refactor: remove dependency, add more docs on method

Remove Influxdb dependency.

go.mod

@@ -2,10 +2,10 @@ module github.com/GuanceCloud/dql-go
 
 go 1.18
 
+require github.com/stretchr/testify v1.8.2
+
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/influxdata/influxdb1-client v0.0.0-20220302092344-a9ab5670611c // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/testify v1.8.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,8 +1,6 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/influxdata/influxdb1-client v0.0.0-20220302092344-a9ab5670611c h1:qSHzRbhzK8RdXOsAdfDgO49TtqC1oZ+acxPrkfTxcCs=
-github.com/influxdata/influxdb1-client v0.0.0-20220302092344-a9ab5670611c/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
 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/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -12,6 +10,7 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

options.go

@@ -125,10 +125,11 @@ func WithSLimit(n int) DQLOption {
 }
 
 // WithTimeRange used to set time range of the DQL query.
-func WithTimeRange(rng [2]int) DQLOption {
+// start and end are UNIX timestamp in ms.
+func WithTimeRange(start, end int) DQLOption {
 	return func(q *dql) {
-		q.TimeRange = append(q.TimeRange, rng[0])
-		q.TimeRange = append(q.TimeRange, rng[1])
+		q.TimeRange = append(q.TimeRange, start)
+		q.TimeRange = append(q.TimeRange, end)
 	}
 }
 

query.go

@@ -6,8 +6,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
-
-	"github.com/influxdata/influxdb1-client/models"
 )
 
 type query struct {
@@ -22,12 +20,12 @@ type Client struct {
 }
 
 // NewClient create a datakit client with IP:Port.
+// For example, local default Datakit host is localhost:9529.
 func NewClient(dk string) *Client {
 	c := &Client{
 		dk: dk,
 	}
 
-	// TODO: new http client
 	c.cli = &http.Client{}
 
 	return c
@@ -44,9 +42,18 @@ type Result struct {
 
 // A DQLResult is a single DQL's query result.
 type DQLResult struct {
-	Series   []*models.Row `json:"series"`
-	RawQuery string        `json:"raw_query,omitempty"`
-	Cost     string        `json:"cost"`
+	Series   []*Row `json:"series"`
+	RawQuery string `json:"raw_query,omitempty"`
+	Cost     string `json:"cost"`
+}
+
+// Row represents a single row returned from the execution of a statement.
+type Row struct {
+	Name    string            `json:"name,omitempty"`
+	Tags    map[string]string `json:"tags,omitempty"`
+	Columns []string          `json:"columns,omitempty"`
+	Values  [][]interface{}   `json:"values,omitempty"`
+	Partial bool              `json:"partial,omitempty"`
 }
 
 // Query send one or more DQL query to Datakit. We can build