-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
main.go
332 lines (261 loc) · 9.04 KB
/
main.go
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
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
package main
import (
"context"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"sync"
config "github.com/ipfs/go-ipfs-config"
files "github.com/ipfs/go-ipfs-files"
libp2p "github.com/ipfs/go-ipfs/core/node/libp2p"
icore "github.com/ipfs/interface-go-ipfs-core"
icorepath "github.com/ipfs/interface-go-ipfs-core/path"
peerstore "github.com/libp2p/go-libp2p-peerstore"
ma "github.com/multiformats/go-multiaddr"
"github.com/ipfs/go-ipfs/core"
"github.com/ipfs/go-ipfs/core/coreapi"
"github.com/ipfs/go-ipfs/plugin/loader" // This package is needed so that all the preloaded plugins are loaded automatically
"github.com/ipfs/go-ipfs/repo/fsrepo"
"github.com/libp2p/go-libp2p-core/peer"
)
/// ------ Setting up the IPFS Repo
func setupPlugins(externalPluginsPath string) error {
// Load any external plugins if available on externalPluginsPath
plugins, err := loader.NewPluginLoader(filepath.Join(externalPluginsPath, "plugins"))
if err != nil {
return fmt.Errorf("error loading plugins: %s", err)
}
// Load preloaded and external plugins
if err := plugins.Initialize(); err != nil {
return fmt.Errorf("error initializing plugins: %s", err)
}
if err := plugins.Inject(); err != nil {
return fmt.Errorf("error initializing plugins: %s", err)
}
return nil
}
func createTempRepo(ctx context.Context) (string, error) {
repoPath, err := ioutil.TempDir("", "ipfs-shell")
if err != nil {
return "", fmt.Errorf("failed to get temp dir: %s", err)
}
// Create a config with default options and a 2048 bit key
cfg, err := config.Init(ioutil.Discard, 2048)
if err != nil {
return "", err
}
// Create the repo with the config
err = fsrepo.Init(repoPath, cfg)
if err != nil {
return "", fmt.Errorf("failed to init ephemeral node: %s", err)
}
return repoPath, nil
}
/// ------ Spawning the node
// Creates an IPFS node and returns its coreAPI
func createNode(ctx context.Context, repoPath string) (icore.CoreAPI, error) {
// Open the repo
repo, err := fsrepo.Open(repoPath)
if err != nil {
return nil, err
}
// Construct the node
nodeOptions := &core.BuildCfg{
Online: true,
Routing: libp2p.DHTOption, // This option sets the node to be a full DHT node (both fetching and storing DHT Records)
// Routing: libp2p.DHTClientOption, // This option sets the node to be a client DHT node (only fetching records)
Repo: repo,
}
node, err := core.NewNode(ctx, nodeOptions)
if err != nil {
return nil, err
}
// Attach the Core API to the constructed node
return coreapi.NewCoreAPI(node)
}
// Spawns a node on the default repo location, if the repo exists
func spawnDefault(ctx context.Context) (icore.CoreAPI, error) {
defaultPath, err := config.PathRoot()
if err != nil {
// shouldn't be possible
return nil, err
}
if err := setupPlugins(defaultPath); err != nil {
return nil, err
}
return createNode(ctx, defaultPath)
}
// Spawns a node to be used just for this run (i.e. creates a tmp repo)
func spawnEphemeral(ctx context.Context) (icore.CoreAPI, error) {
if err := setupPlugins(""); err != nil {
return nil, err
}
// Create a Temporary Repo
repoPath, err := createTempRepo(ctx)
if err != nil {
return nil, fmt.Errorf("failed to create temp repo: %s", err)
}
// Spawning an ephemeral IPFS node
return createNode(ctx, repoPath)
}
//
func connectToPeers(ctx context.Context, ipfs icore.CoreAPI, peers []string) error {
var wg sync.WaitGroup
peerInfos := make(map[peer.ID]*peerstore.PeerInfo, len(peers))
for _, addrStr := range peers {
addr, err := ma.NewMultiaddr(addrStr)
if err != nil {
return err
}
pii, err := peerstore.InfoFromP2pAddr(addr)
if err != nil {
return err
}
pi, ok := peerInfos[pii.ID]
if !ok {
pi = &peerstore.PeerInfo{ID: pii.ID}
peerInfos[pi.ID] = pi
}
pi.Addrs = append(pi.Addrs, pii.Addrs...)
}
wg.Add(len(peerInfos))
for _, peerInfo := range peerInfos {
go func(peerInfo *peerstore.PeerInfo) {
defer wg.Done()
err := ipfs.Swarm().Connect(ctx, *peerInfo)
if err != nil {
log.Printf("failed to connect to %s: %s", peerInfo.ID, err)
}
}(peerInfo)
}
wg.Wait()
return nil
}
func getUnixfsFile(path string) (files.File, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
st, err := file.Stat()
if err != nil {
return nil, err
}
f, err := files.NewReaderPathFile(path, file, st)
if err != nil {
return nil, err
}
return f, nil
}
func getUnixfsNode(path string) (files.Node, error) {
st, err := os.Stat(path)
if err != nil {
return nil, err
}
f, err := files.NewSerialFile(path, false, st)
if err != nil {
return nil, err
}
return f, nil
}
/// -------
func main() {
/// --- Part I: Getting a IPFS node running
fmt.Println("-- Getting an IPFS node running -- ")
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
/*
// Spawn a node using the default path (~/.ipfs), assuming that a repo exists there already
fmt.Println("Spawning node on default repo")
ipfs, err := spawnDefault(ctx)
if err != nil {
fmt.Println("No IPFS repo available on the default path")
}
*/
// Spawn a node using a temporary path, creating a temporary repo for the run
fmt.Println("Spawning node on a temporary repo")
ipfs, err := spawnEphemeral(ctx)
if err != nil {
panic(fmt.Errorf("failed to spawn ephemeral node: %s", err))
}
fmt.Println("IPFS node is running")
/// --- Part II: Adding a file and a directory to IPFS
fmt.Println("\n-- Adding and getting back files & directories --")
inputBasePath := "./example-folder/"
inputPathFile := inputBasePath + "ipfs.paper.draft3.pdf"
inputPathDirectory := inputBasePath + "test-dir"
someFile, err := getUnixfsNode(inputPathFile)
if err != nil {
panic(fmt.Errorf("Could not get File: %s", err))
}
cidFile, err := ipfs.Unixfs().Add(ctx, someFile)
if err != nil {
panic(fmt.Errorf("Could not add File: %s", err))
}
fmt.Printf("Added file to IPFS with CID %s\n", cidFile.String())
someDirectory, err := getUnixfsNode(inputPathDirectory)
if err != nil {
panic(fmt.Errorf("Could not get File: %s", err))
}
cidDirectory, err := ipfs.Unixfs().Add(ctx, someDirectory)
if err != nil {
panic(fmt.Errorf("Could not add Directory: %s", err))
}
fmt.Printf("Added directory to IPFS with CID %s\n", cidDirectory.String())
/// --- Part III: Getting the file and directory you added back
outputBasePath := "./example-folder/"
outputPathFile := outputBasePath + strings.Split(cidFile.String(), "/")[2]
outputPathDirectory := outputBasePath + strings.Split(cidDirectory.String(), "/")[2]
rootNodeFile, err := ipfs.Unixfs().Get(ctx, cidFile)
if err != nil {
panic(fmt.Errorf("Could not get file with CID: %s", err))
}
err = files.WriteTo(rootNodeFile, outputPathFile)
if err != nil {
panic(fmt.Errorf("Could not write out the fetched CID: %s", err))
}
fmt.Printf("Got file back from IPFS (IPFS path: %s) and wrote it to %s\n", cidFile.String(), outputPathFile)
rootNodeDirectory, err := ipfs.Unixfs().Get(ctx, cidDirectory)
if err != nil {
panic(fmt.Errorf("Could not get file with CID: %s", err))
}
err = files.WriteTo(rootNodeDirectory, outputPathDirectory)
if err != nil {
panic(fmt.Errorf("Could not write out the fetched CID: %s", err))
}
fmt.Printf("Got directory back from IPFS (IPFS path: %s) and wrote it to %s\n", cidDirectory.String(), outputPathDirectory)
/// --- Part IV: Getting a file from the IPFS Network
fmt.Println("\n-- Going to connect to a few nodes in the Network as bootstrappers --")
bootstrapNodes := []string{
// IPFS Bootstrapper nodes.
"/dnsaddr/bootstrap.libp2p.io/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",
"/dnsaddr/bootstrap.libp2p.io/p2p/QmQCU2EcMqAqQPR2i9bChDtGNJchTbq5TbXJJ16u19uLTa",
"/dnsaddr/bootstrap.libp2p.io/p2p/QmbLHAnMoJPWSCR5Zhtx6BHJX9KiKNN6tpvbUcqanj75Nb",
"/dnsaddr/bootstrap.libp2p.io/p2p/QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt",
// IPFS Cluster Pinning nodes
"/ip4/138.201.67.219/tcp/4001/p2p/QmUd6zHcbkbcs7SMxwLs48qZVX3vpcM8errYS7xEczwRMA",
"/ip4/138.201.67.220/tcp/4001/p2p/QmNSYxZAiJHeLdkBg38roksAR9So7Y5eojks1yjEcUtZ7i",
"/ip4/138.201.68.74/tcp/4001/p2p/QmdnXwLrC8p1ueiq2Qya8joNvk3TVVDAut7PrikmZwubtR",
"/ip4/94.130.135.167/tcp/4001/p2p/QmUEMvxS2e7iDrereVYc5SWPauXPyNwxcy9BXZrC1QTcHE",
// You can add more nodes here, for example, another IPFS node you might have running locally, mine was:
// "/ip4/127.0.0.1/tcp/4010/p2p/QmZp2fhDLxjYue2RiUvLwT9MWdnbDxam32qYFnGmxZDh5L",
}
go connectToPeers(ctx, ipfs, bootstrapNodes)
exampleCIDStr := "QmUaoioqU7bxezBQZkUcgcSyokatMY71sxsALxQmRRrHrj"
fmt.Printf("Fetching a file from the network with CID %s\n", exampleCIDStr)
outputPath := outputBasePath + exampleCIDStr
testCID := icorepath.New(exampleCIDStr)
rootNode, err := ipfs.Unixfs().Get(ctx, testCID)
if err != nil {
panic(fmt.Errorf("Could not get file with CID: %s", err))
}
err = files.WriteTo(rootNode, outputPath)
if err != nil {
panic(fmt.Errorf("Could not write out the fetched CID: %s", err))
}
fmt.Printf("Wrote the file to %s\n", outputPath)
fmt.Println("\nAll done! You just finalized your first tutorial on how to use go-ipfs as a library")
}