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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| package pkg | ||
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| import "github.com/wcharczuk/go-chart/v2" | ||
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| type DonutChart struct { | ||
| chart *Chart | ||
| } | ||
|
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| func NewDonutChart() *DonutChart { | ||
| return &DonutChart{ | ||
| chart: NewChart(), | ||
| } | ||
| } | ||
| func (c *DonutChart) GetValues(names []string, values []float64) []chart.Value { | ||
| var chartValues []chart.Value | ||
| for i := 0; i < len(names); i++ { | ||
| chartValues = append(chartValues, chart.Value{ | ||
| Value: values[i], | ||
| Label: names[i], | ||
| }) | ||
| } | ||
| return chartValues | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package pkg | ||
|
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| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "net/http" | ||
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| "github.com/labstack/echo/v4" | ||
| "github.com/wcharczuk/go-chart/v2" | ||
| ) | ||
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| type DonutChartHandler struct { | ||
| chart *DonutChart | ||
| } | ||
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| func NewDonutChartHandler() *DonutChartHandler { | ||
| return &DonutChartHandler{ | ||
| chart: NewDonutChart(), | ||
| } | ||
| } | ||
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| type DonutChartRequest struct { | ||
| ChartData string `json:"data" query:"data" form:"data" validate:"required" message:"data is required"` | ||
| ChartTitle string `json:"title" query:"title" form:"title"` | ||
| Height int `json:"height" query:"height" form:"height"` | ||
| Width int `json:"width" query:"width" form:"width"` | ||
| } | ||
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| type DonutChartData struct { | ||
| Names []string `json:"names"` | ||
| Values []float64 `json:"values"` | ||
| } | ||
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| func (h *DonutChartHandler) Get(c echo.Context) ([]byte, error) { | ||
| req := new(DonutChartRequest) | ||
| if err := BindRequest(c, req); err != nil { | ||
| return nil, echo.NewHTTPError(http.StatusUnprocessableEntity, err.Error()) | ||
| } | ||
|
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| var data DonutChartData | ||
| if err := json.Unmarshal([]byte(req.ChartData), &data); err != nil { | ||
| return nil, echo.NewHTTPError(http.StatusUnprocessableEntity, err.Error()) | ||
| } | ||
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| if len(data.Values) == 0 || len(data.Values) != len(data.Names) { | ||
| return nil, echo.NewHTTPError(http.StatusUnprocessableEntity, "data provided is invalid") | ||
| } | ||
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| graph := chart.DonutChart{ | ||
| Title: req.ChartTitle, | ||
| Height: req.Height, | ||
| Width: req.Width, | ||
| Values: h.chart.GetValues(data.Names, data.Values), | ||
| } | ||
|
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| buffer := bytes.NewBuffer([]byte{}) | ||
| err := graph.Render(chart.PNG, buffer) | ||
| if err != nil { | ||
| return nil, echo.NewHTTPError(http.StatusUnprocessableEntity, err.Error()) | ||
| } | ||
| return buffer.Bytes(), err | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| package pkg | ||
|
|
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| import ( | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "net/url" | ||
| "testing" | ||
|
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| "github.com/labstack/echo/v4" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
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| func TestGetDonutChart(t *testing.T) { | ||
| e := echo.New() | ||
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| e.GET("/donut", func(c echo.Context) error { | ||
| img, err := NewDonutChartHandler().Get(c) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return c.Blob(http.StatusOK, "image/png", img) | ||
| }) | ||
|
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| // Start a test HTTP server | ||
| server := httptest.NewServer(e) | ||
| defer server.Close() | ||
|
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| type TestCase struct { | ||
| QueryParams string | ||
| ExpectedStatus int | ||
| } | ||
| testCases := []TestCase{ | ||
| { | ||
| QueryParams: `{"names": ["Monday","Tuesday","Wednesday"], "values": [1,2,3]}`, | ||
| ExpectedStatus: http.StatusOK, | ||
| }, | ||
| { | ||
| QueryParams: `{"names": ["Monday,"Tuesday","Wednesday"], "values": [1,2,3]}`, | ||
| ExpectedStatus: http.StatusUnprocessableEntity, | ||
| }, | ||
| { | ||
| QueryParams: `{"names": [["Monday","Tuesday","Wednesday"]], "values": [1,2,3]}`, | ||
| ExpectedStatus: http.StatusUnprocessableEntity, | ||
| }, | ||
| } | ||
|
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| for _, tc := range testCases { | ||
| url := server.URL + "/donut?data=" + url.QueryEscape(tc.QueryParams) | ||
| resp, err := http.Get(url) | ||
| assert.NoError(t, err) | ||
| assert.Equal(t, tc.ExpectedStatus, resp.StatusCode) | ||
| } | ||
| } |
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