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clinet.go
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clinet.go
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package kylin
import (
"encoding/base64"
"encoding/json"
"fmt"
"github.com/abulo/ratel/util"
"github.com/valyala/fasthttp"
)
//Config 数据库配置
type Config struct {
Username string //账号 root
Password string //密码
Host string //地址
}
//H 是map[string]interface{} 简写
type H map[string]interface{}
//Client 客户端
type Client struct {
config *Config
request *fasthttp.Request
}
//New 新连接
func New(config *Config) *Client {
return &Client{
config: config,
}
}
//basicAuth 认证
func basicAuth(username, password string) string {
auth := username + ":" + password
return base64.StdEncoding.EncodeToString([]byte(auth))
}
//request 获取请求链接
func (client *Client) doRequest() *Client {
request := fasthttp.AcquireRequest()
request.Header.Set("Authorization", "Basic "+basicAuth(client.config.Username, client.config.Password))
client.request = request
return client
}
//Login 登陆
func (client *Client) Login() (code int, body []byte, err error) {
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/user/authentication")
client.request.Header.SetMethod("POST")
return client.do()
}
//do 执行语句
func (client *Client) do() (code int, body []byte, err error) {
response := fasthttp.AcquireResponse()
err = fasthttp.Do(client.request, response)
if err == nil {
code = response.StatusCode()
body = response.Body()
}
return
}
//QueryKylin 查询
func (client *Client) QueryKylin(query *Query) (code int, body []byte, err error) {
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/query")
client.request.Header.SetMethod("POST")
client.request.Header.Set("Content-Type", "application/json")
client.request.SetBody(query.GetBytes())
return client.do()
}
//ListTables 列出tables project 必须参数
func (client *Client) ListTables(project string) (code int, body []byte, err error) {
if project == "" {
return 0, nil, fmt.Errorf("project is not empty")
}
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/tables_and_columns")
client.request.PostArgs().Add("project", project)
client.request.Header.SetMethod("GET")
return client.do()
}
//ListCubes 列出cubes offset limit 必须参数 cubeName, projectName 可选参数
func (client *Client) ListCubes(offset, limit int, cubeName, projectName string) (code int, body []byte, err error) {
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/cubes")
client.request.Header.SetMethod("GET")
client.request.PostArgs().Add("offset", util.ToString(offset))
client.request.PostArgs().Add("limit", util.ToString(limit))
client.request.PostArgs().Add("cubeName", cubeName)
client.request.PostArgs().Add("projectName", projectName)
return client.do()
}
//GetCube 获取cube //cubeName 必须参数
func (client *Client) GetCube(cubeName string) (code int, body []byte, err error) {
if cubeName == "" {
return 0, nil, fmt.Errorf("cubeName is not empty")
}
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/cubes/" + cubeName)
client.request.Header.SetMethod("GET")
return client.do()
}
//GetCubeDesc 获取cube描述 //cubeName 必须参数
func (client *Client) GetCubeDesc(cubeName string) (code int, body []byte, err error) {
if cubeName == "" {
return 0, nil, fmt.Errorf("cubeName is not empty")
}
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/cube_desc/" + cubeName)
client.request.Header.SetMethod("GET")
return client.do()
}
//GetModel 获取model modelName 必须参数
func (client *Client) GetModel(modelName string) (code int, body []byte, err error) {
if modelName == "" {
return 0, nil, fmt.Errorf("modelName is not empty")
}
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/model/" + modelName)
client.request.Header.SetMethod("GET")
return client.do()
}
//CreateCube 创建cube
func (client *Client) CreateCube(cubeName string) (code int, body []byte, err error) {
client.doRequest()
client.request.SetRequestURI(client.config.Host + "/kylin/api/cubes/" + cubeName + "/rebuild")
client.request.Header.SetMethod("PUT")
return client.do()
}
//Query 执行语句
func (client *Client) Query(sql, project string, offset, limit int) (*QueryResult, error) {
query := &Query{
SQL: sql,
Limit: limit,
Offset: offset,
Project: project,
}
code, body, err := client.QueryKylin(query)
if err != nil {
return nil, err
}
if code != 200 {
return nil, fmt.Errorf("kylin server return error:" + string(body))
}
return handleBody(body)
}
func handleBody(body []byte) (*QueryResult, error) {
if body == nil {
return nil, nil
}
re := &QueryResult{}
err := json.Unmarshal(body, re)
if err != nil {
return nil, err
}
if re.IsException {
return nil, fmt.Errorf(re.ExceptionMessage)
}
return re, nil
}