add support for connecting to postgres database

internal/module/test/db-postgres_test.go

@@ -0,0 +1,126 @@
+package module_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"github.com/jwetzell/showbridge-go/internal/module"
+)
+
+func TestDbPostgresFromRegistry(t *testing.T) {
+	registration, ok := module.GetModuleRegistration("db.postgres")
+	if !ok {
+		t.Fatalf("db.postgres module not registered")
+	}
+
+	moduleInstance, err := registration.New(config.ModuleConfig{
+		Id:   "test",
+		Type: "db.postgres",
+		Params: map[string]any{
+			"url": "postgres://localhost:5432",
+		},
+	})
+
+	if err != nil {
+		t.Fatalf("failed to create db.postgres module: %s", err)
+	}
+
+	if moduleInstance.Id() != "test" {
+		t.Fatalf("db.postgres module has wrong id: %s", moduleInstance.Id())
+	}
+
+	if moduleInstance.Type() != "db.postgres" {
+		t.Fatalf("db.postgres module has wrong type: %s", moduleInstance.Type())
+	}
+}
+
+func TestGoodDbPostgres(t *testing.T) {
+
+	testCases := []struct {
+		name   string
+		params map[string]any
+	}{}
+
+	for _, test := range testCases {
+		t.Run(test.name, func(t *testing.T) {
+
+			registration, ok := module.GetModuleRegistration("db.postgres")
+			if !ok {
+				t.Fatalf("db.postgres module not registered")
+			}
+
+			moduleInstance, err := registration.New(config.ModuleConfig{
+				Id:     "test",
+				Type:   "db.postgres",
+				Params: test.params,
+			})
+
+			if err != nil {
+				t.Fatalf("db.postgres failed to create module: %s", err)
+			}
+			// TODO(jwetzell) this is kind of hacky
+			go func() {
+				time.Sleep(1 * time.Second)
+				moduleInstance.Stop()
+			}()
+			err = moduleInstance.Start(t.Context(), nil)
+
+			if err != nil {
+				t.Fatalf("db.postgres failed to start: %s", err)
+			}
+		})
+	}
+}
+
+func TestBadDbPostgres(t *testing.T) {
+	tests := []struct {
+		name        string
+		params      map[string]any
+		errorString string
+	}{
+		{
+			name:        "no url param",
+			params:      map[string]any{},
+			errorString: "db.postgres url error: not found",
+		},
+		{
+			name:        "non-string url",
+			params:      map[string]any{"url": 123},
+			errorString: "db.postgres url error: not a string",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+
+			registration, ok := module.GetModuleRegistration("db.postgres")
+			if !ok {
+				t.Fatalf("db.postgres module not registered")
+			}
+
+			moduleInstance, err := registration.New(config.ModuleConfig{
+				Id:     "test",
+				Type:   "db.postgres",
+				Params: test.params,
+			})
+
+			if err != nil {
+				if test.errorString != err.Error() {
+					t.Fatalf("db.postgres got error '%s', expected '%s'", err.Error(), test.errorString)
+				}
+				return
+			}
+
+			err = moduleInstance.Start(t.Context(), nil)
+
+			if err == nil {
+				t.Fatalf("db.postgres expected to fail")
+			}
+
+			if err.Error() != test.errorString {
+				t.Fatalf("db.postgres got error '%s', expected '%s'", err.Error(), test.errorString)
+			}
+		})
+	}
+}