PMM-5723 Reviewdog checks. (#187)

* PMM-5723 Reviewdog checks.

* PMM-5723 Reviewdog required checks.

.golangci-required.yml

@@ -0,0 +1,25 @@
+---
+# The most valuable linters; they are required to pass for PR to be merged.
+
+linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      # use "github.com/pkg/errors" instead
+      - errors
+
+  goimports:
+    local-prefixes: github.com/percona/mongodb_exporter
+
+linters:
+  disable-all: true
+  enable:
+    - depguard
+    - goimports
+    - ineffassign
+    - govet
+    - staticcheck
+
+issues:
+  exclude-use-default: false

.travis.yml

@@ -38,6 +38,16 @@ env:
     - MONGODB_IMAGE=percona/percona-server-mongodb:3.6
     - MONGODB_IMAGE=percona/percona-server-mongodb:4.0
 
+install:
+  # install reviewdog and golangci-lin
+  - curl https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh| sh -s
+  - curl https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s latest
+
+before_script:
+  # static analyze
+  - bin/golangci-lint run -c=.golangci-required.yml --out-format=line-number | bin/reviewdog -f=golangci-lint -level=error -reporter=github-pr-check
+  - bin/golangci-lint run -c=.golangci.yml --out-format=line-number | bin/reviewdog -f=golangci-lint -level=error -reporter=github-pr-review
+
 script: make test-all
 
 jobs: