Search/node-request-video.go

//go:build experimental
// +build experimental

package main

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"time"
)

var videoResultsChan = make(chan []VideoResult)

func tryOtherNodesForVideoSearch(query, safe, lang string, page int) []VideoResult {
	for _, node := range sockets {
		results, err := sendVideoSearchRequestToNode(node, query, safe, lang, page)
		if err != nil {
			printWarn("Error contacting node %s: %v", node, err)
			continue
		}
		if len(results) > 0 {
			return results
		}
	}
	return nil
}

func sendVideoSearchRequestToNode(target, query, safe, lang string, page int) ([]VideoResult, error) {
	payload, err := encodeSearchTextParams(query, safe, lang, page)
	if err != nil {
		return nil, fmt.Errorf("encode error: %v", err)
	}

	msg := Message{
		ID:      generateMessageID(),
		Type:    MsgTypeSearchVideoRequest,
		Content: payload,
		Target:  target,
	}

	if err := sendMessage(msg); err != nil {
		return nil, fmt.Errorf("send error: %v", err)
	}

	select {
	case res := <-videoResultsChan:
		return res, nil
	case <-time.After(20 * time.Second):
		return nil, fmt.Errorf("timeout waiting for results from node %s", target)
	}
}

func handleVideoResultsMessage(msg Message) {
	results, err := decodeVideoResults([]byte(msg.Content))
	if err != nil {
		printWarn("Error decoding video results: %v", err)
		return
	}
	printDebug("Received video results: %+v", results)

	go func() {
		videoResultsChan <- results
	}()
}

func encodeVideoResults(results []VideoResult) ([]byte, error) {
	buf := new(bytes.Buffer)

	if err := binary.Write(buf, binary.BigEndian, uint16(len(results))); err != nil {
		return nil, err
	}

	for _, r := range results {
		if err := writeString(buf, r.Href); err != nil {
			return nil, err
		}
		if err := writeString(buf, r.Title); err != nil {
			return nil, err
		}
		if err := writeString(buf, r.Date); err != nil {
			return nil, err
		}
		if err := writeString(buf, r.Views); err != nil {
			return nil, err
		}
		if err := writeString(buf, r.Creator); err != nil {
			return nil, err
		}
		if err := writeString(buf, r.Publisher); err != nil {
			return nil, err
		}
		if err := writeString(buf, r.Image); err != nil {
			return nil, err
		}
		if err := writeString(buf, r.Duration); err != nil {
			return nil, err
		}
	}

	return buf.Bytes(), nil
}

func decodeVideoResults(data []byte) ([]VideoResult, error) {
	buf := bytes.NewReader(data)

	var count uint16
	if err := binary.Read(buf, binary.BigEndian, &count); err != nil {
		return nil, err
	}

	results := make([]VideoResult, 0, count)
	for i := 0; i < int(count); i++ {
		href, err := readString(buf)
		if err != nil {
			return nil, err
		}
		title, err := readString(buf)
		if err != nil {
			return nil, err
		}
		date, err := readString(buf)
		if err != nil {
			return nil, err
		}
		views, err := readString(buf)
		if err != nil {
			return nil, err
		}
		creator, err := readString(buf)
		if err != nil {
			return nil, err
		}
		publisher, err := readString(buf)
		if err != nil {
			return nil, err
		}
		image, err := readString(buf)
		if err != nil {
			return nil, err
		}
		duration, err := readString(buf)
		if err != nil {
			return nil, err
		}

		results = append(results, VideoResult{
			Href:      href,
			Title:     title,
			Date:      date,
			Views:     views,
			Creator:   creator,
			Publisher: publisher,
			Image:     image,
			Duration:  duration,
		})
	}
	return results, nil
}