commit 490ecb0be2147e59ee7205c9650183abf87ca56d
Author: Pavel Shevaev <pacha.shevaev@gmail.com>
Date:   Wed Oct 26 14:26:49 2022 +0300

    First commit

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..a0519a6
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module git.bit5.ru/backend/clickhouse
+
+go 1.13
+
+require (
+  github.com/stretchr/testify v1.6.1
+	git.bit5.ru/backend/errors v1.0.0
+
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..2741e39
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,11 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/settings/settings.go b/settings/settings.go
new file mode 100644
index 0000000..65c30e6
--- /dev/null
+++ b/settings/settings.go
@@ -0,0 +1,86 @@
+package settings
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/url"
+	"strconv"
+
+	"git.bit5.ru/backend/errors"
+)
+
+// username/password - auth credentials
+// database - select the current default database
+// read_timeout/write_timeout - timeout in second
+// no_delay - disable/enable the Nagle Algorithm for tcp socket (default is 'true' - disable)
+// alt_hosts - comma separated list of single address host for load-balancing
+// connection_open_strategy - random/in_order (default random).
+// random - choose random server from set
+// in_order - first live server is chosen in specified order
+// block_size - maximum rows in block (default is 1000000). If the rows are larger then the data will be split into several blocks to send them to the server
+// pool size - maximum amount of preallocated byte chunks used in queries (default is 100). Decrease this if you experience memory problems at the expense of more GC pressure and vice versa.
+// debug - enable debug output (boolean value)
+
+// Load
+func Load(path string) (ClickhouseSettings, error) {
+	bytes, err := ioutil.ReadFile(path)
+	if err != nil {
+		return ClickhouseSettings{}, errors.WithStack(err)
+	}
+	settings := ClickhouseSettings{}
+	if err := json.Unmarshal(bytes, &settings); err != nil {
+		return ClickhouseSettings{}, errors.WithStack(err)
+	}
+
+	return settings, nil
+}
+
+// ClickhouseSettings
+type ClickhouseSettings struct {
+	Host     string `json:"host"`
+	Port     int    `json:"port"`
+	Database string `json:"database"`
+	Username string `json:"username"`
+	Password string `json:"password"`
+
+	Options map[string]json.RawMessage `json:"opts"`
+}
+
+func (s ClickhouseSettings) DSN() string {
+	options := url.Values{
+		"database": []string{s.Database},
+	}
+	if len(s.Username) > 0 {
+		options.Set("username", s.Username)
+	}
+	if len(s.Password) > 0 {
+		options.Set("password", s.Password)
+	}
+
+	for name, value := range s.Options {
+		var valueString string
+
+		if value[0] == '"' {
+			if err := json.Unmarshal(value, &valueString); err != nil {
+				panic(err)
+			}
+		} else {
+			var valueInt int
+			if err := json.Unmarshal(value, &valueInt); err != nil {
+				panic(err)
+			}
+			valueString = strconv.Itoa(valueInt)
+		}
+
+		options.Set(name, valueString)
+	}
+
+	uri := url.URL{
+		Scheme:   "tcp",
+		Host:     fmt.Sprintf("%s:%d", s.Host, s.Port),
+		RawQuery: options.Encode(),
+	}
+
+	return uri.String()
+}
diff --git a/settings/settings_test.go b/settings/settings_test.go
new file mode 100644
index 0000000..0c93854
--- /dev/null
+++ b/settings/settings_test.go
@@ -0,0 +1,46 @@
+package settings_test
+
+import (
+	"clickhouse/settings"
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLoad(t *testing.T) {
+	expectedSettings := settings.ClickhouseSettings{
+		Host:     "localhost",
+		Port:     9000,
+		Database: "regency_dev",
+		Options: map[string]json.RawMessage{
+			"read_timeout": json.RawMessage(`1`),
+			"no_delay":     json.RawMessage(`"disable"`),
+		},
+	}
+
+	actualSettings, err := settings.Load("./test_settings.json")
+	assert.NoError(t, err)
+
+	assert.Equal(t, expectedSettings, actualSettings)
+
+}
+func TestClickhouseSettings(t *testing.T) {
+	t.Run("DSN", func(t *testing.T) {
+		clickSettings := settings.ClickhouseSettings{
+			Host:     "localhost",
+			Port:     9000,
+			Username: "user",
+			Password: "pwd#1",
+			Database: "regency_dev",
+			Options: map[string]json.RawMessage{
+				"read_timeout": json.RawMessage(`1`),
+				"no_delay":     json.RawMessage(`"disable"`),
+			},
+		}
+
+		expectedDSN := "tcp://localhost:9000?database=regency_dev&no_delay=disable&password=pwd%231&read_timeout=1&username=user"
+
+		assert.Equal(t, expectedDSN, clickSettings.DSN())
+	})
+}
diff --git a/settings/test_settings.json b/settings/test_settings.json
new file mode 100644
index 0000000..90836fc
--- /dev/null
+++ b/settings/test_settings.json
@@ -0,0 +1,9 @@
+{
+    "host": "localhost",
+    "port": 9000,
+    "database": "regency_dev",
+    "opts": {
+        "read_timeout": 1,
+        "no_delay": "disable"
+    }
+  }