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Refactor label parsing to set OF labels last
**What** - Ensure that internal OF labels are set after user labels to ensure that users do no override these internal values - Refactor the getMinReplicaCount to work with the labels pointer, this helps simplify the control flow in the handler methods - Add constants for the label keys and update all references to those keys throughout Closes openfaas#209 Signed-off-by: Lucas Roesler <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package handlers | ||
|
|
||
| import ( | ||
| "log" | ||
| "strconv" | ||
| ) | ||
|
|
||
| const ( | ||
| // initialReplicasCount how many replicas to start of creating for a function, this is | ||
| // also used as the default return value for getMinReplicaCount | ||
| initialReplicasCount = 1 | ||
|
|
||
| // OFFunctionNameLabel is the label key used by OpenFaaS to store the function name | ||
| // on the resources managed by OpenFaaS for that function. This key is also used to | ||
| // denote that a resource is a "Function" | ||
| OFFunctionNameLabel = "faas_function" | ||
| // OFFunctionMinReplicaCount is a label that user's can set and will be passed to Kubernetes | ||
| // as the Deployment replicas value. | ||
| OFFunctionMinReplicaCount = "com.openfaas.scale.min" | ||
| ) | ||
|
|
||
| // parseLabels will copy the user request labels and ensure that any required internal labels | ||
| // are set appropriately. | ||
| func parseLabels(functionName string, requestLables *map[string]string) map[string]string { | ||
| labels := map[string]string{} | ||
| if requestLables != nil { | ||
| for k, v := range *requestLables { | ||
| labels[k] = v | ||
| } | ||
| } | ||
|
|
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| labels[OFFunctionNameLabel] = functionName | ||
|
|
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| return labels | ||
| } | ||
|
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| // getMinReplicaCount extracts the functions minimum replica count from the user's | ||
| // request labels. If the value is not found, this will return the default value, 1. | ||
| func getMinReplicaCount(labels *map[string]string) *int32 { | ||
| if labels == nil { | ||
| return int32p(initialReplicasCount) | ||
| } | ||
|
|
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| l := *labels | ||
| if value, exists := l[OFFunctionMinReplicaCount]; exists { | ||
| minReplicas, err := strconv.Atoi(value) | ||
| if err == nil && minReplicas > 0 { | ||
| return int32p(int32(minReplicas)) | ||
| } | ||
|
|
||
| log.Println(err) | ||
| } | ||
|
|
||
| return int32p(initialReplicasCount) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package handlers | ||
|
|
||
| import "testing" | ||
|
|
||
| func Test_getMinReplicaCount(t *testing.T) { | ||
| scenarios := []struct { | ||
| name string | ||
| labels *map[string]string | ||
| output int | ||
| }{ | ||
| { | ||
| name: "nil map returns default", | ||
| labels: nil, | ||
| output: initialReplicasCount, | ||
| }, | ||
| { | ||
| name: "empty map returns default", | ||
| labels: &map[string]string{}, | ||
| output: initialReplicasCount, | ||
| }, | ||
| { | ||
| name: "empty map returns default", | ||
| labels: &map[string]string{OFFunctionMinReplicaCount: "2"}, | ||
| output: 2, | ||
| }, | ||
| } | ||
|
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| for _, s := range scenarios { | ||
| t.Run(s.name, func(t *testing.T) { | ||
| output := getMinReplicaCount(s.labels) | ||
| if output == nil { | ||
| t.Errorf("getMinReplicaCount should not return nil pointer") | ||
| } | ||
|
|
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| value := int(*output) | ||
| if value != s.output { | ||
| t.Errorf("expected: %d, got %d", s.output, value) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
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||
| func Test_parseLabels(t *testing.T) { | ||
| scenarios := []struct { | ||
| name string | ||
| labels *map[string]string | ||
| functionName string | ||
| output map[string]string | ||
| }{ | ||
| { | ||
| name: "nil map returns just the function name", | ||
| labels: nil, | ||
| functionName: "testFunc", | ||
| output: map[string]string{OFFunctionNameLabel: "testFunc"}, | ||
| }, | ||
| { | ||
| name: "empty map returns just the function name", | ||
| labels: &map[string]string{}, | ||
| functionName: "testFunc", | ||
| output: map[string]string{OFFunctionNameLabel: "testFunc"}, | ||
| }, | ||
| { | ||
| name: "non-empty map does not overwrite the function name label", | ||
| labels: &map[string]string{OFFunctionNameLabel: "anotherValue", "customLabel": "test"}, | ||
| functionName: "testFunc", | ||
| output: map[string]string{OFFunctionNameLabel: "testFunc", "customLabel": "test"}, | ||
| }, | ||
| } | ||
|
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||
| for _, s := range scenarios { | ||
| t.Run(s.name, func(t *testing.T) { | ||
| output := parseLabels(s.functionName, s.labels) | ||
| if output == nil { | ||
| t.Errorf("parseLabels should not return nil map") | ||
| } | ||
|
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| outputFuncName := output[OFFunctionNameLabel] | ||
| if outputFuncName != s.functionName { | ||
| t.Errorf("parseLabels should always set the function name: expected %s, got %s", s.functionName, outputFuncName) | ||
| } | ||
|
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| for key, value := range output { | ||
| expectedValue := s.output[key] | ||
| if value != expectedValue { | ||
| t.Errorf("Incorrect output label for %s, expected: %s, got %s", key, expectedValue, value) | ||
| } | ||
| } | ||
|
|
||
| }) | ||
| } | ||
| } |
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