First pass implementation of an SQLite backing store for fetched opportunities

internal/config/README.md

@@ -34,6 +34,7 @@ is kept.
 |---|---|---|---|
 | `logging.level` | string | `warn` | One of `debug`, `info`, `warn`, `error` |
 | `logging.file` | string | | Log file for `fetch service` (unless `--foreground`); other commands log to the terminal |
+| `database.file` | string | | Path to the SQLite database file, used by the `migrate` commands |
 | `sources.<source>.enabled` | bool | `false` | For every source |
 | `sources.<source>.interval` | duration | `10m` | For every source; e.g. `30s`, `1h` |
 | `sources.find_a_tender.api_root` | string | `https://www.find-tender.service.gov.uk/api/1.0` | URL of the Find a Tender API |
@@ -49,6 +50,8 @@ Example `config.yaml`:
 logging:
     level: info
     file: ""
+database:
+    file: ./jobsearch.db
 sources:
     find_a_tender:
         enabled: true
@@ -126,6 +129,7 @@ Nothing in `section.go` needs changing.
 | File | Contents |
 |---|---|
 | `config.go` | `JobSearchConfig`, defaults, Viper loading, text output |
+| `conf_database.go` | `database` section |
 | `load.go` | `Init`, `.env` and config file loading |
 | `modify.go` | `StoreValue` and `PurgeValue` |
 | `section.go` | The `Section` interface and the struct tag reflection shared by every section |

internal/config/conf_database.go

@@ -0,0 +1,35 @@
+package config
+
+import "reflect"
+
+// JSCKDatabase is the database section's configuration key.
+const JSCKDatabase string = "database"
+
+// JobSearchConfigDatabase configures the SQLite database. File is the path to
+// the database file.
+type JobSearchConfigDatabase struct {
+	File string `cfg:"file"`
+}
+
+// ---------- Section methods (see Section) ----------
+
+// Keys returns the keys directly in the section.
+func (c *JobSearchConfigDatabase) Keys() []string { return keysOf(c) }
+
+func (c JobSearchConfigDatabase) Map() map[string]any { return mapOf(c) }
+
+func (c JobSearchConfigDatabase) Flatten() map[string]any {
+	return flattenOf(JSCKDatabase, c)
+}
+
+func (c JobSearchConfigDatabase) TypeOf(key string) (reflect.Kind, error) {
+	return typeOf(c, key)
+}
+
+func (c JobSearchConfigDatabase) ValueOf(key string) (any, error) {
+	return valueOf(c, key)
+}
+
+func (c *JobSearchConfigDatabase) SetValue(key string, value any) error {
+	return setValue(c, key, value)
+}

internal/config/config.go

@@ -22,8 +22,9 @@ const EtcConfigPath string = "/etc/job-search"
 // JobSearchConfig is the application's whole configuration, one field per
 // section. Each field's cfg tag must match the section's JSCK* constant.
 type JobSearchConfig struct {
-	Logging JobSearchConfigLogging `cfg:"logging"`
-	Sources JobSearchConfigSources `cfg:"sources"`
+	Logging  JobSearchConfigLogging  `cfg:"logging"`
+	Database JobSearchConfigDatabase `cfg:"database"`
+	Sources  JobSearchConfigSources  `cfg:"sources"`
 }
 
 // LoadDefaultConfig sets Viper's defaults from the configuration's default