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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"math"
"net"
"sync"
"time"
"github.com/golang/protobuf/proto"
"github.com/kpacha/krakend-grpc-gateway-post/generated/routeguide"
grpc "google.golang.org/grpc"
)
type routeGuideServer struct {
savedFeatures []*routeguide.Feature // read-only after initialized
mu sync.Mutex // protects routeNotes
routeNotes map[string][]*routeguide.RouteNote
}
// GetFeature returns the feature at the given point.
func (s *routeGuideServer) GetFeature(ctx context.Context, point *routeguide.Point) (*routeguide.Feature, error) {
for _, feature := range s.savedFeatures {
if proto.Equal(feature.Location, point) {
return feature, nil
}
}
// No feature was found, return an unnamed feature
return &routeguide.Feature{Location: point}, nil
}
// ListFeatures lists all features contained within the given bounding Rectangle.
func (s *routeGuideServer) ListFeatures(rect *routeguide.Rectangle, stream routeguide.RouteGuide_ListFeaturesServer) error {
for _, feature := range s.savedFeatures {
if inRange(feature.Location, rect) {
if err := stream.Send(feature); err != nil {
return err
}
}
}
return nil
}
// RecordRoute records a route composited of a sequence of points.
//
// It gets a stream of points, and responds with statistics about the "trip":
// number of points, number of known features visited, total distance traveled, and
// total time spent.
func (s *routeGuideServer) RecordRoute(stream routeguide.RouteGuide_RecordRouteServer) error {
var pointCount, featureCount, distance int32
var lastPoint *routeguide.Point
startTime := time.Now()
for {
point, err := stream.Recv()
if err == io.EOF {
endTime := time.Now()
return stream.SendAndClose(&routeguide.RouteSummary{
PointCount: pointCount,
FeatureCount: featureCount,
Distance: distance,
ElapsedTime: int32(endTime.Sub(startTime).Seconds()),
})
}
if err != nil {
return err
}
pointCount++
for _, feature := range s.savedFeatures {
if proto.Equal(feature.Location, point) {
featureCount++
}
}
if lastPoint != nil {
distance += calcDistance(lastPoint, point)
}
lastPoint = point
}
}
// RouteChat receives a stream of message/location pairs, and responds with a stream of all
// previous messages at each of those locations.
func (s *routeGuideServer) RouteChat(stream routeguide.RouteGuide_RouteChatServer) error {
for {
in, err := stream.Recv()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
key := serialize(in.Location)
s.mu.Lock()
s.routeNotes[key] = append(s.routeNotes[key], in)
// Note: this copy prevents blocking other clients while serving this one.
// We don't need to do a deep copy, because elements in the slice are
// insert-only and never modified.
rn := make([]*routeguide.RouteNote, len(s.routeNotes[key]))
copy(rn, s.routeNotes[key])
s.mu.Unlock()
for _, note := range rn {
if err := stream.Send(note); err != nil {
return err
}
}
}
}
// loadFeatures loads features from a JSON file.
func (s *routeGuideServer) loadFeatures(filePath string) {
var data []byte
if filePath != "" {
var err error
data, err = ioutil.ReadFile(filePath)
if err != nil {
log.Fatalf("Failed to load default features: %v", err)
}
} else {
data = exampleData
}
if err := json.Unmarshal(data, &s.savedFeatures); err != nil {
log.Fatalf("Failed to load default features: %v", err)
}
}
func toRadians(num float64) float64 {
return num * math.Pi / float64(180)
}
// calcDistance calculates the distance between two points using the "haversine" formula.
// The formula is based on http://mathforum.org/library/drmath/view/51879.html.
func calcDistance(p1 *routeguide.Point, p2 *routeguide.Point) int32 {
const CordFactor float64 = 1e7
const R = float64(6371000) // earth radius in metres
lat1 := toRadians(float64(p1.Latitude) / CordFactor)
lat2 := toRadians(float64(p2.Latitude) / CordFactor)
lng1 := toRadians(float64(p1.Longitude) / CordFactor)
lng2 := toRadians(float64(p2.Longitude) / CordFactor)
dlat := lat2 - lat1
dlng := lng2 - lng1
a := math.Sin(dlat/2)*math.Sin(dlat/2) +
math.Cos(lat1)*math.Cos(lat2)*
math.Sin(dlng/2)*math.Sin(dlng/2)
c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
distance := R * c
return int32(distance)
}
func inRange(point *routeguide.Point, rect *routeguide.Rectangle) bool {
left := math.Min(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
right := math.Max(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
top := math.Max(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
bottom := math.Min(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
if float64(point.Longitude) >= left &&
float64(point.Longitude) <= right &&
float64(point.Latitude) >= bottom &&
float64(point.Latitude) <= top {
return true
}
return false
}
func serialize(point *routeguide.Point) string {
return fmt.Sprintf("%d %d", point.Latitude, point.Longitude)
}
func newServer() *routeGuideServer {
s := &routeGuideServer{routeNotes: make(map[string][]*routeguide.RouteNote)}
s.loadFeatures(*jsonDBFile)
return s
}
var (
jsonDBFile = flag.String("json_db_file", "", "A json file containing a list of features")
port = flag.Int("p", 50052, "port of the service")
)
func main() {
flag.Parse()
lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", *port))
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
grpcServer := grpc.NewServer()
routeguide.RegisterRouteGuideServer(grpcServer, newServer())
grpcServer.Serve(lis)
}
// exampleData is a copy of testdata/route_guide_db.json. It's to avoid
// specifying file path with `go run`.
var exampleData = []byte(`[{
"location": {
"latitude": 407838351,
"longitude": -746143763
},
"name": "Patriots Path, Mendham, NJ 07945, USA"
}, {
"location": {
"latitude": 408122808,
"longitude": -743999179
},
"name": "101 New Jersey 10, Whippany, NJ 07981, USA"
}, {
"location": {
"latitude": 413628156,
"longitude": -749015468
},
"name": "U.S. 6, Shohola, PA 18458, USA"
}, {
"location": {
"latitude": 419999544,
"longitude": -740371136
},
"name": "5 Conners Road, Kingston, NY 12401, USA"
}, {
"location": {
"latitude": 414008389,
"longitude": -743951297
},
"name": "Mid Hudson Psychiatric Center, New Hampton, NY 10958, USA"
}, {
"location": {
"latitude": 419611318,
"longitude": -746524769
},
"name": "287 Flugertown Road, Livingston Manor, NY 12758, USA"
}, {
"location": {
"latitude": 406109563,
"longitude": -742186778
},
"name": "4001 Tremley Point Road, Linden, NJ 07036, USA"
}, {
"location": {
"latitude": 416802456,
"longitude": -742370183
},
"name": "352 South Mountain Road, Wallkill, NY 12589, USA"
}, {
"location": {
"latitude": 412950425,
"longitude": -741077389
},
"name": "Bailey Turn Road, Harriman, NY 10926, USA"
}, {
"location": {
"latitude": 412144655,
"longitude": -743949739
},
"name": "193-199 Wawayanda Road, Hewitt, NJ 07421, USA"
}, {
"location": {
"latitude": 415736605,
"longitude": -742847522
},
"name": "406-496 Ward Avenue, Pine Bush, NY 12566, USA"
}, {
"location": {
"latitude": 413843930,
"longitude": -740501726
},
"name": "162 Merrill Road, Highland Mills, NY 10930, USA"
}, {
"location": {
"latitude": 410873075,
"longitude": -744459023
},
"name": "Clinton Road, West Milford, NJ 07480, USA"
}, {
"location": {
"latitude": 412346009,
"longitude": -744026814
},
"name": "16 Old Brook Lane, Warwick, NY 10990, USA"
}, {
"location": {
"latitude": 402948455,
"longitude": -747903913
},
"name": "3 Drake Lane, Pennington, NJ 08534, USA"
}, {
"location": {
"latitude": 406337092,
"longitude": -740122226
},
"name": "6324 8th Avenue, Brooklyn, NY 11220, USA"
}, {
"location": {
"latitude": 406421967,
"longitude": -747727624
},
"name": "1 Merck Access Road, Whitehouse Station, NJ 08889, USA"
}, {
"location": {
"latitude": 416318082,
"longitude": -749677716
},
"name": "78-98 Schalck Road, Narrowsburg, NY 12764, USA"
}, {
"location": {
"latitude": 415301720,
"longitude": -748416257
},
"name": "282 Lakeview Drive Road, Highland Lake, NY 12743, USA"
}, {
"location": {
"latitude": 402647019,
"longitude": -747071791
},
"name": "330 Evelyn Avenue, Hamilton Township, NJ 08619, USA"
}, {
"location": {
"latitude": 412567807,
"longitude": -741058078
},
"name": "New York State Reference Route 987E, Southfields, NY 10975, USA"
}, {
"location": {
"latitude": 416855156,
"longitude": -744420597
},
"name": "103-271 Tempaloni Road, Ellenville, NY 12428, USA"
}, {
"location": {
"latitude": 404663628,
"longitude": -744820157
},
"name": "1300 Airport Road, North Brunswick Township, NJ 08902, USA"
}, {
"location": {
"latitude": 407113723,
"longitude": -749746483
},
"name": ""
}, {
"location": {
"latitude": 402133926,
"longitude": -743613249
},
"name": ""
}, {
"location": {
"latitude": 400273442,
"longitude": -741220915
},
"name": ""
}, {
"location": {
"latitude": 411236786,
"longitude": -744070769
},
"name": ""
}, {
"location": {
"latitude": 411633782,
"longitude": -746784970
},
"name": "211-225 Plains Road, Augusta, NJ 07822, USA"
}, {
"location": {
"latitude": 415830701,
"longitude": -742952812
},
"name": ""
}, {
"location": {
"latitude": 413447164,
"longitude": -748712898
},
"name": "165 Pedersen Ridge Road, Milford, PA 18337, USA"
}, {
"location": {
"latitude": 405047245,
"longitude": -749800722
},
"name": "100-122 Locktown Road, Frenchtown, NJ 08825, USA"
}, {
"location": {
"latitude": 418858923,
"longitude": -746156790
},
"name": ""
}, {
"location": {
"latitude": 417951888,
"longitude": -748484944
},
"name": "650-652 Willi Hill Road, Swan Lake, NY 12783, USA"
}, {
"location": {
"latitude": 407033786,
"longitude": -743977337
},
"name": "26 East 3rd Street, New Providence, NJ 07974, USA"
}, {
"location": {
"latitude": 417548014,
"longitude": -740075041
},
"name": ""
}, {
"location": {
"latitude": 410395868,
"longitude": -744972325
},
"name": ""
}, {
"location": {
"latitude": 404615353,
"longitude": -745129803
},
"name": ""
}, {
"location": {
"latitude": 406589790,
"longitude": -743560121
},
"name": "611 Lawrence Avenue, Westfield, NJ 07090, USA"
}, {
"location": {
"latitude": 414653148,
"longitude": -740477477
},
"name": "18 Lannis Avenue, New Windsor, NY 12553, USA"
}, {
"location": {
"latitude": 405957808,
"longitude": -743255336
},
"name": "82-104 Amherst Avenue, Colonia, NJ 07067, USA"
}, {
"location": {
"latitude": 411733589,
"longitude": -741648093
},
"name": "170 Seven Lakes Drive, Sloatsburg, NY 10974, USA"
}, {
"location": {
"latitude": 412676291,
"longitude": -742606606
},
"name": "1270 Lakes Road, Monroe, NY 10950, USA"
}, {
"location": {
"latitude": 409224445,
"longitude": -748286738
},
"name": "509-535 Alphano Road, Great Meadows, NJ 07838, USA"
}, {
"location": {
"latitude": 406523420,
"longitude": -742135517
},
"name": "652 Garden Street, Elizabeth, NJ 07202, USA"
}, {
"location": {
"latitude": 401827388,
"longitude": -740294537
},
"name": "349 Sea Spray Court, Neptune City, NJ 07753, USA"
}, {
"location": {
"latitude": 410564152,
"longitude": -743685054
},
"name": "13-17 Stanley Street, West Milford, NJ 07480, USA"
}, {
"location": {
"latitude": 408472324,
"longitude": -740726046
},
"name": "47 Industrial Avenue, Teterboro, NJ 07608, USA"
}, {
"location": {
"latitude": 412452168,
"longitude": -740214052
},
"name": "5 White Oak Lane, Stony Point, NY 10980, USA"
}, {
"location": {
"latitude": 409146138,
"longitude": -746188906
},
"name": "Berkshire Valley Management Area Trail, Jefferson, NJ, USA"
}, {
"location": {
"latitude": 404701380,
"longitude": -744781745
},
"name": "1007 Jersey Avenue, New Brunswick, NJ 08901, USA"
}, {
"location": {
"latitude": 409642566,
"longitude": -746017679
},
"name": "6 East Emerald Isle Drive, Lake Hopatcong, NJ 07849, USA"
}, {
"location": {
"latitude": 408031728,
"longitude": -748645385
},
"name": "1358-1474 New Jersey 57, Port Murray, NJ 07865, USA"
}, {
"location": {
"latitude": 413700272,
"longitude": -742135189
},
"name": "367 Prospect Road, Chester, NY 10918, USA"
}, {
"location": {
"latitude": 404310607,
"longitude": -740282632
},
"name": "10 Simon Lake Drive, Atlantic Highlands, NJ 07716, USA"
}, {
"location": {
"latitude": 409319800,
"longitude": -746201391
},
"name": "11 Ward Street, Mount Arlington, NJ 07856, USA"
}, {
"location": {
"latitude": 406685311,
"longitude": -742108603
},
"name": "300-398 Jefferson Avenue, Elizabeth, NJ 07201, USA"
}, {
"location": {
"latitude": 419018117,
"longitude": -749142781
},
"name": "43 Dreher Road, Roscoe, NY 12776, USA"
}, {
"location": {
"latitude": 412856162,
"longitude": -745148837
},
"name": "Swan Street, Pine Island, NY 10969, USA"
}, {
"location": {
"latitude": 416560744,
"longitude": -746721964
},
"name": "66 Pleasantview Avenue, Monticello, NY 12701, USA"
}, {
"location": {
"latitude": 405314270,
"longitude": -749836354
},
"name": ""
}, {
"location": {
"latitude": 414219548,
"longitude": -743327440
},
"name": ""
}, {
"location": {
"latitude": 415534177,
"longitude": -742900616
},
"name": "565 Winding Hills Road, Montgomery, NY 12549, USA"
}, {
"location": {
"latitude": 406898530,
"longitude": -749127080
},
"name": "231 Rocky Run Road, Glen Gardner, NJ 08826, USA"
}, {
"location": {
"latitude": 407586880,
"longitude": -741670168
},
"name": "100 Mount Pleasant Avenue, Newark, NJ 07104, USA"
}, {
"location": {
"latitude": 400106455,
"longitude": -742870190
},
"name": "517-521 Huntington Drive, Manchester Township, NJ 08759, USA"
}, {
"location": {
"latitude": 400066188,
"longitude": -746793294
},
"name": ""
}, {
"location": {
"latitude": 418803880,
"longitude": -744102673
},
"name": "40 Mountain Road, Napanoch, NY 12458, USA"
}, {
"location": {
"latitude": 414204288,
"longitude": -747895140
},
"name": ""
}, {
"location": {
"latitude": 414777405,
"longitude": -740615601
},
"name": ""
}, {
"location": {
"latitude": 415464475,
"longitude": -747175374
},
"name": "48 North Road, Forestburgh, NY 12777, USA"
}, {
"location": {
"latitude": 404062378,
"longitude": -746376177
},
"name": ""
}, {
"location": {
"latitude": 405688272,
"longitude": -749285130
},
"name": ""
}, {
"location": {
"latitude": 400342070,
"longitude": -748788996
},
"name": ""
}, {
"location": {
"latitude": 401809022,
"longitude": -744157964
},
"name": ""
}, {
"location": {
"latitude": 404226644,
"longitude": -740517141
},
"name": "9 Thompson Avenue, Leonardo, NJ 07737, USA"
}, {
"location": {
"latitude": 410322033,
"longitude": -747871659
},
"name": ""
}, {
"location": {
"latitude": 407100674,
"longitude": -747742727
},
"name": ""
}, {
"location": {
"latitude": 418811433,
"longitude": -741718005
},
"name": "213 Bush Road, Stone Ridge, NY 12484, USA"
}, {
"location": {
"latitude": 415034302,
"longitude": -743850945
},
"name": ""
}, {
"location": {
"latitude": 411349992,
"longitude": -743694161
},
"name": ""
}, {
"location": {
"latitude": 404839914,
"longitude": -744759616
},
"name": "1-17 Bergen Court, New Brunswick, NJ 08901, USA"
}, {
"location": {
"latitude": 414638017,
"longitude": -745957854
},
"name": "35 Oakland Valley Road, Cuddebackville, NY 12729, USA"
}, {
"location": {
"latitude": 412127800,
"longitude": -740173578
},
"name": ""
}, {
"location": {
"latitude": 401263460,
"longitude": -747964303
},
"name": ""
}, {
"location": {
"latitude": 412843391,
"longitude": -749086026
},
"name": ""
}, {
"location": {
"latitude": 418512773,
"longitude": -743067823
},
"name": ""
}, {
"location": {
"latitude": 404318328,
"longitude": -740835638
},
"name": "42-102 Main Street, Belford, NJ 07718, USA"
}, {
"location": {
"latitude": 419020746,
"longitude": -741172328
},
"name": ""
}, {
"location": {
"latitude": 404080723,
"longitude": -746119569
},
"name": ""
}, {
"location": {
"latitude": 401012643,
"longitude": -744035134
},
"name": ""
}, {
"location": {
"latitude": 404306372,
"longitude": -741079661
},
"name": ""
}, {
"location": {
"latitude": 403966326,
"longitude": -748519297
},
"name": ""
}, {
"location": {
"latitude": 405002031,
"longitude": -748407866
},
"name": ""
}, {
"location": {
"latitude": 409532885,
"longitude": -742200683
},
"name": ""
}, {
"location": {
"latitude": 416851321,
"longitude": -742674555
},
"name": ""
}, {
"location": {
"latitude": 406411633,
"longitude": -741722051
},
"name": "3387 Richmond Terrace, Staten Island, NY 10303, USA"
}, {
"location": {
"latitude": 413069058,
"longitude": -744597778
},
"name": "261 Van Sickle Road, Goshen, NY 10924, USA"
}, {
"location": {
"latitude": 418465462,
"longitude": -746859398
},
"name": ""
}, {
"location": {
"latitude": 411733222,
"longitude": -744228360
},
"name": ""
}, {
"location": {
"latitude": 410248224,
"longitude": -747127767
},
"name": "3 Hasta Way, Newton, NJ 07860, USA"
}]`)
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