mirror of
https://github.com/bitechdev/ResolveSpec.git
synced 2025-11-13 09:53:53 +00:00
617 lines
19 KiB
Go
617 lines
19 KiB
Go
package restheadspec
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"reflect"
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"strings"
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"github.com/Warky-Devs/ResolveSpec/pkg/common"
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"github.com/Warky-Devs/ResolveSpec/pkg/logger"
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)
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// Handler handles API requests using database and model abstractions
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// This handler reads filters, columns, and options from HTTP headers
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type Handler struct {
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db common.Database
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registry common.ModelRegistry
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}
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// NewHandler creates a new API handler with database and registry abstractions
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func NewHandler(db common.Database, registry common.ModelRegistry) *Handler {
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return &Handler{
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db: db,
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registry: registry,
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}
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}
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// Handle processes API requests through router-agnostic interface
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// Options are read from HTTP headers instead of request body
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func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[string]string) {
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ctx := context.Background()
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schema := params["schema"]
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entity := params["entity"]
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id := params["id"]
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// Parse options from headers (now returns ExtendedRequestOptions)
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options := h.parseOptionsFromHeaders(r)
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// Determine operation based on HTTP method
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method := r.Method()
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logger.Info("Handling %s request for %s.%s", method, schema, entity)
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switch method {
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case "GET":
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if id != "" {
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// GET with ID - read single record
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h.handleRead(ctx, w, schema, entity, id, options)
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} else {
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// GET without ID - read multiple records
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h.handleRead(ctx, w, schema, entity, "", options)
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}
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case "POST":
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// Create operation
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body, err := r.Body()
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if err != nil {
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logger.Error("Failed to read request body: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_request", "Failed to read request body", err)
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return
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}
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var data interface{}
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if err := json.Unmarshal(body, &data); err != nil {
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logger.Error("Failed to decode request body: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_request", "Invalid request body", err)
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return
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}
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h.handleCreate(ctx, w, schema, entity, data, options)
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case "PUT", "PATCH":
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// Update operation
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body, err := r.Body()
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if err != nil {
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logger.Error("Failed to read request body: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_request", "Failed to read request body", err)
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return
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}
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var data interface{}
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if err := json.Unmarshal(body, &data); err != nil {
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logger.Error("Failed to decode request body: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_request", "Invalid request body", err)
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return
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}
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h.handleUpdate(ctx, w, schema, entity, id, nil, data, options)
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case "DELETE":
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h.handleDelete(ctx, w, schema, entity, id)
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default:
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logger.Error("Invalid HTTP method: %s", method)
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h.sendError(w, http.StatusMethodNotAllowed, "invalid_method", "Invalid HTTP method", nil)
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}
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}
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// HandleGet processes GET requests for metadata
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func (h *Handler) HandleGet(w common.ResponseWriter, r common.Request, params map[string]string) {
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schema := params["schema"]
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entity := params["entity"]
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logger.Info("Getting metadata for %s.%s", schema, entity)
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model, err := h.registry.GetModelByEntity(schema, entity)
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if err != nil {
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logger.Error("Failed to get model: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
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return
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}
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metadata := h.generateMetadata(schema, entity, model)
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h.sendResponse(w, metadata, nil)
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}
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// parseOptionsFromHeaders is now implemented in headers.go
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func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schema, entity, id string, options ExtendedRequestOptions) {
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logger.Info("Reading records from %s.%s", schema, entity)
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model, err := h.registry.GetModelByEntity(schema, entity)
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if err != nil {
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logger.Error("Invalid entity: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
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return
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}
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query := h.db.NewSelect().Model(model)
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// Get table name
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tableName := h.getTableName(schema, entity, model)
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query = query.Table(tableName)
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// Apply column selection
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if len(options.Columns) > 0 {
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logger.Debug("Selecting columns: %v", options.Columns)
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query = query.Column(options.Columns...)
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}
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// Apply preloading
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for _, preload := range options.Preload {
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logger.Debug("Applying preload: %s", preload.Relation)
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query = query.Preload(preload.Relation)
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}
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// Apply expand (LEFT JOIN)
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for _, expand := range options.Expand {
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logger.Debug("Applying expand: %s", expand.Relation)
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// Note: Expand would require JOIN implementation
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// For now, we'll use Preload as a fallback
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query = query.Preload(expand.Relation)
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}
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// Apply DISTINCT if requested
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if options.Distinct {
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logger.Debug("Applying DISTINCT")
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// Note: DISTINCT implementation depends on ORM support
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// This may need to be handled differently per database adapter
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}
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// Apply filters
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for _, filter := range options.Filters {
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logger.Debug("Applying filter: %s %s %v", filter.Column, filter.Operator, filter.Value)
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query = h.applyFilter(query, filter)
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}
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// Apply custom SQL WHERE clause (AND condition)
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if options.CustomSQLWhere != "" {
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logger.Debug("Applying custom SQL WHERE: %s", options.CustomSQLWhere)
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query = query.Where(options.CustomSQLWhere)
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}
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// Apply custom SQL WHERE clause (OR condition)
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if options.CustomSQLOr != "" {
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logger.Debug("Applying custom SQL OR: %s", options.CustomSQLOr)
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query = query.WhereOr(options.CustomSQLOr)
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}
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// If ID is provided, filter by ID
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if id != "" {
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logger.Debug("Filtering by ID: %s", id)
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query = query.Where("id = ?", id)
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}
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// Apply sorting
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for _, sort := range options.Sort {
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direction := "ASC"
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if strings.ToLower(sort.Direction) == "desc" {
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direction = "DESC"
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}
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logger.Debug("Applying sort: %s %s", sort.Column, direction)
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query = query.Order(fmt.Sprintf("%s %s", sort.Column, direction))
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}
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// Get total count before pagination (unless skip count is requested)
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var total int
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if !options.SkipCount {
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count, err := query.Count(ctx)
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if err != nil {
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logger.Error("Error counting records: %v", err)
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h.sendError(w, http.StatusInternalServerError, "query_error", "Error counting records", err)
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return
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}
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total = count
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logger.Debug("Total records: %d", total)
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} else {
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logger.Debug("Skipping count as requested")
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total = -1 // Indicate count was skipped
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}
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// Apply pagination
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if options.Limit != nil && *options.Limit > 0 {
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logger.Debug("Applying limit: %d", *options.Limit)
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query = query.Limit(*options.Limit)
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}
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if options.Offset != nil && *options.Offset > 0 {
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logger.Debug("Applying offset: %d", *options.Offset)
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query = query.Offset(*options.Offset)
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}
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// Execute query
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resultSlice := reflect.New(reflect.SliceOf(reflect.TypeOf(model))).Interface()
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if err := query.Scan(ctx, resultSlice); err != nil {
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logger.Error("Error executing query: %v", err)
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h.sendError(w, http.StatusInternalServerError, "query_error", "Error executing query", err)
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return
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}
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limit := 0
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if options.Limit != nil {
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limit = *options.Limit
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}
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offset := 0
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if options.Offset != nil {
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offset = *options.Offset
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}
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metadata := &common.Metadata{
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Total: int64(total),
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Filtered: int64(total),
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Limit: limit,
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Offset: offset,
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}
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h.sendFormattedResponse(w, resultSlice, metadata, options)
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}
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func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, schema, entity string, data interface{}, options ExtendedRequestOptions) {
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logger.Info("Creating record in %s.%s", schema, entity)
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model, err := h.registry.GetModelByEntity(schema, entity)
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if err != nil {
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logger.Error("Invalid entity: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
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return
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}
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tableName := h.getTableName(schema, entity, model)
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// Handle batch creation
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dataValue := reflect.ValueOf(data)
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if dataValue.Kind() == reflect.Slice || dataValue.Kind() == reflect.Array {
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logger.Debug("Batch creation detected, count: %d", dataValue.Len())
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// Use transaction for batch insert
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err := h.db.RunInTransaction(ctx, func(tx common.Database) error {
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for i := 0; i < dataValue.Len(); i++ {
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item := dataValue.Index(i).Interface()
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// Convert item to model type
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modelValue := reflect.New(reflect.TypeOf(model).Elem()).Interface()
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jsonData, err := json.Marshal(item)
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if err != nil {
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return fmt.Errorf("failed to marshal item: %w", err)
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}
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if err := json.Unmarshal(jsonData, modelValue); err != nil {
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return fmt.Errorf("failed to unmarshal item: %w", err)
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}
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query := tx.NewInsert().Model(modelValue).Table(tableName)
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if _, err := query.Exec(ctx); err != nil {
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return fmt.Errorf("failed to insert record: %w", err)
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}
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}
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return nil
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})
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if err != nil {
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logger.Error("Error creating records: %v", err)
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h.sendError(w, http.StatusInternalServerError, "create_error", "Error creating records", err)
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return
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}
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h.sendResponse(w, map[string]interface{}{"created": dataValue.Len()}, nil)
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return
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}
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// Single record creation
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modelValue := reflect.New(reflect.TypeOf(model).Elem()).Interface()
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jsonData, err := json.Marshal(data)
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if err != nil {
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logger.Error("Error marshaling data: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_data", "Invalid data format", err)
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return
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}
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if err := json.Unmarshal(jsonData, modelValue); err != nil {
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logger.Error("Error unmarshaling data: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_data", "Invalid data format", err)
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return
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}
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query := h.db.NewInsert().Model(modelValue).Table(tableName)
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if _, err := query.Exec(ctx); err != nil {
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logger.Error("Error creating record: %v", err)
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h.sendError(w, http.StatusInternalServerError, "create_error", "Error creating record", err)
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return
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}
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h.sendResponse(w, modelValue, nil)
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}
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func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, schema, entity, id string, idPtr *int64, data interface{}, options ExtendedRequestOptions) {
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logger.Info("Updating record in %s.%s", schema, entity)
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model, err := h.registry.GetModelByEntity(schema, entity)
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if err != nil {
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logger.Error("Invalid entity: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
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return
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}
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tableName := h.getTableName(schema, entity, model)
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// Convert data to map
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dataMap, ok := data.(map[string]interface{})
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if !ok {
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jsonData, err := json.Marshal(data)
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if err != nil {
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logger.Error("Error marshaling data: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_data", "Invalid data format", err)
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return
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}
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if err := json.Unmarshal(jsonData, &dataMap); err != nil {
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logger.Error("Error unmarshaling data: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_data", "Invalid data format", err)
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return
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}
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}
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query := h.db.NewUpdate().Table(tableName).SetMap(dataMap)
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// Apply ID filter
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if id != "" {
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query = query.Where("id = ?", id)
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} else if idPtr != nil {
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query = query.Where("id = ?", *idPtr)
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} else {
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h.sendError(w, http.StatusBadRequest, "missing_id", "ID is required for update", nil)
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return
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}
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result, err := query.Exec(ctx)
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if err != nil {
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logger.Error("Error updating record: %v", err)
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h.sendError(w, http.StatusInternalServerError, "update_error", "Error updating record", err)
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return
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}
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h.sendResponse(w, map[string]interface{}{
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"updated": result.RowsAffected(),
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}, nil)
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}
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func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, schema, entity, id string) {
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logger.Info("Deleting record from %s.%s", schema, entity)
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model, err := h.registry.GetModelByEntity(schema, entity)
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if err != nil {
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logger.Error("Invalid entity: %v", err)
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h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
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return
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}
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tableName := h.getTableName(schema, entity, model)
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query := h.db.NewDelete().Table(tableName)
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if id == "" {
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h.sendError(w, http.StatusBadRequest, "missing_id", "ID is required for delete", nil)
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return
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}
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query = query.Where("id = ?", id)
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result, err := query.Exec(ctx)
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if err != nil {
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logger.Error("Error deleting record: %v", err)
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h.sendError(w, http.StatusInternalServerError, "delete_error", "Error deleting record", err)
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return
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}
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h.sendResponse(w, map[string]interface{}{
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"deleted": result.RowsAffected(),
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}, nil)
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}
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func (h *Handler) applyFilter(query common.SelectQuery, filter common.FilterOption) common.SelectQuery {
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switch strings.ToLower(filter.Operator) {
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case "eq", "equals":
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return query.Where(fmt.Sprintf("%s = ?", filter.Column), filter.Value)
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case "neq", "not_equals", "ne":
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return query.Where(fmt.Sprintf("%s != ?", filter.Column), filter.Value)
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case "gt", "greater_than":
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return query.Where(fmt.Sprintf("%s > ?", filter.Column), filter.Value)
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case "gte", "greater_than_equals", "ge":
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return query.Where(fmt.Sprintf("%s >= ?", filter.Column), filter.Value)
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case "lt", "less_than":
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return query.Where(fmt.Sprintf("%s < ?", filter.Column), filter.Value)
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case "lte", "less_than_equals", "le":
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return query.Where(fmt.Sprintf("%s <= ?", filter.Column), filter.Value)
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case "like":
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return query.Where(fmt.Sprintf("%s LIKE ?", filter.Column), filter.Value)
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case "ilike":
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// Use ILIKE for case-insensitive search (PostgreSQL)
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// For other databases, cast to citext or use LOWER()
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return query.Where(fmt.Sprintf("CAST(%s AS TEXT) ILIKE ?", filter.Column), filter.Value)
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case "in":
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return query.Where(fmt.Sprintf("%s IN (?)", filter.Column), filter.Value)
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case "between":
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// Handle between operator - exclusive (> val1 AND < val2)
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if values, ok := filter.Value.([]interface{}); ok && len(values) == 2 {
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return query.Where(fmt.Sprintf("%s > ? AND %s < ?", filter.Column, filter.Column), values[0], values[1])
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} else if values, ok := filter.Value.([]string); ok && len(values) == 2 {
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return query.Where(fmt.Sprintf("%s > ? AND %s < ?", filter.Column, filter.Column), values[0], values[1])
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}
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logger.Warn("Invalid BETWEEN filter value format")
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return query
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case "between_inclusive":
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// Handle between inclusive operator - inclusive (>= val1 AND <= val2)
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if values, ok := filter.Value.([]interface{}); ok && len(values) == 2 {
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return query.Where(fmt.Sprintf("%s >= ? AND %s <= ?", filter.Column, filter.Column), values[0], values[1])
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} else if values, ok := filter.Value.([]string); ok && len(values) == 2 {
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return query.Where(fmt.Sprintf("%s >= ? AND %s <= ?", filter.Column, filter.Column), values[0], values[1])
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}
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logger.Warn("Invalid BETWEEN INCLUSIVE filter value format")
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return query
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case "is_null", "isnull":
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// Check for NULL values
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return query.Where(fmt.Sprintf("(%s IS NULL OR %s = '')", filter.Column, filter.Column))
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case "is_not_null", "isnotnull":
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// Check for NOT NULL values
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return query.Where(fmt.Sprintf("(%s IS NOT NULL AND %s != '')", filter.Column, filter.Column))
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default:
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logger.Warn("Unknown filter operator: %s, defaulting to equals", filter.Operator)
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return query.Where(fmt.Sprintf("%s = ?", filter.Column), filter.Value)
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}
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}
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func (h *Handler) getTableName(schema, entity string, model interface{}) string {
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// Check if model implements TableNameProvider
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if provider, ok := model.(common.TableNameProvider); ok {
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tableName := provider.TableName()
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if tableName != "" {
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return tableName
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}
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}
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// Default to schema.entity
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if schema != "" {
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return fmt.Sprintf("%s.%s", schema, entity)
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}
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return entity
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}
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func (h *Handler) generateMetadata(schema, entity string, model interface{}) *common.TableMetadata {
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modelType := reflect.TypeOf(model)
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if modelType.Kind() == reflect.Ptr {
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modelType = modelType.Elem()
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}
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tableName := h.getTableName(schema, entity, model)
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metadata := &common.TableMetadata{
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Schema: schema,
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Table: tableName,
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Columns: []common.Column{},
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}
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for i := 0; i < modelType.NumField(); i++ {
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field := modelType.Field(i)
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// Get column name from gorm tag or json tag
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columnName := field.Tag.Get("gorm")
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if strings.Contains(columnName, "column:") {
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parts := strings.Split(columnName, ";")
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for _, part := range parts {
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if strings.HasPrefix(part, "column:") {
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|
columnName = strings.TrimPrefix(part, "column:")
|
|
break
|
|
}
|
|
}
|
|
} else {
|
|
columnName = field.Tag.Get("json")
|
|
if columnName == "" || columnName == "-" {
|
|
columnName = strings.ToLower(field.Name)
|
|
}
|
|
}
|
|
|
|
// Check for primary key and unique constraint
|
|
gormTag := field.Tag.Get("gorm")
|
|
|
|
column := common.Column{
|
|
Name: columnName,
|
|
Type: h.getColumnType(field.Type),
|
|
IsNullable: h.isNullable(field),
|
|
IsPrimary: strings.Contains(gormTag, "primaryKey") || strings.Contains(gormTag, "primary_key"),
|
|
IsUnique: strings.Contains(gormTag, "unique"),
|
|
HasIndex: strings.Contains(gormTag, "index"),
|
|
}
|
|
|
|
metadata.Columns = append(metadata.Columns, column)
|
|
}
|
|
|
|
return metadata
|
|
}
|
|
|
|
func (h *Handler) getColumnType(t reflect.Type) string {
|
|
switch t.Kind() {
|
|
case reflect.String:
|
|
return "string"
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
return "integer"
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
|
return "integer"
|
|
case reflect.Float32, reflect.Float64:
|
|
return "float"
|
|
case reflect.Bool:
|
|
return "boolean"
|
|
case reflect.Ptr:
|
|
return h.getColumnType(t.Elem())
|
|
default:
|
|
return "unknown"
|
|
}
|
|
}
|
|
|
|
func (h *Handler) isNullable(field reflect.StructField) bool {
|
|
return field.Type.Kind() == reflect.Ptr
|
|
}
|
|
|
|
func (h *Handler) sendResponse(w common.ResponseWriter, data interface{}, metadata *common.Metadata) {
|
|
response := common.Response{
|
|
Success: true,
|
|
Data: data,
|
|
Metadata: metadata,
|
|
}
|
|
w.WriteHeader(http.StatusOK)
|
|
w.WriteJSON(response)
|
|
}
|
|
|
|
// sendFormattedResponse sends response with formatting options
|
|
func (h *Handler) sendFormattedResponse(w common.ResponseWriter, data interface{}, metadata *common.Metadata, options ExtendedRequestOptions) {
|
|
// Clean JSON if requested (remove null/empty fields)
|
|
if options.CleanJSON {
|
|
data = h.cleanJSON(data)
|
|
}
|
|
|
|
// Format response based on response format option
|
|
switch options.ResponseFormat {
|
|
case "simple":
|
|
// Simple format: just return the data array
|
|
w.WriteHeader(http.StatusOK)
|
|
w.WriteJSON(data)
|
|
case "syncfusion":
|
|
// Syncfusion format: { result: data, count: total }
|
|
response := map[string]interface{}{
|
|
"result": data,
|
|
}
|
|
if metadata != nil {
|
|
response["count"] = metadata.Total
|
|
}
|
|
w.WriteHeader(http.StatusOK)
|
|
w.WriteJSON(response)
|
|
default:
|
|
// Default/detail format: standard response with metadata
|
|
response := common.Response{
|
|
Success: true,
|
|
Data: data,
|
|
Metadata: metadata,
|
|
}
|
|
w.WriteHeader(http.StatusOK)
|
|
w.WriteJSON(response)
|
|
}
|
|
}
|
|
|
|
// cleanJSON removes null and empty fields from the response
|
|
func (h *Handler) cleanJSON(data interface{}) interface{} {
|
|
// This is a simplified implementation
|
|
// A full implementation would recursively clean nested structures
|
|
// For now, we'll return the data as-is
|
|
// TODO: Implement recursive cleaning
|
|
return data
|
|
}
|
|
|
|
func (h *Handler) sendError(w common.ResponseWriter, statusCode int, code, message string, err error) {
|
|
var details string
|
|
if err != nil {
|
|
details = err.Error()
|
|
}
|
|
|
|
response := common.Response{
|
|
Success: false,
|
|
Error: &common.APIError{
|
|
Code: code,
|
|
Message: message,
|
|
Details: details,
|
|
},
|
|
}
|
|
w.WriteHeader(statusCode)
|
|
w.WriteJSON(response)
|
|
}
|