diff --git a/.gitignore b/.gitignore index 3c3629e..944c283 100644 --- a/.gitignore +++ b/.gitignore @@ -1 +1,2 @@ node_modules +.idea/ diff --git a/Dockerfile b/Dockerfile index 41fafd5..1a3a484 100644 --- a/Dockerfile +++ b/Dockerfile @@ -1,9 +1,11 @@ -FROM node:12.15.0 -WORKDIR /usr/src/app -COPY package*.json ./ -RUN npm --version && node --version -RUN npm install -COPY . . -EXPOSE 9090 -CMD ["node", "-r", "esm", "index.js" ] +FROM paulcager/go-base:latest + +EXPOSE 9090 +WORKDIR /go/src/osgrid-server + +COPY go.mod *.go ./ +RUN go install -v ./... && sha256sum /go/bin/osgrid-server + +CMD [ "/go/bin/osgrid-server" ] + diff --git a/README.md b/README.md index 5fc75fe..49f72d3 100644 --- a/README.md +++ b/README.md @@ -1,7 +1,7 @@ # osgrid-server - _Ordnance Survey Grid Ref Converter_ -This project implements a simple REST server to expose the excellent https://www.movable-type.co.uk/scripts/latlong-os-gridref.html -Ordnance Survey grid reference conversion utilities. +This project implements a simple REST server to allow conversion between Ordnance Survey +grid references and latitude / longitude. ## Usage @@ -9,13 +9,13 @@ The easiest way to avoid environmental or Node versioning problems is to start t docker run -d --rm --name osgrid-server -p 9090:9090 paulcager/osgrid-server -A grid reference may then be converted to a lat /lon: +A grid reference may then be converted to a lat / lon: - $ curl http://localhost:9090/gridref/SU3724515505 - 50.93779289256305,-1.471309033422234 + $ curl http://localhost:9090/v4/gridref/SU37241550 + {"osGridRef":"SU37241550","easting":437240,"northing":115500,"lat":50.93774069083967,"lon":-1.4713807843405298} Or a lat/lon converted to a grid reference: - $ curl http://localhost:9090/latlon/50.9378,-1.4713 - SU 37245 15505 + $ curl http://localhost:9090/v4/latlon/50.9378,-1.4713 + {"osGridRef":"SU37241550","easting":437246,"northing":115507,"lat":50.9378,"lon":-1.4713} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..2b99d28 --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +module osgrid-server + +go 1.15 + +require ( + github.com/paulcager/osgridref v1.0.1 + github.com/spf13/pflag v1.0.5 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..dfd4ebe --- /dev/null +++ b/go.sum @@ -0,0 +1,12 @@ +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/paulcager/osgridref v1.0.1 h1:/EX0qWi5LU9zjqE6bxIDgXSEJOAJRCqRIXAnZOB3JnI= +github.com/paulcager/osgridref v1.0.1/go.mod h1:ufyaMOUx5kOvX4naQZy2JxXME4RnN0y7lec+eIaAt2E= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/robertkrimen/otto v0.0.0-20200922221731-ef014fd054ac/go.mod h1:xvqspoSXJTIpemEonrMDFq6XzwHYYgToXWj5eRX1OtY= +github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA= +github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg= +github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= +github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/sourcemap.v1 v1.0.5/go.mod h1:2RlvNNSMglmRrcvhfuzp4hQHwOtjxlbjX7UPY/GXb78= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/index.js b/index.js deleted file mode 100644 index 646d637..0000000 --- a/index.js +++ /dev/null @@ -1,27 +0,0 @@ -// Convert between Ordnance Survey grid reference and WGS-84 lat/lon. -// See https://www.movable-type.co.uk/scripts/latlong-os-gridref.html - -import OsGridRef from 'geodesy/osgridref.js'; -import { LatLon } from 'geodesy/osgridref.js'; -const url = require('url'); -const express = require('express'); - -const app = express(); - -// Usage: http://server/gridref=osgb-grid-ref -app.get('/gridref/:ref', (request, response) => { - const gridref = OsGridRef.parse(request.params.ref); - const wgs84 = gridref.toLatLon(); - response.send(String(wgs84.lat) + "," + String(wgs84.lon)); -}); - -// Usage: http://server/latlon=lat,lon -app.get('/latlon/:latlon', (request, response) => { - const parts = request.params.latlon.split(","); - const wgs84 = new LatLon(parts[0], parts[1]); - const gridref = wgs84.toOsGrid(); - response.send(gridref.toString()); -}); - -app.listen(9090, () => console.log('Listening on port 9090')); - diff --git a/osgrid-server.go b/osgrid-server.go new file mode 100644 index 0000000..7bf5921 --- /dev/null +++ b/osgrid-server.go @@ -0,0 +1,134 @@ +package main + +import ( + "encoding/json" + "fmt" + "log" + "math" + "net/http" + "strings" + "time" + + "github.com/paulcager/osgridref" + flag "github.com/spf13/pflag" +) + +const ( + apiVersion = "v4" +) + +var ( + staticCache time.Duration + listenPort string +) + +func main() { + flag.StringVar(&listenPort, "port", ":9090", "Port to listen on") + flag.DurationVar(&staticCache, "static-cache-max-age", 1*time.Hour, "If not zero, the max-age property to set in Cache-Control for responses") + flag.Parse() + + server := makeHTTPServer(listenPort) + log.Fatal(server.ListenAndServe()) +} + +type Reply struct { + OSGridRef string `json:"osGridRef"` + Easting int `json:"easting"` + Northing int `json:"northing"` + Lat float64 `json:"lat"` + Lon float64 `json:"lon"` +} + +func makeHTTPServer(listenPort string) *http.Server { + http.Handle("/"+apiVersion+"/gridref/", makeCachingHandler(1*time.Hour, http.HandlerFunc( + func(w http.ResponseWriter, r *http.Request) { + gridRefStr := r.URL.Path[len("/"+apiVersion+"/gridref/"):] + gridRef, err := osgridref.ParseOsGridRef(gridRefStr) + if err != nil { + handleError(w, r, gridRefStr, err) + return + } + + lat, lon := gridRef.ToLatLon() + handle(w, r, gridRef, lat, lon) + }))) + + http.Handle("/"+apiVersion+"/latlon/", makeCachingHandler(1*time.Hour, http.HandlerFunc( + func(w http.ResponseWriter, r *http.Request) { + latLonStr := r.URL.Path[len("/"+apiVersion+"/latlon/"):] + latLon, err := osgridref.ParseLatLon(latLonStr, 0, osgridref.WGS84) + if err != nil { + handleError(w, r, latLonStr, err) + return + } + + gridRef := latLon.ToOsGridRef() + handle(w, r, gridRef, latLon.Lat, latLon.Lon) + }))) + + if !strings.Contains(listenPort, ":") { + listenPort = ":" + listenPort + } + + log.Println("Starting HTTP server on " + listenPort) + s := &http.Server{ + ReadHeaderTimeout: 20 * time.Second, + WriteTimeout: 2 * time.Minute, + IdleTimeout: 10 * time.Minute, + Handler: makeLoggingHandler(http.DefaultServeMux), + Addr: listenPort, + } + + return s +} + +func handleError(w http.ResponseWriter, _ *http.Request, str string, _ error) { + w.WriteHeader(http.StatusBadRequest) + fmt.Fprintf(w, "Invalid request: %q\n", str) +} + +func handle(w http.ResponseWriter, _ *http.Request, ref osgridref.OsGridRef, lat float64, lon float64) { + reply := Reply{ + OSGridRef: ref.StringNCompact(8), + Easting: ref.Easting, + Northing: ref.Northing, + Lat: lat, + Lon: lon, + } + + w.Header().Add("Content-Type", "application/json") + enc := json.NewEncoder(w) + enc.SetEscapeHTML(false) + err := enc.Encode(reply) + if err != nil { + log.Printf("Failed to write response: %s", err) + w.WriteHeader(http.StatusBadGateway) + } +} + +func makeCachingHandler(age time.Duration, h http.Handler) http.Handler { + ageSeconds := int64(math.Round(age.Seconds())) + if ageSeconds <= 0 { + return h + } + + header := fmt.Sprintf("public,max-age=%d", ageSeconds) + return http.HandlerFunc( + func(w http.ResponseWriter, r *http.Request) { + w.Header().Add("Cache-Control", header) + h.ServeHTTP(w, r) + }) +} + +func makeLoggingHandler(h http.Handler) http.Handler { + return http.HandlerFunc( + func(w http.ResponseWriter, r *http.Request) { + start := time.Now() + h.ServeHTTP(w, r) + end := time.Now() + + uri := r.URL.String() + method := r.Method + fmt.Printf("%s %s %s %d\n", method, uri, r.RemoteAddr, end.Sub(start).Milliseconds()) + }) +} diff --git a/package-lock.json b/package-lock.json deleted file mode 100644 index 3467df5..0000000 --- a/package-lock.json +++ /dev/null @@ -1,436 +0,0 @@ -{ - 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