proton-bridge/doc/bridge.md

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# Bridge
## Main blocks
This is basic overview of the main bridge blocks.
Note connection between IMAP/SMTP and PMAPI. IMAP and SMTP packages are in the queue to be refactored
and we would like to try to have functionality in bridge core or bridge utilities (such as messages)
than direct usage of PMAPI from IMAP or SMTP. Also database (BoltDB) should be moved to bridge core.
```mermaid
graph LR
S[Server]
C[Client]
U[User]
subgraph "Bridge app"
Core[Bridge core]
API[PMAPI]
Store
DB[BoltDB]
Frontend["Qt / CLI"]
IMAP
SMTP
IMAP --> Store
IMAP --> Core
SMTP --> Core
SMTP --> API
Core --> API
Core --> Store
Store --> API
Store --> DB
Frontend --> Core
end
C --> IMAP
C --> SMTP
U --> Frontend
API --> S
```
## Code structure
More detailed graph of main types used in Bridge app and connection between them. Here is already
communication to PMAPI only from bridge core which is not true, yet. IMAP and SMTP are still calling
PMAPI directly.
```mermaid
graph TD
C["Client (e.g. Thunderbird)"]
PM[Proton Mail Server]
subgraph "Bridge app"
subgraph "Bridge core"
B[Bridge]
U[User]
B --> U
end
subgraph Store
StoreU[Store User]
StoreA[Address]
StoreM[Mailbox]
StoreU --> StoreA
StoreA --> StoreM
end
subgraph Credentials
CredStore[Store]
Creds[Credentials]
CredStore --> Creds
end
subgraph Frontend
CLI
Qt
end
subgraph IMAP
IB[IMAP backend]
IA[IMAP address]
IM[IMAP mailbox]
IB --> B
IB --> IA
IA --> IM
IA --> U
IA --> StoreA
IM --> StoreM
end
subgraph SMTP
SB[SMTP backend]
SS[SMTP session]
SB --> B
SB --> SS
SS --> U
end
end
subgraph PMAPI
AC[Client]
end
C --> IB
C --> SB
CLI --> B
Qt --> B
U --> CredStore
U --> Creds
U --> StoreU
StoreU --> AC
StoreA --> AC
StoreM --> AC
B --> AC
U --> AC
AC --> PM
```
## How to debug
Run `make run-debug` which starts [Delve](https://github.com/go-delve/delve).