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Feature Dependencies

This diagram shows the dependencies between features in the Bull Bitcoin Mobile application. It helps visualize the dependency graph and ensures there are no cyclic dependencies.

Diagram Type: This is a Package Dependency Diagram (also known as Module Dependency Graph or Component Dependency Diagram in UML).

Module Dependency Graph

graph TB
    %% Core infrastructure
    CORE[Core<br/>---<br/>Database, Secure Storage,<br/>API Clients, Tor HTTP Client, UI Kit,<br/>DI & Router setup,<br/>PIN encrypted storage,<br/>Domain Primitives/Value Objects]

    %% Feature modules
    SETTINGS[Settings]
    TOR[Tor]
    PIN_CODE[Pin Code]
    LABELS[Labels]
    SECRETS[Secrets]
    HW_WALLETS[Hardware Wallets]
    BTC_PRICE[Bitcoin Price]
    BTCPAY[BTCPay]
    NETWORK[Network]
    BIP85[BIP85]
    BIP85_REGISTRY[BIP85 Registry]
    DETERMINISTIC_WALLETS[Deterministic Wallets]
    KEYCHAIN_MANIFEST[Keychain Manifest]
    WALLET_BACKUP[Wallet Backup]
    KEYCHAIN_RECOVERY[Keychain Recovery]
    REMOTE_KEYCHAIN_RECOVERY[Remote Keychain Recovery]
    WALLET_METADATA_BACKUP[Wallet Metadata Backup]
    NOSTR_IDENTITY[Nostr Identity]
    BULLNYM[Bullnym]
    AUTOMATIC_FALLBACK[Automatic Fallback]
    LIGHTNING_ADDRESS[Lightning Address]
    PAYMENT_PAGE[Payment Page]
    POS[Point of Sale]
    INVOICES[Invoices]
    GET_PAID_SETTINGS[Get Paid Settings]
    GET_PAID[Get Paid]
    FEES[Fees]
    WALLETS[Wallets]
    EXCHANGE[Exchange]
    FIAT_SETTLEMENT[Fiat Settlement]
    APP_STARTUP[App Startup]
    ONBOARDING[Onboarding]
    UTXO_MGMT[UTXO Management]
    ADDRESS_MGMT[Address Management]
    RECIPIENTS[Recipients]
    FUNDING[Funding]
    BACKUPS[Backups]
    SWAPS[Swaps]
    PAYJOIN[Payjoin]
    WITHDRAWAL[Withdrawal]
    STATUS[Status]
    SEND[Send]
    RECEIVE[Receive]
    TRANSFER[Transfer]
    TX_HISTORY[Transaction History]
    BG_TASKS[Background Tasks]
    AUTOSWAPS[AutoSwaps]
    AUTOSWEEP[AutoSweep]
    DCA[DCA]
    SELL[Sell]
    PAY[Pay]
    BUY[Buy]
    COINS[Coins / UTXOs]
    ANNOUNCEMENTS[Announcements]
    CONSOLIDATION[Consolidation]
    WIZARD[Onboarding Wizard]

    %% Dependencies to Core (all features depend on Core, but showing it explicitly would clutter the diagram)
    %% Instead, we note this in the documentation below

    %% Feature-to-feature dependencies (extracted from draw.io diagram)
    ADDRESS_MGMT --> LABELS
    ANNOUNCEMENTS --> SETTINGS
    APP_STARTUP --> WALLETS
    AUTOSWAPS --> TRANSFER
    AUTOSWEEP --> FEES
    AUTOSWEEP --> LABELS
    AUTOSWEEP --> WALLETS
    BIP85 --> SECRETS
    BIP85 --> SETTINGS
    BIP85 --> BIP85_REGISTRY
    BACKUPS --> BIP85
    BACKUPS --> TOR
    BACKUPS --> WALLET_BACKUP
    BACKUPS --> WALLETS
    BTC_PRICE --> SETTINGS
    BTCPAY --> BIP85_REGISTRY
    BTCPAY --> DETERMINISTIC_WALLETS
    BTCPAY --> KEYCHAIN_MANIFEST
    BTCPAY --> WALLETS
    KEYCHAIN_RECOVERY --> BIP85_REGISTRY
    KEYCHAIN_RECOVERY --> DETERMINISTIC_WALLETS
    KEYCHAIN_RECOVERY --> KEYCHAIN_MANIFEST
    AUTOMATIC_FALLBACK --> BULLNYM
    AUTOMATIC_FALLBACK --> LABELS
    AUTOMATIC_FALLBACK --> NOSTR_IDENTITY
    AUTOMATIC_FALLBACK --> WALLETS
    REMOTE_KEYCHAIN_RECOVERY --> KEYCHAIN_MANIFEST
    REMOTE_KEYCHAIN_RECOVERY --> KEYCHAIN_RECOVERY
    REMOTE_KEYCHAIN_RECOVERY --> LIGHTNING_ADDRESS
    REMOTE_KEYCHAIN_RECOVERY --> WALLET_BACKUP
    FIAT_SETTLEMENT --> BULLNYM
    FIAT_SETTLEMENT --> NOSTR_IDENTITY
    FIAT_SETTLEMENT --> EXCHANGE
    FIAT_SETTLEMENT --> WALLETS
    FIAT_SETTLEMENT --> SETTINGS
    GET_PAID --> FIAT_SETTLEMENT
    LIGHTNING_ADDRESS --> FIAT_SETTLEMENT
    PAYMENT_PAGE --> FIAT_SETTLEMENT
    POS --> FIAT_SETTLEMENT
    INVOICES --> FIAT_SETTLEMENT
    NOSTR_IDENTITY --> BIP85_REGISTRY
    ONBOARDING --> REMOTE_KEYCHAIN_RECOVERY
    LIGHTNING_ADDRESS --> BIP85_REGISTRY
    LIGHTNING_ADDRESS --> BULLNYM
    LIGHTNING_ADDRESS --> DETERMINISTIC_WALLETS
    LIGHTNING_ADDRESS --> KEYCHAIN_MANIFEST
    LIGHTNING_ADDRESS --> NOSTR_IDENTITY
    PAYMENT_PAGE --> BULLNYM
    PAYMENT_PAGE --> LIGHTNING_ADDRESS
    PAYMENT_PAGE --> DETERMINISTIC_WALLETS
    PAYMENT_PAGE --> KEYCHAIN_MANIFEST
    PAYMENT_PAGE --> BIP85_REGISTRY
    PAYMENT_PAGE --> NOSTR_IDENTITY
    REMOTE_KEYCHAIN_RECOVERY --> PAYMENT_PAGE
    POS --> BULLNYM
    POS --> LIGHTNING_ADDRESS
    POS --> DETERMINISTIC_WALLETS
    POS --> KEYCHAIN_MANIFEST
    POS --> BIP85_REGISTRY
    POS --> NOSTR_IDENTITY
    INVOICES --> BULLNYM
    INVOICES --> NOSTR_IDENTITY
    INVOICES --> WALLETS
    INVOICES --> LABELS
    GET_PAID_SETTINGS --> KEYCHAIN_MANIFEST
    GET_PAID_SETTINGS --> CORE
    GET_PAID --> AUTOMATIC_FALLBACK
    GET_PAID --> BTCPAY
    GET_PAID --> BULLNYM
    GET_PAID --> GET_PAID_SETTINGS
    GET_PAID --> INVOICES
    GET_PAID --> LIGHTNING_ADDRESS
    GET_PAID --> NOSTR_IDENTITY
    GET_PAID --> PAYMENT_PAGE
    GET_PAID --> POS
    GET_PAID --> WALLETS
    REMOTE_KEYCHAIN_RECOVERY --> KEYCHAIN_MANIFEST
    REMOTE_KEYCHAIN_RECOVERY --> KEYCHAIN_RECOVERY
    REMOTE_KEYCHAIN_RECOVERY --> WALLET_METADATA_BACKUP
    REMOTE_KEYCHAIN_RECOVERY --> LIGHTNING_ADDRESS
    REMOTE_KEYCHAIN_RECOVERY --> PAYMENT_PAGE
    REMOTE_KEYCHAIN_RECOVERY --> POS
    BUY --> EXCHANGE
    BUY --> RECEIVE
    COINS --> UTXO_MGMT
    COINS --> LABELS
    COINS --> WALLETS
    DCA --> RECEIVE
    DETERMINISTIC_WALLETS --> BIP85
    KEYCHAIN_MANIFEST --> BIP85_REGISTRY
    WALLET_BACKUP --> BIP85_REGISTRY
    WALLET_BACKUP --> BULLNYM
    WALLET_BACKUP --> KEYCHAIN_MANIFEST
    WALLET_BACKUP --> NOSTR_IDENTITY
    WALLET_BACKUP --> WALLET_METADATA_BACKUP
    KEYCHAIN_MANIFEST --> BULLNYM
    KEYCHAIN_MANIFEST --> NOSTR_IDENTITY
    GET_PAID_SETTINGS --> KEYCHAIN_MANIFEST
    REMOTE_KEYCHAIN_RECOVERY --> KEYCHAIN_MANIFEST
    REMOTE_KEYCHAIN_RECOVERY --> KEYCHAIN_RECOVERY
    REMOTE_KEYCHAIN_RECOVERY --> LIGHTNING_ADDRESS
    ONBOARDING --> REMOTE_KEYCHAIN_RECOVERY
    WALLET_METADATA_BACKUP --> LABELS
    WALLET_METADATA_BACKUP --> WALLETS
    WIZARD --> WALLET_METADATA_BACKUP
    EXCHANGE --> SETTINGS
    FEES --> NETWORK
    FUNDING --> EXCHANGE
    HW_WALLETS --> CORE
    LABELS --> CORE
    PAY --> RECIPIENTS
    PAYJOIN --> UTXO_MGMT
    PAYJOIN --> LABELS
    PIN_CODE --> CORE
    RECEIVE --> PAYJOIN
    RECEIVE --> SETTINGS
    RECEIVE --> SWAPS
    RECEIVE --> TX_HISTORY
    RECIPIENTS --> EXCHANGE
    SECRETS --> CORE
    SELL --> EXCHANGE
    SEND --> CONSOLIDATION
    SEND --> FEES
    SEND --> NETWORK
    SEND --> PAYJOIN
    SEND --> SWAPS
    SEND --> TX_HISTORY
    SEND --> UTXO_MGMT
    SEND --> WALLETS
    SETTINGS --> BTCPAY
    SETTINGS --> CORE
    SETTINGS --> LIGHTNING_ADDRESS
    SWAPS --> UTXO_MGMT
    TOR --> CORE
    TRANSFER --> CONSOLIDATION
    TRANSFER --> SEND
    TRANSFER --> RECEIVE
    TX_HISTORY --> PAYJOIN
    TX_HISTORY --> WALLETS
    UTXO_MGMT --> LABELS
    UTXO_MGMT --> WALLETS
    WALLETS --> BIP85
    WALLETS --> CONSOLIDATION
    WALLETS --> AUTOSWEEP
    WALLETS --> HW_WALLETS
    WALLETS --> NETWORK
    WALLETS --> SECRETS
    WALLETS --> SETTINGS
    WITHDRAWAL --> RECIPIENTS

    %% Styling
    classDef coreStyle fill:#2d3748,stroke:#4a5568,stroke-width:3px,color:#fff
    classDef featureStyle fill:#1a202c,stroke:#2d3748,stroke-width:2px,color:#e2e8f0

    class CORE coreStyle
    class SETTINGS,TOR,PIN_CODE,LABELS,SECRETS,HW_WALLETS,BTC_PRICE,BTCPAY,NETWORK,BIP85,BIP85_REGISTRY,DETERMINISTIC_WALLETS,KEYCHAIN_MANIFEST,WALLET_BACKUP,KEYCHAIN_RECOVERY,WALLET_METADATA_BACKUP,NOSTR_IDENTITY,BULLNYM,AUTOMATIC_FALLBACK,LIGHTNING_ADDRESS,PAYMENT_PAGE,POS,INVOICES,GET_PAID_SETTINGS,GET_PAID,FEES,WALLETS,EXCHANGE,APP_STARTUP,ONBOARDING,REMOTE_KEYCHAIN_RECOVERY,UTXO_MGMT,ADDRESS_MGMT,RECIPIENTS,FUNDING,BACKUPS,SWAPS,PAYJOIN,WITHDRAWAL,STATUS,SEND,RECEIVE,TRANSFER,TX_HISTORY,BG_TASKS,AUTOSWAPS,AUTOSWEEP,DCA,SELL,PAY,BUY,COINS,WIZARD,ANNOUNCEMENTS,CONSOLIDATION featureStyle
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About Package Dependency Diagrams

What This Diagram Shows

  • Modules/Packages: Each box represents a self-contained feature/package
  • Dependencies: Arrows show "depends on" relationships (A → B means "A depends on B")
  • Direction: Dependencies flow from dependent to dependency (not data flow)

Standard Information in Package Diagrams

  1. Module Names: Clear identification of each package/feature
  2. Dependency Direction: Arrows indicating which module depends on which
  3. Optional Elements (can be added):
    • Dependency type labels (e.g., "uses facade", "imports types")
    • Stereotypes like <<core>>, <<feature>>, <<infrastructure>>
    • Access modifiers (public/internal APIs)
    • Dependency cardinality (required vs optional)

Dependency Rules

  1. No Cyclic Dependencies: Features must not create circular dependency chains
  2. Core Independence: Core must not depend on any feature
  3. Feature Isolation: Features should communicate through well-defined facades/interfaces
  4. Layered Dependencies: Dependencies flow one way — shell → features → packages across modules, and ui → presentation → domain → data within a feature. Under the melos migration each lib/core/<domain> becomes a packages/<domain> and these turn into compile-time boundaries. See ARCHITECTURE.md.

Core Dependencies

Important: All features implicitly depend on Core for foundational services. These dependencies are not shown in the diagram to reduce visual clutter.

What Core Provides

  1. Infrastructure Services:

    • Database (Drift/SQLite)
    • Secure Storage instance (Flutter Secure Storage)
    • API Clients (REST/GraphQL clients)
    • Factory for a HTTP client to connect to Tor
    • UI Kit (shared widgets, theme)
    • DI setup and interfaces (Service Locator pattern)
    • Router setup and interfaces (Navigation)
    • PIN encrypted storage

  2. Core Primitives:

    • Intended location: /lib/core/primitives/ — the primitives layer is still being extracted (see AGENTS.md); not all of these types live there yet.
    • Examples: Secret, SecretUsagePurpose, Fingerprint, Address, Amount, etc.
    • Shared types used across multiple features, avoiding redundant definitions
    • Immutable, validated value objects that ensure domain integrity

Migration note: lib/core is shared infrastructure (no business logic). Shared domain modules that historically landed in lib/core/<domain> (e.g. wallet, secrets) graduate into packages/<domain> under the melos workspace — each exposing its repository interfaces + domain types + shared use-cases through a public API, never a bloc or screen. See ARCHITECTURE.md.

Key Dependency Patterns

Node Semantics

  • Wallets covers the shared wallet domain (lib/core/wallet, graduating to packages/wallet under the melos migration) together with the wallet home feature (lib/features/wallet). An edge into WALLETS means a feature consumes wallet domain APIs; edges out of WALLETS come from either half of that fused node.
  • The WALLETS <-> AUTOSWEEP pair is therefore not a real cycle: the wallet home feature (presentation) consumes the AutoSweep facade, while AutoSweep's data adapter consumes the core wallet domain. The melos split into separate nodes will make this two acyclic edges.

Central Features (Highly Depended Upon)

  • Core: Foundation for all features
  • Wallets: Used by Send, UTXO Management, Transaction History, Backups, App Startup, BTCPay, AutoSweep
  • Secrets: Used by Wallets, BIP85
  • Settings: Used by Wallets, Exchange, BIP85, Bitcoin Price
  • Recipients: Used by Pay, Withdrawal
  • UTXO Management: Used by Send, Swaps, Payjoin

Leaf Features (Depend on Many, Few Depend on Them)

  • Send: Depends on Fees, Network, Payjoin, Swaps, UTXO Management, Wallets
  • Receive: Depends on Payjoin, Swaps
  • AutoSwaps: Depends on Transfer
  • Backups: Depends on BIP85, Tor, Wallets

Exchange-Related Features

  • Buy, Sell, Funding: All depend on Exchange
  • Recipients: Depends on Exchange

Verification

To verify no cyclic dependencies exist, you can:

  1. Manual trace: Follow any path through the graph - it should never return to a previously visited node
  2. Automated tools: Use dart pub deps or custom dependency analysis scripts
  3. Import analysis: Review import statements in facade/public API files

Future Improvements

  • Add dependency type labels (e.g., "uses facade", "imports primitives")
  • Document which specific APIs each feature exposes
  • Add dependency cardinality (required vs optional dependencies)
  • Include compile-time vs runtime dependency distinction
  • Add layer groupings (ui, presentation, domain, data) per ARCHITECTURE.md