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filters_eth.go
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/
filters_eth.go
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package subscriptions
import (
"fmt"
"github.com/status-im/status-go/rpc"
)
type ethFilter struct {
id string
rpcClient *rpc.Client
}
func installEthFilter(rpcClient *rpc.Client, method string, args []interface{}) (*ethFilter, error) {
if err := validateEthMethod(method); err != nil {
return nil, err
}
var result string
err := rpcClient.Call(&result, method, args...)
if err != nil {
return nil, err
}
filter := ðFilter{
id: result,
rpcClient: rpcClient,
}
return filter, nil
}
func (ef *ethFilter) getID() string {
return ef.id
}
func (ef *ethFilter) getChanges() ([]interface{}, error) {
var result []interface{}
err := ef.rpcClient.Call(&result, "eth_getFilterChanges", ef.getID())
return result, err
}
func (ef *ethFilter) uninstall() error {
return ef.rpcClient.Call(nil, "eth_uninstallFilter", ef.getID())
}
func validateEthMethod(method string) error {
for _, allowedMethod := range []string{
"eth_newFilter",
"eth_newBlockFilter",
"eth_newPendingTransactionFilter",
} {
if method == allowedMethod {
return nil
}
}
return fmt.Errorf("unexpected filter method: %s", method)
}