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package dashdiffs
import (
"encoding/json"
"errors"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/models"
diff "github.com/yudai/gojsondiff"
deltaFormatter "github.com/yudai/gojsondiff/formatter"
)
var (
// ErrUnsupportedDiffType occurs when an invalid diff type is used.
ErrUnsupportedDiffType = errors.New("dashdiff: unsupported diff type")
// ErrNilDiff occurs when two compared interfaces are identical.
ErrNilDiff = errors.New("dashdiff: diff is nil")
)
type DiffType int
const (
DiffJSON DiffType = iota
DiffBasic
DiffDelta
)
type Options struct {
OrgId int64
Base DiffTarget
New DiffTarget
DiffType DiffType
}
type DiffTarget struct {
DashboardId int64
Version int
UnsavedDashboard *simplejson.Json
}
type Result struct {
Delta []byte `json:"delta"`
}
func ParseDiffType(diff string) DiffType {
switch diff {
case "json":
return DiffJSON
case "basic":
return DiffBasic
case "delta":
return DiffDelta
}
return DiffBasic
}
// CompareDashboardVersionsCommand computes the JSON diff of two versions,
// assigning the delta of the diff to the `Delta` field.
func CalculateDiff(options *Options) (*Result, error) {
baseVersionQuery := models.GetDashboardVersionQuery{
DashboardId: options.Base.DashboardId,
Version: options.Base.Version,
OrgId: options.OrgId,
}
if err := bus.Dispatch(&baseVersionQuery); err != nil {
return nil, err
}
newVersionQuery := models.GetDashboardVersionQuery{
DashboardId: options.New.DashboardId,
Version: options.New.Version,
OrgId: options.OrgId,
}
if err := bus.Dispatch(&newVersionQuery); err != nil {
return nil, err
}
baseData := baseVersionQuery.Result.Data
newData := newVersionQuery.Result.Data
left, jsonDiff, err := getDiff(baseData, newData)
if err != nil {
return nil, err
}
result := &Result{}
switch options.DiffType {
case DiffDelta:
deltaOutput, err := deltaFormatter.NewDeltaFormatter().Format(jsonDiff)
if err != nil {
return nil, err
}
result.Delta = []byte(deltaOutput)
case DiffJSON:
jsonOutput, err := NewJSONFormatter(left).Format(jsonDiff)
if err != nil {
return nil, err
}
result.Delta = []byte(jsonOutput)
case DiffBasic:
basicOutput, err := NewBasicFormatter(left).Format(jsonDiff)
if err != nil {
return nil, err
}
result.Delta = basicOutput
default:
return nil, ErrUnsupportedDiffType
}
return result, nil
}
// getDiff computes the diff of two dashboard versions.
func getDiff(baseData, newData *simplejson.Json) (interface{}, diff.Diff, error) {
leftBytes, err := baseData.Encode()
if err != nil {
return nil, nil, err
}
rightBytes, err := newData.Encode()
if err != nil {
return nil, nil, err
}
jsonDiff, err := diff.New().Compare(leftBytes, rightBytes)
if err != nil {
return nil, nil, err
}
if !jsonDiff.Modified() {
return nil, nil, ErrNilDiff
}
left := make(map[string]interface{})
err = json.Unmarshal(leftBytes, &left)
if err != nil {
return nil, nil, err
}
return left, jsonDiff, nil
}
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