| // Licensed to Apache Software Foundation (ASF) under one or more contributor |
| // license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright |
| // ownership. Apache Software Foundation (ASF) licenses this file to you 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 gauge |
| |
| import ( |
| "context" |
| "fmt" |
| "math" |
| "strconv" |
| "strings" |
| |
| api "skywalking.apache.org/repo/goapi/query" |
| |
| "github.com/urfave/cli/v2" |
| |
| "github.com/apache/skywalking-cli/pkg/graphql/dashboard" |
| "github.com/apache/skywalking-cli/pkg/util" |
| |
| "github.com/mum4k/termdash" |
| "github.com/mum4k/termdash/cell" |
| "github.com/mum4k/termdash/container" |
| "github.com/mum4k/termdash/container/grid" |
| "github.com/mum4k/termdash/linestyle" |
| "github.com/mum4k/termdash/terminal/termbox" |
| "github.com/mum4k/termdash/terminal/terminalapi" |
| "github.com/mum4k/termdash/widgets/gauge" |
| "github.com/mum4k/termdash/widgets/text" |
| ) |
| |
| const RootID = "root" |
| |
| type MetricColumn struct { |
| title *text.Text |
| gauges []*gauge.Gauge |
| aggregationNum int |
| } |
| |
| // Update updates the MetricColumn's `Absolute` and `BorderTitle`. |
| func (mc *MetricColumn) Update(data []*api.SelectedRecord) error { |
| for i, item := range data { |
| // The number of `SelectedRecord` data may exceed the number of gauges in a `MetricColumn`. |
| if i >= len(mc.gauges) { |
| break |
| } |
| |
| strValue := *(item.Value) |
| v, err := strconv.Atoi(strValue) |
| if err != nil { |
| return err |
| } |
| |
| if mc.aggregationNum != 0 { |
| strValue = fmt.Sprintf("%.4f", float64(v)/float64(mc.aggregationNum)) |
| } |
| |
| maxValue, err := findMaxValue(data) |
| if err != nil { |
| return err |
| } |
| |
| if err := mc.gauges[i].Absolute(v, maxValue, gauge.BorderTitle("["+strValue+"]")); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func NewMetricColumn(column []*api.SelectedRecord, config *dashboard.MetricTemplate) (*MetricColumn, error) { |
| var ret MetricColumn |
| |
| t, err := text.New() |
| if err != nil { |
| return nil, err |
| } |
| if err := t.Write(config.Title, text.WriteCellOpts(cell.FgColor(cell.ColorRed))); err != nil { |
| return nil, err |
| } |
| ret.title = t |
| |
| if len(column) == 0 { |
| return nil, fmt.Errorf("the metrics data is empty, please check the GraphQL backend") |
| } |
| |
| for _, item := range column { |
| strValue := *(item.Value) |
| v, err := strconv.Atoi(strValue) |
| if err != nil { |
| return nil, err |
| } |
| |
| if config.AggregationNum != "" { |
| aggregationNum, convErr := strconv.Atoi(config.AggregationNum) |
| if convErr != nil { |
| return nil, convErr |
| } |
| strValue = fmt.Sprintf("%.4f", float64(v)/float64(aggregationNum)) |
| ret.aggregationNum = aggregationNum |
| } |
| |
| g, err := gauge.New( |
| gauge.Height(1), |
| gauge.Border(linestyle.Light), |
| gauge.Color(cell.ColorMagenta), |
| gauge.BorderTitle("["+strValue+"]"), |
| gauge.HideTextProgress(), |
| gauge.TextLabel(item.Name), |
| ) |
| if err != nil { |
| return nil, err |
| } |
| |
| maxValue, err := findMaxValue(column) |
| if err != nil { |
| return nil, err |
| } |
| |
| if err := g.Absolute(v, maxValue); err != nil { |
| return nil, err |
| } |
| ret.gauges = append(ret.gauges, g) |
| } |
| |
| return &ret, nil |
| } |
| |
| // MetricColumnsElement is the part that separated from layout, |
| // which can be reused by global dashboard. |
| func MetricColumnsElement(columns []*MetricColumn) []grid.Element { |
| var metricColumns []grid.Element |
| var columnWidthPerc int |
| |
| // For the best display effect, the maximum number of columns that can be displayed |
| const MaxColumnNum = 4 |
| // For the best display effect, the maximum number of gauges |
| // that can be displayed in each column |
| const MaxGaugeNum = 6 |
| const TitleHeight = 10 |
| |
| // Number of columns to display, each column represents a global metric |
| // The number should be less than or equal to MaxColumnNum |
| columnNum := int(math.Min(MaxColumnNum, float64(len(columns)))) |
| |
| // columnWidthPerc should be in the range (0, 100) |
| if columnNum > 1 { |
| columnWidthPerc = 100 / columnNum |
| } else { |
| columnWidthPerc = 99 |
| } |
| |
| for i := 0; i < columnNum; i++ { |
| var column []grid.Element |
| column = append(column, grid.RowHeightPerc(TitleHeight, grid.Widget(columns[i].title))) |
| |
| // Number of gauge in a column, each gauge represents a service or endpoint |
| // The number should be less than or equal to MaxGaugeNum |
| gaugeNum := int(math.Min(MaxGaugeNum, float64(len(columns[i].gauges)))) |
| gaugeHeight := int(math.Floor(float64(99-TitleHeight) / float64(gaugeNum))) |
| |
| for j := 0; j < gaugeNum; j++ { |
| column = append(column, grid.RowHeightPerc(gaugeHeight, grid.Widget(columns[i].gauges[j]))) |
| } |
| metricColumns = append(metricColumns, grid.ColWidthPerc(columnWidthPerc, column...)) |
| } |
| |
| return metricColumns |
| } |
| |
| func layout(columns []grid.Element) ([]container.Option, error) { |
| builder := grid.New() |
| builder.Add( |
| grid.RowHeightPerc(10), |
| grid.RowHeightPerc(80, columns...), |
| ) |
| |
| gridOpts, err := builder.Build() |
| if err != nil { |
| return nil, err |
| } |
| return gridOpts, nil |
| } |
| |
| func Display(ctx *cli.Context, metrics [][]*api.SelectedRecord) error { |
| t, err := termbox.New() |
| if err != nil { |
| return err |
| } |
| defer t.Close() |
| |
| c, err := container.New( |
| t, |
| container.ID(RootID), |
| ) |
| if err != nil { |
| return err |
| } |
| |
| var columns []*MetricColumn |
| |
| configs, err := dashboard.LoadTemplate(ctx.String("template")) |
| if err != nil { |
| return nil |
| } |
| |
| for i := range configs.Metrics { |
| col, innerErr := NewMetricColumn(metrics[i], &configs.Metrics[i]) |
| if innerErr != nil { |
| return innerErr |
| } |
| columns = append(columns, col) |
| } |
| |
| gridOpts, err := layout(MetricColumnsElement(columns)) |
| if err != nil { |
| return err |
| } |
| |
| err = c.Update(RootID, append( |
| gridOpts, |
| container.Border(linestyle.Light), |
| container.BorderTitle("[Global Metrics]-PRESS Q TO QUIT"))..., |
| ) |
| |
| if err != nil { |
| return err |
| } |
| |
| con, cancel := context.WithCancel(context.Background()) |
| quitter := func(keyboard *terminalapi.Keyboard) { |
| if strings.EqualFold(keyboard.Key.String(), "q") { |
| cancel() |
| } |
| } |
| |
| err = termdash.Run(con, t, c, termdash.KeyboardSubscriber(quitter)) |
| |
| return err |
| } |
| |
| // findMaxValue finds the maximum value in the array of `schema.SelectedRecord`. |
| func findMaxValue(column []*api.SelectedRecord) (int, error) { |
| var ret int |
| |
| for _, c := range column { |
| v, err := strconv.Atoi(*(c.Value)) |
| if err != nil { |
| return ret, err |
| } |
| ret = util.MaxInt(ret, v) |
| } |
| |
| return ret, nil |
| } |