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endpoints.go
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endpoints.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"github.com/alexandre-normand/glukit/app/apimodel"
"github.com/alexandre-normand/glukit/app/engine"
"github.com/alexandre-normand/glukit/app/model"
"github.com/alexandre-normand/glukit/app/payment"
"github.com/alexandre-normand/glukit/app/store"
"github.com/alexandre-normand/glukit/app/util"
"github.com/grd/stat"
"google.golang.org/appengine"
"google.golang.org/appengine/log"
"google.golang.org/appengine/user"
"net/http"
"sort"
"strconv"
"time"
)
// Represents a DataResponse with an array of DataSeries and some metadata
type DataResponse struct {
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
Picture string `json:"picture"`
LastSync time.Time `json:"lastSync"`
Score *int64 `json:"score"`
ScoreDetails model.GlukitScore `json:"scoreDetails"`
JoinedOn time.Time `json:"joinedOn"`
Data []DataSeries `json:"data"`
Trend string `json:"trend"`
}
// Represents a generic DataSeries structure with a series of DataPoints
type DataSeries struct {
Name string `json:"name"`
Data []apimodel.DataPoint `json:"data"`
Type string `json:"type"`
}
const (
QUERY_PARAM_LIMIT = "limit"
QUERY_PARAM_FROM = "from"
QUERY_PARAM_TO = "to"
)
// content renders the most recent day's worth of data as json for the active user
func personalData(writer http.ResponseWriter, request *http.Request) {
context := appengine.NewContext(request)
user := user.Current(context)
mostRecentWeekAsJson(writer, request, user.Email)
}
// demoContent renders the most recent day's worth of data as json for the demo user
func demoContent(writer http.ResponseWriter, request *http.Request) {
mostRecentWeekAsJson(writer, request, DEMO_EMAIL)
}
// mostRecentWeekAsJson retrieves the most recent day's week worth of data for the user identified by
// the given email address and writes to the response writer as json
func mostRecentWeekAsJson(writer http.ResponseWriter, request *http.Request, email string) {
context := appengine.NewContext(request)
glukitUser, _, upperBound, err := store.GetUserData(context, email)
lowerBound := util.GetEndOfDayBoundaryBefore(upperBound).Add(model.DEFAULT_LOOKBACK_PERIOD)
if err != nil && err == store.ErrNoImportedDataFound {
log.Debugf(context, "No imported data found for user [%s]", email)
http.Error(writer, err.Error(), 204)
} else if err != nil {
util.Propagate(err)
} else {
unitValue, err := resolveGlucoseUnit(email, request)
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
reads, err := store.GetGlucoseReads(context, email, lowerBound, upperBound)
if err != nil {
util.Propagate(err)
}
injections, err := store.GetInjections(context, email, lowerBound, upperBound)
if err != nil {
util.Propagate(err)
}
carbs, err := store.GetMeals(context, email, lowerBound, upperBound)
if err != nil {
util.Propagate(err)
}
exercises, err := store.GetExercises(context, email, lowerBound, upperBound)
if err != nil {
util.Propagate(err)
}
value := writer.Header()
value.Add("Content-type", "application/json")
response := DataResponse{FirstName: glukitUser.FirstName, LastName: glukitUser.LastName, Picture: glukitUser.PictureUrl, LastSync: glukitUser.MostRecentRead.GetTime(), Score: engine.CalculateUserFacingScore(glukitUser.MostRecentScore), ScoreDetails: glukitUser.MostRecentScore, JoinedOn: glukitUser.AccountCreated, Data: generateDataSeriesFromData(reads, injections, carbs, exercises, *unitValue)}
writeAsJson(writer, response)
}
}
// find the steady sailor and retrieve his most recent day's worth of data.
func steadySailorData(writer http.ResponseWriter, request *http.Request) {
context := appengine.NewContext(request)
user := user.Current(context)
steadySailorDataForEmail(writer, request, user.Email)
}
// find the steady sailor for the demo user and retrieve his most recent day's worth of data.
func demoSteadySailorData(writer http.ResponseWriter, request *http.Request) {
steadySailorDataForEmail(writer, request, DEMO_EMAIL)
}
// find the steady sailor and retrieve his most recent day's worth of data.
func steadySailorDataForEmail(writer http.ResponseWriter, request *http.Request, recipientEmail string) {
context := appengine.NewContext(request)
steadySailor, _, upperBound, err := store.FindSteadySailor(context, recipientEmail)
// Overscan by a day so that we have enough data to cover for a partial day of the user's data
lowerBound := upperBound.Add(model.DEFAULT_LOOKBACK_PERIOD + time.Duration(-24)*time.Hour)
if err != nil && err == store.ErrNoSteadySailorMatchFound {
log.Debugf(context, "No steady sailor match found for user [%s]", recipientEmail)
http.Error(writer, err.Error(), 204)
} else if err != nil {
util.Propagate(err)
} else {
unitValue, err := resolveGlucoseUnit(recipientEmail, request)
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
reads, err := store.GetGlucoseReads(context, steadySailor.Email, lowerBound, upperBound)
if err != nil {
util.Propagate(err)
}
value := writer.Header()
value.Add("Content-type", "application/json")
response := DataResponse{FirstName: steadySailor.FirstName, LastName: steadySailor.LastName, Picture: steadySailor.PictureUrl, LastSync: steadySailor.MostRecentRead.GetTime(), Score: engine.CalculateUserFacingScore(steadySailor.MostRecentScore), ScoreDetails: steadySailor.MostRecentScore, JoinedOn: steadySailor.AccountCreated, Data: generateDataSeriesFromData(reads, nil, nil, nil, *unitValue)}
writeAsJson(writer, response)
}
}
// writeAsJson writes a DataResponse with its set of GlucoseReads, Injections, Meals and Exercises as json. This is what is called from the javascript
// front-end to get the data.
func writeAsJson(writer http.ResponseWriter, response DataResponse) {
enc := json.NewEncoder(writer)
enc.Encode(response)
}
func generateDataSeriesFromData(reads []apimodel.GlucoseRead, injections []apimodel.Injection, carbs []apimodel.Meal, exercises []apimodel.Exercise, glucoseUnit apimodel.GlucoseUnit) (dataSeries []DataSeries) {
data := make([]DataSeries, 1)
data[0] = DataSeries{"GlucoseReads", apimodel.GlucoseReadSlice(reads).ToDataPointSlice(glucoseUnit), "GlucoseReads"}
var userEvents []apimodel.DataPoint
if injections != nil {
userEvents = apimodel.MergeDataPointArrays(userEvents, apimodel.InjectionSlice(injections).ToDataPointSlice(reads, glucoseUnit))
}
if carbs != nil {
userEvents = apimodel.MergeDataPointArrays(userEvents, apimodel.MealSlice(carbs).ToDataPointSlice(reads, glucoseUnit))
}
// TODO: clean up exercise from all the app or restore it. We won't be using it at the moment as we don't think the exercise data
// from the dexcom is good enough
// if exercises != nil {
// userEvents = apimodel.MergeDataPointArrays(userEvents, apimodel.ExerciseSlice(exercises).ToDataPointSlice(reads))
// }
sort.Sort(apimodel.DataPointSlice(userEvents))
data = append(data, DataSeries{"UserEvents", userEvents, "UserEvents"})
return data
}
// dashboard renders the dashboard statistics as json
func dashboard(writer http.ResponseWriter, request *http.Request) {
context := appengine.NewContext(request)
user := user.Current(context)
dashboardDataForUser(writer, request, user.Email)
}
// demodashboard renders the dashboard statistics as json for the demo user
func demoDashboard(writer http.ResponseWriter, request *http.Request) {
dashboardDataForUser(writer, request, DEMO_EMAIL)
}
// dashboardDataForUser retrieves reads and generates dashboard statistics from them
func dashboardDataForUser(writer http.ResponseWriter, request *http.Request, email string) {
context := appengine.NewContext(request)
_, _, upperBound, err := store.GetUserData(context, email)
lowerBound := util.GetEndOfDayBoundaryBefore(upperBound).Add(time.Duration(-1*24) * time.Hour)
if err != nil && err == store.ErrNoImportedDataFound {
log.Debugf(context, "No imported data found for user [%s]", email)
http.Error(writer, err.Error(), 204)
} else if err != nil {
util.Propagate(err)
} else {
reads, err := store.GetGlucoseReads(context, email, lowerBound, upperBound)
if err != nil {
util.Propagate(err)
}
writeDashboardDataAsJson(writer, request, reads)
}
}
// writedashboardDataAsJson calculates dashboard statistics from an array of GlucoseReads and writes it
// as json
func writeDashboardDataAsJson(writer http.ResponseWriter, request *http.Request, reads []apimodel.GlucoseRead) {
value := writer.Header()
value.Add("Content-type", "application/json")
var dashboardData model.DashboardData
if len(reads) > 0 {
sort.Sort(model.ReadStatsSlice(reads))
dashboardData.Average = stat.Mean(model.ReadStatsSlice(reads))
dashboardData.High, _ = stat.Max(model.ReadStatsSlice(reads))
dashboardData.Low, _ = stat.Min(model.ReadStatsSlice(reads))
dashboardData.Median = stat.MedianFromSortedData(model.ReadStatsSlice(reads))
}
enc := json.NewEncoder(writer)
enc.Encode(dashboardData)
}
func glukitScores(writer http.ResponseWriter, request *http.Request) {
context := appengine.NewContext(request)
user := user.Current(context)
glukitScoresForEmail(writer, request, user.Email)
}
func glukitScoresForDemo(writer http.ResponseWriter, request *http.Request) {
glukitScoresForEmail(writer, request, DEMO_EMAIL)
}
// glukitScoresForEmail is the endpoint to retrieve a list of glukitscores.
func glukitScoresForEmail(writer http.ResponseWriter, request *http.Request, email string) {
context := appengine.NewContext(request)
scanQuery, err := newScanQuery(request)
if err != nil {
http.Error(writer, err.Error(), 400)
return
}
glukitScores, err := store.GetGlukitScores(context, email, *scanQuery)
if err != nil {
util.Propagate(err)
}
if len(glukitScores) < 1 {
http.Error(writer, "No glukit scores calculated yet.", 204)
return
}
value := writer.Header()
value.Add("Content-type", "application/json")
enc := json.NewEncoder(writer)
enc.Encode(glukitScores)
}
func a1cEstimates(writer http.ResponseWriter, request *http.Request) {
context := appengine.NewContext(request)
user := user.Current(context)
a1csForEmail(writer, request, user.Email)
}
func a1cEstimatesForDemo(writer http.ResponseWriter, request *http.Request) {
a1csForEmail(writer, request, DEMO_EMAIL)
}
// a1cs is the endpoint to retrieve a list of a1cs.
func a1csForEmail(writer http.ResponseWriter, request *http.Request, email string) {
context := appengine.NewContext(request)
scanQuery, err := newScanQuery(request)
if err != nil {
http.Error(writer, err.Error(), 400)
return
}
a1cs, err := store.GetA1CEstimates(context, email, *scanQuery)
if err != nil {
util.Propagate(err)
}
if len(a1cs) < 1 {
http.Error(writer, "No a1c estimated yet.", 204)
return
}
value := writer.Header()
value.Add("Content-type", "application/json")
enc := json.NewEncoder(writer)
enc.Encode(a1cs)
}
func newScanQuery(request *http.Request) (scanQuery *store.ScoreScanQuery, err error) {
limit := request.FormValue(QUERY_PARAM_LIMIT)
fromTimestamp := request.FormValue(QUERY_PARAM_FROM)
toTimestamp := request.FormValue(QUERY_PARAM_TO)
scanQuery = new(store.ScoreScanQuery)
// The request must include at least one of from/to/limit to be considered valid
// as leaving it too open would could open the door for costly queries
if len(limit) == 0 && len(fromTimestamp) == 0 && len(toTimestamp) == 0 {
return nil, errors.New(fmt.Sprintf("Query must specify at least one of: %s, %s or %s.",
QUERY_PARAM_LIMIT, QUERY_PARAM_FROM, QUERY_PARAM_TO))
}
if len(limit) > 0 {
if limitValue, err := strconv.ParseInt(limit, 10, 32); err != nil {
return nil, errors.New(fmt.Sprintf("Invalid value for %s: [%v].", QUERY_PARAM_LIMIT, err))
} else {
limitVal := int(limitValue)
scanQuery.Limit = &limitVal
}
}
if len(fromTimestamp) > 0 {
if fromValue, err := strconv.ParseInt(fromTimestamp, 10, 64); err != nil {
return nil, errors.New(fmt.Sprintf("Invalid value for %s: [%v].", QUERY_PARAM_FROM, err))
} else {
fromTime := time.Unix(fromValue, 0)
scanQuery.From = &fromTime
}
}
if len(toTimestamp) > 0 {
if toValue, err := strconv.ParseInt(toTimestamp, 10, 64); err != nil {
return nil, errors.New(fmt.Sprintf("Invalid value for %s: [%v].", QUERY_PARAM_TO, err))
} else {
toTime := time.Unix(toValue, 0)
scanQuery.To = &toTime
}
}
return scanQuery, nil
}
func handleDonation(writer http.ResponseWriter, request *http.Request) {
context := appengine.NewContext(request)
user := user.Current(context)
request.ParseForm()
token := request.FormValue(payment.STRIPE_TOKEN)
amountInCentsVal := request.FormValue(payment.DONATION_AMOUNT)
stripeClient := payment.NewStripeClient(appConfig)
err := stripeClient.SubmitDonation(context, token, amountInCentsVal)
if err != nil {
log.Warningf(context, "Error processing donation from [%v] of [%d] cents with token [%s]: [%v]", user, amountInCentsVal, token, err)
writer.WriteHeader(502)
} else {
writer.WriteHeader(200)
}
}