service backend

api/fx/ingestor/internal/market/coingecko/connector.go

@@ -0,0 +1,222 @@
+package coingecko
+
+import (
+	"context"
+	"encoding/json"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	"github.com/tech/sendico/fx/ingestor/internal/market/common"
+	mmodel "github.com/tech/sendico/fx/ingestor/internal/model"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/model"
+	"go.uber.org/zap"
+)
+
+type coingeckoConnector struct {
+	id       mmodel.Driver
+	provider string
+	client   *http.Client
+	base     string
+	logger   mlogger.Logger
+}
+
+const defaultCoinGeckoBaseURL = "https://api.coingecko.com/api/v3"
+
+const (
+	defaultDialTimeoutSeconds           = 5 * time.Second
+	defaultDialKeepAliveSeconds         = 30 * time.Second
+	defaultTLSHandshakeTimeoutSeconds   = 5 * time.Second
+	defaultResponseHeaderTimeoutSeconds = 10 * time.Second
+	defaultRequestTimeoutSeconds        = 10 * time.Second
+)
+
+func NewConnector(logger mlogger.Logger, settings model.SettingsT) (mmodel.Connector, error) {
+	baseURL := defaultCoinGeckoBaseURL
+	provider := strings.ToLower(mmodel.DriverCoinGecko.String())
+	dialTimeout := defaultDialTimeoutSeconds
+	dialKeepAlive := defaultDialKeepAliveSeconds
+	tlsHandshakeTimeout := defaultTLSHandshakeTimeoutSeconds
+	responseHeaderTimeout := defaultResponseHeaderTimeoutSeconds
+	requestTimeout := defaultRequestTimeoutSeconds
+
+	if settings != nil {
+		if value, ok := settings["base_url"].(string); ok && strings.TrimSpace(value) != "" {
+			baseURL = strings.TrimSpace(value)
+		}
+		if value, ok := settings["provider"].(string); ok && strings.TrimSpace(value) != "" {
+			provider = strings.TrimSpace(value)
+		}
+		dialTimeout = common.DurationSetting(settings, "dial_timeout_seconds", dialTimeout)
+		dialKeepAlive = common.DurationSetting(settings, "dial_keep_alive_seconds", dialKeepAlive)
+		tlsHandshakeTimeout = common.DurationSetting(settings, "tls_handshake_timeout_seconds", tlsHandshakeTimeout)
+		responseHeaderTimeout = common.DurationSetting(settings, "response_header_timeout_seconds", responseHeaderTimeout)
+		requestTimeout = common.DurationSetting(settings, "request_timeout_seconds", requestTimeout)
+	}
+
+	parsed, err := url.Parse(baseURL)
+	if err != nil {
+		return nil, fmerrors.Wrap("coingecko: invalid base url", err)
+	}
+
+	transport := &http.Transport{
+		DialContext:           (&net.Dialer{Timeout: dialTimeout, KeepAlive: dialKeepAlive}).DialContext,
+		TLSHandshakeTimeout:   tlsHandshakeTimeout,
+		ResponseHeaderTimeout: responseHeaderTimeout,
+	}
+
+	connector := &coingeckoConnector{
+		id:       mmodel.DriverCoinGecko,
+		provider: provider,
+		client: &http.Client{
+			Timeout:   requestTimeout,
+			Transport: transport,
+		},
+		base:   strings.TrimRight(parsed.String(), "/"),
+		logger: logger.Named("coingecko"),
+	}
+
+	return connector, nil
+}
+
+func (c *coingeckoConnector) ID() mmodel.Driver {
+	return c.id
+}
+
+func (c *coingeckoConnector) FetchTicker(ctx context.Context, symbol string) (*mmodel.Ticker, error) {
+	coinID, vsCurrency, err := parseSymbol(symbol)
+	if err != nil {
+		return nil, err
+	}
+
+	endpoint, err := url.Parse(c.base)
+	if err != nil {
+		return nil, fmerrors.Wrap("coingecko: parse base url", err)
+	}
+	endpoint.Path = strings.TrimRight(endpoint.Path, "/") + "/simple/price"
+	query := endpoint.Query()
+	query.Set("ids", coinID)
+	query.Set("vs_currencies", vsCurrency)
+	query.Set("include_last_updated_at", "true")
+	endpoint.RawQuery = query.Encode()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), nil)
+	if err != nil {
+		return nil, fmerrors.Wrap("coingecko: build request", err)
+	}
+
+	resp, err := c.client.Do(req)
+	if err != nil {
+		c.logger.Warn("CoinGecko request failed", zap.String("symbol", symbol), zap.Error(err))
+		return nil, fmerrors.Wrap("coingecko: request failed", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		c.logger.Warn("CoinGecko returned non-OK status", zap.String("symbol", symbol), zap.Int("status", resp.StatusCode))
+		return nil, fmerrors.New("coingecko: unexpected status " + strconv.Itoa(resp.StatusCode))
+	}
+
+	decoder := json.NewDecoder(resp.Body)
+	decoder.UseNumber()
+
+	var payload map[string]map[string]interface{}
+	if err := decoder.Decode(&payload); err != nil {
+		c.logger.Warn("CoinGecko decode failed", zap.String("symbol", symbol), zap.Error(err))
+		return nil, fmerrors.Wrap("coingecko: decode response", err)
+	}
+
+	coinData, ok := payload[coinID]
+	if !ok {
+		return nil, fmerrors.New("coingecko: coin id not found in response")
+	}
+	priceValue, ok := coinData[vsCurrency]
+	if !ok {
+		return nil, fmerrors.New("coingecko: vs currency not found in response")
+	}
+
+	price, ok := toFloat(priceValue)
+	if !ok || price <= 0 {
+		return nil, fmerrors.New("coingecko: invalid price value in response")
+	}
+
+	priceStr := strconv.FormatFloat(price, 'f', -1, 64)
+
+	timestamp := time.Now().UnixMilli()
+	if tsValue, ok := coinData["last_updated_at"]; ok {
+		if tsFloat, ok := toFloat(tsValue); ok && tsFloat > 0 {
+			tsMillis := int64(tsFloat * 1000)
+			if tsMillis > 0 {
+				timestamp = tsMillis
+			}
+		}
+	}
+
+	refSymbol := coinID + "_" + vsCurrency
+
+	return &mmodel.Ticker{
+		Symbol:    refSymbol,
+		BidPrice:  priceStr,
+		AskPrice:  priceStr,
+		Provider:  c.provider,
+		Timestamp: timestamp,
+	}, nil
+}
+
+func parseSymbol(symbol string) (string, string, error) {
+	trimmed := strings.TrimSpace(symbol)
+	if trimmed == "" {
+		return "", "", fmerrors.New("coingecko: symbol is empty")
+	}
+
+	parts := strings.FieldsFunc(strings.ToLower(trimmed), func(r rune) bool {
+		switch r {
+		case ':', '/', '-', '_':
+			return true
+		}
+		return false
+	})
+
+	if len(parts) != 2 {
+		return "", "", fmerrors.New("coingecko: symbol must be <coin_id>/<vs_currency>")
+	}
+
+	coinID := strings.TrimSpace(parts[0])
+	vsCurrency := strings.TrimSpace(parts[1])
+	if coinID == "" || vsCurrency == "" {
+		return "", "", fmerrors.New("coingecko: symbol contains empty segments")
+	}
+
+	return coinID, vsCurrency, nil
+}
+
+func toFloat(value interface{}) (float64, bool) {
+	switch v := value.(type) {
+	case json.Number:
+		f, err := v.Float64()
+		if err != nil {
+			return 0, false
+		}
+		return f, true
+	case float64:
+		return v, true
+	case float32:
+		return float64(v), true
+	case int:
+		return float64(v), true
+	case int64:
+		return float64(v), true
+	case uint64:
+		return float64(v), true
+	case string:
+		if parsed, err := strconv.ParseFloat(v, 64); err == nil {
+			return parsed, true
+		}
+	}
+	return 0, false
+}