forked from TrueCloudLab/neoneo-go
5ef08f60ae
It's not needed any more with Go 1.13 as we have wrapping/unwrapping in base packages. All errors.Wrap calls are replaced with fmt.Errorf, some strings are improved along the way.
77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
package client
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import (
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"errors"
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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/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// PolicyContractHash represents a hash of native Policy contract.
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var PolicyContractHash, _ = util.Uint160DecodeStringBE("e9ff4ca7cc252e1dfddb26315869cd79505906ce")
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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, 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, "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 []stackitem.Item) (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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items, ok := st[index].Value().([]stackitem.Item)
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if !ok {
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return nil, fmt.Errorf("invalid stack item type: %s", st[index].Type())
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}
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ba = make(native.BlockedAccounts, len(items))
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for i, account := range items {
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val, ok := account.Value().([]byte)
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if !ok {
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return nil, fmt.Errorf("invalid array element: %s", account.Type())
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}
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ba[i], err = util.Uint160DecodeBytesLE(val)
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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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return ba, nil
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}
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