grpc: implement health check in go services (#27)

Also locked grpc-go to =1.14 exact version.
See grpc/grpc-go#2314 and grpc/grpc-go#2313 for reference

kubernetes-manifests/checkoutservice.yaml

@@ -28,13 +28,11 @@ spec:
           ports:
           - containerPort: 5050
           readinessProbe:
-            periodSeconds: 5
+            exec:
-            tcpSocket:
+              command: ["/bin/grpc_health_probe", "-addr=:5050"]
-              port: 5050
           livenessProbe:
-            periodSeconds: 5
+            exec:
-            tcpSocket:
+              command: ["/bin/grpc_health_probe", "-addr=:5050"]
-              port: 5050
           env:
           - name: PRODUCT_CATALOG_SERVICE_ADDR
             value: "productcatalogservice:3550"

kubernetes-manifests/productcatalogservice.yaml

@@ -29,13 +29,11 @@ spec:
         ports:
         - containerPort: 3550
         readinessProbe:
-          periodSeconds: 5
+          exec:
-          tcpSocket:
+            command: ["/bin/grpc_health_probe", "-addr=:3550"]
-            port: 3550
         livenessProbe:
-          periodSeconds: 5
+          exec:
-          tcpSocket:
+            command: ["/bin/grpc_health_probe", "-addr=:3550"]
-            port: 3550
         resources:
           requests:
             cpu: 100m

kubernetes-manifests/shippingservice.yaml

@@ -29,12 +29,11 @@ spec:
         - containerPort: 50051
         readinessProbe:
           periodSeconds: 5
-          tcpSocket:
+          exec:
-            port: 50051
+            command: ["/bin/grpc_health_probe", "-addr=:50051"]
         livenessProbe:
-          periodSeconds: 5
+          exec:
-          tcpSocket:
+            command: ["/bin/grpc_health_probe", "-addr=:50051"]
-            port: 50051
         resources:
           requests:
             cpu: 100m

src/checkoutservice/Dockerfile

@@ -15,6 +15,9 @@ RUN go build -gcflags='-N -l' -o /checkoutservice .
 
 FROM alpine as release
 RUN apk add --no-cache ca-certificates
+RUN GRPC_HEALTH_PROBE_VERSION=v0.1.0-alpha.1 && \
+    wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-amd64 && \
+    chmod +x /bin/grpc_health_probe
 COPY --from=builder /checkoutservice /checkoutservice
 EXPOSE 5050
 ENTRYPOINT ["/checkoutservice"]

src/checkoutservice/Gopkg.lock

@@ -2,43 +2,27 @@
 
 
 [[projects]]
-  digest = "1:467af0aad47996b25b838d6f14c8371123a8a76ec239020a6c5894e1f8f60272"
   name = "cloud.google.com/go"
   packages = [
     "compute/metadata",
     "internal/version",
     "monitoring/apiv3",
     "profiler",
-    "trace/apiv2",
+    "trace/apiv2"
   ]
-  pruneopts = "UT"
   revision = "c728a003b238b26cef9ab6753a5dc424b331c3ad"
   version = "v0.27.0"
 
 [[projects]]
-  digest = "1:9fe70def8f0ceb3d455a0acad9dadd6632287cdbf9c8c2ea50e8dabe2ade40c4"
   name = "contrib.go.opencensus.io/exporter/stackdriver"
   packages = [
     ".",
-    "propagation",
+    "propagation"
   ]
-  pruneopts = "UT"
   revision = "37aa2801fbf0205003e15636096ebf0373510288"
   version = "v0.5.0"
 
 [[projects]]
-  branch = "master"
-  digest = "1:f5961cd4f136ee9f3a80ca62a05ecc4fb60107d6a323ae258a1c732b76861809"
-  name = "github.com/GoogleCloudPlatform/microservices-demo"
-  packages = [
-    "src/checkoutservice/genproto",
-    "src/checkoutservice/money",
-  ]
-  pruneopts = "UT"
-  revision = "6d969441585ade8c91c235115c7cdb12ac61354f"
-
-[[projects]]
-  digest = "1:72856926f8208767b837bf51e3373f49139f61889b67dc7fd3c2a0fd711e3f7a"
   name = "github.com/golang/protobuf"
   packages = [
     "proto",
@@ -49,38 +33,30 @@
     "ptypes/empty",
     "ptypes/struct",
     "ptypes/timestamp",
-    "ptypes/wrappers",
+    "ptypes/wrappers"
   ]
-  pruneopts = "UT"
   revision = "aa810b61a9c79d51363740d207bb46cf8e620ed5"
   version = "v1.2.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:089d56c0adb79140365b5c86815ce97233986da6f3a525c6b706773e4b83876f"
   name = "github.com/google/pprof"
   packages = ["profile"]
-  pruneopts = "UT"
+  revision = "e027b505a088ac3c68c339a1d7ce7724bf34538b"
-  revision = "84b7d314e22c8d12334e52726f68517973b6027b"
 
 [[projects]]
-  digest = "1:3a26588bc48b96825977c1b3df964f8fd842cd6860cc26370588d3563433cf11"
   name = "github.com/google/uuid"
   packages = ["."]
-  pruneopts = "UT"
   revision = "d460ce9f8df2e77fb1ba55ca87fafed96c607494"
   version = "v1.0.0"
 
 [[projects]]
-  digest = "1:e145e9710a10bc114a6d3e2738aadf8de146adaa031854ffdf7bbfe15da85e63"
   name = "github.com/googleapis/gax-go"
   packages = ["."]
-  pruneopts = "UT"
   revision = "317e0006254c44a0ac427cc52a0e083ff0b9622f"
   version = "v2.0.0"
 
 [[projects]]
-  digest = "1:1bb914cfb78f68f488a91cd7872d3d06a5f83c5bbacf0296dbef44e120b00a91"
   name = "go.opencensus.io"
   packages = [
     ".",
@@ -96,15 +72,13 @@
     "trace",
     "trace/internal",
     "trace/propagation",
-    "trace/tracestate",
+    "trace/tracestate"
   ]
-  pruneopts = "UT"
   revision = "b11f239c032624b045c4c2bfd3d1287b4012ce89"
   version = "v0.16.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:1c14517b2f106c61d75006199b46a46576058661d469658cb0f90739919641d2"
   name = "golang.org/x/net"
   packages = [
     "context",
@@ -114,43 +88,35 @@
     "http2/hpack",
     "idna",
     "internal/timeseries",
-    "trace",
+    "trace"
   ]
-  pruneopts = "UT"
   revision = "26e67e76b6c3f6ce91f7c52def5af501b4e0f3a2"
 
 [[projects]]
   branch = "master"
-  digest = "1:f645667d687fc8bf228865a2c5455824ef05bad08841e673673ef2bb89ac5b90"
   name = "golang.org/x/oauth2"
   packages = [
     ".",
     "google",
     "internal",
     "jws",
-    "jwt",
+    "jwt"
   ]
-  pruneopts = "UT"
   revision = "d2e6202438beef2727060aa7cabdd924d92ebfd9"
 
 [[projects]]
   branch = "master"
-  digest = "1:e0140c0c868c6e0f01c0380865194592c011fe521d6e12d78bfd33e756fe018a"
   name = "golang.org/x/sync"
   packages = ["semaphore"]
-  pruneopts = "UT"
   revision = "1d60e4601c6fd243af51cc01ddf169918a5407ca"
 
 [[projects]]
   branch = "master"
-  digest = "1:6eb2645d74b43d9c87b51947df39f7c668a4f422cd512053f7f6f75bfaad0197"
   name = "golang.org/x/sys"
   packages = ["unix"]
-  pruneopts = "UT"
+  revision = "1561086e645b2809fb9f8a1e2a38160bf8d53bf4"
-  revision = "d0be0721c37eeb5299f245a996a483160fc36940"
 
 [[projects]]
-  digest = "1:a2ab62866c75542dd18d2b069fec854577a20211d7c0ea6ae746072a1dccdd18"
   name = "golang.org/x/text"
   packages = [
     "collate",
@@ -166,15 +132,13 @@
     "unicode/bidi",
     "unicode/cldr",
     "unicode/norm",
-    "unicode/rangetable",
+    "unicode/rangetable"
   ]
-  pruneopts = "UT"
   revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
   version = "v0.3.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:e9e388241f9f0f02000dddaeeb91153d53f0cd09dcec33879cc7e043a2e65d75"
   name = "google.golang.org/api"
   packages = [
     "googleapi/transport",
@@ -184,13 +148,11 @@
     "support/bundler",
     "transport",
     "transport/grpc",
-    "transport/http",
+    "transport/http"
   ]
-  pruneopts = "UT"
+  revision = "19ff8768a5c0b8e46ea281065664787eefc24121"
-  revision = "7ca32eb868bf53ea2fc406698eb98583a8073d19"
 
 [[projects]]
-  digest = "1:26619fcd2452b4044174d26acd8b09c09dffee9a1c3a22d2383b873aa9a0131f"
   name = "google.golang.org/appengine"
   packages = [
     ".",
@@ -204,15 +166,13 @@
     "internal/socket",
     "internal/urlfetch",
     "socket",
-    "urlfetch",
+    "urlfetch"
   ]
-  pruneopts = "UT"
+  revision = "ae0ab99deb4dc413a2b4bd6c8bdd0eb67f1e4d06"
-  revision = "b1f26356af11148e710935ed1ac8a7f5702c7612"
+  version = "v1.2.0"
-  version = "v1.1.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:7a3da01a8f840fbbef1f027dc091ae52a29c6ab9374e126b6bdc5bf3b0ff2687"
   name = "google.golang.org/genproto"
   packages = [
     "googleapis/api/annotations",
@@ -225,13 +185,11 @@
     "googleapis/monitoring/v3",
     "googleapis/rpc/errdetails",
     "googleapis/rpc/status",
-    "protobuf/field_mask",
+    "protobuf/field_mask"
   ]
-  pruneopts = "UT"
+  revision = "c3f76f3b92d1ffa4c58a9ff842a58b8877655e0f"
-  revision = "36d5787dc5356b711fe8f3040271aaf51c35955b"
 
 [[projects]]
-  digest = "1:4ad047d772a7d4841687df9534a767a9e243885ed6d7d2ced6af5995a5dc44b3"
   name = "google.golang.org/grpc"
   packages = [
     ".",
@@ -245,6 +203,7 @@
     "encoding",
     "encoding/proto",
     "grpclog",
+    "health/grpc_health_v1",
     "internal",
     "internal/backoff",
     "internal/channelz",
@@ -260,29 +219,14 @@
     "resolver/passthrough",
     "stats",
     "status",
-    "tap",
+    "tap"
   ]
-  pruneopts = "UT"
+  revision = "32fb0ac620c32ba40a4626ddf94d90d12cce3455"
-  revision = "8dea3dc473e90c8179e519d91302d0597c0ca1d1"
+  version = "v1.14.0"
-  version = "v1.15.0"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  input-imports = [
+  inputs-digest = "0c103e5e32d8ecdd70048b6d91e02b910e30bad54f06b230a9664f585433a669"
-    "cloud.google.com/go/profiler",
-    "contrib.go.opencensus.io/exporter/stackdriver",
-    "github.com/GoogleCloudPlatform/microservices-demo/src/checkoutservice/genproto",
-    "github.com/GoogleCloudPlatform/microservices-demo/src/checkoutservice/money",
-    "github.com/golang/protobuf/proto",
-    "github.com/google/uuid",
-    "go.opencensus.io/plugin/ocgrpc",
-    "go.opencensus.io/stats/view",
-    "go.opencensus.io/trace",
-    "golang.org/x/net/context",
-    "google.golang.org/grpc",
-    "google.golang.org/grpc/codes",
-    "google.golang.org/grpc/status",
-  ]
   solver-name = "gps-cdcl"
   solver-version = 1

src/checkoutservice/Gopkg.toml

@@ -33,10 +33,6 @@
   name = "contrib.go.opencensus.io/exporter/stackdriver"
   version = "0.5.0"
 
-[[constraint]]
-  branch = "master"
-  name = "github.com/GoogleCloudPlatform/microservices-demo"
-
 [[constraint]]
   name = "github.com/golang/protobuf"
   version = "1.2.0"
@@ -55,7 +51,7 @@
 
 [[constraint]]
   name = "google.golang.org/grpc"
-  version = "1.15.0"
+  version = "=1.14.0"
 
 [prune]
   go-tests = true

src/checkoutservice/main.go

@@ -34,6 +34,7 @@ import (
 
 	pb "github.com/GoogleCloudPlatform/microservices-demo/src/checkoutservice/genproto"
 	money "github.com/GoogleCloudPlatform/microservices-demo/src/checkoutservice/money"
+	healthpb "google.golang.org/grpc/health/grpc_health_v1"
 )
 
 const (
@@ -75,6 +76,7 @@ func main() {
 	}
 	srv := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
 	pb.RegisterCheckoutServiceServer(srv, svc)
+	healthpb.RegisterHealthServer(srv, svc)
 	log.Printf("starting to listen on tcp: %q", lis.Addr().String())
 	log.Fatal(srv.Serve(lis))
 }
@@ -141,6 +143,10 @@ func mustMapEnv(target *string, envKey string) {
 	*target = v
 }
 
+func (cs *checkoutService) Check(ctx context.Context, req *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
+	return &healthpb.HealthCheckResponse{Status: healthpb.HealthCheckResponse_SERVING}, nil
+}
+
 func (cs *checkoutService) PlaceOrder(ctx context.Context, req *pb.PlaceOrderRequest) (*pb.PlaceOrderResponse, error) {
 	log.Printf("[PlaceOrder] user_id=%q user_currency=%q", req.UserId, req.UserCurrency)
 

src/productcatalogservice/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.10-alpine as builder
+FROM golang:1.10-alpine AS builder
 RUN apk add --no-cache ca-certificates git && \
       wget -qO/go/bin/dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 && \
       chmod +x /go/bin/dep
@@ -13,8 +13,11 @@ RUN dep ensure --vendor-only -v
 COPY . .
 RUN go build -o /productcatalogservice .
 
-FROM alpine as release
+FROM alpine AS release
 RUN apk add --no-cache ca-certificates
+RUN GRPC_HEALTH_PROBE_VERSION=v0.1.0-alpha.1 && \
+    wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-amd64 && \
+    chmod +x /bin/grpc_health_probe
 WORKDIR /productcatalogservice
 COPY --from=builder /productcatalogservice ./server
 COPY products.json .

src/productcatalogservice/Gopkg.lock

@@ -2,40 +2,27 @@
 
 
 [[projects]]
-  digest = "1:467af0aad47996b25b838d6f14c8371123a8a76ec239020a6c5894e1f8f60272"
   name = "cloud.google.com/go"
   packages = [
     "compute/metadata",
     "internal/version",
     "monitoring/apiv3",
     "profiler",
-    "trace/apiv2",
+    "trace/apiv2"
   ]
-  pruneopts = "UT"
   revision = "c728a003b238b26cef9ab6753a5dc424b331c3ad"
   version = "v0.27.0"
 
 [[projects]]
-  digest = "1:9fe70def8f0ceb3d455a0acad9dadd6632287cdbf9c8c2ea50e8dabe2ade40c4"
   name = "contrib.go.opencensus.io/exporter/stackdriver"
   packages = [
     ".",
-    "propagation",
+    "propagation"
   ]
-  pruneopts = "UT"
   revision = "37aa2801fbf0205003e15636096ebf0373510288"
   version = "v0.5.0"
 
 [[projects]]
-  branch = "master"
-  digest = "1:c82c943645b21ca2fd3f9d248df1ca5f9055fb5fea5cf4145472163f198ed5df"
-  name = "github.com/GoogleCloudPlatform/microservices-demo"
-  packages = ["src/productcatalogservice/genproto"]
-  pruneopts = "UT"
-  revision = "6d969441585ade8c91c235115c7cdb12ac61354f"
-
-[[projects]]
-  digest = "1:4fbf68bee2a60f6af6414572936edb295f6f26b73c6fb25ab0e7b03b013854f5"
   name = "github.com/golang/protobuf"
   packages = [
     "jsonpb",
@@ -47,43 +34,35 @@
     "ptypes/empty",
     "ptypes/struct",
     "ptypes/timestamp",
-    "ptypes/wrappers",
+    "ptypes/wrappers"
   ]
-  pruneopts = "UT"
   revision = "aa810b61a9c79d51363740d207bb46cf8e620ed5"
   version = "v1.2.0"
 
 [[projects]]
-  digest = "1:2e3c336fc7fde5c984d2841455a658a6d626450b1754a854b3b32e7a8f49a07a"
   name = "github.com/google/go-cmp"
   packages = [
     "cmp",
     "cmp/internal/diff",
     "cmp/internal/function",
-    "cmp/internal/value",
+    "cmp/internal/value"
   ]
-  pruneopts = "UT"
   revision = "3af367b6b30c263d47e8895973edcca9a49cf029"
   version = "v0.2.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:089d56c0adb79140365b5c86815ce97233986da6f3a525c6b706773e4b83876f"
   name = "github.com/google/pprof"
   packages = ["profile"]
-  pruneopts = "UT"
+  revision = "e027b505a088ac3c68c339a1d7ce7724bf34538b"
-  revision = "84b7d314e22c8d12334e52726f68517973b6027b"
 
 [[projects]]
-  digest = "1:e145e9710a10bc114a6d3e2738aadf8de146adaa031854ffdf7bbfe15da85e63"
   name = "github.com/googleapis/gax-go"
   packages = ["."]
-  pruneopts = "UT"
   revision = "317e0006254c44a0ac427cc52a0e083ff0b9622f"
   version = "v2.0.0"
 
 [[projects]]
-  digest = "1:1bb914cfb78f68f488a91cd7872d3d06a5f83c5bbacf0296dbef44e120b00a91"
   name = "go.opencensus.io"
   packages = [
     ".",
@@ -99,15 +78,13 @@
     "trace",
     "trace/internal",
     "trace/propagation",
-    "trace/tracestate",
+    "trace/tracestate"
   ]
-  pruneopts = "UT"
   revision = "b11f239c032624b045c4c2bfd3d1287b4012ce89"
   version = "v0.16.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:1c14517b2f106c61d75006199b46a46576058661d469658cb0f90739919641d2"
   name = "golang.org/x/net"
   packages = [
     "context",
@@ -117,43 +94,35 @@
     "http2/hpack",
     "idna",
     "internal/timeseries",
-    "trace",
+    "trace"
   ]
-  pruneopts = "UT"
   revision = "26e67e76b6c3f6ce91f7c52def5af501b4e0f3a2"
 
 [[projects]]
   branch = "master"
-  digest = "1:f645667d687fc8bf228865a2c5455824ef05bad08841e673673ef2bb89ac5b90"
   name = "golang.org/x/oauth2"
   packages = [
     ".",
     "google",
     "internal",
     "jws",
-    "jwt",
+    "jwt"
   ]
-  pruneopts = "UT"
   revision = "d2e6202438beef2727060aa7cabdd924d92ebfd9"
 
 [[projects]]
   branch = "master"
-  digest = "1:e0140c0c868c6e0f01c0380865194592c011fe521d6e12d78bfd33e756fe018a"
   name = "golang.org/x/sync"
   packages = ["semaphore"]
-  pruneopts = "UT"
   revision = "1d60e4601c6fd243af51cc01ddf169918a5407ca"
 
 [[projects]]
   branch = "master"
-  digest = "1:6eb2645d74b43d9c87b51947df39f7c668a4f422cd512053f7f6f75bfaad0197"
   name = "golang.org/x/sys"
   packages = ["unix"]
-  pruneopts = "UT"
+  revision = "1561086e645b2809fb9f8a1e2a38160bf8d53bf4"
-  revision = "d0be0721c37eeb5299f245a996a483160fc36940"
 
 [[projects]]
-  digest = "1:a2ab62866c75542dd18d2b069fec854577a20211d7c0ea6ae746072a1dccdd18"
   name = "golang.org/x/text"
   packages = [
     "collate",
@@ -169,15 +138,13 @@
     "unicode/bidi",
     "unicode/cldr",
     "unicode/norm",
-    "unicode/rangetable",
+    "unicode/rangetable"
   ]
-  pruneopts = "UT"
   revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
   version = "v0.3.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:e9e388241f9f0f02000dddaeeb91153d53f0cd09dcec33879cc7e043a2e65d75"
   name = "google.golang.org/api"
   packages = [
     "googleapi/transport",
@@ -187,13 +154,11 @@
     "support/bundler",
     "transport",
     "transport/grpc",
-    "transport/http",
+    "transport/http"
   ]
-  pruneopts = "UT"
+  revision = "19ff8768a5c0b8e46ea281065664787eefc24121"
-  revision = "7ca32eb868bf53ea2fc406698eb98583a8073d19"
 
 [[projects]]
-  digest = "1:26619fcd2452b4044174d26acd8b09c09dffee9a1c3a22d2383b873aa9a0131f"
   name = "google.golang.org/appengine"
   packages = [
     ".",
@@ -207,15 +172,13 @@
     "internal/socket",
     "internal/urlfetch",
     "socket",
-    "urlfetch",
+    "urlfetch"
   ]
-  pruneopts = "UT"
+  revision = "ae0ab99deb4dc413a2b4bd6c8bdd0eb67f1e4d06"
-  revision = "b1f26356af11148e710935ed1ac8a7f5702c7612"
+  version = "v1.2.0"
-  version = "v1.1.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:7a3da01a8f840fbbef1f027dc091ae52a29c6ab9374e126b6bdc5bf3b0ff2687"
   name = "google.golang.org/genproto"
   packages = [
     "googleapis/api/annotations",
@@ -228,13 +191,11 @@
     "googleapis/monitoring/v3",
     "googleapis/rpc/errdetails",
     "googleapis/rpc/status",
-    "protobuf/field_mask",
+    "protobuf/field_mask"
   ]
-  pruneopts = "UT"
+  revision = "c3f76f3b92d1ffa4c58a9ff842a58b8877655e0f"
-  revision = "36d5787dc5356b711fe8f3040271aaf51c35955b"
 
 [[projects]]
-  digest = "1:4ad047d772a7d4841687df9534a767a9e243885ed6d7d2ced6af5995a5dc44b3"
   name = "google.golang.org/grpc"
   packages = [
     ".",
@@ -248,6 +209,7 @@
     "encoding",
     "encoding/proto",
     "grpclog",
+    "health/grpc_health_v1",
     "internal",
     "internal/backoff",
     "internal/channelz",
@@ -263,29 +225,14 @@
     "resolver/passthrough",
     "stats",
     "status",
-    "tap",
+    "tap"
   ]
-  pruneopts = "UT"
+  revision = "32fb0ac620c32ba40a4626ddf94d90d12cce3455"
-  revision = "8dea3dc473e90c8179e519d91302d0597c0ca1d1"
+  version = "v1.14.0"
-  version = "v1.15.0"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  input-imports = [
+  inputs-digest = "b68fd9438c2eb711d9fc51c1f23c5ca0d5169bf4022351dfc400cd35ba39dfaa"
-    "cloud.google.com/go/profiler",
-    "contrib.go.opencensus.io/exporter/stackdriver",
-    "github.com/GoogleCloudPlatform/microservices-demo/src/productcatalogservice/genproto",
-    "github.com/golang/protobuf/jsonpb",
-    "github.com/golang/protobuf/proto",
-    "github.com/google/go-cmp/cmp",
-    "go.opencensus.io/plugin/ocgrpc",
-    "go.opencensus.io/stats/view",
-    "go.opencensus.io/trace",
-    "golang.org/x/net/context",
-    "google.golang.org/grpc",
-    "google.golang.org/grpc/codes",
-    "google.golang.org/grpc/status",
-  ]
   solver-name = "gps-cdcl"
   solver-version = 1

src/productcatalogservice/Gopkg.toml

@@ -33,10 +33,6 @@
   name = "contrib.go.opencensus.io/exporter/stackdriver"
   version = "0.5.0"
 
-[[constraint]]
-  branch = "master"
-  name = "github.com/GoogleCloudPlatform/microservices-demo"
-
 [[constraint]]
   name = "github.com/golang/protobuf"
   version = "1.2.0"
@@ -55,7 +51,7 @@
 
 [[constraint]]
   name = "google.golang.org/grpc"
-  version = "1.15.0"
+  version = "=1.14.0"
 
 [prune]
   go-tests = true

src/productcatalogservice/server.go

@@ -26,6 +26,7 @@ import (
 	"time"
 
 	pb "github.com/GoogleCloudPlatform/microservices-demo/src/productcatalogservice/genproto"
+	healthpb "google.golang.org/grpc/health/grpc_health_v1"
 
 	"cloud.google.com/go/profiler"
 	"contrib.go.opencensus.io/exporter/stackdriver"
@@ -69,7 +70,9 @@ func run(port int) string {
 		log.Fatal(err)
 	}
 	srv := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
-	pb.RegisterProductCatalogServiceServer(srv, &productCatalog{})
+	svc := &productCatalog{}
+	pb.RegisterProductCatalogServiceServer(srv, svc)
+	healthpb.RegisterHealthServer(srv, svc)
 	go srv.Serve(l)
 	return l.Addr().String()
 }
@@ -140,6 +143,10 @@ func parseCatalog() []*pb.Product {
 	return cat.Products
 }
 
+func (p *productCatalog) Check(ctx context.Context, req *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
+	return &healthpb.HealthCheckResponse{Status: healthpb.HealthCheckResponse_SERVING}, nil
+}
+
 func (p *productCatalog) ListProducts(context.Context, *pb.Empty) (*pb.ListProductsResponse, error) {
 	return &pb.ListProductsResponse{Products: parseCatalog()}, nil
 }

src/shippingservice/Dockerfile

@@ -14,6 +14,9 @@ RUN go install .
 
 FROM alpine as release
 RUN apk add --no-cache ca-certificates
+RUN GRPC_HEALTH_PROBE_VERSION=v0.1.0-alpha.1 && \
+    wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-amd64 && \
+    chmod +x /bin/grpc_health_probe
 COPY --from=builder /go/bin/shippingservice /shippingservice
 ENV APP_PORT=50051
 EXPOSE 50051

src/shippingservice/Gopkg.lock

@@ -2,40 +2,27 @@
 
 
 [[projects]]
-  digest = "1:467af0aad47996b25b838d6f14c8371123a8a76ec239020a6c5894e1f8f60272"
   name = "cloud.google.com/go"
   packages = [
     "compute/metadata",
     "internal/version",
     "monitoring/apiv3",
     "profiler",
-    "trace/apiv2",
+    "trace/apiv2"
   ]
-  pruneopts = "UT"
   revision = "c728a003b238b26cef9ab6753a5dc424b331c3ad"
   version = "v0.27.0"
 
 [[projects]]
-  digest = "1:9fe70def8f0ceb3d455a0acad9dadd6632287cdbf9c8c2ea50e8dabe2ade40c4"
   name = "contrib.go.opencensus.io/exporter/stackdriver"
   packages = [
     ".",
-    "propagation",
+    "propagation"
   ]
-  pruneopts = "UT"
   revision = "37aa2801fbf0205003e15636096ebf0373510288"
   version = "v0.5.0"
 
 [[projects]]
-  branch = "master"
-  digest = "1:57b417980654aa49be2ff6a1ee6498a412ab253930dd95f1e1f27a9bbf2e1081"
-  name = "github.com/GoogleCloudPlatform/microservices-demo"
-  packages = ["src/shippingservice/genproto"]
-  pruneopts = "UT"
-  revision = "6d969441585ade8c91c235115c7cdb12ac61354f"
-
-[[projects]]
-  digest = "1:72856926f8208767b837bf51e3373f49139f61889b67dc7fd3c2a0fd711e3f7a"
   name = "github.com/golang/protobuf"
   packages = [
     "proto",
@@ -46,30 +33,24 @@
     "ptypes/empty",
     "ptypes/struct",
     "ptypes/timestamp",
-    "ptypes/wrappers",
+    "ptypes/wrappers"
   ]
-  pruneopts = "UT"
   revision = "aa810b61a9c79d51363740d207bb46cf8e620ed5"
   version = "v1.2.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:089d56c0adb79140365b5c86815ce97233986da6f3a525c6b706773e4b83876f"
   name = "github.com/google/pprof"
   packages = ["profile"]
-  pruneopts = "UT"
+  revision = "e027b505a088ac3c68c339a1d7ce7724bf34538b"
-  revision = "84b7d314e22c8d12334e52726f68517973b6027b"
 
 [[projects]]
-  digest = "1:e145e9710a10bc114a6d3e2738aadf8de146adaa031854ffdf7bbfe15da85e63"
   name = "github.com/googleapis/gax-go"
   packages = ["."]
-  pruneopts = "UT"
   revision = "317e0006254c44a0ac427cc52a0e083ff0b9622f"
   version = "v2.0.0"
 
 [[projects]]
-  digest = "1:1bb914cfb78f68f488a91cd7872d3d06a5f83c5bbacf0296dbef44e120b00a91"
   name = "go.opencensus.io"
   packages = [
     ".",
@@ -85,15 +66,13 @@
     "trace",
     "trace/internal",
     "trace/propagation",
-    "trace/tracestate",
+    "trace/tracestate"
   ]
-  pruneopts = "UT"
   revision = "b11f239c032624b045c4c2bfd3d1287b4012ce89"
   version = "v0.16.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:1c14517b2f106c61d75006199b46a46576058661d469658cb0f90739919641d2"
   name = "golang.org/x/net"
   packages = [
     "context",
@@ -103,43 +82,35 @@
     "http2/hpack",
     "idna",
     "internal/timeseries",
-    "trace",
+    "trace"
   ]
-  pruneopts = "UT"
   revision = "26e67e76b6c3f6ce91f7c52def5af501b4e0f3a2"
 
 [[projects]]
   branch = "master"
-  digest = "1:f645667d687fc8bf228865a2c5455824ef05bad08841e673673ef2bb89ac5b90"
   name = "golang.org/x/oauth2"
   packages = [
     ".",
     "google",
     "internal",
     "jws",
-    "jwt",
+    "jwt"
   ]
-  pruneopts = "UT"
   revision = "d2e6202438beef2727060aa7cabdd924d92ebfd9"
 
 [[projects]]
   branch = "master"
-  digest = "1:e0140c0c868c6e0f01c0380865194592c011fe521d6e12d78bfd33e756fe018a"
   name = "golang.org/x/sync"
   packages = ["semaphore"]
-  pruneopts = "UT"
   revision = "1d60e4601c6fd243af51cc01ddf169918a5407ca"
 
 [[projects]]
   branch = "master"
-  digest = "1:6eb2645d74b43d9c87b51947df39f7c668a4f422cd512053f7f6f75bfaad0197"
   name = "golang.org/x/sys"
   packages = ["unix"]
-  pruneopts = "UT"
+  revision = "1561086e645b2809fb9f8a1e2a38160bf8d53bf4"
-  revision = "d0be0721c37eeb5299f245a996a483160fc36940"
 
 [[projects]]
-  digest = "1:a2ab62866c75542dd18d2b069fec854577a20211d7c0ea6ae746072a1dccdd18"
   name = "golang.org/x/text"
   packages = [
     "collate",
@@ -155,15 +126,13 @@
     "unicode/bidi",
     "unicode/cldr",
     "unicode/norm",
-    "unicode/rangetable",
+    "unicode/rangetable"
   ]
-  pruneopts = "UT"
   revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
   version = "v0.3.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:e9e388241f9f0f02000dddaeeb91153d53f0cd09dcec33879cc7e043a2e65d75"
   name = "google.golang.org/api"
   packages = [
     "googleapi/transport",
@@ -173,13 +142,11 @@
     "support/bundler",
     "transport",
     "transport/grpc",
-    "transport/http",
+    "transport/http"
   ]
-  pruneopts = "UT"
+  revision = "19ff8768a5c0b8e46ea281065664787eefc24121"
-  revision = "7ca32eb868bf53ea2fc406698eb98583a8073d19"
 
 [[projects]]
-  digest = "1:26619fcd2452b4044174d26acd8b09c09dffee9a1c3a22d2383b873aa9a0131f"
   name = "google.golang.org/appengine"
   packages = [
     ".",
@@ -193,15 +160,13 @@
     "internal/socket",
     "internal/urlfetch",
     "socket",
-    "urlfetch",
+    "urlfetch"
   ]
-  pruneopts = "UT"
+  revision = "ae0ab99deb4dc413a2b4bd6c8bdd0eb67f1e4d06"
-  revision = "b1f26356af11148e710935ed1ac8a7f5702c7612"
+  version = "v1.2.0"
-  version = "v1.1.0"
 
 [[projects]]
   branch = "master"
-  digest = "1:7a3da01a8f840fbbef1f027dc091ae52a29c6ab9374e126b6bdc5bf3b0ff2687"
   name = "google.golang.org/genproto"
   packages = [
     "googleapis/api/annotations",
@@ -214,13 +179,11 @@
     "googleapis/monitoring/v3",
     "googleapis/rpc/errdetails",
     "googleapis/rpc/status",
-    "protobuf/field_mask",
+    "protobuf/field_mask"
   ]
-  pruneopts = "UT"
+  revision = "c3f76f3b92d1ffa4c58a9ff842a58b8877655e0f"
-  revision = "36d5787dc5356b711fe8f3040271aaf51c35955b"
 
 [[projects]]
-  digest = "1:97c4b6de720998595a38558d26277cffc14290a7f60ae2cf6f077a300c50ed17"
   name = "google.golang.org/grpc"
   packages = [
     ".",
@@ -234,6 +197,7 @@
     "encoding",
     "encoding/proto",
     "grpclog",
+    "health/grpc_health_v1",
     "internal",
     "internal/backoff",
     "internal/channelz",
@@ -251,26 +215,14 @@
     "resolver/passthrough",
     "stats",
     "status",
-    "tap",
+    "tap"
   ]
-  pruneopts = "UT"
+  revision = "32fb0ac620c32ba40a4626ddf94d90d12cce3455"
-  revision = "8dea3dc473e90c8179e519d91302d0597c0ca1d1"
+  version = "v1.14.0"
-  version = "v1.15.0"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  input-imports = [
+  inputs-digest = "5dac84cd5efcc89491aa3cda06a774c1b370c8e0cbdb99668cbfd8ba27b3e32c"
-    "cloud.google.com/go/profiler",
-    "contrib.go.opencensus.io/exporter/stackdriver",
-    "github.com/GoogleCloudPlatform/microservices-demo/src/shippingservice/genproto",
-    "github.com/golang/protobuf/proto",
-    "go.opencensus.io/plugin/ocgrpc",
-    "go.opencensus.io/stats/view",
-    "go.opencensus.io/trace",
-    "golang.org/x/net/context",
-    "google.golang.org/grpc",
-    "google.golang.org/grpc/reflection",
-  ]
   solver-name = "gps-cdcl"
   solver-version = 1

src/shippingservice/Gopkg.toml

@@ -33,10 +33,6 @@
   name = "contrib.go.opencensus.io/exporter/stackdriver"
   version = "0.5.0"
 
-[[constraint]]
-  branch = "master"
-  name = "github.com/GoogleCloudPlatform/microservices-demo"
-
 [[constraint]]
   name = "github.com/golang/protobuf"
   version = "1.2.0"
@@ -51,7 +47,7 @@
 
 [[constraint]]
   name = "google.golang.org/grpc"
-  version = "1.15.0"
+  version = "=1.14.0"
 
 [prune]
   go-tests = true

src/shippingservice/main.go

@@ -31,6 +31,7 @@ import (
 	"google.golang.org/grpc/reflection"
 
 	pb "github.com/GoogleCloudPlatform/microservices-demo/src/shippingservice/genproto"
+	healthpb "google.golang.org/grpc/health/grpc_health_v1"
 )
 
 const (
@@ -51,13 +52,15 @@ func main() {
 	if err != nil {
 		log.Fatalf("failed to listen: %v", err)
 	}
-	s := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
+	srv := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
-	pb.RegisterShippingServiceServer(s, &server{})
+	svc := &server{}
+	pb.RegisterShippingServiceServer(srv, svc)
+	healthpb.RegisterHealthServer(srv, svc)
 	log.Printf("Shipping Service listening on port %s", port)
 
 	// Register reflection service on gRPC server.
-	reflection.Register(s)
+	reflection.Register(srv)
-	if err := s.Serve(lis); err != nil {
+	if err := srv.Serve(lis); err != nil {
 		log.Fatalf("failed to serve: %v", err)
 	}
 }
@@ -65,6 +68,11 @@ func main() {
 // server controls RPC service responses.
 type server struct{}
 
+// Check is for health checking.
+func (s *server) Check(ctx context.Context, req *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
+	return &healthpb.HealthCheckResponse{Status: healthpb.HealthCheckResponse_SERVING}, nil
+}
+
 // GetQuote produces a shipping quote (cost) in USD.
 func (s *server) GetQuote(ctx context.Context, in *pb.GetQuoteRequest) (*pb.GetQuoteResponse, error) {
 	log.Printf("[GetQuote] received request")