77 lines
2.5 KiB
Go
77 lines
2.5 KiB
Go
package client
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import (
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/core/native"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/pkg/errors"
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)
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// PolicyContractHash represents BE hash of native Policy contract.
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var PolicyContractHash = util.Uint160{154, 97, 164, 110, 236, 151, 184, 147, 6, 215, 206, 129, 241, 91, 70, 32, 145, 208, 9, 50}
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// GetMaxTransactionsPerBlock invokes `getMaxTransactionsPerBlock` method on a
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// native Policy contract.
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func (c *Client) GetMaxTransactionsPerBlock() (int64, error) {
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return c.invokeNativePolicyMethod("getMaxTransactionsPerBlock")
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}
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// GetMaxBlockSize invokes `getMaxBlockSize` method on a native Policy contract.
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func (c *Client) GetMaxBlockSize() (int64, error) {
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return c.invokeNativePolicyMethod("getMaxBlockSize")
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}
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// GetFeePerByte invokes `getFeePerByte` method on a native Policy contract.
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func (c *Client) GetFeePerByte() (int64, error) {
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return c.invokeNativePolicyMethod("getFeePerByte")
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}
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func (c *Client) invokeNativePolicyMethod(operation string) (int64, error) {
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result, err := c.InvokeFunction(PolicyContractHash.StringLE(), operation, []smartcontract.Parameter{}, nil)
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if err != nil {
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return 0, err
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} else if result.State != "HALT" || len(result.Stack) == 0 {
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return 0, errors.New("invalid VM state")
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}
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return topIntFromStack(result.Stack)
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}
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// GetBlockedAccounts invokes `getBlockedAccounts` method on a native Policy contract.
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func (c *Client) GetBlockedAccounts() (native.BlockedAccounts, error) {
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result, err := c.InvokeFunction(PolicyContractHash.StringLE(), "getBlockedAccounts", []smartcontract.Parameter{}, nil)
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if err != nil {
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return nil, err
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} else if result.State != "HALT" || len(result.Stack) == 0 {
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return nil, errors.New("invalid VM state")
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}
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return topBlockedAccountsFromStack(result.Stack)
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}
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func topBlockedAccountsFromStack(st []smartcontract.Parameter) (native.BlockedAccounts, error) {
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index := len(st) - 1 // top stack element is last in the array
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var (
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ba native.BlockedAccounts
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err error
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)
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switch typ := st[index].Type; typ {
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case smartcontract.ArrayType:
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data, ok := st[index].Value.([]smartcontract.Parameter)
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if !ok {
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return nil, errors.New("invalid Array item")
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}
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ba = make(native.BlockedAccounts, len(data))
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for i, account := range data {
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ba[i], err = util.Uint160DecodeBytesLE(account.Value.([]byte))
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if err != nil {
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return nil, err
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}
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}
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default:
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return nil, fmt.Errorf("invalid stack item type: %s", typ)
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}
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return ba, nil
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}
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