forked from romshark/dgraph_graphql_go
/
tCreateReaction.go
192 lines (179 loc) · 4.24 KB
/
tCreateReaction.go
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package dgraph
import (
"context"
"encoding/json"
"time"
"github.com/dgraph-io/dgo/protos/api"
"github.com/pkg/errors"
"github.com/romshark/dgraph_graphql_go/store"
emo "github.com/romshark/dgraph_graphql_go/store/enum/emotion"
strerr "github.com/romshark/dgraph_graphql_go/store/errors"
)
// CreateReaction creates a new post
func (str *impl) CreateReaction(
ctx context.Context,
creationTime time.Time,
authorID store.ID,
subjectID store.ID,
emotion emo.Emotion,
message string,
) (
result store.Reaction,
err error,
) {
result.Creation = creationTime
result.Emotion = emotion
result.Message = message
// Prepare
result.ID = store.NewID()
// Begin transaction
txn, close := str.txn(&err)
if err != nil {
return
}
defer close()
// Ensure author and subject exist
var qr struct {
ByID []UID `json:"byId"`
Author []UID `json:"author"`
PostSubject []UID `json:"postSubject"`
ReactionSubject []UID `json:"reactionSubject"`
}
err = txn.QueryVars(
ctx,
`query User(
$id: string,
$authorId: string,
$subjectId: string
) {
byId(func: eq(Reaction.id, $id)) { uid }
author(func: eq(User.id, $authorId)) { uid }
postSubject(func: eq(Post.id, $subjectId)) { uid }
reactionSubject(func: eq(Reaction.id, $subjectId)) { uid }
}`,
map[string]string{
"$id": string(result.ID),
"$authorId": string(authorID),
"$subjectId": string(subjectID),
},
&qr,
)
if err != nil {
return
}
if len(qr.ByID) > 0 {
err = errors.Errorf("duplicate Reaction.id: %s", result.ID)
return
}
if len(qr.Author) < 1 {
err = strerr.Newf(
strerr.ErrInvalidInput,
"author not found",
)
return
}
// subjectType: "p" for post, "r" for reaction
subjectType := "p"
if len(qr.PostSubject) > 0 {
result.Subject = store.Post{
GraphNode: store.GraphNode{
UID: qr.PostSubject[0].NodeID,
},
}
} else if len(qr.ReactionSubject) > 0 {
subjectType = "r"
result.Subject = store.Reaction{
GraphNode: store.GraphNode{
UID: qr.ReactionSubject[0].NodeID,
},
}
} else {
err = strerr.Newf(
strerr.ErrInvalidInput,
"subject not found",
)
return
}
result.Author = &store.User{
GraphNode: store.GraphNode{
UID: qr.Author[0].NodeID,
},
}
// Create new reaction
var newReactionJSON []byte
newReactionJSON, err = json.Marshal(struct {
ID string `json:"Reaction.id"`
Author UID `json:"Reaction.author"`
Subject UID `json:"Reaction.subject"`
Emotion string `json:"Reaction.emotion"`
Message string `json:"Reaction.message"`
Creation time.Time `json:"Reaction.creation"`
}{
ID: string(result.ID),
Author: UID{NodeID: result.Author.UID},
Subject: UID{NodeID: result.Subject.NodeID()},
Emotion: string(emotion),
Message: message,
Creation: creationTime,
})
if err != nil {
return
}
var reactionCreationMut map[string]string
reactionCreationMut, err = txn.Mutation(ctx, &api.Mutation{
SetJson: newReactionJSON,
})
if err != nil {
return
}
result.UID = reactionCreationMut["blank-0"]
// Update author (User.publishedReactions -> new reaction)
var updatedAuthorJSON []byte
updatedAuthorJSON, err = json.Marshal(struct {
UID string `json:"uid"`
PublishedReactions UID `json:"User.publishedReactions"`
}{
UID: result.Author.UID,
PublishedReactions: UID{NodeID: result.UID},
})
if err != nil {
return
}
_, err = txn.Mutation(ctx, &api.Mutation{
SetJson: updatedAuthorJSON,
})
if err != nil {
return
}
// Update subject
var updateSubjectJSON []byte
if subjectType == "p" {
// Update post (Post.reactions -> new reaction)
updateSubjectJSON, err = json.Marshal(struct {
UID string `json:"uid"`
Reactions UID `json:"Post.reactions"`
}{
UID: result.Subject.NodeID(),
Reactions: UID{NodeID: result.UID},
})
} else {
// Update reaction (Reaction.reactions -> new reaction)
updateSubjectJSON, err = json.Marshal(struct {
UID string `json:"uid"`
Reactions UID `json:"Reaction.reactions"`
}{
UID: result.Subject.NodeID(),
Reactions: UID{NodeID: result.UID},
})
}
if err != nil {
return
}
_, err = txn.Mutation(ctx, &api.Mutation{
SetJson: updateSubjectJSON,
})
if err != nil {
return
}
return
}