Break FatfsStreamFactory's dep on ServiceLocator

src/tangara/audio/audio_fsm.cpp

@@ -237,11 +237,11 @@ void AudioState::react(const system_fsm::BluetoothEvent& ev) {
         break;
     }
   }
-  if (std::holds_alternative<drivers::bluetooth::RemoteVolumeChanged>(ev.event)) {
-    auto volume_chg = std::get<drivers::bluetooth::RemoteVolumeChanged>(ev.event).new_vol;
-        events::Ui().Dispatch(RemoteVolumeChanged{
-          .value = volume_chg
-        });
+  if (std::holds_alternative<drivers::bluetooth::RemoteVolumeChanged>(
+          ev.event)) {
+    auto volume_chg =
+        std::get<drivers::bluetooth::RemoteVolumeChanged>(ev.event).new_vol;
+    events::Ui().Dispatch(RemoteVolumeChanged{.value = volume_chg});
   }
 }
 
@@ -356,7 +356,8 @@ void Uninitialised::react(const system_fsm::BootComplete& ev) {
 
   sDrainBuffer = std::make_unique<drivers::PcmBuffer>(kDrainLatencySamples);
 
-  sStreamFactory.reset(new FatfsStreamFactory(*sServices));
+  sStreamFactory.reset(
+      new FatfsStreamFactory(sServices->database(), sServices->tag_parser()));
   sI2SOutput.reset(new I2SAudioOutput(sServices->gpios(), *sDrainBuffer));
   sBtOutput.reset(new BluetoothAudioOutput(
       sServices->bluetooth(), *sDrainBuffer, sServices->bg_worker()));

src/tangara/audio/fatfs_stream_factory.cpp

@@ -10,7 +10,6 @@
 #include <memory>
 #include <string>
 
-#include "database/database.hpp"
 #include "esp_log.h"
 #include "ff.h"
 #include "freertos/portmacro.h"
@@ -19,10 +18,10 @@
 #include "audio/audio_source.hpp"
 #include "audio/fatfs_source.hpp"
 #include "codec.hpp"
+#include "database/database.hpp"
 #include "database/tag_parser.hpp"
 #include "database/track.hpp"
 #include "drivers/spi.hpp"
-#include "system_fsm/service_locator.hpp"
 #include "tasks.hpp"
 #include "types.hpp"
 
@@ -30,12 +29,13 @@
 
 namespace audio {
 
-FatfsStreamFactory::FatfsStreamFactory(system_fsm::ServiceLocator& services)
-    : services_(services) {}
+FatfsStreamFactory::FatfsStreamFactory(database::Handle&& handle,
+                                       database::ITagParser& parser)
+    : db_(handle), tag_parser_(parser) {}
 
 auto FatfsStreamFactory::create(database::TrackId id, uint32_t offset)
     -> std::shared_ptr<TaggedStream> {
-  auto db = services_.database().lock();
+  auto db = db_.lock();
   if (!db) {
     return {};
   }
@@ -48,7 +48,7 @@ auto FatfsStreamFactory::create(database::TrackId id, uint32_t offset)
 
 auto FatfsStreamFactory::create(std::string path, uint32_t offset)
     -> std::shared_ptr<TaggedStream> {
-  auto tags = services_.tag_parser().ReadAndParseTags(path);
+  auto tags = tag_parser_.ReadAndParseTags(path);
   if (!tags) {
     ESP_LOGE(kTag, "failed to read tags");
     return {};

src/tangara/audio/fatfs_stream_factory.hpp

@@ -6,23 +6,21 @@
 
 #pragma once
 
-#include <stdint.h>
 #include <cstddef>
 #include <cstdint>
 #include <future>
 #include <memory>
 #include <string>
 
-#include "database/database.hpp"
-#include "database/track.hpp"
 #include "ff.h"
 #include "freertos/portmacro.h"
 
 #include "audio/audio_source.hpp"
 #include "codec.hpp"
+#include "database/database.hpp"
 #include "database/future_fetcher.hpp"
 #include "database/tag_parser.hpp"
-#include "system_fsm/service_locator.hpp"
+#include "database/track.hpp"
 #include "tasks.hpp"
 #include "types.hpp"
 
@@ -33,7 +31,7 @@ namespace audio {
  */
 class FatfsStreamFactory {
  public:
-  explicit FatfsStreamFactory(system_fsm::ServiceLocator&);
+  explicit FatfsStreamFactory(database::Handle&&, database::ITagParser&);
 
   auto create(database::TrackId, uint32_t offset = 0)
       -> std::shared_ptr<TaggedStream>;
@@ -47,7 +45,8 @@ class FatfsStreamFactory {
   auto ContainerToStreamType(database::Container)
       -> std::optional<codecs::StreamType>;
 
-  system_fsm::ServiceLocator& services_;
+  database::Handle db_;
+  database::ITagParser& tag_parser_;
 };
 
 }  // namespace audio

src/tangara/database/database.cpp

@@ -684,6 +684,12 @@ auto Database::countRecords(const SearchKey& c) -> size_t {
   return count;
 }
 
+Handle::Handle(std::shared_ptr<Database>& db) : db_(db) {}
+
+auto Handle::lock() -> std::shared_ptr<Database> {
+  return db_;
+}
+
 auto SearchKey::startKey() const -> std::string_view {
   if (key) {
     return *key;

src/tangara/database/database.hpp

@@ -128,6 +128,16 @@ class Database {
   auto countRecords(const SearchKey& c) -> size_t;
 };
 
+class Handle {
+ public:
+  Handle(std::shared_ptr<Database>& db);
+
+  auto lock() -> std::shared_ptr<Database>;
+
+ private:
+  std::shared_ptr<Database>& db_;
+};
+
 /*
  * Container for the data needed to iterate through database records. This is a
  * lower-level type that the higher-level iterators are built from; most users

src/tangara/system_fsm/service_locator.hpp

@@ -92,7 +92,7 @@ class ServiceLocator {
 
   auto haptics(std::unique_ptr<drivers::Haptics> i) { haptics_ = std::move(i); }
 
-  auto database() -> std::weak_ptr<database::Database> { return database_; }
+  auto database() -> database::Handle { return database_; }
 
   auto database(std::unique_ptr<database::Database> i) {
     database_ = std::move(i);