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package context
import (
"encoding/json"
"fmt"
"io/ioutil"
"path"
"strings"
"github.com/ghodss/yaml"
"github.com/polydawn/meep"
)
type ResourceSet struct {
Name string `json:"name"`
Values map[string]interface{} `json:"values"`
}
type Context struct {
Name string `json:"context"`
Global map[string]interface{} `json:"global"`
ResourceSets []ResourceSet `json:"include"`
BaseDir string
}
type ContextLoadingError struct {
meep.AllTraits
Filename string
}
// Attempt to load and deserialise a Context from the specified file.
func LoadContextFromFile(filename string) (*Context, error) {
file, err := ioutil.ReadFile(filename)
if err != nil {
return nil, meep.New(
&ContextLoadingError{Filename: filename},
meep.Cause(err),
)
}
var c Context
if strings.HasSuffix(filename, "json") {
err = json.Unmarshal(file, &c)
} else if strings.HasSuffix(filename, "yaml") || strings.HasSuffix(filename, "yml") {
err = yaml.Unmarshal(file, &c)
} else {
return nil, meep.New(
&ContextLoadingError{Filename: filename},
meep.Cause(fmt.Errorf("File format not supported. Must be JSON or YAML.")),
)
}
if err != nil {
return nil, meep.New(
&ContextLoadingError{Filename: filename},
meep.Cause(err),
)
}
c.BaseDir = path.Dir(filename)
return &c, nil
}
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