add base handler and refactor H

service_a/internal/app/app.go

@@ -0,0 +1,3 @@
+package app
+
+type H map[string]any

service_a/internal/domains/handlers.go

@@ -0,0 +1,16 @@
+package domains
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type (
+	BaseHandler struct{}
+)
+
+func (bh *BaseHandler) ToJSON(w http.ResponseWriter, statusCode int, data any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	json.NewEncoder(w).Encode(data)
+}

service_a/internal/domains/meteo/domain.go

@@ -5,8 +5,6 @@ import (
 	"time"
 )
 
-type H map[string]any
-
 type MeteoData struct {
 	Timestamp  time.Time `csv:"fecha"`
 	Location   string    `csv:"ciudad"`
@@ -29,18 +27,52 @@ type FileStats struct {
 	FileChecksum string `json:"file_checksum"`
 }
 
+type GetMeteoData struct {
+	Location string
+	From     string
+	To       string
+	Page     int
+	Limit    int
+}
+
+func (mt *GetMeteoData) Validate() error {
+	if mt.Location == "" {
+		return ErrMissingOrInvalidLocation
+	}
+
+	if mt.From == "" {
+		return ErrMissingOrInvalidFromDate
+	}
+
+	if mt.To == "" {
+		return ErrMissingOrInvalidToDate
+	}
+
+	if _, err := time.Parse("2006-01-02", mt.From); err != nil {
+		return ErrMissingOrInvalidFromDate
+	}
+
+	if _, err := time.Parse("2006-01-02", mt.To); err != nil {
+		return ErrMissingOrInvalidToDate
+	}
+
+	return nil
+}
+
 var (
 	ErrCannotParseFile            = errors.New("cannot parse file")
 	ErrValidateRecord             = errors.New("error validating record")
 	ErrRecordNotValid             = errors.New("record not valid")
 	ErrReadingCSVHeader           = errors.New("error reading CSV header")
 	ErrReadingCSVRow              = errors.New("error reading CSV row")
-	ErrMissingOrInvalidDateField  = errors.New("missing or invalid date field")
-	ErrMissingOrInvalidCityField  = errors.New("missing or invalid city field")
-	ErrMissingOrInvalidMaxTemp    = errors.New("missing or invalid max temp field")
-	ErrMissingOrInvalidMinTemp    = errors.New("missing or invalid min temp field")
-	ErrMissingOrInvalidRainfall   = errors.New("missing or invalid rainfall field")
-	ErrMissingOrInvalidCloudiness = errors.New("missing or invalid cloudiness field")
+	ErrMissingOrInvalidDate       = errors.New("missing or invalid date")
+	ErrMissingOrInvalidFromDate   = errors.New("missing or invalid from date")
+	ErrMissingOrInvalidToDate     = errors.New("missing or invalid to date")
+	ErrMissingOrInvalidLocation   = errors.New("missing or invalid location")
+	ErrMissingOrInvalidMaxTemp    = errors.New("missing or invalid max temp")
+	ErrMissingOrInvalidMinTemp    = errors.New("missing or invalid min temp")
+	ErrMissingOrInvalidRainfall   = errors.New("missing or invalid rainfall")
+	ErrMissingOrInvalidCloudiness = errors.New("missing or invalid cloudiness")
 	ErrMaxTempOutOfRange          = errors.New("max temp out of range (must be <= 60°C)")
 	ErrMinTempOutOfRange          = errors.New("min temp out of range (must be >= -20°C)")
 	ErrRainfallOutOfRange         = errors.New("rainfall out of range (must be 0-500 mm)")

service_a/internal/domains/meteo/file.go

@@ -4,6 +4,7 @@ import (
 	"encoding/csv"
 	"fmt"
 	"io"
+	"servicea/internal/app"
 	"strconv"
 	"strings"
 	"time"
@@ -69,7 +70,7 @@ func (c *CSV) Parse(r io.Reader) ([]MeteoData, []RejectedMeteoData, error) {
 
 		rowValue := strings.Join(row, ";")
 
-		record := make(H)
+		record := make(app.H)
 		for i, value := range row {
 			if i < len(header) {
 				record[header[i]] = value
@@ -99,17 +100,17 @@ func (c *CSV) Parse(r io.Reader) ([]MeteoData, []RejectedMeteoData, error) {
 	return meteoDataList, rejectedDataList, nil
 }
 
-func normalize(record H) (*MeteoData, error) {
+func normalize(record app.H) (*MeteoData, error) {
 	meteoData := &MeteoData{}
 
 	var err error
 
-	meteoData.Timestamp, err = parseDate(record, "Fecha", ErrMissingOrInvalidDateField)
+	meteoData.Timestamp, err = parseDate(record, "Fecha", ErrMissingOrInvalidDate)
 	if err != nil {
 		return nil, err
 	}
 
-	meteoData.Location, err = parseString(record, "Ciudad", ErrMissingOrInvalidCityField)
+	meteoData.Location, err = parseString(record, "Ciudad", ErrMissingOrInvalidLocation)
 	if err != nil {
 		return nil, err
 	}
@@ -137,7 +138,7 @@ func normalize(record H) (*MeteoData, error) {
 	return meteoData, nil
 }
 
-func parseDate(record H, key string, errMissing error) (time.Time, error) {
+func parseDate(record app.H, key string, errMissing error) (time.Time, error) {
 	if str, ok := record[key].(string); ok && str != "" {
 		t, err := time.Parse("2006/01/02", str)
 		if err != nil {
@@ -148,14 +149,14 @@ func parseDate(record H, key string, errMissing error) (time.Time, error) {
 	return time.Time{}, errMissing
 }
 
-func parseString(record H, key string, errMissing error) (string, error) {
+func parseString(record app.H, key string, errMissing error) (string, error) {
 	if str, ok := record[key].(string); ok && str != "" {
 		return str, nil
 	}
 	return "", errMissing
 }
 
-func parseFloatField(record H, key string, errMissing error) (float32, error) {
+func parseFloatField(record app.H, key string, errMissing error) (float32, error) {
 	if str, ok := record[key].(string); ok && str != "" {
 		str = strings.Replace(str, ",", ".", 1)
 		f, err := strconv.ParseFloat(str, 32)
@@ -167,7 +168,7 @@ func parseFloatField(record H, key string, errMissing error) (float32, error) {
 	return 0, errMissing
 }
 
-func parseIntField(record H, key string, errMissing error) (int, error) {
+func parseIntField(record app.H, key string, errMissing error) (int, error) {
 	if str, ok := record[key].(string); ok && str != "" {
 		str = strings.TrimSpace(str)
 		i, err := strconv.Atoi(str)

service_a/internal/domains/meteo/handlers.go

@@ -4,15 +4,18 @@ import (
 	"bytes"
 	"crypto/sha256"
 	"encoding/hex"
-	"encoding/json"
 	"fmt"
 	"io"
 	"log/slog"
 	"net/http"
+	"servicea/internal/app"
+	"servicea/internal/domains"
+	"strconv"
 	"time"
 )
 
 type Handler struct {
+	domains.BaseHandler
 	*Service
 }
 
@@ -68,13 +71,48 @@ func (h *Handler) IngestCSV(w http.ResponseWriter, r *http.Request) {
 		"elapsed_ms", fileStats.ElapsedMS,
 		"file_checksum", fileStats.FileChecksum,
 	)
-
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(H{
-		"stats": fileStats,
-	})
+	h.ToJSON(w, http.StatusOK, app.H{"stats": fileStats})
 }
 
 func (h *Handler) IngestExcel(w http.ResponseWriter, r *http.Request) {
 	fmt.Fprintf(w, "hello from excel")
 }
+
+func (h *Handler) GetMeteoData(w http.ResponseWriter, r *http.Request) {
+	queryParams := r.URL.Query()
+	pageInt := int(1)
+	limitInt := int(10)
+
+	page := queryParams.Get("page")
+	limit := queryParams.Get("limit")
+
+	if page != "" {
+		p, err := strconv.Atoi(page)
+		if err == nil {
+			pageInt = p
+		}
+	}
+
+	if limit != "" {
+		l, err := strconv.Atoi(limit)
+		if err == nil {
+			limitInt = l
+		} else {
+			limitInt = 10
+		}
+	}
+
+	params := GetMeteoData{
+		Location: queryParams.Get("city"),
+		From:     queryParams.Get("from"),
+		To:       queryParams.Get("to"),
+		Page:     pageInt,
+		Limit:    limitInt,
+	}
+
+	if err := params.Validate(); err != nil {
+		h.ToJSON(w, http.StatusBadRequest, app.H{"error": err.Error()})
+	}
+
+	slog.Info("params", "params", params)
+}

service_a/internal/domains/meteo/router.go

@@ -5,4 +5,6 @@ import "net/http"
 func RegisterRoutes(mux *http.ServeMux, handler *Handler) {
 	mux.HandleFunc("POST /ingest/csv", handler.IngestCSV)
 	mux.HandleFunc("POST /ingest/excel", handler.IngestExcel)
+
+	mux.HandleFunc("GET /data", handler.GetMeteoData)
 }

service_a/internal/domains/meteo/service.go

@@ -48,3 +48,7 @@ func (s *Service) UpdateElapsedMS(ctx context.Context, batchID, elapsedMS int) e
 
 	return nil
 }
+
+func (s *Service) GetMeteoData(params GetMeteoData) ([]MeteoData, error) {
+	return []MeteoData{}, nil
+}