0%

区块链链码编写

👴的srtp项目终于💧过去了(虽然👴以及💧过去快一个🈷了,但👴是懒🐕,所以👴记起来后,👴就顺便写写),👴使用三天速成区块链,成功写了写区块链2.0的链码,👴也懒得写咋写的了,懂得都懂,不懂得看一眼也懂🌶,所以👴就只贴一波代码🌶

以下就是怎么用go写链码🌶,最简单得那种,毕竟👴就混个项目,能跑就彳亍,

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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
package main

import (
"fmt"
"log"
"strconv"
"time"
"crypto/md5"
"encoding/hex"
"encoding/json"
"github.com/hyperledger/fabric-contract-api-go/contractapi"
)

// DonateContract Chaincode implementation
type DonateContract struct {
contractapi.Contract
}

type Donator struct {
ID string `json:"ID"`
User string `json:"User"`
Password string `json:"Password"`
Account int `json:"Account"`
}


type QueryHistoryResult struct {
TxId string `json:"tx_id"`
Value string `json:"value"`
IsDel string `json:"is_del"`
OnChainTime string `json:"on_chain_time"`
}

//init
func (s *DonateContract) InitLedger(ctx contractapi.TransactionContextInterface) error {
donators := []Donator{
{ID: "8c8b6928", User: "mfwc",Password: "password1", Account: 0},
{ID: "bdb26a7e", User: "zhjy",Password: "password2", Account: 0},
{ID: "c1859b89", User: "jbzz",Password: "password3", Account: 0},
}

for _, donator := range donators {
donatorJSON, err := json.Marshal(donator)
if err != nil {
return err
}

err = ctx.GetStub().PutState(donator.ID, donatorJSON)
if err != nil {
return fmt.Errorf("failed to put to world state. %v", err)
}
}

return nil
}
//new
func (s *DonateContract) CreateDonator(ctx contractapi.TransactionContextInterface, id string, user string, password string, account int) error {
exists, err := s.DonatorExists(ctx, id)
if err != nil {
return err
}
if exists {
return fmt.Errorf("the donator %s already exists", id)
}

donator := Donator{
ID: id,
User: user,
Password: password,
Account: account,
}
donatorJSON, err := json.Marshal(donator)
if err != nil {
return err
}

return ctx.GetStub().PutState(id, donatorJSON)
}

//read_message
func (s *DonateContract) ReadDonator(ctx contractapi.TransactionContextInterface, id string) (*Donator, error) {
donatorJSON, err := ctx.GetStub().GetState(id)
if err != nil {
return nil, fmt.Errorf("failed to read from world state: %v", err)
}
if donatorJSON == nil {
return nil, fmt.Errorf("the donator %s does not exist", id)
}

var donator Donator
err = json.Unmarshal(donatorJSON, &donator)
if err != nil {
return nil, err
}

return &donator, nil
}
//update
func (s *DonateContract) UpdateDonator(ctx contractapi.TransactionContextInterface, id string, user string, password string, account int) error {
exists, err := s.DonatorExists(ctx, id)
if err != nil {
return err
}
if !exists {
return fmt.Errorf("the donator %s does not exist", id)
}

// overwriting original donator with new donator
donator := Donator{
ID: id,
User: user,
Password: password,
Account: account,
}
donatorJSON, err := json.Marshal(donator)
if err != nil {
return err
}

return ctx.GetStub().PutState(id, donatorJSON)
}
//delete
func (s *DonateContract) DeleteDonator(ctx contractapi.TransactionContextInterface, id string) error {
exists, err := s.DonatorExists(ctx, id)
if err != nil {
return err
}
if !exists {
return fmt.Errorf("the donator %s does not exist", id)
}

return ctx.GetStub().DelState(id)
}
//getall
func (s *DonateContract) GetAllDonators(ctx contractapi.TransactionContextInterface) ([]*Donator, error) {
// range query with empty string for startKey and endKey does an
// open-ended query of all donators in the chaincode namespace.
resultsIterator, err := ctx.GetStub().GetStateByRange("", "")
if err != nil {
return nil, err
}
defer resultsIterator.Close()

var donators []*Donator
for resultsIterator.HasNext() {
queryResponse, err := resultsIterator.Next()
if err != nil {
return nil, err
}

var donator Donator
err = json.Unmarshal(queryResponse.Value, &donator)
if err != nil {
return nil, err
}
donators = append(donators, &donator)
}

return donators, nil
}
//search
func (s *DonateContract) DonatorExists(ctx contractapi.TransactionContextInterface, id string) (bool, error) {
donatorJSON, err := ctx.GetStub().GetState(id)
if err != nil {
return false, fmt.Errorf("failed to read from world state: %v", err)
}

return donatorJSON != nil, nil
}
//donate
func (s *DonateContract) Donate(ctx contractapi.TransactionContextInterface, donoid string, doneid string, money int) error {
donor, err := s.ReadDonator(ctx, donoid)
if err != nil {
return err
}
donee, err := s.ReadDonator(ctx, doneid)
if err != nil {
return err
}
s.UpdateDonator(ctx,donor.ID,donor.User,donor.Password,donor.Account-money)
s.UpdateDonator(ctx,donee.ID,donee.User,donee.Password,donee.Account+money)
return nil
}
//signin
func (s *DonateContract) signin(ctx contractapi.TransactionContextInterface, id string, user string, password string) error {
//id,user,password
s.CreateDonator(ctx,id,user,MD5(password),0)
return nil
}

//md5
func MD5(text string) string {
ctx := md5.New()
ctx.Write([]byte(text))
return hex.EncodeToString(ctx.Sum(nil))
}

//check pass
func (s *DonateContract) Check(ctx contractapi.TransactionContextInterface, id string, password string) (bool, error) {
user, err := s.ReadDonator(ctx, id)
if err != nil {
return false,err
}
if MD5(password)==user.Password {
return true,nil
} else{
return false,nil
}
}

//charge
func (s *DonateContract) Charge(ctx contractapi.TransactionContextInterface, donoid string, money int) error {
donor, err := s.ReadDonator(ctx, donoid)
if err != nil {
return err
}
s.UpdateDonator(ctx,donor.ID,donor.User,donor.Password,donor.Account+money)
return nil
}

//history

func (s *DonateContract) GetHistory(ctx contractapi.TransactionContextInterface, id string) ([]QueryHistoryResult, error) {
resultsIterator, err := ctx.GetStub().GetHistoryForKey(id)
if err != nil {
return nil, err
}
defer resultsIterator.Close()
//results := []QueryResult{}
//results := make([]QueryResult, 0)
results := make([]QueryHistoryResult, 0)
for resultsIterator.HasNext() {
if queryResponse, err := resultsIterator.Next();err==nil{
res := QueryHistoryResult{}
res.TxId=queryResponse.TxId
res.Value=string(queryResponse.Value)
res.IsDel=strconv.FormatBool(queryResponse.IsDelete)
res.OnChainTime=time.Unix(queryResponse.Timestamp.Seconds,0).Format("2006-01-02 15:04:05")
results= append(results, res)
}
if err!=nil {
return nil,err
}
}
return results, nil
}


//main
func main() {
donateChaincode, err := contractapi.NewChaincode(&DonateContract{})
if err != nil {
log.Panicf("Error creating donate chaincode: %v", err)
}
if err := donateChaincode.Start(); err != nil {
log.Panicf("Error starting donate chaincode: %v", err)
}
}
好饿啊,早知道不学安全了