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master-zapier-plan-draft/packages/overview/08-diagrams.md
George Lambert 1b199ca4d4
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Separate Zapier, web, API, and leaf access planes with NATS authz 
Zapier is one ingress. Direct web, customer API, and S2S leaf nodes are their own services. Every hop to an internal subject must pass verae.access.authz.check (default deny by plane).
2026-09-11 16:05:05 -04:00

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8. Architectural diagrams

SVG files in diagrams/. The same shapes are repeated below in mermaid for Forgejo preview.

8.1 End-to-end (HTTPS vs NATS)

System

flowchart LR
  Z[Zapier cloud] -->|HTTPS plane=zapier| AZ[access-zapier]
  Web[customer browser] -->|HTTPS plane=web| AW[access-web]
  API[customer API] -->|HTTPS plane=api| AA[access-api]
  Leaf[S2S leaf] -->|verae.access.leaf.in| AL[access-leaf]
  AZ --> Authz[access-authz]
  AW --> Authz
  AA --> Authz
  AL --> Authz
  CS[staff CS/sales] --> Authz
  Authz -->|allow| N[NATS cluster]
  BAL[account-balance] --> N
  AZ -->|HTTPS| M[verae-middleware]
  M --> N
  N --> P[job-poller]
  N --> R[WORM]
  N --> T[tree-node]
  P --> C[Verae chain]
  M --> C

8.2 NATS.IO 3-server cluster

Cluster

flowchart TB
  subgraph cluster [Verae NATS.IO JetStream]
    N1[nats-server A :4222 loopback]
    N2[nats-server B]
    N3[nats-server C]
    N1 <--> N2
    N2 <--> N3
    N3 <--> N1
  end
  MW[middleware + workers] -->|cluster URL list| cluster
  F[fleet SSH hosts] -->|workers only| cluster

8.3 Uptime and failure

Uptime

flowchart TD
  H[health /health] -->|fail| R[restart instance]
  P[pause] -->|not available| F[keepFloor spawn]
  S[SSH host down] -->|spawn failed| O[place on next machine]
  Q[archive.query broadcast] -->|bloom miss| SIL[silence]
  Q -->|hit| REP[archive.reply.id]

8.4 New address = new process

Routing

See 09-expansion-template.md.