gfit/gfit.go

   1 package gfit
   2
   3 import (
   4         "context"
   5         "fmt"
   6         "net/http"
   7         "strings"
   8         "time"
   9
  10         "github.com/octo/gfitsync/app"
  11         "github.com/octo/gfitsync/fitbit"
  12         "golang.org/x/oauth2"
  13         oauth2google "golang.org/x/oauth2/google"
  14         fitness "google.golang.org/api/fitness/v1"
  15         "google.golang.org/api/googleapi"
  16         "google.golang.org/appengine"
  17         "google.golang.org/appengine/log"
  18 )
  19
  20 const (
  21         csrfToken = "@CSRFTOKEN@"
  22         userID    = "me"
  23
  24         dataTypeNameCalories  = "com.google.calories.expended"
  25         dataTypeNameDistance  = "com.google.distance.delta"
  26         dataTypeNameSteps     = "com.google.step_count.delta"
  27         dataTypeNameHeartrate = "com.google.heart_rate.summary"
  28 )
  29
  30 var oauthConfig = &oauth2.Config{
  31         ClientID:     "@GOOGLE_CLIENT_ID@",
  32         ClientSecret: "@GOOGLE_CLIENT_SECRET@",
  33         Endpoint:     oauth2google.Endpoint,
  34         RedirectURL:  "https://kraftakt.octo.it/google/grant",
  35         Scopes: []string{
  36                 fitness.FitnessActivityWriteScope,
  37                 fitness.FitnessBodyWriteScope,
  38                 fitness.FitnessLocationWriteScope,
  39         },
  40 }
  41
  42 func Application(ctx context.Context) *fitness.Application {
  43         return &fitness.Application{
  44                 Name:       "Fitbit to Google Fit sync",
  45                 Version:    appengine.VersionID(ctx),
  46                 DetailsUrl: "", // optional
  47         }
  48 }
  49
  50 func AuthURL() string {
  51         return oauthConfig.AuthCodeURL(csrfToken, oauth2.AccessTypeOffline)
  52 }
  53
  54 func ParseToken(ctx context.Context, r *http.Request, u *app.User) error {
  55         if state := r.FormValue("state"); state != csrfToken {
  56                 return fmt.Errorf("invalid state parameter: %q", state)
  57         }
  58
  59         tok, err := oauthConfig.Exchange(ctx, r.FormValue("code"))
  60         if err != nil {
  61                 return err
  62         }
  63
  64         return u.SetToken(ctx, "Google", tok)
  65 }
  66
  67 type Client struct {
  68         *fitness.Service
  69 }
  70
  71 func NewClient(ctx context.Context, u *app.User) (*Client, error) {
  72         c, err := u.OAuthClient(ctx, "Google", oauthConfig)
  73         if err != nil {
  74                 return nil, err
  75         }
  76
  77         service, err := fitness.New(c)
  78         if err != nil {
  79                 return nil, err
  80         }
  81
  82         return &Client{
  83                 Service: service,
  84         }, nil
  85 }
  86
  87 func DataStreamID(dataSource *fitness.DataSource) string {
  88         fields := []string{
  89                 dataSource.Type,
  90                 dataSource.DataType.Name,
  91                 "@PROJECT_NUMBER@", // FIXME
  92         }
  93
  94         if dev := dataSource.Device; dev != nil {
  95                 if dev.Manufacturer != "" {
  96                         fields = append(fields, dev.Manufacturer)
  97                 }
  98                 if dev.Model != "" {
  99                         fields = append(fields, dev.Model)
 100                 }
 101                 if dev.Uid != "" {
 102                         fields = append(fields, dev.Uid)
 103                 }
 104         }
 105
 106         return strings.Join(fields, ":")
 107 }
 108
 109 func (c *Client) DataSourceCreate(ctx context.Context, dataSource *fitness.DataSource) (string, error) {
 110         res, err := c.Service.Users.DataSources.Create(userID, dataSource).Context(ctx).Do()
 111         if err != nil {
 112                 if gerr, ok := err.(*googleapi.Error); ok && gerr.Code == http.StatusConflict {
 113                         if dataSource.DataStreamId != "" {
 114                                 return dataSource.DataStreamId, nil
 115                         }
 116                         return DataStreamID(dataSource), nil
 117                 }
 118                 log.Errorf(ctx, "c.Service.Users.DataSources.Create() = (%+v, %v)", res, err)
 119                 return "", err
 120         }
 121         return res.DataStreamId, nil
 122 }
 123
 124 func (c *Client) DataSetPatch(ctx context.Context, dataSourceID string, points []*fitness.DataPoint) error {
 125         startTimeNanos, endTimeNanos := int64(-1), int64(-1)
 126         for _, p := range points {
 127                 if startTimeNanos == -1 || startTimeNanos > p.StartTimeNanos {
 128                         startTimeNanos = p.StartTimeNanos
 129                 }
 130                 if endTimeNanos == -1 || endTimeNanos < p.EndTimeNanos {
 131                         endTimeNanos = p.EndTimeNanos
 132                 }
 133         }
 134         datasetID := fmt.Sprintf("%d-%d", startTimeNanos, endTimeNanos)
 135
 136         dataset := &fitness.Dataset{
 137                 DataSourceId:   dataSourceID,
 138                 MinStartTimeNs: startTimeNanos,
 139                 MaxEndTimeNs:   endTimeNanos,
 140                 Point:          points,
 141         }
 142
 143         _, err := c.Service.Users.DataSources.Datasets.Patch(userID, dataSourceID, datasetID, dataset).Context(ctx).Do()
 144         if err != nil {
 145                 log.Errorf(ctx, "c.Service.Users.DataSources.Datasets.Patch() = %v", err)
 146                 return err
 147         }
 148         return nil
 149 }
 150
 151 func (c *Client) SetDistance(ctx context.Context, meters float64, startOfDay time.Time) error {
 152         return c.updateCumulative(ctx,
 153                 &fitness.DataSource{
 154                         Application: Application(ctx),
 155                         DataType: &fitness.DataType{
 156                                 Field: []*fitness.DataTypeField{
 157                                         &fitness.DataTypeField{
 158                                                 Name:   "distance",
 159                                                 Format: "floatPoint",
 160                                         },
 161                                 },
 162                                 Name: dataTypeNameDistance,
 163                         },
 164                         Name: "Distance covered",
 165                         Type: "raw",
 166                 },
 167                 &fitness.Value{
 168                         FpVal: meters,
 169                 },
 170                 startOfDay)
 171 }
 172
 173 func (c *Client) SetSteps(ctx context.Context, totalSteps int, startOfDay time.Time) error {
 174         return c.updateCumulative(ctx,
 175                 &fitness.DataSource{
 176                         Application: Application(ctx),
 177                         DataType: &fitness.DataType{
 178                                 Field: []*fitness.DataTypeField{
 179                                         &fitness.DataTypeField{
 180                                                 Name:   "steps",
 181                                                 Format: "integer",
 182                                         },
 183                                 },
 184                                 Name: dataTypeNameSteps,
 185                         },
 186                         Name: "Step Count",
 187                         Type: "raw",
 188                 },
 189                 &fitness.Value{
 190                         IntVal: int64(totalSteps),
 191                 },
 192                 startOfDay)
 193 }
 194
 195 func (c *Client) SetCalories(ctx context.Context, totalCalories float64, startOfDay time.Time) error {
 196         return c.updateCumulative(ctx,
 197                 &fitness.DataSource{
 198                         Application: Application(ctx),
 199                         DataType: &fitness.DataType{
 200                                 Field: []*fitness.DataTypeField{
 201                                         &fitness.DataTypeField{
 202                                                 Name:   "calories",
 203                                                 Format: "floatPoint",
 204                                         },
 205                                 },
 206                                 Name: dataTypeNameCalories,
 207                         },
 208                         Name: "Calories expended",
 209                         Type: "raw",
 210                 },
 211                 &fitness.Value{
 212                         FpVal: totalCalories,
 213                 },
 214                 startOfDay)
 215 }
 216
 217 func (c *Client) updateCumulative(ctx context.Context, dataSource *fitness.DataSource, rawValue *fitness.Value, startOfDay time.Time) error {
 218         switch f := dataSource.DataType.Field[0].Format; f {
 219         case "integer":
 220                 if rawValue.IntVal == 0 {
 221                         return nil
 222                 }
 223         case "floatPoint":
 224                 if rawValue.FpVal == 0 {
 225                         return nil
 226                 }
 227         default:
 228                 return fmt.Errorf("unexpected data type field format %q", f)
 229         }
 230
 231         dataSourceID, err := c.DataSourceCreate(ctx, dataSource)
 232         if err != nil {
 233                 return err
 234         }
 235         dataSource.DataStreamId = dataSourceID
 236
 237         endOfDay := startOfDay.Add(24 * time.Hour).Add(-1 * time.Nanosecond)
 238         currValue, startTime, err := c.readCumulative(ctx, dataSource, startOfDay, endOfDay)
 239
 240         var diffValue fitness.Value
 241         if dataSource.DataType.Field[0].Format == "integer" {
 242                 if rawValue.IntVal == currValue.IntVal {
 243                         return nil
 244                 }
 245                 diffValue.IntVal = rawValue.IntVal - currValue.IntVal
 246                 if diffValue.IntVal < 0 {
 247                         log.Warningf(ctx, "stored value (%d) is larger than new value (%d); assuming count was reset", currValue.IntVal, rawValue.IntVal)
 248                         diffValue.IntVal = rawValue.IntVal
 249                 }
 250         } else { // if dataSource.DataType.Field[0].Format == "floatPoint"
 251                 if rawValue.FpVal == currValue.FpVal {
 252                         return nil
 253                 }
 254                 diffValue.FpVal = rawValue.FpVal - currValue.FpVal
 255                 if diffValue.FpVal < 0 {
 256                         log.Warningf(ctx, "stored value (%g) is larger than new value (%g); assuming count was reset", currValue.FpVal, rawValue.FpVal)
 257                         diffValue.FpVal = rawValue.FpVal
 258                 }
 259         }
 260
 261         endTime := endOfDay
 262         if now := time.Now().In(startOfDay.Location()); now.Before(endOfDay) {
 263                 endTime = now
 264         }
 265         log.Debugf(ctx, "adding cumulative data point: %v-%v %+v", startTime, endTime, diffValue)
 266
 267         return c.DataSetPatch(ctx, dataSource.DataStreamId, []*fitness.DataPoint{
 268                 &fitness.DataPoint{
 269                         DataTypeName:   dataSource.DataType.Name,
 270                         StartTimeNanos: startTime.UnixNano(),
 271                         EndTimeNanos:   endTime.UnixNano(),
 272                         Value:          []*fitness.Value{&diffValue},
 273                 },
 274         })
 275 }
 276
 277 func (c *Client) readCumulative(ctx context.Context, dataSource *fitness.DataSource, startTime, endTime time.Time) (*fitness.Value, time.Time, error) {
 278         datasetID := fmt.Sprintf("%d-%d", startTime.UnixNano(), endTime.UnixNano())
 279
 280         res, err := c.Service.Users.DataSources.Datasets.Get(userID, dataSource.DataStreamId, datasetID).Context(ctx).Do()
 281         if err != nil {
 282                 log.Errorf(ctx, "c.Service.Users.DataSources.Datasets.Get(%q, %q) = %v", dataSource.DataStreamId, datasetID, err)
 283                 return nil, time.Time{}, err
 284         }
 285
 286         if len(res.Point) == 0 {
 287                 return &fitness.Value{}, startTime, nil
 288         }
 289
 290         var sum fitness.Value
 291         maxEndTime := startTime
 292         for _, p := range res.Point {
 293                 switch f := dataSource.DataType.Field[0].Format; f {
 294                 case "integer":
 295                         sum.IntVal += p.Value[0].IntVal
 296                 case "floatPoint":
 297                         sum.FpVal += p.Value[0].FpVal
 298                 default:
 299                         return nil, time.Time{}, fmt.Errorf("unexpected data type field format %q", f)
 300                 }
 301
 302                 pointEndTime := time.Unix(0, p.EndTimeNanos).In(startTime.Location())
 303                 if maxEndTime.Before(pointEndTime) {
 304                         maxEndTime = pointEndTime
 305                 }
 306         }
 307
 308         log.Debugf(ctx, "read cumulative data %s until %v: %+v", dataSource.DataStreamId, maxEndTime, sum)
 309         return &sum, maxEndTime, nil
 310 }
 311
 312 type heartRateDuration struct {
 313         Min      int
 314         Max      int
 315         Duration time.Duration
 316 }
 317
 318 type heartRateDurations []*heartRateDuration
 319
 320 func (res heartRateDurations) find(min, max int) (*heartRateDuration, bool) {
 321         for _, d := range res {
 322                 if d.Min != min || d.Max != max {
 323                         continue
 324                 }
 325                 return d, true
 326         }
 327
 328         return nil, false
 329 }
 330
 331 func (c *Client) heartRate(ctx context.Context, dataSource *fitness.DataSource, startTime, endTime time.Time) (heartRateDurations, time.Time, error) {
 332         datasetID := fmt.Sprintf("%d-%d", startTime.UnixNano(), endTime.UnixNano())
 333
 334         res, err := c.Service.Users.DataSources.Datasets.Get(userID, dataSource.DataStreamId, datasetID).Context(ctx).Do()
 335         if err != nil {
 336                 log.Errorf(ctx, "c.Service.Users.DataSources.Datasets.Get(%q, %q) = %v", dataSource.DataStreamId, datasetID, err)
 337                 return nil, time.Time{}, err
 338         }
 339
 340         if len(res.Point) == 0 {
 341                 return nil, startTime, nil
 342         }
 343
 344         var results heartRateDurations
 345         maxEndTime := startTime
 346         for _, p := range res.Point {
 347                 max := int(p.Value[1].FpVal)
 348                 min := int(p.Value[2].FpVal)
 349                 duration := time.Unix(0, p.EndTimeNanos).Sub(time.Unix(0, p.StartTimeNanos))
 350
 351                 if d, ok := results.find(min, max); ok {
 352                         d.Duration += duration
 353                 } else {
 354                         results = append(results, &heartRateDuration{
 355                                 Min:      min,
 356                                 Max:      max,
 357                                 Duration: duration,
 358                         })
 359                 }
 360
 361                 pointEndTime := time.Unix(0, p.EndTimeNanos).In(startTime.Location())
 362                 if maxEndTime.Before(pointEndTime) {
 363                         maxEndTime = pointEndTime
 364                 }
 365         }
 366
 367         return results, maxEndTime, nil
 368 }
 369
 370 func (c *Client) SetHeartRate(ctx context.Context, totalDurations []fitbit.HeartRateZone, restingHeartRate int, startOfDay time.Time) error {
 371         dataSource := &fitness.DataSource{
 372                 Application: Application(ctx),
 373                 DataType: &fitness.DataType{
 374                         Field: []*fitness.DataTypeField{
 375                                 &fitness.DataTypeField{
 376                                         Name:   "average",
 377                                         Format: "floatPoint",
 378                                 },
 379                                 &fitness.DataTypeField{
 380                                         Name:   "max",
 381                                         Format: "floatPoint",
 382                                 },
 383                                 &fitness.DataTypeField{
 384                                         Name:   "min",
 385                                         Format: "floatPoint",
 386                                 },
 387                         },
 388                         Name: dataTypeNameHeartrate,
 389                 },
 390                 Name: "Heart rate summary",
 391                 Type: "raw",
 392         }
 393
 394         dataSourceID, err := c.DataSourceCreate(ctx, dataSource)
 395         if err != nil {
 396                 return err
 397         }
 398         dataSource.DataStreamId = dataSourceID
 399
 400         endOfDay := startOfDay.Add(24 * time.Hour).Add(-1 * time.Nanosecond)
 401         prevDurations, startTime, err := c.heartRate(ctx, dataSource, startOfDay, endOfDay)
 402
 403         // calculate the difference between the durations mentioned in
 404         // totalDurations and prevDurations and store it in diffDurations.
 405         var diffDurations heartRateDurations
 406         for _, d := range totalDurations {
 407                 total := time.Duration(d.Minutes) * time.Minute
 408
 409                 var prev time.Duration
 410                 if res, ok := prevDurations.find(d.Min, d.Max); ok {
 411                         prev = res.Duration
 412                 }
 413
 414                 diff := total - prev
 415                 if diff < 0 {
 416                         diff = total
 417                 }
 418
 419                 if res, ok := diffDurations.find(d.Min, d.Max); ok {
 420                         res.Duration += diff
 421                 } else {
 422                         diffDurations = append(diffDurations, &heartRateDuration{
 423                                 Min:      d.Min,
 424                                 Max:      d.Max,
 425                                 Duration: diff,
 426                         })
 427                 }
 428         }
 429
 430         // create a fitness.DataPoint for each non-zero duration difference.
 431         var dataPoints []*fitness.DataPoint
 432         for _, d := range diffDurations {
 433                 if d.Duration < time.Nanosecond {
 434                         continue
 435                 }
 436
 437                 endTime := startTime.Add(d.Duration)
 438                 if endTime.After(endOfDay) {
 439                         log.Warningf(ctx, "heart rate durations exceed one day (current end time: %v)", endTime)
 440                         break
 441                 }
 442
 443                 average := float64(d.Min+d.Max) / 2.0
 444                 if d.Min <= restingHeartRate && restingHeartRate <= d.Max {
 445                         average = float64(restingHeartRate)
 446                 }
 447
 448                 dataPoints = append(dataPoints, &fitness.DataPoint{
 449                         DataTypeName:   dataSource.DataType.Name,
 450                         StartTimeNanos: startTime.UnixNano(),
 451                         EndTimeNanos:   endTime.UnixNano(),
 452                         Value: []*fitness.Value{
 453                                 &fitness.Value{
 454                                         FpVal: average,
 455                                 },
 456                                 &fitness.Value{
 457                                         FpVal: float64(d.Max),
 458                                 },
 459                                 &fitness.Value{
 460                                         FpVal: float64(d.Min),
 461                                 },
 462                         },
 463                 })
 464
 465                 startTime = endTime
 466         }
 467
 468         if len(dataPoints) == 0 {
 469                 return nil
 470         }
 471         return c.DataSetPatch(ctx, dataSource.DataStreamId, dataPoints)
 472 }