neo-go/pkg/rpc/client/policy.go

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package client
import (
"fmt"
"github.com/nspcc-dev/neo-go/pkg/core/native"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"github.com/pkg/errors"
)
// PolicyContractHash represents a hash of native Policy contract.
var PolicyContractHash, _ = util.Uint160DecodeStringBE("e9ff4ca7cc252e1dfddb26315869cd79505906ce")
// GetMaxTransactionsPerBlock invokes `getMaxTransactionsPerBlock` method on a
// native Policy contract.
func (c *Client) GetMaxTransactionsPerBlock() (int64, error) {
return c.invokeNativePolicyMethod("getMaxTransactionsPerBlock")
}
// GetMaxBlockSize invokes `getMaxBlockSize` method on a native Policy contract.
func (c *Client) GetMaxBlockSize() (int64, error) {
return c.invokeNativePolicyMethod("getMaxBlockSize")
}
// GetFeePerByte invokes `getFeePerByte` method on a native Policy contract.
func (c *Client) GetFeePerByte() (int64, error) {
return c.invokeNativePolicyMethod("getFeePerByte")
}
func (c *Client) invokeNativePolicyMethod(operation string) (int64, error) {
result, err := c.InvokeFunction(PolicyContractHash, operation, []smartcontract.Parameter{}, nil)
if err != nil {
return 0, err
} else if result.State != "HALT" || len(result.Stack) == 0 {
return 0, errors.New("invalid VM state")
}
return topIntFromStack(result.Stack)
}
// GetBlockedAccounts invokes `getBlockedAccounts` method on a native Policy contract.
func (c *Client) GetBlockedAccounts() (native.BlockedAccounts, error) {
result, err := c.InvokeFunction(PolicyContractHash, "getBlockedAccounts", []smartcontract.Parameter{}, nil)
if err != nil {
return nil, err
} else if result.State != "HALT" || len(result.Stack) == 0 {
return nil, errors.New("invalid VM state")
}
return topBlockedAccountsFromStack(result.Stack)
}
func topBlockedAccountsFromStack(st []stackitem.Item) (native.BlockedAccounts, error) {
index := len(st) - 1 // top stack element is last in the array
var (
ba native.BlockedAccounts
err error
)
items, ok := st[index].Value().([]stackitem.Item)
if !ok {
return nil, fmt.Errorf("invalid stack item type: %s", st[index].Type())
}
ba = make(native.BlockedAccounts, len(items))
for i, account := range items {
val, ok := account.Value().([]byte)
if !ok {
return nil, fmt.Errorf("invalid array element: %s", account.Type())
}
ba[i], err = util.Uint160DecodeBytesLE(val)
if err != nil {
return nil, err
}
}
return ba, nil
}