hongbo-miao/hongbomiao.com

package utils

import (
    "context"
    "github.com/buger/jsonparser"
    "github.com/dgraph-io/dgo/v230"
    "github.com/dgraph-io/dgo/v230/protos/api"
    "github.com/hongbo-miao/hongbomiao.com/api-go/internal/graphql_server/types"
    "github.com/rs/zerolog/log"
    "go.elastic.co/apm/module/apmgrpc/v2"
    "google.golang.org/grpc"
    "google.golang.org/grpc/credentials/insecure"
)

func GetUser(id string) (*types.User, error) {
    config := GetConfig()
    conn, err := grpc.NewClient(
        config.DgraphHost+":"+config.DgraphGRPCPort,
        grpc.WithUnaryInterceptor(apmgrpc.NewUnaryClientInterceptor()),
        grpc.WithTransportCredentials(insecure.NewCredentials()))
    if err != nil {
        log.Error().Err(err).Msg("grpc.NewClient")
        return nil, err
    }
    defer func(conn *grpc.ClientConn) {
        err := conn.Close()
        if err != nil {
            log.Error().Err(err).Msg("conn.Close")
        }
    }(conn)

    dgraphClient := dgo.NewDgraphClient(api.NewDgraphClient(conn))
    ctx := context.Background()
    txn := dgraphClient.NewTxn()
    defer func(txn *dgo.Txn, ctx context.Context) {
        err := txn.Discard(ctx)
        if err != nil {
            log.Error().Err(err).Msg("txn.Discard")
        }
    }(txn, ctx)

    q := `query User($uid: string) {
      user(func: uid($uid)) {
        name
      }
    }`
    req := &api.Request{
        Query: q,
        Vars:  map[string]string{"$uid": id},
    }
    res, err := txn.Do(ctx, req)
    if err != nil {
        log.Error().Err(err).Msg("txn.Do")
        return nil, err
    }

    name, err := jsonparser.GetString(res.Json, "user", "[0]", "name")
    if err != nil {
        log.Error().
            Err(err).
            Bytes("res.Json", res.Json).
            Msg("jsonparser.GetString")
        return nil, err
    }

    return &types.User{ID: id, Name: name}, nil
}