ent/entc/gen/template/client.tmpl

{{/*
Copyright 2019-present Facebook Inc. All rights reserved.
This source code is licensed under the Apache 2.0 license found
in the LICENSE file in the root directory of this source tree.
*/}}

{{/* gotype: entgo.io/ent/entc/gen.Graph */}}

{{ define "client/init" }}
// Client is the client that holds all ent builders.
type Client struct {
	config
	{{- if $.SupportMigrate }}
		// Schema is the client for creating, migrating and dropping schema.
		Schema *migrate.Schema
	{{- end }}
	{{- range $n := $.Nodes }}
		// {{ $n.Name }} is the client for interacting with the {{ $n.Name }} builders.
		{{ $n.Name }} *{{ $n.ClientName }}
	{{- end }}
	{{- template "client/fields/additional" $ }}
	{{- with $tmpls := matchTemplate "client/fields/additional/*" }}
		{{- range $tmpl := $tmpls }}
			{{- xtemplate $tmpl $ }}
		{{- end }}
	{{- end }}
}

// NewClient creates a new client configured with the given options.
func NewClient(opts ...Option) *Client {
	client := &Client{config: newConfig(opts...)}
	client.init()
	return client
}

func (c *Client) init() {
	{{- if $.SupportMigrate }}
		c.Schema = migrate.NewSchema(c.driver)
	{{- end }}
	{{- range $n := $.Nodes }}
    	c.{{ $n.Name }} = New{{ $n.ClientName }}(c.config)
	{{- end }}
}
{{ end }}

{{ define "client" }}

{{ $pkg := base $.Config.Package }}
{{ template "header" $ }}

{{/* Additional dependencies injected to config. */}}
{{ $deps := list }}{{ with $.Config.Annotations }}{{ $deps = $.Config.Annotations.Dependencies }}{{ end }}

import (
	"context"
	"log"

	"{{ $.Config.Package }}/migrate"
	{{ range $n := $.Nodes }}
		{{ $n.PackageAlias }} "{{ $n.Config.Package }}/{{ $n.PackageDir }}"
	{{- end }}
	{{- range $dep := $deps }}
		{{ $dep.Type.PkgName }} "{{ $dep.Type.PkgPath }}"
	{{- end }}
	"entgo.io/ent/dialect"
	{{ range $import := $.Storage.Imports -}}
		"{{ $import }}"
	{{ end -}}
	{{- template "import/additional" $ }}
)

{{ template "client/init" $ }}

type (
	// config is the configuration for the client and its builder.
	config struct {
		// driver used for executing database requests.
		driver dialect.Driver
		// debug enable a debug logging.
		debug bool
		// log used for logging on debug mode.
		log func(...any)
		// hooks to execute on mutations.
		hooks *hooks
		// interceptors to execute on queries.
		inters *inters
		{{- /* Additional dependency fields. */}}
		{{- range $dep := $deps }}
			{{ $dep.Field }} {{ $dep.Type }}
		{{- end }}
		{{- /* Support adding config fields from both global or dialect-specific templates. */}}
		{{- range $prefix := list "" (printf "dialect/%s/" $.Storage) }}
			{{- with $tmpls := matchTemplate (print $prefix "config/fields/*") }}
				{{- range $tmpl := $tmpls }}
					{{ xtemplate $tmpl $ }}
				{{- end }}
			{{- end }}
		{{- end }}
	}
	// Option function to configure the client.
	Option func(*config)
)

// newConfig creates a new config for the client.
func newConfig(opts ...Option) config {
	cfg := config{log: log.Println, hooks: &hooks{}, inters: &inters{}}
	{{- with $tmpls := matchTemplate "config/init/fields/*" }}
		{{- range $tmpl := $tmpls }}
			{{- xtemplate $tmpl $ }}
		{{- end }}
	{{- end }}
	cfg.options(opts...)
	return cfg
}

// options applies the options on the config object.
func (c *config) options(opts ...Option) {
	for _, opt := range opts {
		opt(c)
	}
	if c.debug {
		c.driver = dialect.Debug(c.driver, c.log)
	}
}

// Debug enables debug logging on the ent.Driver.
func Debug() Option {
	return func(c *config) {
		c.debug = true
	}
}

// Log sets the logging function for debug mode.
func Log(fn func(...any)) Option {
	return func(c *config) {
		c.log = fn
	}
}

// Driver configures the client driver.
func Driver(driver dialect.Driver) Option {
	return func(c *config) {
		c.driver = driver
	}
}

{{- /* Additional dependency options reside on the config object. */}}
{{- range $dep := $deps }}
	// {{ $dep.Option }} configures the {{ $dep.Field }}.
	func {{ $dep.Option }}(v {{ $dep.Type }}) Option {
		return func(c *config) {
			c.{{ $dep.Field }} = v
		}
	}
{{- end }}

// Open opens a database/sql.DB specified by the driver name and
// the data source name, and returns a new client attached to it.
// Optional parameters can be added for configuring the client.
func Open(driverName, dataSourceName string, options ...Option) (*Client, error) {
	switch driverName {
	case {{ join $.Storage.Dialects ", " }}:
		{{- $tmpl := printf "dialect/%s/client/open" $.Storage -}}
		{{- xtemplate $tmpl . -}}
	default:
		return nil, fmt.Errorf("unsupported driver: %q", driverName)
	}
}

// ErrTxStarted is returned when trying to start a new transaction from a transactional client.
var ErrTxStarted = errors.New("{{ $pkg }}: cannot start a transaction within a transaction")

// Tx returns a new transactional client. The provided context
// is used until the transaction is committed or rolled back.
func (c *Client) Tx(ctx context.Context) (*Tx, error) {
	if _, ok := c.driver.(*txDriver); ok {
		return nil, ErrTxStarted
	}
	tx, err := newTx(ctx, c.driver)
	if err != nil {
		return nil, fmt.Errorf("{{ $pkg }}: starting a transaction: %w", err)
	}
	cfg := c.config
	cfg.driver = tx
	return &Tx{
		ctx: ctx,
		config: cfg,
		{{- range $n := $.Nodes }}
			{{ $n.Name }}: New{{ $n.ClientName }}(cfg),
		{{- end }}
	}, nil
}

{{- /* If the storage driver supports TxOptions (like SQL) */}}
{{- $tmpl = printf "dialect/%s/txoptions" $.Storage }}
{{- if hasTemplate $tmpl }}
    {{- xtemplate $tmpl . }}
{{- end }}

// Debug returns a new debug-client. It's used to get verbose logging on specific operations.
//
//	client.Debug().
//		{{ (index $.Nodes 0).Name }}.
//		Query().
//		Count(ctx)
//
func (c *Client) Debug() *Client {
	if c.debug {
		return c
	}
	cfg := c.config
	cfg.driver = dialect.Debug(c.driver, c.log)
	client := &Client{config: cfg}
	client.init()
	return client
}

// Close closes the database connection and prevents new queries from starting.
func (c *Client) Close() error {
	return c.driver.Close()
}

// Use adds the mutation hooks to all the entity clients.
// In order to add hooks to a specific client, call: `client.Node.Use(...)`.
func (c *Client) Use(hooks ...Hook) {
	{{- if lt (len $.Nodes) 6 }}
		{{- range $n := $.MutableNodes }}
			c.{{ $n.Name }}.Use(hooks...)
		{{- end }}
	{{- /* Use a for-loop for setting hooks in case there are too many nodes. */}}
	{{- else }}
		{{- $hooks := slist }}
		{{- range $n := $.MutableNodes }}{{ $hooks = append $hooks (printf "c.%s," $n.Name) }}{{ end }}
		for _, n := range []interface{ Use(...Hook) }{
			{{ joinWords $hooks 80 }}
		}{
			n.Use(hooks...)
		}
	{{- end }}
}

// Intercept adds the query interceptors to all the entity clients.
// In order to add interceptors to a specific client, call: `client.Node.Intercept(...)`.
func (c *Client) Intercept(interceptors ...Interceptor) {
	{{- if lt (len $.Nodes) 6 }}
		{{- range $n := $.Nodes }}
			c.{{ $n.Name }}.Intercept(interceptors...)
		{{- end }}
	{{- /* Use a for-loop for setting interceptors in case there are too many nodes. */}}
	{{- else }}
		{{- $inters := slist }}
		{{- range $n := $.Nodes }}{{ $inters = append $inters (printf "c.%s," $n.Name) }}{{ end }}
		for _, n := range []interface{ Intercept(...Interceptor) }{
			{{ joinWords $inters 80 }}
		}{
			n.Intercept(interceptors...)
		}
	{{- end }}
}

{{- with $tmpls := matchTemplate "client/additional/*" "client/additional/*/*" }}
	{{- range $tmpl := $tmpls }}
		{{- xtemplate $tmpl $ }}
	{{- end }}
{{- end }}


// Mutate implements the ent.Mutator interface.
func (c *Client) Mutate(ctx context.Context, m Mutation) (Value, error) {
	switch m := m.(type) {
	{{- range $n := $.MutableNodes }}
		case *{{ $n.MutationName }}:
			return c.{{ $n.Name }}.mutate(ctx, m)
	{{- end }}
	default:
		return nil, fmt.Errorf("{{ $pkg }}: unknown mutation type %T", m)
	}
}

{{ range $n := $.Nodes }}
{{ $client := $n.ClientName }}
// {{ $client }} is a client for the {{ $n.Name }} schema.
type {{ $client }} struct {
	config
}

// New{{ $client }} returns a client for the {{ $n.Name }} from the given config.
func New{{ $client }}(c config) *{{ $client }} {
	return &{{ $client }}{config: c}
}

{{- if not $n.IsView }}
// Use adds a list of mutation hooks to the hooks stack.
// A call to `Use(f, g, h)` equals to `{{ $n.Package }}.Hooks(f(g(h())))`.
func (c *{{ $client }}) Use(hooks ...Hook) {
	c.hooks.{{ $n.Name }} = append(c.hooks.{{ $n.Name }}, hooks...)
}
{{- end }}

// Intercept adds a list of query interceptors to the interceptors stack.
// A call to `Intercept(f, g, h)` equals to `{{ $n.Package }}.Intercept(f(g(h())))`.
func (c *{{ $client }}) Intercept(interceptors ...Interceptor) {
	c.inters.{{ $n.Name }} = append(c.inters.{{ $n.Name }}, interceptors...)
}

{{- if not $n.IsView }}
// Create returns a builder for creating a {{ $n.Name }} entity.
func (c *{{ $client }}) Create() *{{ $n.CreateName }} {
	mutation := new{{ $n.MutationName }}(c.config, OpCreate)
	return &{{ $n.CreateName }}{config: c.config, hooks: c.Hooks(), mutation: mutation}
}

// CreateBulk returns a builder for creating a bulk of {{ $n.Name }} entities.
func (c *{{ $client }}) CreateBulk(builders ...*{{ $n.CreateName }}) *{{ $n.CreateBulkName }} {
	return &{{ $n.CreateBulkName }}{config: c.config, builders: builders}
}

// MapCreateBulk creates a bulk creation builder from the given slice. For each item in the slice, the function creates
// a builder and applies setFunc on it.
func (c *{{ $client }}) MapCreateBulk(slice any, setFunc func(*{{ $n.CreateName }}, int)) *{{ $n.CreateBulkName }} {
	{{- /* This check should be replaced with type-parameter method, if it will be supported by Go. */}}
	rv := reflect.ValueOf(slice)
	if rv.Kind() != reflect.Slice {
		return &{{ $n.CreateBulkName }}{err: fmt.Errorf("calling to {{ $client }}.MapCreateBulk with wrong type %T, need slice", slice)}
	}
	builders := make([]*{{ $n.CreateName }}, rv.Len())
	for i := 0; i < rv.Len(); i++ {
		builders[i] = c.Create()
		setFunc(builders[i], i)
	}
	return &{{ $n.CreateBulkName }}{config: c.config, builders: builders}
}

// Update returns an update builder for {{ $n.Name }}.
func (c *{{ $client }}) Update() *{{ $n.UpdateName }} {
	mutation := new{{ $n.MutationName }}(c.config, OpUpdate)
	return &{{ $n.UpdateName }}{config: c.config, hooks: c.Hooks(), mutation: mutation}
}

// UpdateOne returns an update builder for the given entity.
func (c *{{ $client }}) UpdateOne(m *{{ $n.Name }}) *{{ $n.UpdateOneName }} {
	{{- if $n.HasOneFieldID }}
		mutation := new{{ $n.MutationName }}(c.config, OpUpdateOne, {{ print "with" $n.Name }}(m))
	{{- else }}
		mutation := new{{ $n.MutationName }}(c.config, OpUpdateOne)
		{{- range $id := $n.EdgeSchema.ID }}
			mutation.{{ $id.BuilderField }} = &m.{{ $id.StructField }}
		{{- end }}
	{{- end }}
	return &{{ $n.UpdateOneName }}{config: c.config, hooks: c.Hooks(), mutation: mutation}
}

{{ with $n.HasOneFieldID }}
	// UpdateOneID returns an update builder for the given id.
	func (c *{{ $client }}) UpdateOneID(id {{ $n.ID.Type }}) *{{ $n.UpdateOneName }} {
		mutation := new{{ $n.MutationName }}(c.config, OpUpdateOne, {{ print "with" $n.Name "ID" }}(id))
		return &{{ $n.UpdateOneName }}{config: c.config, hooks: c.Hooks(), mutation: mutation}
	}
{{ end }}

// Delete returns a delete builder for {{ $n.Name }}.
func (c *{{ $client }}) Delete() *{{ $n.DeleteName }} {
	mutation := new{{ $n.MutationName }}(c.config, OpDelete)
	return &{{ $n.DeleteName }}{config: c.config, hooks: c.Hooks(), mutation: mutation}
}

{{ with $n.HasOneFieldID }}
	// DeleteOne returns a builder for deleting the given entity.
	func (c *{{ $client }}) DeleteOne(m *{{ $n.Name }}) *{{ $n.DeleteOneName }} {
		return c.DeleteOneID(m.ID)
	}

	// DeleteOneID returns a builder for deleting the given entity by its id.
	func (c *{{ $client }}) DeleteOneID(id {{ $n.ID.Type }}) *{{ $n.DeleteOneName }} {
		{{- $builder := "builder" }}{{ if eq $n.Package $builder }}{{ $builder = "builderC" }}{{ end }}
		{{ $builder }} := c.Delete().Where({{ $n.Package }}.ID(id))
		{{ $builder }}.mutation.id = &id
		{{ $builder }}.mutation.op = OpDeleteOne
		return &{{ $n.DeleteOneName }}{ {{ $builder }} }
	}
{{ end }}
{{- end }} {{/* End of if not IsView. */}}

// Query returns a query builder for {{ $n.Name }}.
func (c *{{ $client }}) Query() *{{ $n.QueryName }} {
	return &{{ $n.QueryName }}{
		config: c.config,
		ctx: &QueryContext{Type: {{ $n.TypeName }} },
		inters: c.Interceptors(),
		{{- with $tmpls := matchTemplate (printf "dialect/%s/query/fields/init/*" $.Storage) }}
			{{- range $tmpl := $tmpls }}
				{{- xtemplate $tmpl $n }}
			{{- end }}
		{{- end }}
	}
}

{{ with $n.HasOneFieldID }}
	// Get returns a {{ $n.Name }} entity by its id.
	func (c *{{ $client }}) Get(ctx context.Context, id {{ $n.ID.Type }}) (*{{ $n.Name }}, error) {
		return c.Query().Where({{ $n.Package }}.ID(id)).Only(ctx)
	}

	// GetX is like Get, but panics if an error occurs.
	func (c *{{ $client }}) GetX(ctx context.Context, id {{ $n.ID.Type }}) *{{ $n.Name }} {
		obj, err := c.Get(ctx, id)
		if err != nil {
			panic(err)
		}
		return obj
	}
{{ end }}

{{ range $e := $n.Edges }}
{{ $builder := $e.Type.QueryName }}
{{ $func := print "Query" (pascal $e.Name) }}
// Query{{ pascal $e.Name }} queries the {{ $e.Name }} edge of a {{ $n.Name }}.
func (c *{{ $client }}) {{ $func }}(m *{{ $n.Name }}) *{{ $builder }} {
	{{- if $n.HasOneFieldID }}
		query := (&{{ $e.Type.ClientName }}{config: c.config}).Query()
		query.path = func(context.Context) (fromV {{ $.Storage.Builder }}, _ error) {
			{{- with extend $n "Receiver" "m" "Edge" $e "Ident" "fromV" }}
				{{ $tmpl := printf "dialect/%s/query/from" $.Storage }}
				{{- xtemplate $tmpl . -}}
			{{- end -}}
			return fromV, nil
		}
		return query
	{{- else }}
		{{- /* For edge schema, we use the predicate-based approach. */}}
		return c.Query().
			Where({{ range $id := $n.EdgeSchema.ID }}{{ $n.Package }}.{{ $id.StructField }}(m.{{ $id.StructField }}),{{ end }}).
			{{ $func }}()
	{{- end }}
}
{{ end }}

{{- if not $n.IsView }}
// Hooks returns the client hooks.
func (c *{{ $client }}) Hooks() []Hook {
	{{- if or $n.NumHooks $n.NumPolicy }}
		hooks := c.hooks.{{ $n.Name }}
		return append(hooks[:len(hooks):len(hooks)], {{ $n.Package }}.Hooks[:]...)
	{{- else }}
		return c.hooks.{{ $n.Name }}
	{{- end }}
}
{{- end }}

// Interceptors returns the client interceptors.
func (c *{{ $client }}) Interceptors() []Interceptor {
	{{- if $n.NumInterceptors }}
		inters := c.inters.{{ $n.Name }}
		return append(inters[:len(inters):len(inters)], {{ $n.Package }}.Interceptors[:]...)
	{{- else }}
		return c.inters.{{ $n.Name }}
	{{- end }}
}

{{ if not $n.IsView }}
func (c *{{ $client }}) mutate(ctx context.Context, m *{{ $n.MutationName }}) (Value, error) {
	switch m.Op() {
	case OpCreate:
		return (&{{ $n.CreateName }}{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
	case OpUpdate:
		return (&{{ $n.UpdateName }}{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
	case OpUpdateOne:
		return (&{{ $n.UpdateOneName }}{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
	case OpDelete, OpDeleteOne:
		return (&{{ $n.DeleteName }}{config: c.config, hooks: c.Hooks(), mutation: m}).Exec(ctx)
	default:
		return nil, fmt.Errorf("{{ $pkg }}: unknown {{ $n.Name }} mutation op: %q", m.Op())
	}
}
{{ end }}
{{- end }}

// hooks and interceptors per client, for fast access.
type (
	{{- $leni := len $.Nodes | add -1 }}
	{{- $hooks := slist }}
	{{- $inters := slist }}
	{{- range $i, $n := $.Nodes }}
		{{- if eq $i $leni }}
			{{ if not $n.IsView }}{{- $hooks = append $hooks (printf "%s []ent.Hook" $n.Name) }}{{ end }}
			{{- $inters = append $inters (printf "%s []ent.Interceptor" $n.Name) }}
		{{- else }}
			{{ if not $n.IsView }}{{- $hooks = append $hooks (print $n.Name ",") }}{{ end }}
			{{- $inters = append $inters (print $n.Name ",") }}
		{{- end }}
	{{- end }}
	hooks struct {
		{{ joinWords $hooks 80 }}
	}
	inters struct {
		{{ joinWords $inters 80 }}
	}
)

{{- /* Support adding config options from both global or dialect-specific templates. */}}
{{- range $prefix := list "" (printf "dialect/%s/" $.Storage) }}
	{{- with $tmpls := matchTemplate (print $prefix "config/options/*") }}
		{{- range $tmpl := $tmpls }}
			{{ xtemplate $tmpl $ }}
		{{- end }}
	{{- end }}
{{- end }}

{{- with $tmpls := matchTemplate "config/additional/*" "config/additional/*/*" }}
	{{- range $tmpl := $tmpls }}
		{{- xtemplate $tmpl $ }}
	{{- end }}
{{- end }}
{{ end }}

{{/* A template that can be overridden in order to add additional fields to the client.*/}}
{{ define "client/fields/additional" }}{{ end }}