aboutsummaryrefslogtreecommitdiffstats
path: root/rpc/codec/json.go
blob: d811b20968f542691c5ca2f476afeeadcaeed00e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package codec

import (
    "encoding/json"
    "fmt"
    "net"
    "time"

    "github.com/ethereum/go-ethereum/rpc/shared"
)

const (
    READ_TIMEOUT      = 60 // in seconds
    MAX_REQUEST_SIZE  = 1024 * 1024
    MAX_RESPONSE_SIZE = 1024 * 1024
)

// Json serialization support
type JsonCodec struct {
    c net.Conn
    d *json.Decoder
}

// Create new JSON coder instance
func NewJsonCoder(conn net.Conn) ApiCoder {
    return &JsonCodec{
        c: conn,
        d: json.NewDecoder(conn),
    }
}

// Read incoming request and parse it to RPC request
func (self *JsonCodec) ReadRequest() (requests []*shared.Request, isBatch bool, err error) {
    deadline := time.Now().Add(READ_TIMEOUT * time.Second)
    if err := self.c.SetDeadline(deadline); err != nil {
        return nil, false, err
    }

    var incoming json.RawMessage
    err = self.d.Decode(&incoming)
    if err == nil {
        isBatch = incoming[0] == '['
        if isBatch {
            requests = make([]*shared.Request, 0)
            err = json.Unmarshal(incoming, &requests)
        } else {
            requests = make([]*shared.Request, 1)
            var singleRequest shared.Request
            if err = json.Unmarshal(incoming, &singleRequest); err == nil {
                requests[0] = &singleRequest
            }
        }
        return
    }

    self.c.Close()
    return nil, false, err
}

func (self *JsonCodec) ReadResponse() (interface{}, error) {
    bytesInBuffer := 0
    buf := make([]byte, MAX_RESPONSE_SIZE)

    deadline := time.Now().Add(READ_TIMEOUT * time.Second)
    if err := self.c.SetDeadline(deadline); err != nil {
        return nil, err
    }

    for {
        n, err := self.c.Read(buf[bytesInBuffer:])
        if err != nil {
            return nil, err
        }
        bytesInBuffer += n

        var failure shared.ErrorResponse
        if err = json.Unmarshal(buf[:bytesInBuffer], &failure); err == nil && failure.Error != nil {
            return failure, fmt.Errorf(failure.Error.Message)
        }

        var success shared.SuccessResponse
        if err = json.Unmarshal(buf[:bytesInBuffer], &success); err == nil {
            return success, nil
        }
    }

    self.c.Close()
    return nil, fmt.Errorf("Unable to read response")
}

// Decode data
func (self *JsonCodec) Decode(data []byte, msg interface{}) error {
    return json.Unmarshal(data, msg)
}

// Encode message
func (self *JsonCodec) Encode(msg interface{}) ([]byte, error) {
    return json.Marshal(msg)
}

// Parse JSON data from conn to obj
func (self *JsonCodec) WriteResponse(res interface{}) error {
    data, err := json.Marshal(res)
    if err != nil {
        self.c.Close()
        return err
    }

    bytesWritten := 0

    for bytesWritten < len(data) {
        n, err := self.c.Write(data[bytesWritten:])
        if err != nil {
            self.c.Close()
            return err
        }
        bytesWritten += n
    }

    return nil
}

// Close decoder and encoder
func (self *JsonCodec) Close() {
    self.c.Close()
}