Go Client - Qdrant

Installation

Install via go get:

go get github.com/qdrant/go-client

Quick Start

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/qdrant/go-client/qdrant"
)

func main() {
	client, err := qdrant.NewClient(&qdrant.Config{
		Host: "localhost",
		Port: 6334,
	})
	if err != nil {
		log.Fatal(err)
	}
	defer client.Close()

	ctx := context.Background()

	// Create collection
	err = client.CreateCollection(ctx, &qdrant.CreateCollection{
		CollectionName: "my_collection",
		VectorsConfig: qdrant.NewVectorsConfig(&qdrant.VectorParams{
			Size:     384,
			Distance: qdrant.Distance_Cosine,
		}),
	})
	if err != nil {
		log.Fatal(err)
	}

	// Upsert points
	err = client.Upsert(ctx, &qdrant.UpsertPoints{
		CollectionName: "my_collection",
		Points: []*qdrant.PointStruct{
			{
				Id:      qdrant.NewIDNum(1),
				Vectors: qdrant.NewVectors(0.05, 0.61, 0.76, 0.74),
				Payload: qdrant.NewValueMap(map[string]any{
					"city":    "Berlin",
					"country": "Germany",
				}),
			},
			{
				Id:      qdrant.NewIDNum(2),
				Vectors: qdrant.NewVectors(0.19, 0.81, 0.75, 0.11),
				Payload: qdrant.NewValueMap(map[string]any{
					"city":    "London",
					"country": "UK",
				}),
			},
		},
	})
	if err != nil {
		log.Fatal(err)
	}

	// Search
	searchResult, err := client.Search(ctx, &qdrant.SearchPoints{
		CollectionName: "my_collection",
		Vector:         []float32{0.2, 0.1, 0.9, 0.7},
		Limit:          3,
		WithPayload:    qdrant.NewWithPayload(true),
	})
	if err != nil {
		log.Fatal(err)
	}

	for _, point := range searchResult {
		fmt.Printf("ID: %v, Score: %f\n", point.Id, point.Score)
		fmt.Printf("Payload: %v\n", point.Payload)
	}
}

Repository

GitHub Repository

Official Go client: qdrant/go-client

Client Initialization

Basic Connection

import "github.com/qdrant/go-client/qdrant"

// Connect to local instance
client, err := qdrant.NewClient(&qdrant.Config{
	Host: "localhost",
	Port: 6334, // gRPC port
})
if err != nil {
	log.Fatal(err)
}
defer client.Close()

With API Key

client, err := qdrant.NewClient(&qdrant.Config{
	Host:   "your-cluster.cloud.qdrant.io",
	Port:   6334,
	APIKey: "your-api-key",
	UseTLS: true,
})

With Custom Options

import (
	"time"
	"google.golang.org/grpc"
	"github.com/qdrant/go-client/qdrant"
)

client, err := qdrant.NewClient(&qdrant.Config{
	Host:    "localhost",
	Port:    6334,
	Timeout: 30 * time.Second,
	GrpcOptions: []grpc.DialOption{
		grpc.WithMaxMsgSize(100 * 1024 * 1024), // 100MB
	},
})

Collection Management

Create Collection

err := client.CreateCollection(ctx, &qdrant.CreateCollection{
	CollectionName: "my_collection",
	VectorsConfig: qdrant.NewVectorsConfig(&qdrant.VectorParams{
		Size:     768,
		Distance: qdrant.Distance_Cosine,
		OnDisk:   qdrant.PtrOf(false),
	}),
	HnswConfig: &qdrant.HnswConfigDiff{
		M:              qdrant.PtrOf(uint64(16)),
		EfConstruct:    qdrant.PtrOf(uint64(100)),
		FullScanThreshold: qdrant.PtrOf(uint64(10000)),
	},
	ReplicationFactor:       qdrant.PtrOf(uint32(2)),
	WriteConsistencyFactor: qdrant.PtrOf(uint32(1)),
})

Create with Multiple Vectors

err := client.CreateCollection(ctx, &qdrant.CreateCollection{
	CollectionName: "multi_vector",
	VectorsConfig: qdrant.NewVectorsConfigMap(map[string]*qdrant.VectorParams{
		"text": {
			Size:     768,
			Distance: qdrant.Distance_Cosine,
		},
		"image": {
			Size:     512,
			Distance: qdrant.Distance_Euclid,
		},
	}),
})

Get Collection Info

info, err := client.GetCollectionInfo(ctx, "my_collection")
if err != nil {
	log.Fatal(err)
}

fmt.Printf("Status: %v\n", info.Status)
fmt.Printf("Vectors count: %v\n", info.VectorsCount)
fmt.Printf("Points count: %v\n", info.PointsCount)

List Collections

collections, err := client.ListCollections(ctx)
if err != nil {
	log.Fatal(err)
}

for _, collection := range collections.GetCollections() {
	fmt.Println(collection.Name)
}

Delete Collection

err := client.DeleteCollection(ctx, "my_collection")

Point Operations

Upsert Points

err := client.Upsert(ctx, &qdrant.UpsertPoints{
	CollectionName: "my_collection",
	Wait:           qdrant.PtrOf(true),
	Points: []*qdrant.PointStruct{
		{
			Id:      qdrant.NewIDNum(1),
			Vectors: qdrant.NewVectors(0.05, 0.61, 0.76, 0.74),
			Payload: qdrant.NewValueMap(map[string]any{
				"title":    "Document 1",
				"category": "technology",
				"views":    1500,
				"tags":     []string{"ai", "ml", "vector-db"},
			}),
		},
	},
})

Upsert with UUID

import "github.com/google/uuid"

id := uuid.New()
err := client.Upsert(ctx, &qdrant.UpsertPoints{
	CollectionName: "my_collection",
	Points: []*qdrant.PointStruct{
		{
			Id:      qdrant.NewID(id.String()),
			Vectors: qdrant.NewVectors(0.1, 0.2, 0.3),
			Payload: qdrant.NewValueMap(map[string]any{"key": "value"}),
		},
	},
})

Batch Upsert

batchSize := 100
totalPoints := 10000

for i := 0; i < totalPoints; i += batchSize {
	points := make([]*qdrant.PointStruct, 0, batchSize)
	
	for j := i; j < i+batchSize && j < totalPoints; j++ {
		points = append(points, &qdrant.PointStruct{
			Id:      qdrant.NewIDNum(uint64(j)),
			Vectors: qdrant.NewVectors(0.1, 0.2, 0.3, 0.4), // Random in production
			Payload: qdrant.NewValueMap(map[string]any{"index": j}),
		})
	}
	
	err := client.Upsert(ctx, &qdrant.UpsertPoints{
		CollectionName: "my_collection",
		Wait:           qdrant.PtrOf(false),
		Points:         points,
	})
	if err != nil {
		log.Printf("Batch %d failed: %v", i/batchSize, err)
	}
}

Get Points

points, err := client.Get(ctx, &qdrant.GetPoints{
	CollectionName: "my_collection",
	Ids: []*qdrant.PointId{
		qdrant.NewIDNum(1),
		qdrant.NewIDNum(2),
		qdrant.NewIDNum(3),
	},
	WithPayload: qdrant.NewWithPayload(true),
	WithVectors: qdrant.NewWithVectors(true),
})

for _, point := range points {
	fmt.Printf("ID: %v\n", point.Id)
	fmt.Printf("Vectors: %v\n", point.Vectors)
	fmt.Printf("Payload: %v\n", point.Payload)
}

Delete Points

// Delete by IDs
err := client.Delete(ctx, &qdrant.DeletePoints{
	CollectionName: "my_collection",
	Points: &qdrant.PointsSelector{
		PointsSelectorOneOf: &qdrant.PointsSelector_Points{
			Points: &qdrant.PointsIdsList{
				Ids: []*qdrant.PointId{
					qdrant.NewIDNum(1),
					qdrant.NewIDNum(2),
				},
			},
		},
	},
})

// Delete by filter
err = client.Delete(ctx, &qdrant.DeletePoints{
	CollectionName: "my_collection",
	Points: &qdrant.PointsSelector{
		PointsSelectorOneOf: &qdrant.PointsSelector_Filter{
			Filter: &qdrant.Filter{
				Must: []*qdrant.Condition{
					qdrant.NewMatch("category", "outdated"),
				},
			},
		},
	},
})

Search Operations

Basic Search

searchResult, err := client.Search(ctx, &qdrant.SearchPoints{
	CollectionName: "my_collection",
	Vector:         []float32{0.2, 0.1, 0.9, 0.7},
	Limit:          10,
	WithPayload:    qdrant.NewWithPayload(true),
	WithVectors:    qdrant.NewWithVectors(false),
})

for _, point := range searchResult {
	fmt.Printf("ID: %v, Score: %f\n", point.Id, point.Score)
	fmt.Printf("Payload: %v\n", point.Payload)
}

Search with Filtering

searchResult, err := client.Search(ctx, &qdrant.SearchPoints{
	CollectionName: "my_collection",
	Vector:         []float32{0.2, 0.1, 0.9, 0.7},
	Filter: &qdrant.Filter{
		Must: []*qdrant.Condition{
			qdrant.NewMatch("category", "technology"),
			qdrant.NewRange("views", &qdrant.Range{
				Gte: qdrant.PtrOf(1000.0),
				Lt:  qdrant.PtrOf(10000.0),
			}),
		},
	},
	Limit:          5,
	ScoreThreshold: qdrant.PtrOf(float32(0.7)),
})

Search with Parameters

searchResult, err := client.Search(ctx, &qdrant.SearchPoints{
	CollectionName: "my_collection",
	Vector:         []float32{0.2, 0.1, 0.9, 0.7},
	Limit:          20,
	Params: &qdrant.SearchParams{
		HnswEf: qdrant.PtrOf(uint64(128)),
		Exact:  qdrant.PtrOf(false),
		Quantization: &qdrant.QuantizationSearchParams{
			Ignore:       qdrant.PtrOf(false),
			Rescore:      qdrant.PtrOf(true),
			Oversampling: qdrant.PtrOf(2.0),
		},
	},
})

Batch Search

searchResult, err := client.SearchBatch(ctx, &qdrant.SearchBatchPoints{
	CollectionName: "my_collection",
	SearchPoints: []*qdrant.SearchPoints{
		{
			Vector: []float32{0.2, 0.1, 0.9},
			Limit:  5,
		},
		{
			Vector: []float32{0.5, 0.3, 0.2},
			Limit:  10,
		},
	},
})

for i, batch := range searchResult {
	fmt.Printf("Results for query %d:\n", i)
	for _, point := range batch.Result {
		fmt.Printf("  ID: %v, Score: %f\n", point.Id, point.Score)
	}
}

Recommendations

recommendResult, err := client.Recommend(ctx, &qdrant.RecommendPoints{
	CollectionName: "my_collection",
	Positive: []*qdrant.PointId{
		qdrant.NewIDNum(1),
		qdrant.NewIDNum(2),
		qdrant.NewIDNum(3),
	},
	Negative: []*qdrant.PointId{
		qdrant.NewIDNum(10),
	},
	Limit:       10,
	WithPayload: qdrant.NewWithPayload(true),
})

for _, point := range recommendResult {
	fmt.Printf("ID: %v, Score: %f\n", point.Id, point.Score)
}

Query API (Universal)

queryResult, err := client.Query(ctx, &qdrant.QueryPoints{
	CollectionName: "my_collection",
	Query: qdrant.NewQuery([]float32{0.1, 0.2, 0.3, 0.4}),
	Limit:       qdrant.PtrOf(uint64(10)),
	WithPayload: qdrant.NewWithPayload(true),
})

Payload Operations

Set Payload

err := client.SetPayload(ctx, &qdrant.SetPayloadPoints{
	CollectionName: "my_collection",
	Payload: qdrant.NewValueMap(map[string]any{
		"new_field":  "value",
		"updated_at": "2024-01-01",
	}),
	PointsSelector: &qdrant.PointsSelector{
		PointsSelectorOneOf: &qdrant.PointsSelector_Points{
			Points: &qdrant.PointsIdsList{
				Ids: []*qdrant.PointId{
					qdrant.NewIDNum(1),
					qdrant.NewIDNum(2),
				},
			},
		},
	},
})

Delete Payload Keys

err := client.DeletePayload(ctx, &qdrant.DeletePayloadPoints{
	CollectionName: "my_collection",
	Keys:           []string{"old_field", "deprecated"},
	PointsSelector: &qdrant.PointsSelector{
		PointsSelectorOneOf: &qdrant.PointsSelector_Points{
			Points: &qdrant.PointsIdsList{
				Ids: []*qdrant.PointId{qdrant.NewIDNum(1)},
			},
		},
	},
})

Scroll (Pagination)

var offset *qdrant.PointId
var allPoints []*qdrant.RetrievedPoint

for {
	result, err := client.Scroll(ctx, &qdrant.ScrollPoints{
		CollectionName: "my_collection",
		Limit:          qdrant.PtrOf(uint32(100)),
		Offset:         offset,
		WithPayload:    qdrant.NewWithPayload(true),
	})
	if err != nil {
		log.Fatal(err)
	}

	allPoints = append(allPoints, result.Result...)
	offset = result.NextPageOffset

	if offset == nil {
		break
	}
}

fmt.Printf("Total points: %d\n", len(allPoints))

Payload Indexing

// Create keyword index
err := client.CreateFieldIndex(ctx, &qdrant.CreateFieldIndexCollection{
	CollectionName: "my_collection",
	FieldName:      "category",
	FieldType:      qdrant.FieldType_FieldTypeKeyword.Enum(),
})

// Create text index
err = client.CreateFieldIndex(ctx, &qdrant.CreateFieldIndexCollection{
	CollectionName: "my_collection",
	FieldName:      "description",
	FieldType:      qdrant.FieldType_FieldTypeText.Enum(),
	FieldIndexParams: &qdrant.PayloadIndexParams{
		IndexParams: &qdrant.PayloadIndexParams_TextIndexParams{
			TextIndexParams: &qdrant.TextIndexParams{
				Tokenizer:   qdrant.TokenizerType_Word,
				Lowercase:   qdrant.PtrOf(true),
				MinTokenLen: qdrant.PtrOf(uint64(2)),
				MaxTokenLen: qdrant.PtrOf(uint64(20)),
			},
		},
	},
})

// Delete index
err = client.DeleteFieldIndex(ctx, "my_collection", "category")

Count Points

count, err := client.Count(ctx, &qdrant.CountPoints{
	CollectionName: "my_collection",
	Exact:          qdrant.PtrOf(true),
})
if err != nil {
	log.Fatal(err)
}

fmt.Printf("Total points: %d\n", count.GetResult().GetCount())

Error Handling

import (
	"errors"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

info, err := client.GetCollectionInfo(ctx, "nonexistent")
if err != nil {
	if st, ok := status.FromError(err); ok {
		switch st.Code() {
		case codes.NotFound:
			fmt.Println("Collection not found")
		case codes.InvalidArgument:
			fmt.Println("Invalid argument")
		default:
			fmt.Printf("Error: %v\n", st.Message())
		}
	} else {
		log.Fatal(err)
	}
}

Concurrency

import "sync"

func uploadConcurrent(client *qdrant.Client, points [][]*qdrant.PointStruct) error {
	var wg sync.WaitGroup
	errorChan := make(chan error, len(points))

	for _, batch := range points {
		wg.Add(1)
		go func(batch []*qdrant.PointStruct) {
			defer wg.Done()
			err := client.Upsert(context.Background(), &qdrant.UpsertPoints{
				CollectionName: "my_collection",
				Points:         batch,
			})
			if err != nil {
				errorChan <- err
			}
		}(batch)
	}

	wg.Wait()
	close(errorChan)

	for err := range errorChan {
		if err != nil {
			return err
		}
	}

	return nil
}

Context with Timeout

import (
	"context"
	"time"
)

ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()

searchResult, err := client.Search(ctx, &qdrant.SearchPoints{
	CollectionName: "my_collection",
	Vector:         []float32{0.2, 0.1, 0.9, 0.7},
	Limit:          10,
})
if err != nil {
	if ctx.Err() == context.DeadlineExceeded {
		fmt.Println("Search timed out")
	}
	log.Fatal(err)
}

Best Practices

Performance tips:

Reuse client instances across requests
Use batch operations for bulk inserts
Enable connection pooling with gRPC options
Use goroutines for concurrent operations
Always defer client.Close()

Common pitfalls:

Always check error returns
Use context.Context for cancellation and timeouts
Handle gRPC status codes appropriately
Don’t forget to use qdrant.PtrOf() for optional fields

Next Steps

.NET Client

.NET client documentation

gRPC API

Learn about gRPC protocol

​Installation

​Quick Start

​Repository

GitHub Repository

​Client Initialization

​Basic Connection

​With API Key

​With Custom Options

​Collection Management

​Create Collection

​Create with Multiple Vectors

​Get Collection Info

​List Collections

​Delete Collection

​Point Operations

​Upsert Points

​Upsert with UUID

​Batch Upsert

​Get Points

​Delete Points

​Search Operations

​Basic Search

​Search with Filtering

​Search with Parameters

​Batch Search

​Recommendations

​Query API (Universal)

​Payload Operations

​Set Payload

​Delete Payload Keys

​Scroll (Pagination)

​Payload Indexing

​Count Points

​Error Handling

​Concurrency

​Context with Timeout

​Best Practices

​Next Steps

.NET Client

gRPC API

Installation

Quick Start

Repository

Client Initialization

Basic Connection

With API Key

With Custom Options

Collection Management

Create Collection

Create with Multiple Vectors

Get Collection Info

List Collections

Delete Collection

Point Operations

Upsert Points

Upsert with UUID

Batch Upsert

Get Points

Delete Points

Search Operations

Basic Search

Search with Filtering

Search with Parameters

Batch Search

Recommendations

Query API (Universal)

Payload Operations

Set Payload

Delete Payload Keys

Scroll (Pagination)

Payload Indexing

Count Points

Error Handling

Concurrency

Context with Timeout

Best Practices

Next Steps