-
Notifications
You must be signed in to change notification settings - Fork 245
/
latest_logs.go
70 lines (64 loc) · 1.9 KB
/
latest_logs.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
package rpcfilters
import (
"context"
"math/big"
"time"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
getRpc "github.com/ethereum/go-ethereum/rpc"
)
// ContextCaller provides CallContext method as ethereums rpc.Client.
type ContextCaller interface {
CallContext(ctx context.Context, result interface{}, chainID uint64, method string, args ...interface{}) error
}
func pollLogs(client ContextCaller, chainID uint64, f *logsFilter, timeout, period time.Duration) {
query := func() {
ctx, cancel := context.WithTimeout(f.ctx, timeout)
defer cancel()
logs, err := getLogs(ctx, client, chainID, f.criteria())
if err != nil {
log.Error("Error fetch logs", "criteria", f.crit, "error", err)
return
}
if err := f.add(logs); err != nil {
log.Error("Error adding logs", "logs", logs, "error", err)
}
}
query()
latest := time.NewTicker(period)
defer latest.Stop()
for {
select {
case <-latest.C:
query()
case <-f.done:
log.Debug("Filter was stopped", "ID", f.id, "crit", f.crit)
return
}
}
}
func getLogs(ctx context.Context, client ContextCaller, chainID uint64, crit ethereum.FilterQuery) (rst []types.Log, err error) {
return rst, client.CallContext(ctx, &rst, chainID, "eth_getLogs", toFilterArg(crit))
}
func toFilterArg(q ethereum.FilterQuery) interface{} {
arg := map[string]interface{}{
"fromBlock": toBlockNumArg(q.FromBlock),
"toBlock": toBlockNumArg(q.ToBlock),
"address": q.Addresses,
"topics": q.Topics,
}
if q.FromBlock == nil {
arg["fromBlock"] = "0x0"
}
return arg
}
func toBlockNumArg(number *big.Int) string {
if number == nil || number.Int64() == getRpc.LatestBlockNumber.Int64() {
return "latest"
} else if number.Int64() == getRpc.PendingBlockNumber.Int64() {
return "pending"
}
return hexutil.EncodeBig(number)
}