%s \n", socket, err, abend)
socket.conn.Close()
}
func (socket *mongoSocket) Query(op *queryOp) (err error) {
buf := make([]byte, 0, 256)
start := 0
buf = addHeader(buf, 2004)
buf = addInt32(buf, int32(op.flags))
buf = addCString(buf, op.collection)
buf = addInt32(buf, op.skip)
buf = addInt32(buf, op.limit)
buf, err = addBSON(buf, op.query)
if err != nil {
return err
}
replyFunc := op.replyFunc
setInt32(buf, start, int32(len(buf)-start))
socket.conn.Write(buf)
p := make([]byte, 36) // 16 from header + 20 from OP_REPLY fixed fields
fill(socket.conn, p)
reply := replyOp{
flags: uint32(getInt32(p, 16)),
cursorId: getInt64(p, 20),
firstDoc: getInt32(p, 28),
replyDocs: getInt32(p, 32),
}
if replyFunc != nil && reply.replyDocs == 0 {
replyFunc(nil, &reply, -1, nil)
} else {
s := make([]byte, 4)
for i := 0; i != int(reply.replyDocs); i++ {
err = fill(socket.conn, s)
if err != nil {
if replyFunc != nil {
replyFunc(err, nil, -1, nil)
}
socket.kill(err, true)
return
}
b := make([]byte, int(getInt32(s, 0)))
// copy(b, s) in an efficient way.
b[0] = s[0]
b[1] = s[1]
b[2] = s[2]
b[3] = s[3]
err = fill(socket.conn, b[4:])
if err != nil {
if replyFunc != nil {
replyFunc(err, nil, -1, nil)
}
socket.kill(err, true)
return
}
m := bson.M{}
if err := bson.Unmarshal(b, m); err == nil {
fmt.Printf("Socket %p to %s: received document: %#v\n", socket, socket.addr, m)
}
if replyFunc != nil {
replyFunc(nil, &reply, i, b)
}
// XXX Do bound checking against totalLen.
}
}
return err
}
func fill(r net.Conn, b []byte) error {
l := len(b)
n, err := r.Read(b)
for n != l && err == nil {
var ni int
ni, err = r.Read(b[n:])
n += ni
}
return err
}