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dashboard.go
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dashboard.go
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/*
Copyright 2016 Vastech SA (PTY) LTD
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package grafana
import (
"encoding/json"
"log"
"net/url"
"strings"
)
type PanelType int
const (
SingleStat PanelType = iota
Text
Graph
Table
)
func (p PanelType) string() string {
return [...]string{
"singlestat",
"text",
"graph",
"table",
}[p]
}
// Panel represents a Grafana dashboard panel
type Panel struct {
Id int
Type string
Title string
GridPos GridPos
}
// Panel represents a Grafana dashboard panel position
type GridPos struct {
H float64 `json:"h"`
W float64 `json:"w"`
X float64 `json:"x"`
Y float64 `json:"y"`
}
// Row represents a container for Panels
type Row struct {
Id int
Showtitle bool
Title string
Panels []Panel
}
// Dashboard represents a Grafana dashboard
// This is both used to unmarshal the dashbaord JSON into
// and then enriched (sanitize fields for TeX consumption and add VarialbeValues)
type Dashboard struct {
Title string
Description string
VariableValues string //Not present in the Grafana JSON structure. Enriched data passed used by the Tex templating
Rows []Row
Panels []Panel
}
type dashContainer struct {
Dashboard Dashboard
Meta struct {
Slug string
}
}
// NewDashboard creates Dashboard from Grafana's internal JSON dashboard definition
func NewDashboard(dashJSON []byte, variables url.Values) Dashboard {
var dash dashContainer
err := json.Unmarshal(dashJSON, &dash)
if err != nil {
panic(err)
}
d := dash.NewDashboard(variables)
log.Printf("Populated dashboard datastructure: %+v\n", d)
return d
}
func (dc dashContainer) NewDashboard(variables url.Values) Dashboard {
var dash Dashboard
dash.Title = sanitizeLaTexInput(dc.Dashboard.Title)
dash.Description = sanitizeLaTexInput(dc.Dashboard.Description)
dash.VariableValues = sanitizeLaTexInput(getVariablesValues(variables))
if len(dc.Dashboard.Rows) == 0 {
return populatePanelsFromV5JSON(dash, dc)
}
return populatePanelsFromV4JSON(dash, dc)
}
func populatePanelsFromV4JSON(dash Dashboard, dc dashContainer) Dashboard {
for _, row := range dc.Dashboard.Rows {
row.Title = sanitizeLaTexInput(row.Title)
for i, p := range row.Panels {
p.Title = sanitizeLaTexInput(p.Title)
row.Panels[i] = p
dash.Panels = append(dash.Panels, p)
}
dash.Rows = append(dash.Rows, row)
}
return dash
}
func populatePanelsFromV5JSON(dash Dashboard, dc dashContainer) Dashboard {
for _, p := range dc.Dashboard.Panels {
if p.Type == "row" {
continue
}
p.Title = sanitizeLaTexInput(p.Title)
dash.Panels = append(dash.Panels, p)
}
return dash
}
func (p Panel) IsSingleStat() bool {
return p.Is(SingleStat)
}
func (p Panel) IsPartialWidth() bool {
return (p.GridPos.W < 24)
}
func (p Panel) Width() float64 {
return float64(p.GridPos.W) * 0.04
}
func (p Panel) Height() float64 {
return float64(p.GridPos.H) * 0.04
}
func (p Panel) Is(t PanelType) bool {
if p.Type == t.string() {
return true
}
return false
}
func (r Row) IsVisible() bool {
return r.Showtitle
}
func getVariablesValues(variables url.Values) string {
values := []string{}
for _, v := range variables {
values = append(values, strings.Join(v, ", "))
}
return strings.Join(values, ", ")
}
func sanitizeLaTexInput(input string) string {
input = strings.Replace(input, "\\", "\\textbackslash ", -1)
input = strings.Replace(input, "&", "\\&", -1)
input = strings.Replace(input, "%", "\\%", -1)
input = strings.Replace(input, "$", "\\$", -1)
input = strings.Replace(input, "#", "\\#", -1)
input = strings.Replace(input, "_", "\\_", -1)
input = strings.Replace(input, "{", "\\{", -1)
input = strings.Replace(input, "}", "\\}", -1)
input = strings.Replace(input, "~", "\\textasciitilde ", -1)
input = strings.Replace(input, "^", "\\textasciicircum ", -1)
return input
}