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parameter_mapping.go
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/
parameter_mapping.go
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// Copyright 2019 Aporeto Inc.
// Licensed 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 spec
import (
"bytes"
"io"
"os"
"sort"
yaml "gopkg.in/yaml.v2"
)
// ParameterType represents the various type for a parameter.
type ParameterType string
// Various values for ParameterType.
const (
ParameterTypeString ParameterType = "string"
ParameterTypeInt ParameterType = "integer"
ParameterTypeFloat ParameterType = "float"
ParameterTypeBool ParameterType = "boolean"
ParameterTypeTime ParameterType = "time"
ParameterTypeEnum ParameterType = "enum"
ParameterTypeDuration ParameterType = "duration"
)
// A ParameterMapping is a list parameter mapping
type ParameterMapping map[string]*ParameterDefinition
// NewParameterMapping returns a new ParameterMapping.
func NewParameterMapping() ParameterMapping {
return ParameterMapping{}
}
// LoadGlobalParameters loads the global parameters file.
func LoadGlobalParameters(path string) (ParameterMapping, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close() // nolint: errcheck
pm := ParameterMapping{}
if err = pm.Read(file, true); err != nil {
return nil, err
}
return pm, nil
}
// Read loads a validation mapping from the given io.Reader
func (p ParameterMapping) Read(reader io.Reader, validate bool) (err error) {
decoder := yaml.NewDecoder(reader)
decoder.SetStrict(true)
if err = decoder.Decode(&p); err != nil {
return err
}
if validate {
if errs := p.Validate(); len(errs) != 0 {
return formatValidationErrors(errs)
}
}
return nil
}
// Write dumps the specification into a []byte.
func (p ParameterMapping) Write(writer io.Writer) error {
repr := yaml.MapSlice{}
keys := make([]string, len(p))
var i int
for k := range p {
keys[i] = k
i++
}
sort.Strings(keys)
for _, k := range keys {
repr = append(repr, yaml.MapItem{
Key: k,
Value: p[k],
})
}
data, err := yaml.Marshal(repr)
if err != nil {
return err
}
buf := &bytes.Buffer{}
prfx1 := []byte(" - name: ")
prfx2 := []byte(" entries:")
lines := bytes.Split(data, []byte("\n"))
var previousLine []byte
for i, line := range lines {
condFirstLine := i == 0
if !condFirstLine &&
(len(line) > 0 && line[0] != ' ') ||
(bytes.HasPrefix(line, prfx1) && !bytes.HasPrefix(previousLine, prfx2)) {
buf.WriteRune('\n')
}
buf.Write(line)
if i+1 < len(lines) {
buf.WriteRune('\n')
}
previousLine = line
}
_, err = writer.Write(buf.Bytes())
return err
}
// Validate the ParameterMapping
func (p ParameterMapping) Validate() []error {
var errs []error
for _, v := range p {
if err := v.Validate("_parameter.mapping"); err != nil {
errs = append(errs, err...)
}
}
return errs
}