91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
package client
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import (
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"fmt"
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"sync/atomic"
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"time"
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"github.com/theater/picomap/lib/halfsiphash"
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"github.com/theater/picomap/lib/msgpack"
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"github.com/theater/picomap/lib/transport"
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)
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var HashKey = [8]byte{}
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type Client struct {
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transport transport.Transport
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timeout time.Duration
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nextID atomic.Uint32
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}
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func New(t transport.Transport, timeout time.Duration) *Client {
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return &Client{transport: t, timeout: timeout}
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}
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func (c *Client) Close() error {
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return c.transport.Close()
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}
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func (c *Client) send(msg any) (uint32, error) {
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id := c.nextID.Add(1)
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payload, err := msgpack.Marshal(msg)
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if err != nil {
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return 0, fmt.Errorf("encode inner: %w", err)
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}
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checksum := halfsiphash.Sum32(payload, HashKey)
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env := Envelope{MessageID: id, Checksum: checksum, Payload: payload}
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data, err := msgpack.Marshal(&env)
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if err != nil {
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return 0, fmt.Errorf("encode envelope: %w", err)
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}
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return id, c.transport.Send(data)
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}
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func (c *Client) receive(expectedID uint32) (any, error) {
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data, err := c.transport.Receive(c.timeout)
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if err != nil {
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return nil, fmt.Errorf("receive: %w", err)
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}
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if len(data) == 0 {
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return nil, fmt.Errorf("no response")
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}
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var env Envelope
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if err := msgpack.Unmarshal(data, &env); err != nil {
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return nil, fmt.Errorf("decode envelope: %w", err)
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}
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if env.MessageID != expectedID {
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return nil, fmt.Errorf("message id mismatch: got %d, want %d", env.MessageID, expectedID)
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}
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expected := halfsiphash.Sum32(env.Payload, HashKey)
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if env.Checksum != expected {
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return nil, fmt.Errorf("checksum mismatch: got %08x, want %08x", env.Checksum, expected)
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}
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var inner any
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if err := msgpack.Unmarshal(env.Payload, &inner); err != nil {
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return nil, fmt.Errorf("decode inner: %w", err)
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}
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if devErr, ok := inner.(*DeviceError); ok {
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return nil, devErr
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}
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return inner, nil
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}
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func (c *Client) roundTrip(req any) (any, error) {
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id, err := c.send(req)
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if err != nil {
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return nil, err
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}
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return c.receive(id)
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}
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func (c *Client) BOOTSEL() error {
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resp, err := c.roundTrip(&RequestBOOTSEL{})
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if err != nil {
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return err
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}
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if _, ok := resp.(*ResponseBOOTSEL); !ok {
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return fmt.Errorf("unexpected response: %T", resp)
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}
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return nil
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}
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