go: use dep in builds, remove relative imports

Fixes #11.
Fixes #12.
Fixes #13.

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

src/frontend/Dockerfile

@@ -1,32 +1,17 @@
 FROM golang:1.10-alpine as builder
-RUN apk add --no-cache ca-certificates git
-WORKDIR /go/src/frontend
+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
 
-# fetch known dependencies for caching
-RUN go get -d github.com/google/uuid \
-    github.com/gorilla/mux \
-    github.com/pkg/errors \
-    github.com/sirupsen/logrus \
-    google.golang.org/grpc \
-    google.golang.org/grpc/codes \
-    google.golang.org/grpc/status \
-    go.opencensus.io/plugin/ochttp \
-    go.opencensus.io/plugin/ochttp/propagation/b3 \
-    go.opencensus.io/exporter/stackdriver \
-    go.opencensus.io/trace \
-    cloud.google.com/go/profiler
+ENV PROJECT github.com/GoogleCloudPlatform/microservices-demo/src/frontend
+WORKDIR /go/src/$PROJECT
 
-# copy go-only part of the build
-COPY *.go ./
-COPY ./genproto ./genproto
-COPY ./money    ./money
-
-# fetch other dependencies might not have listed above (ideally noop)
-RUN go get -d ./...
+# restore dependencies
+COPY Gopkg.* ./
+RUN dep ensure --vendor-only -v
+COPY . .
 RUN go install .
 
-# ---
-
 FROM alpine as release
 RUN apk add --no-cache ca-certificates \
     busybox-extras net-tools bind-tools

src/frontend/Gopkg.lock

@@ -13,6 +13,15 @@
   revision = "aad3f485ee528456e0768f20397b4d9dd941e755"
   version = "v0.25.0"
 
+[[projects]]
+  name = "contrib.go.opencensus.io/exporter/stackdriver"
+  packages = [
+    ".",
+    "propagation"
+  ]
+  revision = "37aa2801fbf0205003e15636096ebf0373510288"
+  version = "v0.5.0"
+
 [[projects]]
   name = "github.com/golang/protobuf"
   packages = [
@@ -75,8 +84,6 @@
   name = "go.opencensus.io"
   packages = [
     ".",
-    "exporter/stackdriver",
-    "exporter/stackdriver/propagation",
     "internal",
     "internal/tagencoding",
     "plugin/ocgrpc",
@@ -97,7 +104,7 @@
   branch = "master"
   name = "golang.org/x/crypto"
   packages = ["ssh/terminal"]
-  revision = "c126467f60eb25f8f27e5a981f32a87e3965053f"
+  revision = "56440b844dfe139a8ac053f4ecac0b20b79058f4"
 
 [[projects]]
   branch = "master"
@@ -112,7 +119,7 @@
     "internal/timeseries",
     "trace"
   ]
-  revision = "a0f8a16cb08c06df97cbdf9c47f4731ba548c33c"
+  revision = "f4c29de78a2a91c00474a2e689954305c350adf9"
 
 [[projects]]
   branch = "master"
@@ -139,7 +146,7 @@
     "unix",
     "windows"
   ]
-  revision = "bd9dbc187b6e1dacfdd2722a87e83093c2d7bd6e"
+  revision = "0ffbfd41fbef8ffcf9b62b0b0aa3a5873ed7a4fe"
 
 [[projects]]
   name = "golang.org/x/text"
@@ -175,7 +182,7 @@
     "transport/grpc",
     "transport/http"
   ]
-  revision = "31ca0e01cd791f07750cb23fc99327721f753290"
+  revision = "f6d94689cbd71030af1108ddac733886fcae1d75"
 
 [[projects]]
   name = "google.golang.org/appengine"
@@ -212,7 +219,7 @@
     "googleapis/rpc/status",
     "protobuf/field_mask"
   ]
-  revision = "2a72893556e4d1f6c795a4c039314c9fa751eedb"
+  revision = "daca94659cb50e9f37c1b834680f2e46358f10b0"
 
 [[projects]]
   name = "google.golang.org/grpc"
@@ -231,7 +238,9 @@
     "internal",
     "internal/backoff",
     "internal/channelz",
+    "internal/envconfig",
     "internal/grpcrand",
+    "internal/transport",
     "keepalive",
     "metadata",
     "naming",
@@ -241,15 +250,14 @@
     "resolver/passthrough",
     "stats",
     "status",
-    "tap",
-    "transport"
+    "tap"
   ]
-  revision = "168a6198bcb0ef175f7dacec0b8691fc141dc9b8"
-  version = "v1.13.0"
+  revision = "32fb0ac620c32ba40a4626ddf94d90d12cce3455"
+  version = "v1.14.0"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "a3d5d54ffc54113ecaf3060ac9855f71371867737615dfa7654c34676a546271"
+  inputs-digest = "806889b149b944cab2216a1769d221df9ca18b3b62fb5040e40737fd0550084c"
   solver-name = "gps-cdcl"
   solver-version = 1

src/frontend/Gopkg.toml

@@ -29,6 +29,10 @@
   name = "cloud.google.com/go"
   version = "0.25.0"
 
+[[constraint]]
+  name = "contrib.go.opencensus.io/exporter/stackdriver"
+  version = "0.5.0"
+
 [[constraint]]
   name = "github.com/golang/protobuf"
   version = "1.1.0"
@@ -59,7 +63,7 @@
 
 [[constraint]]
   name = "google.golang.org/grpc"
-  version = "1.13.0"
+  version = "1.14.0"
 
 [prune]
   go-tests = true

src/frontend/README.md

@@ -0,0 +1,5 @@
+# frontend
+
+Run the following command to restore dependencies to `vendor/` directory:
+
+    dep ensure --vendor-only

src/frontend/handlers.go

@@ -16,7 +16,6 @@ package main
 
 import (
 	"fmt"
-	"frontend/money"
 	"html/template"
 	"net/http"
 	"os"
@@ -27,7 +26,8 @@ import (
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 
-	pb "frontend/genproto"
+	pb "github.com/GoogleCloudPlatform/microservices-demo/src/frontend/genproto"
+	"github.com/GoogleCloudPlatform/microservices-demo/src/frontend/money"
 )
 
 var (

src/frontend/main.go

@@ -22,10 +22,10 @@ import (
 	"time"
 
 	"cloud.google.com/go/profiler"
+	"contrib.go.opencensus.io/exporter/stackdriver"
 	"github.com/gorilla/mux"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
-	"go.opencensus.io/exporter/stackdriver"
 	"go.opencensus.io/plugin/ocgrpc"
 	"go.opencensus.io/plugin/ochttp"
 	"go.opencensus.io/plugin/ochttp/propagation/b3"

src/frontend/money/money.go

@@ -16,7 +16,8 @@ package money
 
 import (
 	"errors"
-	pb "frontend/genproto"
+
+	pb "github.com/GoogleCloudPlatform/microservices-demo/src/frontend/genproto"
 )
 
 const (

src/frontend/money/money_test.go

@@ -19,7 +19,7 @@ import (
 	"reflect"
 	"testing"
 
-	pb "frontend/genproto"
+	pb "github.com/GoogleCloudPlatform/microservices-demo/src/frontend/genproto"
 )
 
 func mmc(u int64, n int32, c string) pb.Money { return pb.Money{Units: u, Nanos: n, CurrencyCode: c} }

src/frontend/rpc.go

@@ -17,7 +17,7 @@ package main
 import (
 	"context"
 
-	pb "frontend/genproto"
+	pb "github.com/GoogleCloudPlatform/microservices-demo/src/frontend/genproto"
 
 	"github.com/pkg/errors"
 )