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SLO: CRUD API Functionality (#145)
* ListSLOs functionality retrives all SLOs * CreateSLO and GetSLO Functionality implemented * DeleteSLO Functionality implemented * UpdateSLO Functionality implemented * UpdateSLO Functionality corrected * Update Linting Errors * Removes Unnecessary Comments * Update Variable Naming * Lint Checker * Update Tests for SLOs * Updating Slo Types with a comment to original source files * Updated SLO Types and Tests
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‎slo.go‎

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// Slo types lifted from github.com/grafana/slo/pkg/generated/models/slo/slo_type_gen.go
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package gapi
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import (
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"bytes"
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"encoding/json"
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"fmt"
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)
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var sloPath string = "/api/plugins/grafana-slo-app/resources/v1/slo"
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type Slos struct {
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Slos []Slo `json:"slos"`
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}
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const (
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QueryTypeFreeform QueryType = "freeform"
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QueryTypeHistogram QueryType = "histogram"
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QueryTypeRatio QueryType = "ratio"
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QueryTypeThreshold QueryType = "threshold"
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)
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const (
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ThresholdOperatorEmpty ThresholdOperator = "<"
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ThresholdOperatorEqualEqual ThresholdOperator = "=="
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ThresholdOperatorN1 ThresholdOperator = "<="
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ThresholdOperatorN2 ThresholdOperator = ">="
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ThresholdOperatorN3 ThresholdOperator = ">"
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)
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type Alerting struct {
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Annotations []Label `json:"annotations,omitempty"`
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FastBurn *AlertingMetadata `json:"fastBurn,omitempty"`
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Labels []Label `json:"labels,omitempty"`
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SlowBurn *AlertingMetadata `json:"slowBurn,omitempty"`
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}
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type AlertingMetadata struct {
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Annotations []Label `json:"annotations,omitempty"`
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Labels []Label `json:"labels,omitempty"`
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}
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type DashboardRef struct {
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UID string `json:"UID"`
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}
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type FreeformQuery struct {
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Query string `json:"query"`
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}
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type HistogramQuery struct {
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GroupByLabels []string `json:"groupByLabels,omitempty"`
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Metric MetricDef `json:"metric"`
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Percentile float64 `json:"percentile"`
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Threshold Threshold `json:"threshold"`
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}
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type Label struct {
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Key string `json:"key"`
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Value string `json:"value"`
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}
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type MetricDef struct {
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PrometheusMetric string `json:"prometheusMetric"`
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Type *string `json:"type,omitempty"`
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}
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type Objective struct {
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Value float64 `json:"value"`
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Window string `json:"window"`
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}
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type Query struct {
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Freeform *FreeformQuery `json:"freeform,omitempty"`
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Histogram *HistogramQuery `json:"histogram,omitempty"`
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Ratio *RatioQuery `json:"ratio,omitempty"`
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Threshold *ThresholdQuery `json:"threshold,omitempty"`
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Type QueryType `json:"type"`
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}
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type QueryType string
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type RatioQuery struct {
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GroupByLabels []string `json:"groupByLabels,omitempty"`
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SuccessMetric MetricDef `json:"successMetric"`
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TotalMetric MetricDef `json:"totalMetric"`
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}
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type Slo struct {
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Alerting *Alerting `json:"alerting,omitempty"`
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Description string `json:"description"`
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DrillDownDashboardRef *DashboardRef `json:"drillDownDashboardRef,omitempty"`
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Labels []Label `json:"labels,omitempty"`
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Name string `json:"name"`
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Objectives []Objective `json:"objectives"`
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Query Query `json:"query"`
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UUID string `json:"uuid"`
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}
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type Threshold struct {
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Operator ThresholdOperator `json:"operator"`
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Value float64 `json:"value"`
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}
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type ThresholdOperator string
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type ThresholdQuery struct {
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GroupByLabels []string `json:"groupByLabels,omitempty"`
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Metric MetricDef `json:"metric"`
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Threshold Threshold `json:"threshold"`
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}
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type CreateSLOResponse struct {
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Message string `json:"message,omitempty"`
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UUID string `json:"uuid,omitempty"`
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}
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// ListSlos retrieves a list of all Slos
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func (c *Client) ListSlos() (Slos, error) {
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var slos Slos
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if err := c.request("GET", sloPath, nil, nil, &slos); err != nil {
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return Slos{}, err
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}
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return slos, nil
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}
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// GetSLO returns a single Slo based on its uuid
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func (c *Client) GetSlo(uuid string) (Slo, error) {
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var slo Slo
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path := fmt.Sprintf("%s/%s", sloPath, uuid)
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if err := c.request("GET", path, nil, nil, &slo); err != nil {
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return Slo{}, err
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}
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return slo, nil
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}
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// CreateSLO creates a single Slo
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func (c *Client) CreateSlo(slo Slo) (CreateSLOResponse, error) {
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response := CreateSLOResponse{}
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data, err := json.Marshal(slo)
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if err != nil {
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return response, err
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}
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if err := c.request("POST", sloPath, nil, bytes.NewBuffer(data), &response); err != nil {
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return CreateSLOResponse{}, err
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}
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return response, err
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}
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// DeleteSLO deletes the Slo with the passed in UUID
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func (c *Client) DeleteSlo(uuid string) error {
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path := fmt.Sprintf("%s/%s", sloPath, uuid)
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return c.request("DELETE", path, nil, nil, nil)
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}
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// UpdateSLO updates the Slo with the passed in UUID and Slo
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func (c *Client) UpdateSlo(uuid string, slo Slo) error {
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path := fmt.Sprintf("%s/%s", sloPath, uuid)
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data, err := json.Marshal(slo)
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if err != nil {
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return err
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}
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if err := c.request("PUT", path, nil, bytes.NewBuffer(data), nil); err != nil {
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return err
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}
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return nil
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}

‎slo_test.go‎

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package gapi
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import (
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"testing"
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"github.com/gobs/pretty"
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)
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func TestSLOs(t *testing.T) {
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t.Run("list all SLOs succeeds", func(t *testing.T) {
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client := gapiTestTools(t, 200, getSlosJSON)
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resp, err := client.ListSlos()
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slos := resp.Slos
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if err != nil {
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t.Error(err)
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}
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t.Log(pretty.PrettyFormat(slos))
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if len(slos) != 1 {
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t.Errorf("wrong number of contact points returned, got %d", len(slos))
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}
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if slos[0].Name != "list-slos" {
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t.Errorf("incorrect name - expected Name-Test, got %s", slos[0].Name)
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}
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})
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t.Run("get individual SLO succeeds", func(t *testing.T) {
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client := gapiTestTools(t, 200, getSloJSON)
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slo, err := client.GetSlo("qkkrknp12w6tmsdcrfkdf")
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t.Log(pretty.PrettyFormat(slo))
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if err != nil {
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t.Error(err)
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}
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if slo.UUID != "qkkrknp12w6tmsdcrfkdf" {
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t.Errorf("incorrect UID - expected qkkrknp12w6tmsdcrfkdf, got %s", slo.UUID)
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}
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})
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t.Run("get non-existent SLOs fails", func(t *testing.T) {
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client := gapiTestTools(t, 404, getSlosJSON)
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slo, err := client.GetSlo("qkkrknp12w6tmsdcrfkdf")
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if err == nil {
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t.Log(pretty.PrettyFormat(slo))
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t.Error("expected error but got nil")
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}
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})
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t.Run("create SLO succeeds", func(t *testing.T) {
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client := gapiTestTools(t, 201, createSloJSON)
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slo := generateSlo()
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resp, err := client.CreateSlo(slo)
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if err != nil {
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t.Error(err)
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}
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if resp.UUID != "sjnp8wobcbs3eit28n8yb" {
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t.Errorf("unexpected UID returned, got %s", resp.UUID)
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}
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})
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t.Run("update SLO succeeds", func(t *testing.T) {
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client := gapiTestTools(t, 200, createSloJSON)
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slo := generateSlo()
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slo.Description = "Updated Description"
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err := client.UpdateSlo(slo.UUID, slo)
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if err != nil {
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t.Error(err)
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}
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})
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t.Run("delete SLO succeeds", func(t *testing.T) {
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client := gapiTestTools(t, 204, "")
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err := client.DeleteSlo("qkkrknp12w6tmsdcrfkdf")
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if err != nil {
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t.Log(err)
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t.Error(err)
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}
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})
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}
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const getSlosJSON = `
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{
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"slos": [
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{
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"uuid": "qkkrknp12w6tmsdcrfkdf",
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"name": "list-slos",
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"description": "list-slos-description",
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"query": {
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"freeform": {
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"query": "sum(rate(apiserver_request_total{code!=\"500\"}[$__rate_interval])) / sum(rate(apiserver_request_total[$__rate_interval]))"
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},
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"type": "freeform"
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},
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"objectives": [
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{
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"value": 0.995,
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"window": "28d"
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}
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],
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"drillDownDashboardRef": {
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"uid": "5IkqX6P4k"
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}
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}
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]
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}`
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const getSloJSON = `
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{
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"uuid": "qkkrknp12w6tmsdcrfkdf",
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"name": "Name-Test",
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"description": "Description-Test",
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"query": {
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"freeform": {
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"query": "sum(rate(apiserver_request_total{code!=\"500\"}[$__rate_interval])) / sum(rate(apiserver_request_total[$__rate_interval]))"
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},
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"type": "freeform"
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},
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"objectives": [
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{
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"value": 0.995,
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"window": "28d"
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}
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],
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"drillDownDashboardRef": {
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"uid": "5IkqX6P4k"
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}
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}`
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const createSloJSON = `
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{
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"uuid": "sjnp8wobcbs3eit28n8yb",
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"name": "test-name",
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"description": "test-description",
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"query": {
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"freeform": {
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"query": "sum(rate(apiserver_request_total{code!=\"500\"}[$__rate_interval])) / sum(rate(apiserver_request_total[$__rate_interval]))"
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},
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"type": "freeform"
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},
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"objectives": [
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{
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"value": 0.995,
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"window": "30d"
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}
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],
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"drillDownDashboardRef": {
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"uid": "zz5giRyVk"
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}
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}
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`
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func generateSlo() Slo {
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objective := []Objective{{Value: 0.995, Window: "30d"}}
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query := Query{
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Freeform: &FreeformQuery{
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Query: "sum(rate(apiserver_request_total{code!=\"500\"}[$__rate_interval])) / sum(rate(apiserver_request_total[$__rate_interval]))",
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},
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Type: QueryTypeFreeform,
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}
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slo := Slo{
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Name: "test-name",
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Description: "test-description",
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Objectives: objective,
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Query: query,
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}
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return slo
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}

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