Adding very naive (dumb) ingest using v2 api (#1055)

Very rough implementation of the ingest endpoints with `v2` api, but I
think we should merge this and continue working on such "sketchpad". It
basically shows the way.

---------

Signed-off-by: Przemysław Hejman <[email protected]>

quesma/backend_connectors/clickhouse_backend_connector.go

@@ -0,0 +1,98 @@
+// Copyright Quesma, licensed under the Elastic License 2.0.
+// SPDX-License-Identifier: Elastic-2.0
+
+package backend_connectors
+
+import (
+	"context"
+	"database/sql"
+	"github.com/ClickHouse/clickhouse-go/v2"
+
+	quesma_api "quesma_v2/core"
+)
+
+type ClickHouseBackendConnector struct {
+	Endpoint   string
+	connection *sql.DB
+}
+
+type ClickHouseRows struct {
+	rows *sql.Rows
+}
+
+func (p *ClickHouseRows) Next() bool {
+	return p.rows.Next()
+}
+
+func (p *ClickHouseRows) Scan(dest ...interface{}) error {
+	return p.rows.Scan(dest...)
+}
+
+func (p *ClickHouseRows) Close() {
+	err := p.rows.Close()
+	if err != nil {
+		panic(err)
+	}
+}
+
+func (p *ClickHouseRows) Err() error {
+	return p.rows.Err()
+}
+
+func (p *ClickHouseBackendConnector) GetId() quesma_api.BackendConnectorType {
+	return quesma_api.ClickHouseSQLBackend
+}
+
+func (p *ClickHouseBackendConnector) Open() error {
+	conn, err := initDBConnection()
+	if err != nil {
+		return err
+	}
+	p.connection = conn
+	return nil
+}
+
+func (p *ClickHouseBackendConnector) Close() error {
+	if p.connection == nil {
+		return nil
+	}
+	return p.connection.Close()
+}
+
+func (p *ClickHouseBackendConnector) Query(ctx context.Context, query string, args ...interface{}) (quesma_api.Rows, error) {
+	rows, err := p.connection.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	return &ClickHouseRows{rows: rows}, nil
+}
+
+func (p *ClickHouseBackendConnector) Exec(ctx context.Context, query string, args ...interface{}) error {
+	if len(args) == 0 {
+		_, err := p.connection.ExecContext(ctx, query)
+		return err
+	}
+	_, err := p.connection.ExecContext(ctx, query, args...)
+	return err
+}
+
+// func initDBConnection(c *config.QuesmaConfiguration, tlsConfig *tls.Config) *sql.DB {
+func initDBConnection() (*sql.DB, error) {
+	options := clickhouse.Options{Addr: []string{"localhost:9000"}}
+	info := struct {
+		Name    string
+		Version string
+	}{
+		Name:    "quesma",
+		Version: "NEW ODD VERSION", //buildinfo.Version,
+	}
+	options.ClientInfo.Products = append(options.ClientInfo.Products, info)
+	return clickhouse.OpenDB(&options), nil
+
+}
+
+func NewClickHouseBackendConnector(endpoint string) *ClickHouseBackendConnector {
+	return &ClickHouseBackendConnector{
+		Endpoint: endpoint,
+	}
+}

quesma/backend_connectors/elasticsearch_backend_connector.go

@@ -0,0 +1,102 @@
+// Copyright Quesma, licensed under the Elastic License 2.0.
+// SPDX-License-Identifier: Elastic-2.0
+
+package backend_connectors
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net/http"
+	"quesma/elasticsearch"
+	"quesma/quesma/config"
+	quesma_api "quesma_v2/core"
+	"time"
+)
+
+const esRequestTimeout = 5 * time.Second
+
+type Rows struct {
+	Hits []map[string]interface{}
+}
+
+// ElasticsearchBackendConnector is just a test impl -
+// TODO: THIS IS A TRUE QUESTION MARK WHETHER IT IS GOING TO STAY LIKE THIS
+type ElasticsearchBackendConnector struct {
+	client *http.Client
+	config config.ElasticsearchConfiguration
+}
+
+func NewElasticsearchBackendConnector(cfg config.ElasticsearchConfiguration) *ElasticsearchBackendConnector {
+	conn := &ElasticsearchBackendConnector{
+		config: cfg,
+		client: &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+			},
+			Timeout: esRequestTimeout,
+		},
+	}
+	return conn
+}
+
+func (e *ElasticsearchBackendConnector) RequestWithHeaders(ctx context.Context, method, endpoint string, body []byte, headers http.Header) (*http.Response, error) {
+	return e.doRequest(ctx, method, endpoint, body, headers)
+}
+
+func (e *ElasticsearchBackendConnector) doRequest(ctx context.Context, method, endpoint string, body []byte, headers http.Header) (*http.Response, error) {
+	req, err := http.NewRequestWithContext(ctx, method, fmt.Sprintf("%s/%s", e.config.Url, endpoint), bytes.NewBuffer(body))
+	if err != nil {
+		return nil, err
+	}
+	if req.Header.Get("Content-Type") == "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	req = elasticsearch.AddBasicAuthIfNeeded(req, e.config.User, e.config.Password)
+	for key, values := range headers {
+		for _, value := range values {
+			req.Header.Set(key, value)
+		}
+	}
+	return e.client.Do(req)
+}
+
+// HttpBackendConnector is a base interface for sending http requests, for now
+type HttpBackendConnector interface {
+	Send(r *http.Request) *http.Response
+}
+
+func (e *ElasticsearchBackendConnector) Send(r *http.Request) *http.Response {
+	r.Host = e.config.Url.Host
+	r.URL.Host = e.config.Url.Host
+	r.URL.Scheme = e.config.Url.Scheme
+	r.RequestURI = "" // this is important for the request to be sent correctly to a different host
+	maybeAuthdReq := elasticsearch.AddBasicAuthIfNeeded(r, e.config.User, e.config.Password)
+	if resp, err := e.client.Do(maybeAuthdReq); err != nil {
+		fmt.Printf("Error: %v\n", err)
+		panic(err)
+	} else {
+		return resp
+	}
+}
+
+func (e *ElasticsearchBackendConnector) GetId() quesma_api.BackendConnectorType {
+	return quesma_api.ElasticsearchBackend
+}
+
+func (e *ElasticsearchBackendConnector) Open() error {
+	return nil
+}
+
+func (e *ElasticsearchBackendConnector) Query(ctx context.Context, query string, args ...interface{}) (quesma_api.Rows, error) {
+	panic("not implemented")
+}
+
+func (e *ElasticsearchBackendConnector) Exec(ctx context.Context, query string, args ...interface{}) error {
+	panic("not implemented")
+}
+
+func (e *ElasticsearchBackendConnector) Close() error {
+	return nil
+}