/
random.go
115 lines (107 loc) · 2.8 KB
/
random.go
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package test
import (
"fmt"
"math/rand"
"sync/atomic"
"github.com/ipfs/go-cid"
"github.com/ipni/go-libipni/ingest/schema"
"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/test"
"github.com/multiformats/go-multiaddr"
"github.com/multiformats/go-multihash"
)
var globalSeed atomic.Int64
// RandomAddrs returns a slice of n random unique addresses.
func RandomAddrs(n int) []string {
rng := rand.New(rand.NewSource(globalSeed.Add(1)))
addrs := make([]string, n)
addrSet := make(map[string]struct{})
for i := 0; i < n; i++ {
addr := fmt.Sprintf("/ip4/%d.%d.%d.%d/tcp/%d", rng.Int()%255, rng.Intn(254)+1, rng.Intn(254)+1, rng.Intn(254)+1, rng.Intn(48157)+1024)
if _, ok := addrSet[addr]; ok {
i--
continue
}
addrs[i] = addr
}
return addrs
}
// RandomMultiaddrs returns a slice of n random unique Multiaddrs.
func RandomMultiaddrs(n int) []multiaddr.Multiaddr {
rng := rand.New(rand.NewSource(globalSeed.Add(1)))
maddrs := make([]multiaddr.Multiaddr, n)
addrSet := make(map[string]struct{})
for i := 0; i < n; i++ {
addr := fmt.Sprintf("/ip4/%d.%d.%d.%d/tcp/%d", rng.Int()%255, rng.Intn(254)+1, rng.Intn(254)+1, rng.Intn(254)+1, rng.Intn(48157)+1024)
if _, ok := addrSet[addr]; ok {
i--
continue
}
maddr, err := multiaddr.NewMultiaddr(addr)
if err != nil {
panic(err)
}
maddrs[i] = maddr
}
return maddrs
}
// RandomCids returns a slice of n random unique CIDs.
func RandomCids(n int) []cid.Cid {
rng := rand.New(rand.NewSource(globalSeed.Add(1)))
prefix := schema.Linkproto.Prefix
cids := make([]cid.Cid, n)
set := make(map[string]struct{})
for i := 0; i < n; i++ {
b := make([]byte, 10*n)
rng.Read(b)
if _, ok := set[string(b)]; ok {
i--
continue
}
c, err := prefix.Sum(b)
if err != nil {
panic(err)
}
cids[i] = c
}
return cids
}
// RandomIdentity returns a random unique peer ID, private key, and public key.
func RandomIdentity() (peer.ID, crypto.PrivKey, crypto.PubKey) {
retry:
privKey, pubKey, err := test.RandTestKeyPair(crypto.Ed25519, 256)
if err != nil {
panic(err)
}
peerID, err := peer.IDFromPublicKey(pubKey)
if err != nil {
panic(err)
}
idSet := make(map[peer.ID]struct{})
if _, ok := idSet[peerID]; ok {
goto retry
}
return peerID, privKey, pubKey
}
// RandomMultihashes returns a slice of n random unique Multihashes.
func RandomMultihashes(n int) []multihash.Multihash {
rng := rand.New(rand.NewSource(globalSeed.Add(1)))
prefix := schema.Linkproto.Prefix
set := make(map[string]struct{})
mhashes := make([]multihash.Multihash, n)
for i := 0; i < n; i++ {
b := make([]byte, 10*n+16)
rng.Read(b)
if _, ok := set[string(b)]; ok {
i--
continue
}
c, err := prefix.Sum(b)
if err != nil {
panic(err.Error())
}
mhashes[i] = c.Hash()
}
return mhashes
}