chore: Bump to GoLang v1.18 (#721)

- Resolves #720 

- Description
  > Bumps Go versions of GitHub Action environment setups.
  > Bumps Docker image Go version.
  > Bumps and resolves Linter issues.
  > Bumps and Updates `go.mod`.

- Limitation
>  A sub-linter was disabled because it lacked support with `v1.18` of Go. Can be easily turned back on if they bump up their support (golangci/golangci-lint#2649).
>  Despite us bumping to 1.18, we internally ban the use of generics until our benchmarks are fixed.

.github/workflows/code-test-coverage.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.17'
+          go-version: "1.18"
           check-latest: true
 
       - name: Generate full test coverage report using go-acc

.github/workflows/detect-change.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Setup Go environment explicitly
         uses: actions/setup-go@v3
         with:
-          go-version: "1.17"
+          go-version: "1.18"
           check-latest: true
 
       - name: Build dependencies

.github/workflows/lint-then-benchmark.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Setup Go environment explicitly
         uses: actions/setup-go@v3
         with:
-          go-version: "1.17"
+          go-version: "1.18"
           check-latest: true
 
       - name: Run the golangci-lint

.github/workflows/run-tests.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Go environment explicitly
         uses: actions/setup-go@v3
         with:
-          go-version: "1.17"
+          go-version: "1.18"
           check-latest: true
 
       - name: Build dependencies

.github/workflows/start-binary.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Setup Go environment explicitly
         uses: actions/setup-go@v3
         with:
-          go-version: "1.17"
+          go-version: "1.18"
           check-latest: true
 
       - name: Build modules

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 # Build stage
-FROM docker.io/golang:1.17 AS BUILD
+FROM docker.io/golang:1.18 AS BUILD
 
 WORKDIR /app
 

db/fetcher/fetcher.go

@@ -48,7 +48,6 @@ type DocumentFetcher struct {
 	txn          datastore.Txn
 	spans        core.Spans
 	order        []dsq.Order
-	uniqueSpans  map[core.Span]struct{} //nolint:structcheck,unused
 	curSpanIndex int
 
 	schemaFields map[uint32]client.FieldDescription

go.mod

@@ -1,6 +1,6 @@
 module github.com/sourcenetwork/defradb
 
-go 1.17
+go 1.18
 
 require (
 	github.com/bxcodec/faker v2.0.1+incompatible

tools/configs/golangci.yaml

@@ -122,12 +122,15 @@ linters:
     - nolintlint
     - revive
     - staticcheck
-    - structcheck
     - typecheck
     - unused
     - varcheck
     - whitespace
 
+  # https://github.com/golangci/golangci-lint/issues/2649
+  # Linters below are disabled for now because of go1.18 issue above^
+  # - structcheck
+
 #====================================================[ Tweaks To Fix Issues or Exclude linter(s) on Select Locations ]
 issues:
   # List of regexps of issue texts to exclude, empty list by default.
@@ -262,7 +265,7 @@ linters-settings:
 
   gosimple:
     # Select the Go version to target.
-    go: "1.17"
+    go: "1.18"
     # https://staticcheck.io/docs/options#checks
     checks: ["all", "-S1038"]
     # Turn on all except (these are disabled):
@@ -328,14 +331,14 @@ linters-settings:
 
   staticcheck:
     # Select the Go version to target.
-    go: "1.17"
+    go: "1.18"
     # https://staticcheck.io/docs/options#checks
     checks: ["all"]
 
 
   unused:
     # Select the Go version to target.
-    go: "1.17"
+    go: "1.18"
 
 
   whitespace: