Locations Service (#34)

* Locations Proto * Add Read RPC * Locations Service * Add read locks
2026-01-11 19:04:35 +00:00 · 2021-01-08 09:20:22 +00:00
parent 9971d97582
commit de2c437c41
14 changed files with 1770 additions and 0 deletions
--- a/go.mod
+++ b/go.mod
@@ -11,6 +11,7 @@ require (
 	github.com/micro/dev v0.0.0-20201117163752-d3cfc9788dfa
 	github.com/micro/micro/v3 v3.0.5-0.20201219085254-c8ea24387d19
 	github.com/miekg/dns v1.1.31 // indirect
+	github.com/stretchr/testify v1.6.1
 	github.com/ulikunitz/xz v0.5.8 // indirect
 	golang.org/x/crypto v0.0.0-20201002094018-c90954cbb977
 	golang.org/x/net v0.0.0-20200930145003-4acb6c075d10
@@ -18,7 +19,10 @@ require (
 	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
 	google.golang.org/genproto v0.0.0-20201001141541-efaab9d3c4f7 // indirect
 	google.golang.org/grpc v1.32.0 // indirect
+	google.golang.org/protobuf v1.25.0
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
+	gorm.io/driver/postgres v1.0.6
+	gorm.io/gorm v1.20.9
 )

 replace google.golang.org/grpc => google.golang.org/grpc v1.26.0
--- a/go.sum
+++ b/go.sum
@@ -80,10 +80,14 @@ github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5P
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@@ -216,7 +220,54 @@ github.com/improbable-eng/grpc-web v0.13.0 h1:7XqtaBWaOCH0cVGKHyvhtcuo6fgW32Y10y
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 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
@@ -376,6 +446,7 @@ github.com/xlab/treeprint v0.0.0-20181112141820-a009c3971eca/go.mod h1:ce1O1j6Ut
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/zenazn/goji v0.9.0/go.mod h1:7S9M489iMyHBNxwZnk9/EHS098H4/F6TATF2mIxtB1Q=
 go.etcd.io/bbolt v1.3.5 h1:XAzx9gjCb0Rxj7EoqcClPD1d5ZBxZJk0jbuoPHenBt0=
 go.etcd.io/bbolt v1.3.5/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
@@ -386,16 +457,27 @@ go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.uber.org/atomic v1.6.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
+go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
+go.uber.org/multierr v1.5.0/go.mod h1:FeouvMocqHpRaaGuG9EjoKcStLC43Zu/fmqdUMPcKYU=
 go.uber.org/ratelimit v0.0.0-20180316092928-c15da0234277/go.mod h1:2X8KaoNd1J0lZV+PxJk/5+DGbO/tpwLR1m++a7FnB/Y=
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 golang.org/x/crypto v0.0.0-20180621125126-a49355c7e3f8/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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 golang.org/x/crypto v0.0.0-20201002094018-c90954cbb977 h1:yH6opeNE+0SY+7pXT4gclZUoKHogXeC2EvOSHGOMGPU=
@@ -448,6 +530,7 @@ golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190930134127-c5a3c61f89f3/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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@@ -493,6 +576,7 @@ golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190209173611-3b5209105503/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -503,6 +587,8 @@ golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -510,6 +596,7 @@ golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -542,14 +629,18 @@ golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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@@ -576,6 +667,8 @@ golang.org/x/tools v0.0.0-20200618134242-20370b0cb4b2/go.mod h1:EkVYQZoAsY45+roY
 golang.org/x/tools v0.0.0-20200729194436-6467de6f59a7/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
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@@ -659,6 +752,7 @@ gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
+gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
 gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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@@ -679,6 +773,11 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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+gorm.io/driver/postgres v1.0.6 h1:9sqNcNC9PCkZ6tMzWF1cEE2PARlCONgSqRobszSTffw=
+gorm.io/driver/postgres v1.0.6/go.mod h1:r0nvX27yHDNbVeXMM9Y+9i5xSePcT18RfH8clP6wpwI=
+gorm.io/gorm v1.20.8/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.9 h1:M3aIZKXAC1PtPVu9t3WGwkBTE1le5c2telz3I/qjRNg=
+gorm.io/gorm v1.20.9/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/locations/.gitignore
+++ b/locations/.gitignore
@@ -0,0 +1 @@
+locations
--- a/locations/Makefile
+++ b/locations/Makefile
@@ -0,0 +1,18 @@
+GOPATH:=$(shell go env GOPATH)
+.PHONY: init
+init:
+	go get -u github.com/golang/protobuf/proto
+	go get -u github.com/golang/protobuf/protoc-gen-go
+	go get github.com/micro/micro/v3/cmd/protoc-gen-micro
+
+.PHONY: proto
+proto:
+	protoc --proto_path=. --micro_out=. --go_out=:. proto/locations.proto
+	
+.PHONY: build
+build:
+	go build -o locations *.go
+
+.PHONY: test
+test:
+	go test -v ./... -cover
--- a/locations/README.md
+++ b/locations/README.md
@@ -0,0 +1,23 @@
+# Locations Service
+
+This is the Locations service
+
+Generated with
+
+```
+micro new locations
+```
+
+## Usage
+
+Generate the proto code
+
+```
+make proto
+```
+
+Run the service
+
+```
+micro run .
+```
--- a/locations/generate.go
+++ b/locations/generate.go
@@ -0,0 +1,2 @@
+package main
+//go:generate make proto
--- a/locations/handler/locations.go
+++ b/locations/handler/locations.go
@@ -0,0 +1,177 @@
+package handler
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"github.com/google/uuid"
+	geo "github.com/hailocab/go-geoindex"
+	"google.golang.org/protobuf/types/known/timestamppb"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+	"gorm.io/gorm"
+
+	"github.com/micro/micro/v3/service/errors"
+	"github.com/micro/micro/v3/service/logger"
+	"github.com/micro/services/locations/model"
+	pb "github.com/micro/services/locations/proto"
+)
+
+var (
+	ErrMissingLocations = errors.BadRequest("MISSING_LOCATIONS", "One or more locations are required")
+	ErrMissingLatitude  = errors.BadRequest("MISSING_LATITUDE", "Latitude is required")
+	ErrMissingLongitude = errors.BadRequest("MISSING_LONGITUDE", "Longitude is required")
+	ErrMissingUserID    = errors.BadRequest("MISSING_USER_ID", "UserID is required")
+	ErrMissingUserIDs   = errors.BadRequest("MISSING_USER_IDS", "One or more UserIDs are required")
+	ErrMissingBefore    = errors.BadRequest("MISSING_BEFORE", "Before timestamp is required")
+	ErrMissingAfter     = errors.BadRequest("MISSING_AFTER", "After timestamp is required")
+	ErrMissingRadius    = errors.BadRequest("MISSING_RADIUS", "Radius is required")
+)
+
+type Locations struct {
+	sync.RWMutex
+
+	Geoindex *geo.PointsIndex
+	DB       *gorm.DB
+}
+
+// Save a set of locations
+func (l *Locations) Save(ctx context.Context, req *pb.SaveRequest, rsp *pb.SaveResponse) error {
+	// validate the request
+	if len(req.Locations) == 0 {
+		return ErrMissingLocations
+	}
+	for _, l := range req.Locations {
+		if l.Latitude == nil {
+			return ErrMissingLatitude
+		}
+		if l.Longitude == nil {
+			return ErrMissingLongitude
+		}
+		if len(l.UserId) == 0 {
+			return ErrMissingUserID
+		}
+	}
+
+	// construct the database objects
+	ls := make([]*model.Location, len(req.Locations))
+	for i, lc := range req.Locations {
+		loc := &model.Location{
+			ID:        uuid.New().String(),
+			UserID:    lc.UserId,
+			Latitude:  lc.Latitude.Value,
+			Longitude: lc.Longitude.Value,
+		}
+		if lc.Timestamp != nil {
+			loc.Timestamp = lc.Timestamp.AsTime()
+		} else {
+			loc.Timestamp = time.Now()
+		}
+		ls[i] = loc
+	}
+
+	// write to the database
+	if err := l.DB.Create(ls).Error; err != nil {
+		logger.Errorf("Error writing to the database: %v", err)
+		return errors.InternalServerError("DATABASE_ERROR", "Error writing to the database")
+	}
+
+	// write to the geoindex
+	l.Lock()
+	defer l.Unlock()
+	for _, lc := range ls {
+		l.Geoindex.Add(lc)
+	}
+	return nil
+}
+
+// Last locations for a set of users
+func (l *Locations) Last(ctx context.Context, req *pb.LastRequest, rsp *pb.ListResponse) error {
+	// validate the request
+	if req.UserIds == nil {
+		return ErrMissingUserIDs
+	}
+
+	// query the database
+	q := l.DB.Raw("SELECT DISTINCT ON (user_id) user_id, timestamp, latitude, longitude FROM locations WHERE user_id IN (?) ORDER BY user_id, timestamp DESC", req.UserIds)
+	var locs []*model.Location
+	if err := q.Find(&locs).Error; err != nil {
+		logger.Errorf("Error reading from the database: %v", err)
+		return errors.InternalServerError("DATABASE_ERROR", "Error reading from the database")
+	}
+
+	// serialize the result
+	rsp.Locations = serializeLocations(locs)
+	return nil
+}
+
+// Near returns the locations near a point
+func (l *Locations) Near(ctx context.Context, req *pb.NearRequest, rsp *pb.ListResponse) error {
+	// validate the request
+	if req.Latitude == nil {
+		return ErrMissingLatitude
+	}
+	if req.Longitude == nil {
+		return ErrMissingLongitude
+	}
+	if req.Radius == nil {
+		return ErrMissingRadius
+	}
+
+	// query the geoindex
+	l.RLock()
+	p := geo.NewGeoPoint("query", req.Latitude.Value, req.Longitude.Value)
+	result := l.Geoindex.PointsWithin(p, geo.Km(req.Radius.Value), func(p geo.Point) bool {
+		return true
+	})
+	l.RUnlock()
+
+	// serialize the result
+	locs := make([]*model.Location, len(result))
+	for i, r := range result {
+		locs[i] = r.(*model.Location)
+	}
+	rsp.Locations = serializeLocations(locs)
+	return nil
+}
+
+// Read locations for a group of users between two points in time
+func (l *Locations) Read(ctx context.Context, req *pb.ReadRequest, rsp *pb.ListResponse) error {
+	// validate the request
+	if len(req.UserIds) == 0 {
+		return ErrMissingUserIDs
+	}
+	if req.Before == nil {
+		return ErrMissingBefore
+	}
+	if req.After == nil {
+		return ErrMissingAfter
+	}
+
+	// construct the request
+	q := l.DB.Model(&model.Location{})
+	q = q.Order("timestamp ASC")
+	q = q.Where("user_id IN (?) AND timestamp > ? AND timestamp < ?", req.UserIds, req.After.AsTime(), req.Before.AsTime())
+	var locs []*model.Location
+	if err := q.Find(&locs).Error; err != nil {
+		logger.Errorf("Error reading from the database: %v", err)
+		return errors.InternalServerError("DATABASE_ERROR", "Error reading from the database")
+	}
+
+	// serialize the result
+	rsp.Locations = serializeLocations(locs)
+	return nil
+}
+
+func serializeLocations(locs []*model.Location) []*pb.Location {
+	rsp := make([]*pb.Location, len(locs))
+	for i, l := range locs {
+		rsp[i] = &pb.Location{
+			UserId:    l.UserID,
+			Latitude:  &wrapperspb.DoubleValue{Value: l.Latitude},
+			Longitude: &wrapperspb.DoubleValue{Value: l.Longitude},
+			Timestamp: timestamppb.New(l.Timestamp),
+		}
+	}
+	return rsp
+}
--- a/locations/handler/locations_test.go
+++ b/locations/handler/locations_test.go
@@ -0,0 +1,519 @@
+package handler_test
+
+import (
+	"context"
+	"sort"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	geo "github.com/hailocab/go-geoindex"
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/protobuf/types/known/timestamppb"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+
+	"github.com/micro/services/locations/handler"
+	"github.com/micro/services/locations/model"
+	pb "github.com/micro/services/locations/proto"
+)
+
+func testHandler(t *testing.T) pb.LocationsHandler {
+	// connect to the database
+	db, err := gorm.Open(postgres.Open("postgresql://postgres@localhost:5432/locations?sslmode=disable"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("Error connecting to database: %v", err)
+	}
+
+	// migrate the database
+	if err := db.AutoMigrate(&model.Location{}); err != nil {
+		t.Fatalf("Error migrating database: %v", err)
+	}
+
+	// clean any data from a previous run
+	if err := db.Exec("TRUNCATE TABLE locations CASCADE").Error; err != nil {
+		t.Fatalf("Error cleaning database: %v", err)
+	}
+
+	return &handler.Locations{DB: db, Geoindex: geo.NewPointsIndex(geo.Km(0.1))}
+}
+
+func TestSave(t *testing.T) {
+	tt := []struct {
+		Name      string
+		Locations []*pb.Location
+		Error     error
+	}{
+		{
+			Name:  "NoLocations",
+			Error: handler.ErrMissingLocations,
+		},
+		{
+			Name: "NoLatitude",
+			Locations: []*pb.Location{
+				{
+					Longitude: &wrapperspb.DoubleValue{Value: -0.1246},
+					UserId:    uuid.New().String(),
+				},
+			},
+			Error: handler.ErrMissingLatitude,
+		},
+		{
+			Name: "NoLongitude",
+			Locations: []*pb.Location{
+				{
+					Latitude: &wrapperspb.DoubleValue{Value: -0.1246},
+					UserId:   uuid.New().String(),
+				},
+			},
+			Error: handler.ErrMissingLongitude,
+		},
+		{
+			Name: "OneLocation",
+			Locations: []*pb.Location{
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: 51.5007},
+					Longitude: &wrapperspb.DoubleValue{Value: 0.1246},
+					Timestamp: timestamppb.New(time.Now()),
+					UserId:    uuid.New().String(),
+				},
+			},
+		},
+		{
+			Name: "ManyLocations",
+			Locations: []*pb.Location{
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: 51.5007},
+					Longitude: &wrapperspb.DoubleValue{Value: 0.1246},
+					Timestamp: timestamppb.New(time.Now()),
+					UserId:    uuid.New().String(),
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: 51.003},
+					Longitude: &wrapperspb.DoubleValue{Value: -0.1246},
+					UserId:    uuid.New().String(),
+				},
+			},
+		},
+	}
+
+	h := testHandler(t)
+
+	for _, tc := range tt {
+		t.Run(tc.Name, func(t *testing.T) {
+			err := h.Save(context.Background(), &pb.SaveRequest{
+				Locations: tc.Locations,
+			}, &pb.SaveResponse{})
+			assert.Equal(t, tc.Error, err)
+		})
+	}
+}
+
+func TestLast(t *testing.T) {
+	h := testHandler(t)
+
+	t.Run("MissingUserIDs", func(t *testing.T) {
+		err := h.Last(context.Background(), &pb.LastRequest{}, &pb.ListResponse{})
+		assert.Equal(t, handler.ErrMissingUserIDs, err)
+	})
+
+	t.Run("NoMatches", func(t *testing.T) {
+		var rsp pb.ListResponse
+		err := h.Last(context.Background(), &pb.LastRequest{
+			UserIds: []string{uuid.New().String()},
+		}, &rsp)
+		assert.NoError(t, err)
+		assert.Empty(t, rsp.Locations)
+	})
+
+	// generate some example data to work with
+	loc1 := &pb.Location{
+		Latitude:  &wrapperspb.DoubleValue{Value: 51.5007},
+		Longitude: &wrapperspb.DoubleValue{Value: 0.1246},
+		Timestamp: timestamppb.New(time.Now()),
+		UserId:    "a",
+	}
+	loc2 := &pb.Location{
+		Latitude:  &wrapperspb.DoubleValue{Value: 51.6007},
+		Longitude: &wrapperspb.DoubleValue{Value: 0.1546},
+		Timestamp: timestamppb.New(time.Now()),
+		UserId:    "b",
+	}
+	loc3 := &pb.Location{
+		Latitude:  &wrapperspb.DoubleValue{Value: 52.6007},
+		Longitude: &wrapperspb.DoubleValue{Value: 0.2546},
+		Timestamp: timestamppb.New(time.Now()),
+		UserId:    loc2.UserId,
+	}
+	err := h.Save(context.TODO(), &pb.SaveRequest{
+		Locations: []*pb.Location{loc1, loc2, loc3},
+	}, &pb.SaveResponse{})
+	assert.NoError(t, err)
+
+	t.Run("OneUser", func(t *testing.T) {
+		var rsp pb.ListResponse
+		err := h.Last(context.Background(), &pb.LastRequest{
+			UserIds: []string{loc2.UserId},
+		}, &rsp)
+		assert.NoError(t, err)
+
+		if len(rsp.Locations) != 1 {
+			t.Fatalf("One location should be returned")
+		}
+		assert.Equal(t, loc3.UserId, rsp.Locations[0].UserId)
+		assert.Equal(t, loc3.Latitude.Value, rsp.Locations[0].Latitude.Value)
+		assert.Equal(t, loc3.Longitude.Value, rsp.Locations[0].Longitude.Value)
+		assert.Equal(t, loc3.Timestamp.AsTime(), rsp.Locations[0].Timestamp.AsTime())
+	})
+	t.Run("ManyUser", func(t *testing.T) {
+		var rsp pb.ListResponse
+		err := h.Last(context.Background(), &pb.LastRequest{
+			UserIds: []string{loc1.UserId, loc2.UserId},
+		}, &rsp)
+		assert.NoError(t, err)
+
+		if len(rsp.Locations) != 2 {
+			t.Fatalf("Two locations should be returned")
+		}
+
+		// sort using user_id so we can hardcode the index
+		sort.Slice(rsp.Locations, func(i, j int) bool {
+			return rsp.Locations[i].UserId > rsp.Locations[j].UserId
+		})
+
+		assert.Equal(t, loc1.UserId, rsp.Locations[1].UserId)
+		assert.Equal(t, loc1.Latitude.Value, rsp.Locations[1].Latitude.Value)
+		assert.Equal(t, loc1.Longitude.Value, rsp.Locations[1].Longitude.Value)
+		assert.Equal(t, loc1.Timestamp.AsTime(), rsp.Locations[1].Timestamp.AsTime())
+
+		assert.Equal(t, loc3.UserId, rsp.Locations[0].UserId)
+		assert.Equal(t, loc3.Latitude.Value, rsp.Locations[0].Latitude.Value)
+		assert.Equal(t, loc3.Longitude.Value, rsp.Locations[0].Longitude.Value)
+		assert.Equal(t, loc3.Timestamp.AsTime(), rsp.Locations[0].Timestamp.AsTime())
+	})
+}
+
+func TestNear(t *testing.T) {
+	lat := &wrapperspb.DoubleValue{Value: 51.510357}
+	lng := &wrapperspb.DoubleValue{Value: -0.116773}
+	rad := &wrapperspb.DoubleValue{Value: 2.0}
+
+	inBoundsLat := &wrapperspb.DoubleValue{Value: 51.5110}
+	inBoundsLng := &wrapperspb.DoubleValue{Value: -0.1142}
+
+	outOfBoundsLat := &wrapperspb.DoubleValue{Value: 51.5415}
+	outOfBoundsLng := &wrapperspb.DoubleValue{Value: -0.0028}
+
+	tt := []struct {
+		Name           string
+		Locations      []*pb.Location
+		Results        []*pb.Location
+		QueryLatitude  *wrapperspb.DoubleValue
+		QueryLongitude *wrapperspb.DoubleValue
+		QueryRadius    *wrapperspb.DoubleValue
+		Error          error
+	}{
+		{
+			Name:           "MissingLatitude",
+			QueryLongitude: lng,
+			QueryRadius:    rad,
+			Error:          handler.ErrMissingLatitude,
+		},
+		{
+			Name:          "MissingLongitude",
+			QueryLatitude: lat,
+			QueryRadius:   rad,
+			Error:         handler.ErrMissingLongitude,
+		},
+		{
+			Name:           "MissingRadius",
+			QueryLatitude:  lat,
+			QueryLongitude: lng,
+			Error:          handler.ErrMissingRadius,
+		},
+		{
+			Name:           "NoLocations",
+			QueryLatitude:  lat,
+			QueryLongitude: lng,
+			QueryRadius:    rad,
+		},
+		{
+			Name:           "OneWithinRadius",
+			QueryLatitude:  lat,
+			QueryLongitude: lng,
+			QueryRadius:    rad,
+			Locations: []*pb.Location{
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "in",
+				},
+				&pb.Location{
+					Latitude:  outOfBoundsLat,
+					Longitude: outOfBoundsLng,
+					UserId:    "out",
+				},
+			},
+			Results: []*pb.Location{
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "in",
+				},
+			},
+		},
+		{
+			Name:           "NoneWithinRadius",
+			QueryLatitude:  lat,
+			QueryLongitude: lng,
+			QueryRadius:    &wrapperspb.DoubleValue{Value: 0.01},
+			Locations: []*pb.Location{
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "in",
+				},
+				&pb.Location{
+					Latitude:  outOfBoundsLat,
+					Longitude: outOfBoundsLng,
+					UserId:    "out",
+				},
+			},
+		},
+		{
+			Name:           "TwoLocationsForUser",
+			QueryLatitude:  lat,
+			QueryLongitude: lng,
+			QueryRadius:    rad,
+			Locations: []*pb.Location{
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "in",
+				},
+				&pb.Location{
+					Latitude:  outOfBoundsLat,
+					Longitude: outOfBoundsLng,
+					UserId:    "out",
+				},
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "out",
+				},
+			},
+			Results: []*pb.Location{
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "in",
+				},
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "out",
+				},
+			},
+		},
+		{
+			Name:           "ManyWithinRadius",
+			QueryLatitude:  lat,
+			QueryLongitude: lng,
+			QueryRadius:    &wrapperspb.DoubleValue{Value: 20},
+			Locations: []*pb.Location{
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "in",
+				},
+				&pb.Location{
+					Latitude:  outOfBoundsLat,
+					Longitude: outOfBoundsLng,
+					UserId:    "out",
+				},
+			},
+			Results: []*pb.Location{
+				&pb.Location{
+					Latitude:  inBoundsLat,
+					Longitude: inBoundsLng,
+					UserId:    "in",
+				},
+				&pb.Location{
+					Latitude:  outOfBoundsLat,
+					Longitude: outOfBoundsLng,
+					UserId:    "out",
+				},
+			},
+		},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.Name, func(t *testing.T) {
+			h := testHandler(t)
+
+			// create the locations
+			if len(tc.Locations) > 0 {
+				err := h.Save(context.TODO(), &pb.SaveRequest{Locations: tc.Locations}, &pb.SaveResponse{})
+				assert.NoError(t, err)
+			}
+
+			// find near locations
+			var rsp pb.ListResponse
+			err := h.Near(context.TODO(), &pb.NearRequest{
+				Latitude:  tc.QueryLatitude,
+				Longitude: tc.QueryLongitude,
+				Radius:    tc.QueryRadius,
+			}, &rsp)
+			assert.Equal(t, tc.Error, err)
+
+			// check the count of the results matches
+			if len(tc.Results) != len(rsp.Locations) {
+				t.Errorf("Incorrect number of results returned. Expected %v, got %v", len(tc.Results), len(rsp.Locations))
+			}
+
+			// validate the results match
+			sort.Slice(rsp.Locations, func(i, j int) bool {
+				return rsp.Locations[i].UserId > rsp.Locations[j].UserId
+			})
+			sort.Slice(tc.Results, func(i, j int) bool {
+				return tc.Results[i].UserId > tc.Results[j].UserId
+			})
+			for i, r := range tc.Results {
+				l := rsp.Locations[i]
+				assert.Equal(t, r.UserId, l.UserId)
+				assert.Equal(t, r.Latitude.Value, l.Latitude.Value)
+				assert.Equal(t, r.Longitude.Value, l.Longitude.Value)
+			}
+		})
+	}
+}
+
+func TestRead(t *testing.T) {
+	h := testHandler(t)
+
+	baseTime := time.Now().Add(time.Hour * -24)
+
+	t.Run("MissingUserIDs", func(t *testing.T) {
+		err := h.Read(context.Background(), &pb.ReadRequest{
+			After:  timestamppb.New(baseTime),
+			Before: timestamppb.New(baseTime),
+		}, &pb.ListResponse{})
+		assert.Equal(t, handler.ErrMissingUserIDs, err)
+	})
+
+	t.Run("MissingAfter", func(t *testing.T) {
+		err := h.Read(context.Background(), &pb.ReadRequest{
+			UserIds: []string{uuid.New().String()},
+			Before:  timestamppb.New(baseTime),
+		}, &pb.ListResponse{})
+		assert.Equal(t, handler.ErrMissingAfter, err)
+	})
+
+	t.Run("MissingBefore", func(t *testing.T) {
+		err := h.Read(context.Background(), &pb.ReadRequest{
+			UserIds: []string{uuid.New().String()},
+			After:   timestamppb.New(baseTime),
+		}, &pb.ListResponse{})
+		assert.Equal(t, handler.ErrMissingBefore, err)
+	})
+
+	// generate some example data to work with
+	loc1 := &pb.Location{
+		Latitude:  &wrapperspb.DoubleValue{Value: 51.5007},
+		Longitude: &wrapperspb.DoubleValue{Value: 0.1246},
+		Timestamp: timestamppb.New(baseTime.Add(time.Minute * 10)),
+		UserId:    "a",
+	}
+	loc2 := &pb.Location{
+		Latitude:  &wrapperspb.DoubleValue{Value: 51.6007},
+		Longitude: &wrapperspb.DoubleValue{Value: 0.1546},
+		Timestamp: timestamppb.New(baseTime.Add(time.Minute * 20)),
+		UserId:    "b",
+	}
+	loc3 := &pb.Location{
+		Latitude:  &wrapperspb.DoubleValue{Value: 52.6007},
+		Longitude: &wrapperspb.DoubleValue{Value: 0.2546},
+		Timestamp: timestamppb.New(baseTime.Add(time.Minute * 40)),
+		UserId:    loc2.UserId,
+	}
+	err := h.Save(context.TODO(), &pb.SaveRequest{
+		Locations: []*pb.Location{loc1, loc2, loc3},
+	}, &pb.SaveResponse{})
+	assert.NoError(t, err)
+
+	t.Run("NoMatches", func(t *testing.T) {
+		var rsp pb.ListResponse
+		err := h.Read(context.Background(), &pb.ReadRequest{
+			UserIds: []string{uuid.New().String()},
+			After:   timestamppb.New(baseTime),
+			Before:  timestamppb.New(baseTime.Add(time.Hour)),
+		}, &rsp)
+		assert.NoError(t, err)
+		assert.Empty(t, rsp.Locations)
+	})
+
+	t.Run("OneUserID", func(t *testing.T) {
+		var rsp pb.ListResponse
+		err := h.Read(context.Background(), &pb.ReadRequest{
+			UserIds: []string{loc2.UserId},
+			After:   timestamppb.New(baseTime),
+			Before:  timestamppb.New(baseTime.Add(time.Hour)),
+		}, &rsp)
+		assert.NoError(t, err)
+
+		if len(rsp.Locations) != 2 {
+			t.Fatalf("Two locations should be returned")
+		}
+		assert.Equal(t, loc2.UserId, rsp.Locations[0].UserId)
+		assert.Equal(t, loc2.Latitude.Value, rsp.Locations[0].Latitude.Value)
+		assert.Equal(t, loc2.Longitude.Value, rsp.Locations[0].Longitude.Value)
+		assert.Equal(t, loc2.Timestamp.AsTime(), rsp.Locations[0].Timestamp.AsTime())
+
+		assert.Equal(t, loc3.UserId, rsp.Locations[1].UserId)
+		assert.Equal(t, loc3.Latitude.Value, rsp.Locations[1].Latitude.Value)
+		assert.Equal(t, loc3.Longitude.Value, rsp.Locations[1].Longitude.Value)
+		assert.Equal(t, loc3.Timestamp.AsTime(), rsp.Locations[1].Timestamp.AsTime())
+	})
+
+	t.Run("OneUserIDReducedTime", func(t *testing.T) {
+		var rsp pb.ListResponse
+		err := h.Read(context.Background(), &pb.ReadRequest{
+			UserIds: []string{loc2.UserId},
+			After:   timestamppb.New(baseTime),
+			Before:  timestamppb.New(baseTime.Add(time.Minute * 30)),
+		}, &rsp)
+		assert.NoError(t, err)
+
+		if len(rsp.Locations) != 1 {
+			t.Fatalf("One location should be returned")
+		}
+		assert.Equal(t, loc2.UserId, rsp.Locations[0].UserId)
+		assert.Equal(t, loc2.Latitude.Value, rsp.Locations[0].Latitude.Value)
+		assert.Equal(t, loc2.Longitude.Value, rsp.Locations[0].Longitude.Value)
+		assert.Equal(t, loc2.Timestamp.AsTime(), rsp.Locations[0].Timestamp.AsTime())
+	})
+
+	t.Run("TwoUserIDs", func(t *testing.T) {
+		var rsp pb.ListResponse
+		err := h.Read(context.Background(), &pb.ReadRequest{
+			UserIds: []string{loc1.UserId, loc2.UserId},
+			After:   timestamppb.New(baseTime),
+			Before:  timestamppb.New(baseTime.Add(time.Minute * 30)),
+		}, &rsp)
+		assert.NoError(t, err)
+
+		if len(rsp.Locations) != 2 {
+			t.Fatalf("Two locations should be returned")
+		}
+		assert.Equal(t, loc1.UserId, rsp.Locations[0].UserId)
+		assert.Equal(t, loc1.Latitude.Value, rsp.Locations[0].Latitude.Value)
+		assert.Equal(t, loc1.Longitude.Value, rsp.Locations[0].Longitude.Value)
+		assert.Equal(t, loc1.Timestamp.AsTime(), rsp.Locations[0].Timestamp.AsTime())
+
+		assert.Equal(t, loc2.UserId, rsp.Locations[1].UserId)
+		assert.Equal(t, loc2.Latitude.Value, rsp.Locations[1].Latitude.Value)
+		assert.Equal(t, loc2.Longitude.Value, rsp.Locations[1].Longitude.Value)
+		assert.Equal(t, loc2.Timestamp.AsTime(), rsp.Locations[1].Timestamp.AsTime())
+	})
+}
--- a/locations/main.go
+++ b/locations/main.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	geo "github.com/hailocab/go-geoindex"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+
+	"github.com/micro/services/locations/handler"
+	"github.com/micro/services/locations/model"
+	pb "github.com/micro/services/locations/proto"
+
+	"github.com/micro/micro/v3/service"
+	"github.com/micro/micro/v3/service/config"
+	"github.com/micro/micro/v3/service/logger"
+)
+
+var dbAddress = "postgresql://postgres@localhost:5432/locations?sslmode=disable"
+
+func main() {
+	// Create service
+	srv := service.New(
+		service.Name("locations"),
+		service.Version("latest"),
+	)
+
+	// Connect to the database
+	cfg, err := config.Get("locations.database")
+	if err != nil {
+		logger.Fatalf("Error loading config: %v", err)
+	}
+	addr := cfg.String(dbAddress)
+	db, err := gorm.Open(postgres.Open(addr), &gorm.Config{})
+	if err != nil {
+		logger.Fatalf("Error connecting to database: %v", err)
+	}
+
+	// Migrate the database
+	if err := db.AutoMigrate(&model.Location{}); err != nil {
+		logger.Fatalf("Error migrating database: %v", err)
+	}
+
+	// Register handler
+	pb.RegisterLocationsHandler(srv.Server(), &handler.Locations{
+		DB: db, Geoindex: geo.NewPointsIndex(geo.Km(0.1)),
+	})
+
+	// Run service
+	if err := srv.Run(); err != nil {
+		logger.Fatal(err)
+	}
+}
--- a/locations/micro.mu
+++ b/locations/micro.mu
@@ -0,0 +1 @@
+service locations
--- a/locations/model/location.go
+++ b/locations/model/location.go
@@ -0,0 +1,26 @@
+package model
+
+import (
+	"time"
+)
+
+type Location struct {
+	ID        string
+	UserID    string `gorm:"index"`
+	Latitude  float64
+	Longitude float64
+	Timestamp time.Time
+}
+
+// use the user id for the geoindex so only one result is returned per user
+func (l *Location) Id() string {
+	return l.UserID
+}
+
+func (l *Location) Lat() float64 {
+	return l.Latitude
+}
+
+func (l *Location) Lon() float64 {
+	return l.Longitude
+}
--- a/locations/proto/locations.pb.go
+++ b/locations/proto/locations.pb.go
@@ -0,0 +1,643 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
+// source: proto/locations.proto
+
+package locations
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	timestamp "github.com/golang/protobuf/ptypes/timestamp"
+	wrappers "github.com/golang/protobuf/ptypes/wrappers"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type Location struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	UserId    string                `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
+	Timestamp *timestamp.Timestamp  `protobuf:"bytes,2,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	Latitude  *wrappers.DoubleValue `protobuf:"bytes,3,opt,name=latitude,proto3" json:"latitude,omitempty"`
+	Longitude *wrappers.DoubleValue `protobuf:"bytes,4,opt,name=longitude,proto3" json:"longitude,omitempty"`
+}
+
+func (x *Location) Reset() {
+	*x = Location{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_locations_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Location) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Location) ProtoMessage() {}
+
+func (x *Location) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_locations_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Location.ProtoReflect.Descriptor instead.
+func (*Location) Descriptor() ([]byte, []int) {
+	return file_proto_locations_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Location) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
+func (x *Location) GetTimestamp() *timestamp.Timestamp {
+	if x != nil {
+		return x.Timestamp
+	}
+	return nil
+}
+
+func (x *Location) GetLatitude() *wrappers.DoubleValue {
+	if x != nil {
+		return x.Latitude
+	}
+	return nil
+}
+
+func (x *Location) GetLongitude() *wrappers.DoubleValue {
+	if x != nil {
+		return x.Longitude
+	}
+	return nil
+}
+
+type SaveRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Locations []*Location `protobuf:"bytes,1,rep,name=locations,proto3" json:"locations,omitempty"`
+}
+
+func (x *SaveRequest) Reset() {
+	*x = SaveRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_locations_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SaveRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SaveRequest) ProtoMessage() {}
+
+func (x *SaveRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_locations_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SaveRequest.ProtoReflect.Descriptor instead.
+func (*SaveRequest) Descriptor() ([]byte, []int) {
+	return file_proto_locations_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *SaveRequest) GetLocations() []*Location {
+	if x != nil {
+		return x.Locations
+	}
+	return nil
+}
+
+type SaveResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *SaveResponse) Reset() {
+	*x = SaveResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_locations_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SaveResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SaveResponse) ProtoMessage() {}
+
+func (x *SaveResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_locations_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SaveResponse.ProtoReflect.Descriptor instead.
+func (*SaveResponse) Descriptor() ([]byte, []int) {
+	return file_proto_locations_proto_rawDescGZIP(), []int{2}
+}
+
+type LastRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	UserIds []string `protobuf:"bytes,1,rep,name=user_ids,json=userIds,proto3" json:"user_ids,omitempty"`
+}
+
+func (x *LastRequest) Reset() {
+	*x = LastRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_locations_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *LastRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*LastRequest) ProtoMessage() {}
+
+func (x *LastRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_locations_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use LastRequest.ProtoReflect.Descriptor instead.
+func (*LastRequest) Descriptor() ([]byte, []int) {
+	return file_proto_locations_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *LastRequest) GetUserIds() []string {
+	if x != nil {
+		return x.UserIds
+	}
+	return nil
+}
+
+type ListResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Locations []*Location `protobuf:"bytes,1,rep,name=locations,proto3" json:"locations,omitempty"`
+}
+
+func (x *ListResponse) Reset() {
+	*x = ListResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_locations_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ListResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ListResponse) ProtoMessage() {}
+
+func (x *ListResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_locations_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ListResponse.ProtoReflect.Descriptor instead.
+func (*ListResponse) Descriptor() ([]byte, []int) {
+	return file_proto_locations_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *ListResponse) GetLocations() []*Location {
+	if x != nil {
+		return x.Locations
+	}
+	return nil
+}
+
+type NearRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Latitude  *wrappers.DoubleValue `protobuf:"bytes,1,opt,name=latitude,proto3" json:"latitude,omitempty"`
+	Longitude *wrappers.DoubleValue `protobuf:"bytes,2,opt,name=longitude,proto3" json:"longitude,omitempty"`
+	// radius to search within, units km
+	Radius *wrappers.DoubleValue `protobuf:"bytes,3,opt,name=radius,proto3" json:"radius,omitempty"`
+}
+
+func (x *NearRequest) Reset() {
+	*x = NearRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_locations_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *NearRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NearRequest) ProtoMessage() {}
+
+func (x *NearRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_locations_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use NearRequest.ProtoReflect.Descriptor instead.
+func (*NearRequest) Descriptor() ([]byte, []int) {
+	return file_proto_locations_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *NearRequest) GetLatitude() *wrappers.DoubleValue {
+	if x != nil {
+		return x.Latitude
+	}
+	return nil
+}
+
+func (x *NearRequest) GetLongitude() *wrappers.DoubleValue {
+	if x != nil {
+		return x.Longitude
+	}
+	return nil
+}
+
+func (x *NearRequest) GetRadius() *wrappers.DoubleValue {
+	if x != nil {
+		return x.Radius
+	}
+	return nil
+}
+
+type ReadRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	UserIds []string             `protobuf:"bytes,1,rep,name=user_ids,json=userIds,proto3" json:"user_ids,omitempty"`
+	After   *timestamp.Timestamp `protobuf:"bytes,2,opt,name=after,proto3" json:"after,omitempty"`
+	Before  *timestamp.Timestamp `protobuf:"bytes,3,opt,name=before,proto3" json:"before,omitempty"`
+}
+
+func (x *ReadRequest) Reset() {
+	*x = ReadRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_locations_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ReadRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ReadRequest) ProtoMessage() {}
+
+func (x *ReadRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_locations_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ReadRequest.ProtoReflect.Descriptor instead.
+func (*ReadRequest) Descriptor() ([]byte, []int) {
+	return file_proto_locations_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *ReadRequest) GetUserIds() []string {
+	if x != nil {
+		return x.UserIds
+	}
+	return nil
+}
+
+func (x *ReadRequest) GetAfter() *timestamp.Timestamp {
+	if x != nil {
+		return x.After
+	}
+	return nil
+}
+
+func (x *ReadRequest) GetBefore() *timestamp.Timestamp {
+	if x != nil {
+		return x.Before
+	}
+	return nil
+}
+
+var File_proto_locations_proto protoreflect.FileDescriptor
+
+var file_proto_locations_proto_rawDesc = []byte{
+	0x0a, 0x15, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x6c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e,
+	0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x09, 0x6c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f,
+	0x6e, 0x73, 0x1a, 0x1f, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x62, 0x75, 0x66, 0x2f, 0x74, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x2e, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x1a, 0x1e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x62, 0x75, 0x66, 0x2f, 0x77, 0x72, 0x61, 0x70, 0x70, 0x65, 0x72, 0x73, 0x2e, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x22, 0xd3, 0x01, 0x0a, 0x08, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e,
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+}
+
+var (
+	file_proto_locations_proto_rawDescOnce sync.Once
+	file_proto_locations_proto_rawDescData = file_proto_locations_proto_rawDesc
+)
+
+func file_proto_locations_proto_rawDescGZIP() []byte {
+	file_proto_locations_proto_rawDescOnce.Do(func() {
+		file_proto_locations_proto_rawDescData = protoimpl.X.CompressGZIP(file_proto_locations_proto_rawDescData)
+	})
+	return file_proto_locations_proto_rawDescData
+}
+
+var file_proto_locations_proto_msgTypes = make([]protoimpl.MessageInfo, 7)
+var file_proto_locations_proto_goTypes = []interface{}{
+	(*Location)(nil),             // 0: locations.Location
+	(*SaveRequest)(nil),          // 1: locations.SaveRequest
+	(*SaveResponse)(nil),         // 2: locations.SaveResponse
+	(*LastRequest)(nil),          // 3: locations.LastRequest
+	(*ListResponse)(nil),         // 4: locations.ListResponse
+	(*NearRequest)(nil),          // 5: locations.NearRequest
+	(*ReadRequest)(nil),          // 6: locations.ReadRequest
+	(*timestamp.Timestamp)(nil),  // 7: google.protobuf.Timestamp
+	(*wrappers.DoubleValue)(nil), // 8: google.protobuf.DoubleValue
+}
+var file_proto_locations_proto_depIdxs = []int32{
+	7,  // 0: locations.Location.timestamp:type_name -> google.protobuf.Timestamp
+	8,  // 1: locations.Location.latitude:type_name -> google.protobuf.DoubleValue
+	8,  // 2: locations.Location.longitude:type_name -> google.protobuf.DoubleValue
+	0,  // 3: locations.SaveRequest.locations:type_name -> locations.Location
+	0,  // 4: locations.ListResponse.locations:type_name -> locations.Location
+	8,  // 5: locations.NearRequest.latitude:type_name -> google.protobuf.DoubleValue
+	8,  // 6: locations.NearRequest.longitude:type_name -> google.protobuf.DoubleValue
+	8,  // 7: locations.NearRequest.radius:type_name -> google.protobuf.DoubleValue
+	7,  // 8: locations.ReadRequest.after:type_name -> google.protobuf.Timestamp
+	7,  // 9: locations.ReadRequest.before:type_name -> google.protobuf.Timestamp
+	1,  // 10: locations.Locations.Save:input_type -> locations.SaveRequest
+	3,  // 11: locations.Locations.Last:input_type -> locations.LastRequest
+	5,  // 12: locations.Locations.Near:input_type -> locations.NearRequest
+	6,  // 13: locations.Locations.Read:input_type -> locations.ReadRequest
+	2,  // 14: locations.Locations.Save:output_type -> locations.SaveResponse
+	4,  // 15: locations.Locations.Last:output_type -> locations.ListResponse
+	4,  // 16: locations.Locations.Near:output_type -> locations.ListResponse
+	4,  // 17: locations.Locations.Read:output_type -> locations.ListResponse
+	14, // [14:18] is the sub-list for method output_type
+	10, // [10:14] is the sub-list for method input_type
+	10, // [10:10] is the sub-list for extension type_name
+	10, // [10:10] is the sub-list for extension extendee
+	0,  // [0:10] is the sub-list for field type_name
+}
+
+func init() { file_proto_locations_proto_init() }
+func file_proto_locations_proto_init() {
+	if File_proto_locations_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_proto_locations_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Location); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_locations_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SaveRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_locations_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SaveResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_locations_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*LastRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_locations_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ListResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_locations_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*NearRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_locations_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReadRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_proto_locations_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   7,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_proto_locations_proto_goTypes,
+		DependencyIndexes: file_proto_locations_proto_depIdxs,
+		MessageInfos:      file_proto_locations_proto_msgTypes,
+	}.Build()
+	File_proto_locations_proto = out.File
+	file_proto_locations_proto_rawDesc = nil
+	file_proto_locations_proto_goTypes = nil
+	file_proto_locations_proto_depIdxs = nil
+}
--- a/locations/proto/locations.pb.micro.go
+++ b/locations/proto/locations.pb.micro.go
@@ -0,0 +1,154 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: proto/locations.proto
+
+package locations
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	_ "github.com/golang/protobuf/ptypes/timestamp"
+	_ "github.com/golang/protobuf/ptypes/wrappers"
+	math "math"
+)
+
+import (
+	context "context"
+	api "github.com/micro/micro/v3/service/api"
+	client "github.com/micro/micro/v3/service/client"
+	server "github.com/micro/micro/v3/service/server"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ api.Endpoint
+var _ context.Context
+var _ client.Option
+var _ server.Option
+
+// Api Endpoints for Locations service
+
+func NewLocationsEndpoints() []*api.Endpoint {
+	return []*api.Endpoint{}
+}
+
+// Client API for Locations service
+
+type LocationsService interface {
+	// Save a set of locations
+	Save(ctx context.Context, in *SaveRequest, opts ...client.CallOption) (*SaveResponse, error)
+	// Last locations for a set of users
+	Last(ctx context.Context, in *LastRequest, opts ...client.CallOption) (*ListResponse, error)
+	// Near returns the locations near a point at a given time
+	Near(ctx context.Context, in *NearRequest, opts ...client.CallOption) (*ListResponse, error)
+	// Read locations for a group of users between two points in time
+	Read(ctx context.Context, in *ReadRequest, opts ...client.CallOption) (*ListResponse, error)
+}
+
+type locationsService struct {
+	c    client.Client
+	name string
+}
+
+func NewLocationsService(name string, c client.Client) LocationsService {
+	return &locationsService{
+		c:    c,
+		name: name,
+	}
+}
+
+func (c *locationsService) Save(ctx context.Context, in *SaveRequest, opts ...client.CallOption) (*SaveResponse, error) {
+	req := c.c.NewRequest(c.name, "Locations.Save", in)
+	out := new(SaveResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *locationsService) Last(ctx context.Context, in *LastRequest, opts ...client.CallOption) (*ListResponse, error) {
+	req := c.c.NewRequest(c.name, "Locations.Last", in)
+	out := new(ListResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *locationsService) Near(ctx context.Context, in *NearRequest, opts ...client.CallOption) (*ListResponse, error) {
+	req := c.c.NewRequest(c.name, "Locations.Near", in)
+	out := new(ListResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *locationsService) Read(ctx context.Context, in *ReadRequest, opts ...client.CallOption) (*ListResponse, error) {
+	req := c.c.NewRequest(c.name, "Locations.Read", in)
+	out := new(ListResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Locations service
+
+type LocationsHandler interface {
+	// Save a set of locations
+	Save(context.Context, *SaveRequest, *SaveResponse) error
+	// Last locations for a set of users
+	Last(context.Context, *LastRequest, *ListResponse) error
+	// Near returns the locations near a point at a given time
+	Near(context.Context, *NearRequest, *ListResponse) error
+	// Read locations for a group of users between two points in time
+	Read(context.Context, *ReadRequest, *ListResponse) error
+}
+
+func RegisterLocationsHandler(s server.Server, hdlr LocationsHandler, opts ...server.HandlerOption) error {
+	type locations interface {
+		Save(ctx context.Context, in *SaveRequest, out *SaveResponse) error
+		Last(ctx context.Context, in *LastRequest, out *ListResponse) error
+		Near(ctx context.Context, in *NearRequest, out *ListResponse) error
+		Read(ctx context.Context, in *ReadRequest, out *ListResponse) error
+	}
+	type Locations struct {
+		locations
+	}
+	h := &locationsHandler{hdlr}
+	return s.Handle(s.NewHandler(&Locations{h}, opts...))
+}
+
+type locationsHandler struct {
+	LocationsHandler
+}
+
+func (h *locationsHandler) Save(ctx context.Context, in *SaveRequest, out *SaveResponse) error {
+	return h.LocationsHandler.Save(ctx, in, out)
+}
+
+func (h *locationsHandler) Last(ctx context.Context, in *LastRequest, out *ListResponse) error {
+	return h.LocationsHandler.Last(ctx, in, out)
+}
+
+func (h *locationsHandler) Near(ctx context.Context, in *NearRequest, out *ListResponse) error {
+	return h.LocationsHandler.Near(ctx, in, out)
+}
+
+func (h *locationsHandler) Read(ctx context.Context, in *ReadRequest, out *ListResponse) error {
+	return h.LocationsHandler.Read(ctx, in, out)
+}
--- a/locations/proto/locations.proto
+++ b/locations/proto/locations.proto
@@ -0,0 +1,52 @@
+syntax = "proto3";
+
+package locations;
+option go_package = "github.com/micro/services/locations/proto;locations";
+
+import "google/protobuf/timestamp.proto";
+import "google/protobuf/wrappers.proto";
+
+service Locations {
+	// Save a set of locations
+	rpc Save(SaveRequest) returns (SaveResponse) {}
+	// Last locations for a set of users
+	rpc Last(LastRequest) returns (ListResponse) {}
+	// Near returns the locations near a point at a given time
+	rpc Near(NearRequest) returns (ListResponse) {}	
+	// Read locations for a group of users between two points in time
+	rpc Read(ReadRequest) returns (ListResponse) {}
+}
+
+message Location {
+	string user_id = 1;
+	google.protobuf.Timestamp timestamp = 2;
+	google.protobuf.DoubleValue latitude = 3;
+	google.protobuf.DoubleValue longitude = 4;
+}
+
+message SaveRequest {
+	repeated Location locations = 1;
+}
+
+message SaveResponse {}
+
+message LastRequest {
+	repeated string user_ids = 1;
+}
+
+message ListResponse {
+	repeated Location locations = 1;
+}
+
+message NearRequest {
+	google.protobuf.DoubleValue latitude = 1;
+	google.protobuf.DoubleValue longitude = 2;
+	// radius to search within, units km
+	google.protobuf.DoubleValue radius = 3;
+}
+
+message ReadRequest {
+	repeated string user_ids = 1;
+	google.protobuf.Timestamp after = 2;
+	google.protobuf.Timestamp before = 3;
+}