Mining/pkg/mining/stats_collector.go

package mining

import (
	"context"
	"io"
	"net/http"
	"strconv"
)

// var collector StatsCollector = &XMRigStatsCollector{...}
// metrics, err := collector.CollectStats(ctx)
type StatsCollector interface {
	CollectStats(ctx context.Context) (*PerformanceMetrics, error)
}

// HTTPStatsConfig{Host: "127.0.0.1", Port: 8080, Endpoint: "/2/summary"}
type HTTPStatsConfig struct {
	Host     string
	Port     int
	Endpoint string // e.g., "/2/summary" for XMRig, "/summary" for TT-Miner
}

// var summary XMRigSummary
// if err := FetchJSONStats(ctx, HTTPStatsConfig{Host: "127.0.0.1", Port: 8080, Endpoint: "/2/summary"}, &summary); err != nil { return err }
func FetchJSONStats[T any](ctx context.Context, config HTTPStatsConfig, target *T) error {
	if config.Port == 0 {
		return ErrInternal("API port is zero")
	}

	requestURL := "http://" + config.Host + ":" + strconv.Itoa(config.Port) + config.Endpoint

	httpRequest, err := http.NewRequestWithContext(ctx, "GET", requestURL, nil)
	if err != nil {
		return ErrInternal("failed to create request").WithCause(err)
	}

	response, err := getHTTPClient().Do(httpRequest)
	if err != nil {
		return ErrInternal("HTTP request failed").WithCause(err)
	}
	defer response.Body.Close()

	if response.StatusCode != http.StatusOK {
		io.Copy(io.Discard, response.Body) // Drain body to allow connection reuse
		return ErrInternal("unexpected status code: " + strconv.Itoa(response.StatusCode))
	}

	body, err := io.ReadAll(response.Body)
	if err != nil {
		return ErrInternal("failed to read response body").WithCause(err)
	}
	if err := UnmarshalJSON(body, target); err != nil {
		return ErrInternal("failed to decode response").WithCause(err)
	}

	return nil
}