backend-service-patterns

Backend Service Patterns - Go/Echo/pgx for laneweaverTMS

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Backend Service Patterns - Go/Echo/pgx for laneweaverTMS

When to Use This Skill

  • Implementing new API endpoints (handlers)

  • Adding business logic (services)

  • Writing database queries (repositories)

  • Creating models and DTOs

  • Handling transactions

  • Building complex filters with QueryBuilder

  • Adding validation logic

  • Documenting APIs with OpenAPI 3.0 / Swagger annotations

Layered Architecture

HTTP Request → Handler → Service → Repository → PostgreSQL ↓ ↓ ↓ Bind/JSON Business SQL/pgx Validate Logic Transaction ↓ ↓ ↓ HTTP Response ← Handler ← Service ← Repository

Layer Responsibilities:

  • Handler (/internal/handlers/ ): HTTP request/response, Echo context, bind JSON, return APIResponse

  • Service (/internal/services/ ): Business logic, validation, orchestration, coordinate repos

  • Repository (/internal/repository/ ): SQL queries, transactions, pgx operations

  • Models (/internal/models/ ): Structs with db/json tags, enums, request/response DTOs

Handler Patterns

Handler Struct with Dependency Injection

type LoadHandler struct { service *services.LoadService }

func NewLoadHandler(service *services.LoadService) *LoadHandler { return &LoadHandler{service: service} }

Create Handler (POST)

func (h *LoadHandler) Create(c echo.Context) error { var req models.CreateLoadRequest if err := c.Bind(&req); err != nil { return c.JSON(http.StatusBadRequest, models.APIResponse{ Success: false, Message: "Invalid request body", Errors: map[string][]string{"body": {"Failed to parse JSON"}}, }) }

result, err := h.service.CreateLoad(c.Request().Context(), &req)
if err != nil {
    // Validation errors → 400
    if validationErrors, ok := err.(models.ValidationErrors); ok {
        return c.JSON(http.StatusBadRequest, models.APIResponse{
            Success: false,
            Message: "Validation failed",
            Errors:  validationErrors.ToMap(),
        })
    }
    // Operational errors → 500
    c.Logger().Error("CreateLoad error:", err)
    return c.JSON(http.StatusInternalServerError, models.APIResponse{
        Success: false,
        Message: "Failed to create load",
    })
}

return c.JSON(http.StatusCreated, models.APIResponse{
    Success: true,
    Message: "Load created successfully",
    Data:    result,
})

}

List Handler with Filters (GET)

func (h *LoadHandler) List(c echo.Context) error { filters := parseLoadFilters(c)

items, total, err := h.service.ListLoads(c.Request().Context(), filters)
if err != nil {
    return c.JSON(http.StatusInternalServerError, models.APIResponse{
        Success: false,
        Message: "Failed to fetch loads",
    })
}

response := models.NewPaginatedResponse(items, total, filters.Page, filters.PageSize)
return c.JSON(http.StatusOK, models.APIResponse{
    Success: true,
    Data:    response,
})

}

Query Parameter Parsing (Nil Pointer Helpers)

func parseLoadFilters(c echo.Context) models.LoadFilters { var filters models.LoadFilters

// Multi-select (comma-separated)
if loadStatus := c.QueryParam("load_status"); loadStatus != "" {
    filters.LoadStatus = strings.Split(loadStatus, ",")
}

// Optional string
filters.AccountID = parseStringPtr(c.QueryParam("account_id"))

// Date range
filters.PickupDateFrom = parseDatePtr(c.QueryParam("pickup_date_from"))
filters.PickupDateTo = parseDatePtr(c.QueryParam("pickup_date_to"))

// Pagination with defaults
filters.Page = 1
if page := c.QueryParam("page"); page != "" {
    if p, err := strconv.Atoi(page); err == nil && p > 0 {
        filters.Page = p
    }
}
filters.PageSize = 50
if pageSize := c.QueryParam("page_size"); pageSize != "" {
    if ps, err := strconv.Atoi(pageSize); err == nil && ps > 0 && ps <= 100 {
        filters.PageSize = ps
    }
}

return filters

}

// Helper functions for safe type conversion func parseStringPtr(s string) *string { if s == "" { return nil } return &s }

func parseDatePtr(s string) *time.Time { if s == "" { return nil } t, err := time.Parse("2006-01-02", s) if err != nil { return nil } return &t }

func parseFloatPtr(s string) *float64 { if s == "" { return nil } f, err := strconv.ParseFloat(s, 64) if err != nil { return nil } return &f }

func parseBoolPtr(s string) *bool { if s == "" { return nil } b, err := strconv.ParseBool(s) if err != nil { return nil } return &b }

GetByID Handler

func (h *LoadHandler) GetByID(c echo.Context) error { id := c.Param("id")

load, err := h.service.GetLoadByID(c.Request().Context(), id)
if err != nil {
    return c.JSON(http.StatusInternalServerError, models.APIResponse{
        Success: false,
        Message: "Failed to fetch load",
    })
}
if load == nil {
    return c.JSON(http.StatusNotFound, models.APIResponse{
        Success: false,
        Message: "Load not found",
    })
}

return c.JSON(http.StatusOK, models.APIResponse{
    Success: true,
    Data:    load,
})

}

Service Patterns

Service Struct with Multiple Repositories

type LoadService struct { loadRepo *repository.LoadRepository facilityRepo *repository.FacilityRepository accountRepo *repository.AccountRepository }

func NewLoadService( loadRepo *repository.LoadRepository, facilityRepo *repository.FacilityRepository, accountRepo *repository.AccountRepository, ) *LoadService { return &LoadService{ loadRepo: loadRepo, facilityRepo: facilityRepo, accountRepo: accountRepo, } }

Create Method with Validation

func (s *LoadService) CreateLoad(ctx context.Context, req *models.CreateLoadRequest) (*models.CreateLoadResponse, error) { // 1. Validate request (delegated to models) if errors := models.ValidateCreateLoadRequest(req); len(errors) > 0 { return nil, errors }

// 2. Business logic (find-or-create facilities, generate IDs, etc.)
stopParams, err := s.resolveStopFacilities(ctx, req.Stops)
if err != nil {
    return nil, err
}

// 3. Build entity
load := &models.Load{
    ID:           uuid.New().String(),
    LoadNumber:   s.generateLoadNumber(ctx),
    TenderID:     req.TenderID,
    LoadStatus:   models.LoadStatusUncovered,
    Mode:         &req.Mode,
    CustomerRate: &req.CustomerRate,
}

// 4. Call repository
createParams := repository.CreateLoadParams{Load: load, Stops: stopParams}
if err := s.loadRepo.CreateWithStops(ctx, createParams); err != nil {
    return nil, fmt.Errorf("failed to create load: %w", err)
}

// 5. Build response
return &models.CreateLoadResponse{
    ID:         load.ID,
    LoadNumber: load.LoadNumber,
    LoadStatus: load.LoadStatus,
}, nil

}

Retry Logic for Race Conditions

const maxRetries = 3

func (s *LoadService) CreateLoadWithRetry(ctx context.Context, req *models.CreateLoadRequest) (*models.Load, error) { var lastErr error for attempt := 0; attempt < maxRetries; attempt++ { loadNumber, err := s.generateLoadNumber(ctx) if err != nil { return nil, err }

    load := &#x26;models.Load{
        ID:         uuid.New().String(),
        LoadNumber: loadNumber,
        // ...
    }

    err = s.loadRepo.Create(ctx, load)
    if err != nil {
        // Retry on unique constraint violation
        if strings.Contains(err.Error(), "duplicate key") ||
            strings.Contains(err.Error(), "loads_load_number_key") {
            lastErr = err
            continue
        }
        return nil, err
    }
    return load, nil
}
return nil, fmt.Errorf("failed after %d retries: %w", maxRetries, lastErr)

}

Repository Patterns

Repository Struct

type LoadRepository struct { db *database.Client }

func NewLoadRepository(db *database.Client) *LoadRepository { return &LoadRepository{db: db} }

Transaction Pattern

func (r *LoadRepository) CreateWithStops(ctx context.Context, params CreateLoadParams) error { tx, err := r.db.Begin(ctx) if err != nil { return fmt.Errorf("failed to begin transaction: %w", err) } defer tx.Rollback(ctx)

// Insert load
loadQuery := `
    INSERT INTO loads (id, load_number, tender_id, load_status, mode, customer_rate, created_at, updated_at)
    VALUES ($1, $2, $3, $4, $5, $6, NOW(), NOW())
`
_, err = tx.Exec(ctx, loadQuery,
    params.Load.ID,
    params.Load.LoadNumber,
    params.Load.TenderID,
    params.Load.LoadStatus,
    params.Load.Mode,
    params.Load.CustomerRate,
)
if err != nil {
    return fmt.Errorf("failed to insert load: %w", err)
}

// Insert stops
stopQuery := `
    INSERT INTO stops (id, load_id, facility_id, stop_sequence, stop_type, scheduled_date, created_at, updated_at)
    VALUES ($1, $2, $3, $4, $5, $6, NOW(), NOW())
`
for _, stop := range params.Stops {
    _, err = tx.Exec(ctx, stopQuery,
        stop.ID, params.Load.ID, stop.FacilityID, stop.StopSequence, stop.StopType, stop.ScheduledDate,
    )
    if err != nil {
        return fmt.Errorf("failed to insert stop %d: %w", stop.StopSequence, err)
    }
}

if err = tx.Commit(ctx); err != nil {
    return fmt.Errorf("failed to commit: %w", err)
}
return nil

}

GetByID with Not Found Handling

func (r *LoadRepository) GetByID(ctx context.Context, id string) (*models.Load, error) { query := SELECT id, load_number, tender_id, load_status, mode, customer_rate, created_at, updated_at FROM loads WHERE id = $1 AND deleted_at IS NULL var load models.Load err := r.db.QueryRow(ctx, query, id).Scan( &load.ID, &load.LoadNumber, &load.TenderID, &load.LoadStatus, &load.Mode, &load.CustomerRate, &load.CreatedAt, &load.UpdatedAt, ) if err != nil { if errors.Is(err, pgx.ErrNoRows) { return nil, nil // Not found } return nil, err } return &load, nil }

QueryBuilder for Complex Filters

func buildLoadListQuery(filters models.LoadFilters) (string, []interface{}) { qb := NewQueryBuilder()

// Multi-select IN conditions
qb.AddInCondition("l.load_status", filters.LoadStatus)
qb.AddInCondition("l.mode", filters.Mode)

// Single value conditions
if filters.AccountID != nil {
    qb.AddCondition("t.account_id = $%d", *filters.AccountID)
}
if filters.CarrierID != nil {
    qb.AddCondition("l.carrier_id = $%d", *filters.CarrierID)
}

// Date ranges
if filters.PickupDateFrom != nil {
    qb.AddCondition("t.pickup_date >= $%d", *filters.PickupDateFrom)
}
if filters.PickupDateTo != nil {
    qb.AddCondition("t.pickup_date &#x3C;= $%d", *filters.PickupDateTo)
}

// Boolean filters
if filters.IsCancelled != nil {
    qb.AddCondition("l.is_cancelled = $%d", *filters.IsCancelled)
}

// Text search
if filters.Search != nil &#x26;&#x26; *filters.Search != "" {
    qb.AddOrCondition([]string{"l.load_number", "a.name"}, "%"+*filters.Search+"%")
}

whereClause, args := qb.Build()

// Sort column whitelist
sortColumn := "l.created_at"
sortColumnMap := map[string]string{
    "load_number": "l.load_number",
    "created_at":  "l.created_at",
    "pickup_date": "t.pickup_date",
}
if col, ok := sortColumnMap[filters.SortBy]; ok {
    sortColumn = col
}

sortDir := "DESC"
if filters.SortDir == "asc" {
    sortDir = "ASC"
}

offset := (filters.Page - 1) * filters.PageSize
argIdx := qb.ArgCount()

baseQuery := `
    SELECT l.id, l.load_number, l.load_status, l.customer_rate, a.name as account_name
    FROM loads l
    JOIN tenders t ON l.tender_id = t.id
    LEFT JOIN accounts a ON t.account_id = a.id
    WHERE l.deleted_at IS NULL
` + whereClause

query := fmt.Sprintf("%s ORDER BY %s %s LIMIT $%d OFFSET $%d",
    baseQuery, sortColumn, sortDir, argIdx+1, argIdx+2)
args = append(args, filters.PageSize, offset)

return query, args

}

Find-or-Create Pattern

func (r *FacilityRepository) FindOrCreate(ctx context.Context, addr *models.FacilityAddress) (*models.Facility, error) { // Try to find existing existing, err := r.FindByAddress(ctx, addr.Address, addr.City, addr.State, addr.Zip) if err != nil { return nil, err } if existing != nil { return existing, nil }

// Create new
facility := &#x26;models.Facility{
    ID:      uuid.New().String(),
    Name:    fmt.Sprintf("%s, %s", addr.City, addr.State),
    Address: addr.Address,
    City:    addr.City,
    State:   strings.ToUpper(addr.State),
    Zip:     addr.Zip,
    Country: "USA",
}
if err := r.Create(ctx, facility); err != nil {
    return nil, err
}
return facility, nil

}

Model Patterns

Entity Struct with Tags

type Load struct { ID string db:"id" json:"id" LoadNumber string db:"load_number" json:"loadNumber" TenderID string db:"tender_id" json:"tenderId" CarrierID *string db:"carrier_id" json:"carrierId,omitempty" LoadStatus LoadStatus db:"load_status" json:"loadStatus" Mode *ModeOfTransport db:"mode" json:"mode,omitempty" CustomerRate *float64 db:"customer_rate" json:"customerRate,omitempty" CarrierRate *float64 db:"carrier_rate" json:"carrierRate,omitempty" IsCancelled bool db:"is_cancelled" json:"isCancelled"

// Audit fields
CreatedAt time.Time  `db:"created_at" json:"createdAt"`
UpdatedAt time.Time  `db:"updated_at" json:"updatedAt"`
CreatedBy *int32     `db:"created_by" json:"createdBy,omitempty"`
UpdatedBy *int32     `db:"updated_by" json:"updatedBy,omitempty"`
DeletedAt *time.Time `db:"deleted_at" json:"deletedAt,omitempty"`

}

Tag Conventions:

  • db:"column_name"

  • Maps to PostgreSQL column (snake_case)

  • json:"fieldName"

  • Maps to JSON field (camelCase for API)

  • json:"...,omitempty"

  • Omits null/zero values from response

  • Required fields: string , float64 , time.Time

  • Optional fields: *string , *float64 , *time.Time

Enum Definition with Validation

type LoadStatus string

const ( LoadStatusUncovered LoadStatus = "uncovered" LoadStatusAssigned LoadStatus = "assigned" LoadStatusDispatched LoadStatus = "dispatched" LoadStatusAtOrigin LoadStatus = "at_origin" LoadStatusInTransit LoadStatus = "in_transit" LoadStatusAtDestination LoadStatus = "at_destination" LoadStatusDelivered LoadStatus = "delivered" )

func (s LoadStatus) IsValid() bool { switch s { case LoadStatusUncovered, LoadStatusAssigned, LoadStatusDispatched, LoadStatusAtOrigin, LoadStatusInTransit, LoadStatusAtDestination, LoadStatusDelivered: return true } return false }

type ModeOfTransport string

const ( ModeDryVan ModeOfTransport = "Dry Van" ModeRefrigeratedVan ModeOfTransport = "Refrigerated Van" ModeFlatbed ModeOfTransport = "Flatbed" )

func (m ModeOfTransport) IsTempControlled() bool { return m == ModeRefrigeratedVan }

Request DTO

type CreateLoadRequest struct { TenderID string json:"tenderId" validate:"required" Mode ModeOfTransport json:"mode" validate:"required" CustomerRate float64 json:"customerRate" validate:"required,gt=0" CarrierRate *float64 json:"carrierRate,omitempty" validate:"omitempty,gt=0" Temperature *float64 json:"temperature,omitempty" Stops []CreateStopRequest json:"stops" validate:"required,min=2" }

Validation Function

func ValidateCreateLoadRequest(req *CreateLoadRequest) ValidationErrors { var errors ValidationErrors

if req.TenderID == "" {
    errors = append(errors, ValidationError{
        Field:   "tenderId",
        Message: "Tender ID is required",
    })
}

if !req.Mode.IsValid() {
    errors = append(errors, ValidationError{
        Field:   "mode",
        Message: "Invalid mode of transport",
    })
}

// Conditional validation
if req.Mode.IsTempControlled() &#x26;&#x26; req.Temperature == nil {
    errors = append(errors, ValidationError{
        Field:   "temperature",
        Message: fmt.Sprintf("Temperature is required for %s mode", req.Mode),
    })
}

if len(req.Stops) &#x3C; 2 {
    errors = append(errors, ValidationError{
        Field:   "stops",
        Message: "At least 2 stops are required (pickup and delivery)",
    })
}

return errors

}

Response & Error Patterns

APIResponse Wrapper

type APIResponse struct { Success bool json:"success" Message string json:"message,omitempty" Data interface{} json:"data,omitempty" Errors map[string][]string json:"errors,omitempty" }

PaginatedResponse Generic

type PaginatedResponse[T any] struct { Data []T json:"data" Total int json:"total" Page int json:"page" PageSize int json:"pageSize" TotalPages int json:"totalPages" }

func NewPaginatedResponse[T any](items []T, total, page, pageSize int) PaginatedResponse[T] { totalPages := 0 if total > 0 && pageSize > 0 { totalPages = (total + pageSize - 1) / pageSize } return PaginatedResponse[T]{ Data: items, Total: total, Page: page, PageSize: pageSize, TotalPages: totalPages, } }

ValidationErrors Type

type ValidationError struct { Field string json:"field" Message string json:"message" }

type ValidationErrors []ValidationError

func (v ValidationErrors) Error() string { if len(v) == 0 { return "" } return fmt.Sprintf("%d validation error(s)", len(v)) }

func (v ValidationErrors) ToMap() map[string][]string { result := make(map[string][]string) for _, err := range v { result[err.Field] = append(result[err.Field], err.Message) } return result }

Router Setup

func Setup(e *echo.Echo, loadHandler *handlers.LoadHandler, accountHandler *handlers.AccountHandler) { // Global middleware e.Use(middleware.SetupLogger()) e.Use(middleware.SetupRecover()) e.Use(middleware.SetupCORS())

// Health check
e.GET("/health", func(c echo.Context) error {
    return c.JSON(200, map[string]string{"status": "ok"})
})

// API v1 routes
api := e.Group("/api/v1")

// Loads
loads := api.Group("/loads")
loads.GET("", loadHandler.List)
loads.POST("", loadHandler.Create)
loads.GET("/:id", loadHandler.GetByID)
loads.PUT("/:id", loadHandler.Update)
loads.DELETE("/:id", loadHandler.Delete)

// Accounts
accounts := api.Group("/accounts")
accounts.GET("", accountHandler.List)
accounts.GET("/:id", accountHandler.GetByID)

}

OpenAPI 3.0 Documentation (swaggo/echo-swagger)

Installation & Setup

Install swag CLI and echo-swagger:

go install github.com/swaggo/swag/cmd/swag@latest go get github.com/swaggo/echo-swagger

Generate docs (run from project root):

swag init -g cmd/server/main.go -o docs

Register swagger middleware in router:

import ( echoSwagger "github.com/swaggo/echo-swagger" _ "yourproject/docs" // Generated docs )

func Setup(e echo.Echo, ...) { // Swagger docs endpoint e.GET("/swagger/", echoSwagger.WrapHandler)

// ... rest of routes

}

Main Package Annotations

Add to cmd/server/main.go :

// @title laneweaverTMS API // @version 1.0 // @description Transportation Management System API

// @host localhost:8080 // @BasePath /api/v1

func main() { // ... }

Handler Annotations

Create Handler (POST)

// Create godoc // @Summary Create a new load // @Description Creates a load with stops and validates required fields // @Tags loads // @Accept json // @Produce json // @Param request body models.CreateLoadRequest true "Load creation request" // @Success 201 {object} models.APIResponse{data=models.CreateLoadResponse} // @Failure 400 {object} models.APIResponse // @Failure 500 {object} models.APIResponse // @Router /loads [post] func (h *LoadHandler) Create(c echo.Context) error { // ... existing implementation }

List Handler (GET with Query Params)

// List godoc // @Summary List loads with filters // @Description Returns paginated list of loads with optional filtering // @Tags loads // @Accept json // @Produce json // @Param load_status query string false "Filter by status (comma-separated)" Example(uncovered,assigned) // @Param account_id query string false "Filter by account ID" // @Param pickup_date_from query string false "Filter pickup date from (YYYY-MM-DD)" // @Param pickup_date_to query string false "Filter pickup date to (YYYY-MM-DD)" // @Param page query int false "Page number" default(1) // @Param page_size query int false "Items per page" default(50) maximum(100) // @Param sort_by query string false "Sort column" Enums(load_number,created_at,pickup_date) // @Param sort_dir query string false "Sort direction" Enums(asc,desc) // @Success 200 {object} models.APIResponse{data=models.PaginatedResponse[models.LoadListItem]} // @Failure 500 {object} models.APIResponse // @Router /loads [get] func (h *LoadHandler) List(c echo.Context) error { // ... existing implementation }

GetByID Handler (GET with Path Param)

// GetByID godoc // @Summary Get load by ID // @Description Returns a single load with full details // @Tags loads // @Accept json // @Produce json // @Param id path string true "Load ID" // @Success 200 {object} models.APIResponse{data=models.Load} // @Failure 404 {object} models.APIResponse // @Failure 500 {object} models.APIResponse // @Router /loads/{id} [get] func (h *LoadHandler) GetByID(c echo.Context) error { // ... existing implementation }

Model Annotations

Add example tags for documentation:

type CreateLoadRequest struct { TenderID string json:"tenderId" example:"tender-123" Mode ModeOfTransport json:"mode" example:"Dry Van" CustomerRate float64 json:"customerRate" example:"1500.00" CarrierRate *float64 json:"carrierRate,omitempty" example:"1200.00" Stops []CreateStopRequest json:"stops" }

type CreateLoadResponse struct { ID string json:"id" example:"load-456" LoadNumber string json:"loadNumber" example:"LD-2024-001" LoadStatus LoadStatus json:"loadStatus" example:"uncovered" }

For enums, add a comment listing valid values:

// LoadStatus represents the current state of a load // @Description Load lifecycle status // @Enum uncovered,assigned,dispatched,at_origin,in_transit,at_destination,delivered type LoadStatus string

Regenerating Docs

Run after any annotation changes:

swag init -g cmd/server/main.go -o docs

Access docs at: http://localhost:8080/swagger/index.html

Checklist for New Endpoints

Handler: [ ] Create handler struct with service dependency [ ] Implement New*Handler constructor [ ] Bind request body with c.Bind() [ ] Use type assertion for ValidationErrors [ ] Return APIResponse wrapper for all responses [ ] Log errors only on 500s

Service: [ ] Create service struct with repository dependencies [ ] Implement New*Service constructor [ ] Call validation function at start of create/update methods [ ] Use context.Context throughout [ ] Return ValidationErrors for business rule failures

Repository: [ ] Create repository struct with database client [ ] Use parameterized queries ($1, $2) [ ] Check pgx.ErrNoRows for "not found" [ ] Include deleted_at IS NULL in queries [ ] Use transactions for multi-table operations

Models: [ ] Add db and json tags to all fields [ ] Use pointers for nullable fields [ ] Include audit fields (CreatedAt, UpdatedAt, etc.) [ ] Create request/response DTOs separate from entity

Router: [ ] Register routes in Setup function [ ] Use route groups for resource prefixes [ ] Follow RESTful conventions (GET/POST/PUT/DELETE)

OpenAPI/Swagger: [ ] Add swagger annotations to handler functions [ ] Add example tags to request/response models [ ] Run swag init after annotation changes [ ] Verify docs at /swagger/index.html

Code References

  • Handlers: /internal/handlers/load.go , /internal/handlers/account.go

  • Services: /internal/services/load.go

  • Repositories: /internal/repository/load.go , /internal/repository/query_builder.go

  • Models: /internal/models/load.go , /internal/models/validation.go , /internal/models/responses.go

  • Router: /internal/router/router.go

Additional Documentation

  • Error Handling: For comprehensive error handling patterns beyond the examples shown here, see effective-go/references/error-handling.md (error wrapping, sentinel errors, custom types, panic/recover, testing)

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