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node.go
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node.go
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// Code generated by entc, DO NOT EDIT.
package ent
import (
"context"
"encoding/json"
"fmt"
"sync"
"sync/atomic"
"entgo.io/contrib/entgql"
"entgo.io/ent/dialect"
"entgo.io/ent/dialect/sql"
"entgo.io/ent/dialect/sql/schema"
"github.com/99designs/gqlgen/graphql"
"github.com/gibalmeida/go-jobs/ent/department"
"github.com/gibalmeida/go-jobs/ent/job"
"github.com/gibalmeida/go-jobs/ent/user"
"github.com/hashicorp/go-multierror"
"golang.org/x/sync/semaphore"
)
// Noder wraps the basic Node method.
type Noder interface {
Node(context.Context) (*Node, error)
}
// Node in the graph.
type Node struct {
ID int `json:"id,omitempty"` // node id.
Type string `json:"type,omitempty"` // node type.
Fields []*Field `json:"fields,omitempty"` // node fields.
Edges []*Edge `json:"edges,omitempty"` // node edges.
}
// Field of a node.
type Field struct {
Type string `json:"type,omitempty"` // field type.
Name string `json:"name,omitempty"` // field name (as in struct).
Value string `json:"value,omitempty"` // stringified value.
}
// Edges between two nodes.
type Edge struct {
Type string `json:"type,omitempty"` // edge type.
Name string `json:"name,omitempty"` // edge name.
IDs []int `json:"ids,omitempty"` // node ids (where this edge point to).
}
func (d *Department) Node(ctx context.Context) (node *Node, err error) {
node = &Node{
ID: d.ID,
Type: "Department",
Fields: make([]*Field, 1),
Edges: make([]*Edge, 2),
}
var buf []byte
if buf, err = json.Marshal(d.Name); err != nil {
return nil, err
}
node.Fields[0] = &Field{
Type: "string",
Name: "name",
Value: string(buf),
}
node.Edges[0] = &Edge{
Type: "Job",
Name: "jobs",
}
node.Edges[0].IDs, err = d.QueryJobs().
Select(job.FieldID).
Ints(ctx)
if err != nil {
return nil, err
}
node.Edges[1] = &Edge{
Type: "User",
Name: "manager",
}
node.Edges[1].IDs, err = d.QueryManager().
Select(user.FieldID).
Ints(ctx)
if err != nil {
return nil, err
}
return node, nil
}
func (j *Job) Node(ctx context.Context) (node *Node, err error) {
node = &Node{
ID: j.ID,
Type: "Job",
Fields: make([]*Field, 2),
Edges: make([]*Edge, 1),
}
var buf []byte
if buf, err = json.Marshal(j.Name); err != nil {
return nil, err
}
node.Fields[0] = &Field{
Type: "string",
Name: "name",
Value: string(buf),
}
if buf, err = json.Marshal(j.Description); err != nil {
return nil, err
}
node.Fields[1] = &Field{
Type: "string",
Name: "description",
Value: string(buf),
}
node.Edges[0] = &Edge{
Type: "Department",
Name: "department",
}
node.Edges[0].IDs, err = j.QueryDepartment().
Select(department.FieldID).
Ints(ctx)
if err != nil {
return nil, err
}
return node, nil
}
func (u *User) Node(ctx context.Context) (node *Node, err error) {
node = &Node{
ID: u.ID,
Type: "User",
Fields: make([]*Field, 6),
Edges: make([]*Edge, 1),
}
var buf []byte
if buf, err = json.Marshal(u.CreateTime); err != nil {
return nil, err
}
node.Fields[0] = &Field{
Type: "time.Time",
Name: "create_time",
Value: string(buf),
}
if buf, err = json.Marshal(u.UpdateTime); err != nil {
return nil, err
}
node.Fields[1] = &Field{
Type: "time.Time",
Name: "update_time",
Value: string(buf),
}
if buf, err = json.Marshal(u.Name); err != nil {
return nil, err
}
node.Fields[2] = &Field{
Type: "string",
Name: "name",
Value: string(buf),
}
if buf, err = json.Marshal(u.Email); err != nil {
return nil, err
}
node.Fields[3] = &Field{
Type: "string",
Name: "email",
Value: string(buf),
}
if buf, err = json.Marshal(u.Password); err != nil {
return nil, err
}
node.Fields[4] = &Field{
Type: "string",
Name: "password",
Value: string(buf),
}
if buf, err = json.Marshal(u.Role); err != nil {
return nil, err
}
node.Fields[5] = &Field{
Type: "user.Role",
Name: "role",
Value: string(buf),
}
node.Edges[0] = &Edge{
Type: "Department",
Name: "departments",
}
node.Edges[0].IDs, err = u.QueryDepartments().
Select(department.FieldID).
Ints(ctx)
if err != nil {
return nil, err
}
return node, nil
}
func (c *Client) Node(ctx context.Context, id int) (*Node, error) {
n, err := c.Noder(ctx, id)
if err != nil {
return nil, err
}
return n.Node(ctx)
}
var errNodeInvalidID = &NotFoundError{"node"}
// NodeOption allows configuring the Noder execution using functional options.
type NodeOption func(*nodeOptions)
// WithNodeType sets the node Type resolver function (i.e. the table to query).
// If was not provided, the table will be derived from the universal-id
// configuration as described in: https://entgo.io/docs/migrate/#universal-ids.
func WithNodeType(f func(context.Context, int) (string, error)) NodeOption {
return func(o *nodeOptions) {
o.nodeType = f
}
}
// WithFixedNodeType sets the Type of the node to a fixed value.
func WithFixedNodeType(t string) NodeOption {
return WithNodeType(func(context.Context, int) (string, error) {
return t, nil
})
}
type nodeOptions struct {
nodeType func(context.Context, int) (string, error)
}
func (c *Client) newNodeOpts(opts []NodeOption) *nodeOptions {
nopts := &nodeOptions{}
for _, opt := range opts {
opt(nopts)
}
if nopts.nodeType == nil {
nopts.nodeType = func(ctx context.Context, id int) (string, error) {
return c.tables.nodeType(ctx, c.driver, id)
}
}
return nopts
}
// Noder returns a Node by its id. If the NodeType was not provided, it will
// be derived from the id value according to the universal-id configuration.
//
// c.Noder(ctx, id)
// c.Noder(ctx, id, ent.WithNodeType(pet.Table))
//
func (c *Client) Noder(ctx context.Context, id int, opts ...NodeOption) (_ Noder, err error) {
defer func() {
if IsNotFound(err) {
err = multierror.Append(err, entgql.ErrNodeNotFound(id))
}
}()
table, err := c.newNodeOpts(opts).nodeType(ctx, id)
if err != nil {
return nil, err
}
return c.noder(ctx, table, id)
}
func (c *Client) noder(ctx context.Context, table string, id int) (Noder, error) {
switch table {
case department.Table:
n, err := c.Department.Query().
Where(department.ID(id)).
CollectFields(ctx, "Department").
Only(ctx)
if err != nil {
return nil, err
}
return n, nil
case job.Table:
n, err := c.Job.Query().
Where(job.ID(id)).
CollectFields(ctx, "Job").
Only(ctx)
if err != nil {
return nil, err
}
return n, nil
case user.Table:
n, err := c.User.Query().
Where(user.ID(id)).
CollectFields(ctx, "User").
Only(ctx)
if err != nil {
return nil, err
}
return n, nil
default:
return nil, fmt.Errorf("cannot resolve noder from table %q: %w", table, errNodeInvalidID)
}
}
func (c *Client) Noders(ctx context.Context, ids []int, opts ...NodeOption) ([]Noder, error) {
switch len(ids) {
case 1:
noder, err := c.Noder(ctx, ids[0], opts...)
if err != nil {
return nil, err
}
return []Noder{noder}, nil
case 0:
return []Noder{}, nil
}
noders := make([]Noder, len(ids))
errors := make([]error, len(ids))
tables := make(map[string][]int)
id2idx := make(map[int][]int, len(ids))
nopts := c.newNodeOpts(opts)
for i, id := range ids {
table, err := nopts.nodeType(ctx, id)
if err != nil {
errors[i] = err
continue
}
tables[table] = append(tables[table], id)
id2idx[id] = append(id2idx[id], i)
}
for table, ids := range tables {
nodes, err := c.noders(ctx, table, ids)
if err != nil {
for _, id := range ids {
for _, idx := range id2idx[id] {
errors[idx] = err
}
}
} else {
for i, id := range ids {
for _, idx := range id2idx[id] {
noders[idx] = nodes[i]
}
}
}
}
for i, id := range ids {
if errors[i] == nil {
if noders[i] != nil {
continue
}
errors[i] = entgql.ErrNodeNotFound(id)
} else if IsNotFound(errors[i]) {
errors[i] = multierror.Append(errors[i], entgql.ErrNodeNotFound(id))
}
ctx := graphql.WithPathContext(ctx,
graphql.NewPathWithIndex(i),
)
graphql.AddError(ctx, errors[i])
}
return noders, nil
}
func (c *Client) noders(ctx context.Context, table string, ids []int) ([]Noder, error) {
noders := make([]Noder, len(ids))
idmap := make(map[int][]*Noder, len(ids))
for i, id := range ids {
idmap[id] = append(idmap[id], &noders[i])
}
switch table {
case department.Table:
nodes, err := c.Department.Query().
Where(department.IDIn(ids...)).
CollectFields(ctx, "Department").
All(ctx)
if err != nil {
return nil, err
}
for _, node := range nodes {
for _, noder := range idmap[node.ID] {
*noder = node
}
}
case job.Table:
nodes, err := c.Job.Query().
Where(job.IDIn(ids...)).
CollectFields(ctx, "Job").
All(ctx)
if err != nil {
return nil, err
}
for _, node := range nodes {
for _, noder := range idmap[node.ID] {
*noder = node
}
}
case user.Table:
nodes, err := c.User.Query().
Where(user.IDIn(ids...)).
CollectFields(ctx, "User").
All(ctx)
if err != nil {
return nil, err
}
for _, node := range nodes {
for _, noder := range idmap[node.ID] {
*noder = node
}
}
default:
return nil, fmt.Errorf("cannot resolve noders from table %q: %w", table, errNodeInvalidID)
}
return noders, nil
}
type tables struct {
once sync.Once
sem *semaphore.Weighted
value atomic.Value
}
func (t *tables) nodeType(ctx context.Context, drv dialect.Driver, id int) (string, error) {
tables, err := t.Load(ctx, drv)
if err != nil {
return "", err
}
idx := int(id / (1<<32 - 1))
if idx < 0 || idx >= len(tables) {
return "", fmt.Errorf("cannot resolve table from id %v: %w", id, errNodeInvalidID)
}
return tables[idx], nil
}
func (t *tables) Load(ctx context.Context, drv dialect.Driver) ([]string, error) {
if tables := t.value.Load(); tables != nil {
return tables.([]string), nil
}
t.once.Do(func() { t.sem = semaphore.NewWeighted(1) })
if err := t.sem.Acquire(ctx, 1); err != nil {
return nil, err
}
defer t.sem.Release(1)
if tables := t.value.Load(); tables != nil {
return tables.([]string), nil
}
tables, err := t.load(ctx, drv)
if err == nil {
t.value.Store(tables)
}
return tables, err
}
func (tables) load(ctx context.Context, drv dialect.Driver) ([]string, error) {
rows := &sql.Rows{}
query, args := sql.Dialect(drv.Dialect()).
Select("type").
From(sql.Table(schema.TypeTable)).
OrderBy(sql.Asc("id")).
Query()
if err := drv.Query(ctx, query, args, rows); err != nil {
return nil, err
}
defer rows.Close()
var tables []string
return tables, sql.ScanSlice(rows, &tables)
}