Add SQLite support for easy setup (#336)

* Modifies schema to allow SQLite as a DB driver. SQLite is preinstalled in most OSes allowing for minimal prerequisites in the installation process.

* Removes Redis dependency and replaces "real" redis instance with ioredis-mock this is not feature complete and errors are expected.

* Updates medusa new command to only ask for Postgres credentials if the starter template has database_type === "postgres" in medusa-config.js

* Small improvements to bin resolution

* Improvements to endpoint stability

packages/medusa/src/utils/db-aware-column.ts

@@ -0,0 +1,58 @@
+import path from "path"
+import { Column, ColumnOptions, ColumnType } from "typeorm"
+import { getConfigFile } from "medusa-core-utils"
+
+const pgSqliteTypeMapping: { [key: string]: ColumnType } = {
+  increment: "rowid",
+  timestamptz: "datetime",
+  jsonb: "simple-json",
+  enum: "text",
+}
+
+const pgSqliteGenerationMapping: {
+  [key: string]: "increment" | "uuid" | "rowid"
+} = {
+  increment: "rowid",
+}
+
+let dbType: string
+export function resolveDbType(pgSqlType: ColumnType): ColumnType {
+  if (!dbType) {
+    const { configModule } = getConfigFile(path.resolve("."), `medusa-config`)
+    dbType = configModule.projectConfig.database_type
+  }
+
+  if (dbType === "sqlite" && pgSqlType in pgSqliteTypeMapping) {
+    return pgSqliteTypeMapping[pgSqlType.toString()]
+  }
+  return pgSqlType
+}
+
+export function resolveDbGenerationStrategy(
+  pgSqlType: "increment" | "uuid" | "rowid"
+): "increment" | "uuid" | "rowid" {
+  if (!dbType) {
+    const { configModule } = getConfigFile(path.resolve("."), `medusa-config`)
+    dbType = configModule.projectConfig.database_type
+  }
+
+  if (dbType === "sqlite" && pgSqlType in pgSqliteTypeMapping) {
+    return pgSqliteGenerationMapping[pgSqlType]
+  }
+  return pgSqlType
+}
+
+export function DbAwareColumn(columnOptions: ColumnOptions) {
+  const pre = columnOptions.type
+  if (columnOptions.type) {
+    columnOptions.type = resolveDbType(columnOptions.type)
+  }
+
+  if (pre === "jsonb" && pre !== columnOptions.type) {
+    if ("default" in columnOptions) {
+      columnOptions.default = JSON.stringify(columnOptions.default)
+    }
+  }
+
+  return Column(columnOptions)
+}

packages/medusa/src/utils/manual-auto-increment.ts

@@ -0,0 +1,24 @@
+import path from "path"
+import { getConnection } from "typeorm"
+import { getConfigFile } from "medusa-core-utils"
+
+export async function manualAutoIncrement(
+  tableName: string
+): Promise<number | null> {
+  const { configModule } = getConfigFile(path.resolve("."), `medusa-config`)
+  const dbType = configModule.projectConfig.database_type
+  if (dbType === "sqlite") {
+    const connection = getConnection()
+    const [rec] = await connection.query(
+      `SELECT MAX(rowid) as mr FROM "${tableName}"`
+    )
+
+    let mr = 0
+    if (rec && rec.mr) {
+      mr = rec.mr
+    }
+    return mr + 1
+  }
+
+  return null
+}