Upgrade server dependencies, manage them with govendor

vendor/github.com/blevesearch/bleve/geo/geo.go

@@ -0,0 +1,205 @@
+//  Copyright (c) 2017 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package geo
+
+import (
+	"math"
+
+	"github.com/blevesearch/bleve/numeric"
+)
+
+// GeoBits is the number of bits used for a single geo point
+// Currently this is 32bits for lon and 32bits for lat
+var GeoBits uint = 32
+
+var minLon = -180.0
+var minLat = -90.0
+var geoTolerance = 1E-6
+var lonScale = float64((uint64(0x1)<<GeoBits)-1) / 360.0
+var latScale = float64((uint64(0x1)<<GeoBits)-1) / 180.0
+
+// MortonHash computes the morton hash value for the provided geo point
+// This point is ordered as lon, lat.
+func MortonHash(lon, lat float64) uint64 {
+	return numeric.Interleave(scaleLon(lon), scaleLat(lat))
+}
+
+func scaleLon(lon float64) uint64 {
+	rv := uint64((lon - minLon) * lonScale)
+	return rv
+}
+
+func scaleLat(lat float64) uint64 {
+	rv := uint64((lat - minLat) * latScale)
+	return rv
+}
+
+// MortonUnhashLon extracts the longitude value from the provided morton hash.
+func MortonUnhashLon(hash uint64) float64 {
+	return unscaleLon(numeric.Deinterleave(hash))
+}
+
+// MortonUnhashLat extracts the latitude value from the provided morton hash.
+func MortonUnhashLat(hash uint64) float64 {
+	return unscaleLat(numeric.Deinterleave(hash >> 1))
+}
+
+func unscaleLon(lon uint64) float64 {
+	return (float64(lon) / lonScale) + minLon
+}
+
+func unscaleLat(lat uint64) float64 {
+	return (float64(lat) / latScale) + minLat
+}
+
+// compareGeo will compare two float values and see if they are the same
+// taking into consideration a known geo tolerance.
+func compareGeo(a, b float64) float64 {
+	compare := a - b
+	if math.Abs(compare) <= geoTolerance {
+		return 0
+	}
+	return compare
+}
+
+// RectIntersects checks whether rectangles a and b intersect
+func RectIntersects(aMinX, aMinY, aMaxX, aMaxY, bMinX, bMinY, bMaxX, bMaxY float64) bool {
+	return !(aMaxX < bMinX || aMinX > bMaxX || aMaxY < bMinY || aMinY > bMaxY)
+}
+
+// RectWithin checks whether box a is within box b
+func RectWithin(aMinX, aMinY, aMaxX, aMaxY, bMinX, bMinY, bMaxX, bMaxY float64) bool {
+	rv := !(aMinX < bMinX || aMinY < bMinY || aMaxX > bMaxX || aMaxY > bMaxY)
+	return rv
+}
+
+// BoundingBoxContains checks whether the lon/lat point is within the box
+func BoundingBoxContains(lon, lat, minLon, minLat, maxLon, maxLat float64) bool {
+	return compareGeo(lon, minLon) >= 0 && compareGeo(lon, maxLon) <= 0 &&
+		compareGeo(lat, minLat) >= 0 && compareGeo(lat, maxLat) <= 0
+}
+
+// ComputeBoundingBox will compute a bounding box around the provided point
+// which surrounds a circle of the provided radius (in meters).
+func ComputeBoundingBox(centerLon, centerLat,
+	radius float64) (upperLeftLon float64, upperLeftLat float64,
+	lowerRightLon float64, lowerRightLat float64) {
+	_, tlat := pointFromLonLatBearing(centerLon, centerLat, 0, radius)
+	rlon, _ := pointFromLonLatBearing(centerLon, centerLat, 90, radius)
+	_, blat := pointFromLonLatBearing(centerLon, centerLat, 180, radius)
+	llon, _ := pointFromLonLatBearing(centerLon, centerLat, 270, radius)
+	return normalizeLon(llon), normalizeLat(tlat),
+		normalizeLon(rlon), normalizeLat(blat)
+}
+
+const degreesToRadian = math.Pi / 180
+const radiansToDegrees = 180 / math.Pi
+const flattening = 1.0 / 298.257223563
+const semiMajorAxis = 6378137
+const semiMinorAxis = semiMajorAxis * (1.0 - flattening)
+const semiMajorAxis2 = semiMajorAxis * semiMajorAxis
+const semiMinorAxis2 = semiMinorAxis * semiMinorAxis
+
+// DegreesToRadians converts an angle in degrees to radians
+func DegreesToRadians(d float64) float64 {
+	return d * degreesToRadian
+}
+
+// RadiansToDegrees converts an angle in radians to degress
+func RadiansToDegrees(r float64) float64 {
+	return r * radiansToDegrees
+}
+
+// pointFromLonLatBearing starts that the provide lon,lat
+// then moves in the bearing direction (in degrees)
+// this move continues for the provided distance (in meters)
+// The lon, lat of this destination location is returned.
+func pointFromLonLatBearing(lon, lat, bearing,
+	dist float64) (float64, float64) {
+
+	alpha1 := DegreesToRadians(bearing)
+	cosA1 := math.Cos(alpha1)
+	sinA1 := math.Sin(alpha1)
+	tanU1 := (1 - flattening) * math.Tan(DegreesToRadians(lat))
+	cosU1 := 1 / math.Sqrt(1+tanU1*tanU1)
+	sinU1 := tanU1 * cosU1
+	sig1 := math.Atan2(tanU1, cosA1)
+	sinAlpha := cosU1 * sinA1
+	cosSqAlpha := 1 - sinAlpha*sinAlpha
+	uSq := cosSqAlpha * (semiMajorAxis2 - semiMinorAxis2) / semiMinorAxis2
+	A := 1 + uSq/16384*(4096+uSq*(-768+uSq*(320-175*uSq)))
+	B := uSq / 1024 * (256 + uSq*(-128+uSq*(74-47*uSq)))
+
+	sigma := dist / (semiMinorAxis * A)
+
+	cos25SigmaM := math.Cos(2*sig1 + sigma)
+	sinSigma := math.Sin(sigma)
+	cosSigma := math.Cos(sigma)
+	deltaSigma := B * sinSigma * (cos25SigmaM + (B/4)*
+		(cosSigma*(-1+2*cos25SigmaM*cos25SigmaM)-(B/6)*cos25SigmaM*
+			(-1+4*sinSigma*sinSigma)*(-3+4*cos25SigmaM*cos25SigmaM)))
+	sigmaP := sigma
+	sigma = dist/(semiMinorAxis*A) + deltaSigma
+	for math.Abs(sigma-sigmaP) > 1E-12 {
+		cos25SigmaM = math.Cos(2*sig1 + sigma)
+		sinSigma = math.Sin(sigma)
+		cosSigma = math.Cos(sigma)
+		deltaSigma = B * sinSigma * (cos25SigmaM + (B/4)*
+			(cosSigma*(-1+2*cos25SigmaM*cos25SigmaM)-(B/6)*cos25SigmaM*
+				(-1+4*sinSigma*sinSigma)*(-3+4*cos25SigmaM*cos25SigmaM)))
+		sigmaP = sigma
+		sigma = dist/(semiMinorAxis*A) + deltaSigma
+	}
+
+	tmp := sinU1*sinSigma - cosU1*cosSigma*cosA1
+	lat2 := math.Atan2(sinU1*cosSigma+cosU1*sinSigma*cosA1,
+		(1-flattening)*math.Sqrt(sinAlpha*sinAlpha+tmp*tmp))
+	lamda := math.Atan2(sinSigma*sinA1, cosU1*cosSigma-sinU1*sinSigma*cosA1)
+	c := flattening / 16 * cosSqAlpha * (4 + flattening*(4-3*cosSqAlpha))
+	lam := lamda - (1-c)*flattening*sinAlpha*
+		(sigma+c*sinSigma*(cos25SigmaM+c*cosSigma*(-1+2*cos25SigmaM*cos25SigmaM)))
+
+	rvlon := lon + RadiansToDegrees(lam)
+	rvlat := RadiansToDegrees(lat2)
+
+	return rvlon, rvlat
+}
+
+// normalizeLon normalizes a longitude value within the -180 to 180 range
+func normalizeLon(lonDeg float64) float64 {
+	if lonDeg >= -180 && lonDeg <= 180 {
+		return lonDeg
+	}
+
+	off := math.Mod(lonDeg+180, 360)
+	if off < 0 {
+		return 180 + off
+	} else if off == 0 && lonDeg > 0 {
+		return 180
+	}
+	return -180 + off
+}
+
+// normalizeLat normalizes a latitude value within the -90 to 90 range
+func normalizeLat(latDeg float64) float64 {
+	if latDeg >= -90 && latDeg <= 90 {
+		return latDeg
+	}
+	off := math.Abs(math.Mod(latDeg+90, 360))
+	if off <= 180 {
+		return off - 90
+	}
+	return (360 - off) - 90
+}