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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// 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 rpc
import (
"fmt"
"math"
"math/big"
"reflect"
"strings"
"sync"
"gopkg.in/fatih/set.v0"
)
// API describes the set of methods offered over the RPC interface
type API struct {
Namespace string // namespace under which the rpc methods of Service are exposed
Version string // api version for DApp's
Service interface{} // receiver instance which holds the methods
Public bool // indication if the methods must be considered safe for public use
}
// callback is a method callback which was registered in the server
type callback struct {
rcvr reflect.Value // receiver of method
method reflect.Method // callback
argTypes []reflect.Type // input argument types
hasCtx bool // method's first argument is a context (not included in argTypes)
errPos int // err return idx, of -1 when method cannot return error
isSubscribe bool // indication if the callback is a subscription
}
// service represents a registered object
type service struct {
name string // name for service
rcvr reflect.Value // receiver of methods for the service
typ reflect.Type // receiver type
callbacks callbacks // registered handlers
subscriptions subscriptions // available subscriptions/notifications
}
// serverRequest is an incoming request
type serverRequest struct {
id interface{}
svcname string
rcvr reflect.Value
callb *callback
args []reflect.Value
isUnsubscribe bool
err Error
}
type serviceRegistry map[string]*service // collection of services
type callbacks map[string]*callback // collection of RPC callbacks
type subscriptions map[string]*callback // collection of subscription callbacks
type subscriptionRegistry map[string]*callback // collection of subscription callbacks
// Server represents a RPC server
type Server struct {
services serviceRegistry
muSubcriptions sync.Mutex // protects subscriptions
subscriptions subscriptionRegistry
run int32
codecsMu sync.Mutex
codecs *set.Set
}
// rpcRequest represents a raw incoming RPC request
type rpcRequest struct {
service string
method string
id interface{}
isPubSub bool
params interface{}
err Error // invalid batch element
}
// Error wraps RPC errors, which contain an error code in addition to the message.
type Error interface {
Error() string // returns the message
ErrorCode() int // returns the code
}
// ServerCodec implements reading, parsing and writing RPC messages for the server side of
// a RPC session. Implementations must be go-routine safe since the codec can be called in
// multiple go-routines concurrently.
type ServerCodec interface {
// Read next request
ReadRequestHeaders() ([]rpcRequest, bool, Error)
// Parse request argument to the given types
ParseRequestArguments([]reflect.Type, interface{}) ([]reflect.Value, Error)
// Assemble success response, expects response id and payload
CreateResponse(interface{}, interface{}) interface{}
// Assemble error response, expects response id and error
CreateErrorResponse(interface{}, Error) interface{}
// Assemble error response with extra information about the error through info
CreateErrorResponseWithInfo(id interface{}, err Error, info interface{}) interface{}
// Create notification response
CreateNotification(string, interface{}) interface{}
// Write msg to client.
Write(interface{}) error
// Close underlying data stream
Close()
// Closed when underlying connection is closed
Closed() <-chan interface{}
}
var (
pendingBlockNumber = big.NewInt(-2)
latestBlockNumber = big.NewInt(-1)
earliestBlockNumber = big.NewInt(0)
maxBlockNumber = big.NewInt(math.MaxInt64)
)
type BlockNumber int64
const (
PendingBlockNumber = BlockNumber(-2)
LatestBlockNumber = BlockNumber(-1)
)
// UnmarshalJSON parses the given JSON fragment into a BlockNumber. It supports:
// - "latest", "earliest" or "pending" as string arguments
// - the block number
// Returned errors:
// - an invalid block number error when the given argument isn't a known strings
// - an out of range error when the given block number is either too little or too large
func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
input := strings.TrimSpace(string(data))
if len(input) >= 2 && input[0] == '"' && input[len(input)-1] == '"' {
input = input[1 : len(input)-1]
}
if len(input) == 0 {
*bn = BlockNumber(latestBlockNumber.Int64())
return nil
}
in := new(big.Int)
_, ok := in.SetString(input, 0)
if !ok { // test if user supplied string tag
strBlockNumber := input
if strBlockNumber == "latest" {
*bn = BlockNumber(latestBlockNumber.Int64())
return nil
}
if strBlockNumber == "earliest" {
*bn = BlockNumber(earliestBlockNumber.Int64())
return nil
}
if strBlockNumber == "pending" {
*bn = BlockNumber(pendingBlockNumber.Int64())
return nil
}
return fmt.Errorf(`invalid blocknumber %s`, data)
}
if in.Cmp(earliestBlockNumber) >= 0 && in.Cmp(maxBlockNumber) <= 0 {
*bn = BlockNumber(in.Int64())
return nil
}
return fmt.Errorf("blocknumber not in range [%d, %d]", earliestBlockNumber, maxBlockNumber)
}
func (bn BlockNumber) Int64() int64 {
return (int64)(bn)
}
|
