feat: update dockerfile base and deps (#63)

Author: jpfe-tid

Dockerfile

@@ -1,19 +1,21 @@
-FROM golang:1.14.4-alpine3.12 as build
+FROM golang:1.16.1-buster as build
 
-# Get prebuilt libkafka.
-RUN apk add --no-cache alpine-sdk 'librdkafka>=1.3.0' 'librdkafka-dev>=1.3.0'
+RUN apt update && apt install build-essential -y
 
 WORKDIR /src/prometheus-kafka-adapter
-ADD . /src/prometheus-kafka-adapter
 
-RUN go test
-RUN go build -o /prometheus-kafka-adapter
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+ADD . /src/prometheus-kafka-adapter
 
-FROM alpine:3.12
+RUN go build -o /prometheus-kafka-adapter -ldflags '-w -extldflags "-static"'
+RUN go test ./...
 
-RUN apk add --no-cache 'librdkafka>=1.3.0'
+FROM alpine:3.13
 
-COPY --from=build /src/prometheus-kafka-adapter/schemas/metric.avsc /schemas/metric.avsc
+COPY schemas/metric.avsc /schemas/metric.avsc
 COPY --from=build /prometheus-kafka-adapter /
 
 CMD /prometheus-kafka-adapter

README.md

@@ -82,7 +82,7 @@ Building requires librdkafka be available on the building host. It is typically
 
 ```
 go test
-go build -tags static
+go build
 ```
 
 ## contributing

go.mod

@@ -4,7 +4,7 @@ require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/confluentinc/confluent-kafka-go v1.3.0
+	github.com/confluentinc/confluent-kafka-go v1.6.1
 	github.com/gin-gonic/contrib v0.0.0-20191209060500-d6e26eeaa607
 	github.com/gin-gonic/gin v1.6.3
 	github.com/gogo/protobuf v1.3.1

go.sum

@@ -6,8 +6,8 @@ github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk5
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/confluentinc/confluent-kafka-go v1.3.0 h1:1gJm/SgUqG01jRYJ1pSZ9GldAhXZ0xrFPKxINlVZ3z0=
-github.com/confluentinc/confluent-kafka-go v1.3.0/go.mod h1:MPUvNqmycSJrQZKGPS6LyLZLJH1hmLKkBmHQgQR7Ma0=
+github.com/confluentinc/confluent-kafka-go v1.6.1 h1:YxM/UtMQ2vgJX2gIgeJFUD0ANQYTEvfo4Cs4qKUlmGE=
+github.com/confluentinc/confluent-kafka-go v1.6.1/go.mod h1:u2zNLny2xq+5rWeTQjFHbDzzNuba4P1vo31r9r4uAdg=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=