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resolvers.go
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resolvers.go
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//go:generate gorunpkg github.com/99designs/gqlgen
package starwars
import (
"context"
"errors"
"strings"
"time"
)
type Resolver struct {
humans map[string]Human
droid map[string]Droid
starships map[string]Starship
reviews map[Episode][]Review
}
func (r *Resolver) Droid() DroidResolver {
return &droidResolver{r}
}
func (r *Resolver) FriendsConnection() FriendsConnectionResolver {
return &friendsConnectionResolver{r}
}
func (r *Resolver) Human() HumanResolver {
return &humanResolver{r}
}
func (r *Resolver) Mutation() MutationResolver {
return &mutationResolver{r}
}
func (r *Resolver) Query() QueryResolver {
return &queryResolver{r}
}
func (r *Resolver) Starship() StarshipResolver {
return &starshipResolver{r}
}
func (r *Resolver) resolveCharacters(ctx context.Context, ids []string) ([]Character, error) {
var result []Character
for _, id := range ids {
char, err := r.Query().Character(ctx, id)
if err != nil {
return nil, err
}
result = append(result, char)
}
return result, nil
}
type droidResolver struct{ *Resolver }
func (r *droidResolver) Friends(ctx context.Context, obj *Droid) ([]Character, error) {
return r.resolveCharacters(ctx, obj.FriendIds)
}
func (r *droidResolver) FriendsConnection(ctx context.Context, obj *Droid, first *int, after *string) (FriendsConnection, error) {
return r.resolveFriendConnection(ctx, obj.FriendIds, first, after)
}
type friendsConnectionResolver struct{ *Resolver }
func (r *friendsConnectionResolver) Edges(ctx context.Context, obj *FriendsConnection) ([]FriendsEdge, error) {
friends, err := r.resolveCharacters(ctx, obj.ids)
if err != nil {
return nil, err
}
edges := make([]FriendsEdge, obj.to-obj.from)
for i := range edges {
edges[i] = FriendsEdge{
Cursor: encodeCursor(obj.from + i),
Node: friends[obj.from+i],
}
}
return edges, nil
}
func (r *friendsConnectionResolver) Friends(ctx context.Context, obj *FriendsConnection) ([]Character, error) {
return r.resolveCharacters(ctx, obj.ids)
}
type humanResolver struct{ *Resolver }
func (r *humanResolver) Friends(ctx context.Context, obj *Human) ([]Character, error) {
return r.resolveCharacters(ctx, obj.FriendIds)
}
func (r *humanResolver) FriendsConnection(ctx context.Context, obj *Human, first *int, after *string) (FriendsConnection, error) {
return r.resolveFriendConnection(ctx, obj.FriendIds, first, after)
}
func (r *humanResolver) Starships(ctx context.Context, obj *Human) ([]Starship, error) {
var result []Starship
for _, id := range obj.StarshipIds {
char, err := r.Query().Starship(ctx, id)
if err != nil {
return nil, err
}
if char != nil {
result = append(result, *char)
}
}
return result, nil
}
type mutationResolver struct{ *Resolver }
func (r *mutationResolver) CreateReview(ctx context.Context, episode Episode, review Review) (*Review, error) {
review.Time = time.Now()
time.Sleep(1 * time.Second)
r.reviews[episode] = append(r.reviews[episode], review)
return &review, nil
}
type queryResolver struct{ *Resolver }
func (r *queryResolver) Hero(ctx context.Context, episode *Episode) (Character, error) {
if *episode == EpisodeEmpire {
return r.humans["1000"], nil
}
return r.droid["2001"], nil
}
func (r *queryResolver) Reviews(ctx context.Context, episode Episode, since *time.Time) ([]Review, error) {
if since == nil {
return r.reviews[episode], nil
}
var filtered []Review
for _, rev := range r.reviews[episode] {
if rev.Time.After(*since) {
filtered = append(filtered, rev)
}
}
return filtered, nil
}
func (r *queryResolver) Search(ctx context.Context, text string) ([]SearchResult, error) {
var l []SearchResult
for _, h := range r.humans {
if strings.Contains(h.Name, text) {
l = append(l, h)
}
}
for _, d := range r.droid {
if strings.Contains(d.Name, text) {
l = append(l, d)
}
}
for _, s := range r.starships {
if strings.Contains(s.Name, text) {
l = append(l, s)
}
}
return l, nil
}
func (r *queryResolver) Character(ctx context.Context, id string) (Character, error) {
if h, ok := r.humans[id]; ok {
return &h, nil
}
if d, ok := r.droid[id]; ok {
return &d, nil
}
return nil, nil
}
func (r *queryResolver) Droid(ctx context.Context, id string) (*Droid, error) {
if d, ok := r.droid[id]; ok {
return &d, nil
}
return nil, nil
}
func (r *queryResolver) Human(ctx context.Context, id string) (*Human, error) {
if h, ok := r.humans[id]; ok {
return &h, nil
}
return nil, nil
}
func (r *queryResolver) Starship(ctx context.Context, id string) (*Starship, error) {
if s, ok := r.starships[id]; ok {
return &s, nil
}
return nil, nil
}
type starshipResolver struct{ *Resolver }
func (r *starshipResolver) Length(ctx context.Context, obj *Starship, unit *LengthUnit) (float64, error) {
switch *unit {
case LengthUnitMeter, "":
return obj.Length, nil
case LengthUnitFoot:
return obj.Length * 3.28084, nil
default:
return 0, errors.New("invalid unit")
}
}
func NewResolver() Config {
r := Resolver{}
r.humans = map[string]Human{
"1000": {
CharacterFields: CharacterFields{
ID: "1000",
Name: "Luke Skywalker",
FriendIds: []string{"1002", "1003", "2000", "2001"},
AppearsIn: []Episode{EpisodeNewhope, EpisodeEmpire, EpisodeJedi},
},
heightMeters: 1.72,
Mass: 77,
StarshipIds: []string{"3001", "3003"},
},
"1001": {
CharacterFields: CharacterFields{
ID: "1001",
Name: "Darth Vader",
FriendIds: []string{"1004"},
AppearsIn: []Episode{EpisodeNewhope, EpisodeEmpire, EpisodeJedi},
},
heightMeters: 2.02,
Mass: 136,
StarshipIds: []string{"3002"},
},
"1002": {
CharacterFields: CharacterFields{
ID: "1002",
Name: "Han Solo",
FriendIds: []string{"1000", "1003", "2001"},
AppearsIn: []Episode{EpisodeNewhope, EpisodeEmpire, EpisodeJedi},
},
heightMeters: 1.8,
Mass: 80,
StarshipIds: []string{"3000", "3003"},
},
"1003": {
CharacterFields: CharacterFields{
ID: "1003",
Name: "Leia Organa",
FriendIds: []string{"1000", "1002", "2000", "2001"},
AppearsIn: []Episode{EpisodeNewhope, EpisodeEmpire, EpisodeJedi},
},
heightMeters: 1.5,
Mass: 49,
},
"1004": {
CharacterFields: CharacterFields{
ID: "1004",
Name: "Wilhuff Tarkin",
FriendIds: []string{"1001"},
AppearsIn: []Episode{EpisodeNewhope},
},
heightMeters: 1.8,
Mass: 0,
},
}
r.droid = map[string]Droid{
"2000": {
CharacterFields: CharacterFields{
ID: "2000",
Name: "C-3PO",
FriendIds: []string{"1000", "1002", "1003", "2001"},
AppearsIn: []Episode{EpisodeNewhope, EpisodeEmpire, EpisodeJedi},
},
PrimaryFunction: "Protocol",
},
"2001": {
CharacterFields: CharacterFields{
ID: "2001",
Name: "R2-D2",
FriendIds: []string{"1000", "1002", "1003"},
AppearsIn: []Episode{EpisodeNewhope, EpisodeEmpire, EpisodeJedi},
},
PrimaryFunction: "Astromech",
},
}
r.starships = map[string]Starship{
"3000": {
ID: "3000",
Name: "Millennium Falcon",
History: [][]int{
{1, 2},
{4, 5},
{1, 2},
{3, 2},
},
Length: 34.37,
},
"3001": {
ID: "3001",
Name: "X-Wing",
History: [][]int{
{6, 4},
{3, 2},
{2, 3},
{5, 1},
},
Length: 12.5,
},
"3002": {
ID: "3002",
Name: "TIE Advanced x1",
History: [][]int{
{3, 2},
{7, 2},
{6, 4},
{3, 2},
},
Length: 9.2,
},
"3003": {
ID: "3003",
Name: "Imperial shuttle",
History: [][]int{
{1, 7},
{3, 5},
{5, 3},
{7, 1},
},
Length: 20,
},
}
r.reviews = map[Episode][]Review{}
return Config{
Resolvers: &r,
}
}