Implements /transactions POST method

It adds the method to the OpenAPI spec and generates a new server
config. The requirement for the ID on the Transaction component is
removed, so that it can be reused for insertions.
It also adds two new middlewares, a logging and a spec validator. If a
request does not follow the spec, a 400 is returned immediately.

Issue: #18

internal/api/api.cfg.yaml

@@ -0,0 +1,6 @@
+package: api
+generate:
+  echo-server: true
+  models: true
+  embedded-spec: true
+output: server.gen.go

internal/api/impl.go

@@ -8,7 +8,7 @@ import (
 	"github.com/labstack/echo/v4"
 )
 
-//go:generate oapi-codegen --config=api.cfg.yaml ../../docs/openapi.yaml
+//go:generate go run github.com/deepmap/oapi-codegen/v2/cmd/oapi-codegen@v2.1.0 --config=api.cfg.yaml ../../docs/openapi.yaml
 
 type ServerImpl struct {
 	Dal dal.DAL

internal/dal/dal.go

@@ -10,4 +10,4 @@ type DAL interface {
 	Banks() (entity.Banks, error)
 }
 
-//go:generate mockgen -destination=../mock/mock_dal.gen.go -package=mock . DAL
+//go:generate go run go.uber.org/mock/mockgen@latest -destination=../mock/mock_dal.gen.go -package=mock . DAL

internal/dal/impl.go

@@ -54,7 +54,7 @@ func (dal *DalImpl) InsertTransaction(t entity.Transaction) (entity.Transaction,
 	}
 
 	stmt := `
-	INSERT INTO pfbudget.transactions (date, description, value)
+	INSERT INTO pfbudget.transactions (date, description, amount)
 	VALUES ($1, $2, $3)
 	RETURNING id
 	`

internal/dal/impl_test.go

@@ -297,7 +297,7 @@ func TestDalImpl_InsertTransaction(t *testing.T) {
 
 			mock.
 				ExpectQuery(`
-					INSERT INTO .* \(date, description, value\)
+					INSERT INTO .* \(date, description, amount\)
 					VALUES \(\$1, \$2, \$3\)
 					RETURNING id`).
 				WithArgs(tt.args.t.Date, tt.args.t.Description, tt.args.t.Value).

tools.go

@@ -1,7 +1,7 @@
 //go:build tools
 // +build tools
 
-package main
+package tools
 
 import (
 	_ "github.com/deepmap/oapi-codegen/v2/cmd/oapi-codegen"