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parameter.go
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parameter.go
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package eventline
import (
"bytes"
"encoding/json"
"fmt"
"regexp"
"github.com/exograd/eventline/pkg/utils"
"github.com/exograd/go-daemon/check"
)
var (
reParameterLabelRE = regexp.MustCompile(`_+`)
)
type ParameterType string
const (
ParameterTypeNumber ParameterType = "number"
ParameterTypeInteger ParameterType = "integer"
ParameterTypeString ParameterType = "string"
ParameterTypeBoolean ParameterType = "boolean"
)
var ParameterTypeValues = []ParameterType{
ParameterTypeNumber,
ParameterTypeInteger,
ParameterTypeString,
ParameterTypeBoolean,
}
type Parameter struct {
Name string `json:"name"`
Type ParameterType `json:"type"`
Values []string `json:"values,omitempty"`
Default interface{} `json:"-"`
RawDefault json.RawMessage `json:"default,omitempty"`
Description string `json:"description,omitempty"`
Environment string `json:"environment,omitempty"`
}
type Parameters []*Parameter
func (pp *Parameter) MarshalJSON() ([]byte, error) {
type Parameter2 Parameter
p := Parameter2(*pp)
def, err := json.Marshal(p.Default)
if err != nil {
return nil, fmt.Errorf("cannot encode parameters: %w", err)
}
p.RawDefault = def
return json.Marshal(p)
}
func (pp *Parameter) UnmarshalJSON(data []byte) error {
type Parameter2 Parameter
p := Parameter2(*pp)
if err := json.Unmarshal(data, &p); err != nil {
return err
}
if p.RawDefault != nil {
d := json.NewDecoder(bytes.NewReader(p.RawDefault))
d.DisallowUnknownFields()
d.UseNumber()
if err := d.Decode(&p.Default); err != nil {
return fmt.Errorf("invalid default: %w", err)
}
}
*pp = Parameter(p)
return nil
}
func (p *Parameter) Check(c *check.Checker) {
CheckName(c, "name", p.Name)
c.CheckStringValue("type", p.Type, ParameterTypeValues)
if p.Type != ParameterTypeString {
c.Check("values", len(p.Values) == 0, "unexpected_value",
"non-string parameters cannot have values")
}
if p.Default != nil {
switch p.Type {
case ParameterTypeNumber:
_, ok := p.Default.(json.Number)
c.Check("default", ok, "invalid_type",
"default value must be a number")
case ParameterTypeInteger:
var err error
number, ok := p.Default.(json.Number)
if ok {
_, err = number.Int64()
}
c.Check("default", ok && err == nil, "invalid_type",
"default value must be an integer")
case ParameterTypeString:
defaultString, isString := p.Default.(string)
c.Check("default", isString, "invalid_type",
"default value must be a string")
if p.Values != nil {
c.Check("default",
utils.StringsContain(p.Values, defaultString),
"invalid_value",
"default value is not one of the valid values")
}
case ParameterTypeBoolean:
_, isBool := p.Default.(bool)
c.Check("default", isBool, "invalid_type",
"default value must be a boolean")
}
}
}
func (ps Parameters) CheckValues(c *check.Checker, token string, values map[string]interface{}) {
c.WithChild(token, func() {
for name, value := range values {
param := ps.Parameter(name)
if param == nil {
// Ideally we would like to point at the key in the object,
// but JSON pointers can only target values.
c.AddError(name, "unknown_parameter", "unknown parameter")
continue
}
values[name] = param.CheckValue(c, name, value)
}
})
for _, p := range ps {
if _, found := values[p.Name]; !found {
if p.Default == nil {
c.AddError(token, "missing_parameter", "missing parameter %q",
p.Name)
} else {
values[p.Name] = p.Default
}
}
}
}
func (p *Parameter) CheckValue(c *check.Checker, token string, value interface{}) interface{} {
switch p.Type {
case ParameterTypeNumber:
return p.checkValueNumber(c, token, value)
case ParameterTypeInteger:
return p.checkValueInteger(c, token, value)
case ParameterTypeString:
return p.checkValueString(c, token, value)
case ParameterTypeBoolean:
return p.checkValueBoolean(c, token, value)
default:
utils.Panicf("unhandled parameter type %v", p.Type)
}
return nil
}
func (p *Parameter) checkValueNumber(c *check.Checker, token string, value interface{}) interface{} {
number, ok := value.(json.Number)
if !ok {
c.AddError(token, "invalid_number", "value is not a number")
return nil
}
if f64, err := number.Float64(); err == nil {
return f64
} else if i64, err := number.Int64(); err == nil {
return i64
}
// Not supposed to happen
c.AddError(token, "invalid_number", "value is not a number")
return nil
}
func (p *Parameter) checkValueInteger(c *check.Checker, token string, value interface{}) interface{} {
number, ok := value.(json.Number)
if !ok {
c.AddError(token, "invalid_integer", "value is not an integer")
return nil
}
i64, err := number.Int64()
if err != nil {
c.AddError(token, "invalid_integer", "value is not an integer")
return nil
}
return i64
}
func (p *Parameter) checkValueString(c *check.Checker, token string, value interface{}) interface{} {
s, ok := value.(string)
c.Check(token, ok, "invalid_string", "value is not a string")
if p.Values != nil {
c.CheckStringValue(token, s, p.Values)
}
return s
}
func (p *Parameter) checkValueBoolean(c *check.Checker, token string, value interface{}) interface{} {
b, ok := value.(bool)
c.Check(token, ok, "invalid_boolean", "value is not a boolean")
return b
}
func (ps Parameters) Parameter(name string) *Parameter {
for _, p := range ps {
if p.Name == name {
return p
}
}
return nil
}
func (p *Parameter) Label() string {
// Used in the form template
label := reParameterLabelRE.ReplaceAllString(p.Name, " ")
return utils.Capitalize(label)
}
func (p *Parameter) ValueString(value interface{}) (s string) {
switch p.Type {
case ParameterTypeNumber:
return fmt.Sprintf("%v", value)
case ParameterTypeInteger:
return fmt.Sprintf("%v", value)
case ParameterTypeString:
return value.(string)
case ParameterTypeBoolean:
if value.(bool) == true {
return "true"
} else {
return "false"
}
default:
utils.Panicf("unhandled parameter type %v", p.Type)
}
return
}