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wiki/OpsBridgeFrs.md
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wiki/OpsBridgeFrs.md
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OpsBridgeFrs
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*Functional requirements specification for OpsBridge*
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# OpsBridge Functional Requirements Specification
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*Operations Access Bridges for Humans and Automation Agents*
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Version: **0.1**
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Status: Draft
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Date: **2026-03-11**
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---
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# 1. Definition
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The **OpsBridge Functional Requirements Specification (FRS)** defines the externally observable behaviors and capabilities that the OpsBridge system must provide in order to support controlled operational access bridges between infrastructure components.
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OpsBridge enables human operators and automation agents to establish, inspect, and manage temporary infrastructure access paths, typically realized through secure connectivity mechanisms such as reverse SSH tunnels.
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This specification describes **system behavior from the perspective of users, external systems, and observable outputs**, without prescribing implementation methods or internal system design.
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The FRS provides the functional contract that guides system design, development, verification, and operational validation.
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---
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# 2. Context
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OpsBridge operates within infrastructure environments where controlled access between systems must be established dynamically for operational purposes such as diagnostics, maintenance, and remediation.
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These environments may involve interactions between:
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* human operators
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* automation agents
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* remote execution environments
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* infrastructure control services
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* identity management systems
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The FRS translates the product intent defined in the OpsBridge PRD into **precise functional expectations** that describe how the system must behave when interacting with users, external services, and infrastructure components.
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Within the system documentation hierarchy:
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* **PRD** defines the product intent and scope
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* **FRS** defines externally observable system behavior
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* **design specifications** describe the internal architecture that realizes those behaviors
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---
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# 3. Core Concepts
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## Bridge
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A **Bridge** represents a controlled operational access path between two infrastructure contexts.
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The bridge enables connectivity between:
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* a remote host environment
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* a local service or endpoint
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Bridges are created, monitored, and terminated through OpsBridge system functions.
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---
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## Actor
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An **Actor** represents an entity initiating a bridge operation.
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Actors may include:
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* human operators
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* automation agents
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* automated maintenance systems
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Actor identity is used for operations attribution and auditability.
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---
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## Target
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A **Target** represents an infrastructure component that can be accessed via a bridge.
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Targets may include:
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* hosts
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* services
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* containers
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* Kubernetes workloads
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* operations control interfaces
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Targets provide a structured orientation model for infrastructure access.
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---
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## Bridge State
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A **Bridge State** represents the externally observable operational status of a bridge.
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Examples include:
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* stopped
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* starting
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* connected
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* degraded
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* failed
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Bridge state information must be visible to users and external systems.
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---
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## Bridge Lifecycle Event
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A **Bridge Lifecycle Event** represents a state transition or operational occurrence related to a bridge.
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Examples include:
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* bridge creation
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* bridge connection established
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* bridge disconnection
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* health check failure
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Lifecycle events must be observable through system outputs such as logs or status queries.
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---
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# 4. Scope and Non-Scope
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## In Scope
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This specification defines functional requirements for:
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* creation and termination of bridges
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* inspection of bridge state and lifecycle
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* actor attribution for bridge operations
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* health monitoring of bridged services
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* visibility of reachable infrastructure targets
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* interaction with external identity systems
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* generation of operational audit information
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The FRS focuses on **externally observable system behavior**.
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---
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## Out of Scope
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The following aspects are intentionally excluded from this specification:
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* technical implementation details
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* internal system architecture
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* specific algorithms or process models
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* command-line interface layout or formatting
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* performance or scalability characteristics unless functionally expressed
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* security mechanisms beyond observable behavior
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These aspects are defined in design and architecture specifications.
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---
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# 5. Functional Requirements
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The following sections define the functional behavior required from the OpsBridge system.
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Requirement statements are written in a declarative form suitable for verification.
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---
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## 5.1 Bridge Creation
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### FR-1 — Bridge Initiation
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The system shall allow an actor to initiate the creation of a bridge using a defined bridge identifier.
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### FR-2 — Bridge Configuration Retrieval
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Upon initiation of a bridge, the system shall retrieve the configuration associated with the specified bridge identifier.
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### FR-3 — Bridge Establishment
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The system shall establish an operational access bridge according to the retrieved configuration.
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### FR-4 — Bridge State Notification
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Upon successful establishment of a bridge, the system shall report the bridge state as **connected**.
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---
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## 5.2 Bridge Termination
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### FR-5 — Bridge Termination Request
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The system shall allow an actor to terminate an active bridge.
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### FR-6 — Bridge Shutdown
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Upon termination request, the system shall stop the active bridge.
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### FR-7 — State Update After Termination
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After termination, the system shall update the bridge state to **stopped**.
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---
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## 5.3 Bridge Restart
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### FR-8 — Bridge Restart Request
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The system shall allow an actor to request the restart of a bridge.
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### FR-9 — Restart Execution
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Upon receiving a restart request, the system shall terminate the active bridge and initiate a new bridge using the existing configuration.
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---
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## 5.4 Bridge Status Inspection
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### FR-10 — Bridge Status Query
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The system shall allow actors to query the operational status of bridges.
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### FR-11 — Status Reporting
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For each bridge, the system shall report:
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* bridge identifier
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* current bridge state
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* associated actor
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* remote host
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* uptime or connection duration if available
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---
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## 5.5 Bridge Lifecycle Monitoring
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### FR-12 — Disconnection Detection
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The system shall detect when an established bridge becomes disconnected.
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### FR-13 — Automatic Reconnection
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If a bridge disconnects unexpectedly, the system shall attempt to re-establish the bridge according to the bridge configuration.
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### FR-14 — State Reporting During Reconnection
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During reconnection attempts, the system shall report the bridge state as **reconnecting** or equivalent.
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---
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## 5.6 Health Monitoring
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### FR-15 — Health Check Execution
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The system shall support optional health checks associated with a bridge.
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### FR-16 — Health Status Reporting
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The system shall report the result of health checks associated with a bridge.
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### FR-17 — Degraded State
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If a health check indicates failure while the bridge remains connected, the system shall report the bridge state as **degraded**.
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---
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## 5.7 Actor Attribution
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### FR-18 — Actor Identification
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The system shall associate each bridge with a defined actor.
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### FR-19 — Actor Visibility
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The system shall include actor identification information in bridge status reports.
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### FR-20 — Actor Attribution in Events
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The system shall include actor identity information in operations event records.
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---
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## 5.8 Infrastructure Target Discovery
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### FR-21 — Target Catalog Query
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The system shall allow actors to retrieve a list of defined infrastructure targets.
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### FR-22 — Target Reachability Inspection
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The system shall allow actors to inspect which bridges provide access to a given target.
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### FR-23 — Infrastructure Orientation
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The system shall provide a representation of infrastructure targets and their reachable access paths.
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---
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## 5.9 Audit Logging
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### FR-24 — Lifecycle Event Logging
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The system shall record lifecycle events related to bridges.
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### FR-25 — Actor Attribution in Logs
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Audit records shall include actor identity information associated with bridge operations.
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### FR-26 — Operations Event Visibility
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Operations events shall be retrievable by actors for inspection.
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---
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## 5.10 Identity Integration
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### FR-27 — Identity Provider Interaction
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The system shall support interaction with external identity systems to obtain credentials required for bridge establishment.
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### FR-28 — Credential Use
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The system shall use credentials obtained from external identity systems when establishing bridges.
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### FR-29 — Identity Attribution
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The system shall associate the identity of actors provided by external identity systems with bridge lifecycle events.
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External identity systems may include:
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* privacyIDEA
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---
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# 6. Functional Constraints
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The following constraints influence system behavior.
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### FC-1 — Configuration Dependency
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Bridge operations depend on the existence of valid bridge configuration entries.
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### FC-2 — External Connectivity
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Bridge establishment requires network connectivity to the remote host defined in the configuration.
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### FC-3 — Credential Availability
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Bridge establishment requires valid credentials available through the configured identity integration mechanism.
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---
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# 7. Traceability
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Each functional requirement defined in this document traces back to the product intent defined in the OpsBridge PRD.
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Primary traceability relationships include:
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| PRD Concept | FRS Requirement Group |
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| -------------------------- | --------------------- |
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| Operations Access Bridges | FR-1 to FR-14 |
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| Actor Attribution | FR-18 to FR-20 |
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| Infrastructure Orientation | FR-21 to FR-23 |
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| Operations Observability | FR-10 to FR-17 |
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| Identity Integration | FR-27 to FR-29 |
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This traceability enables downstream artifacts such as:
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* design specifications
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* system tests
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* acceptance criteria
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* validation procedures
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to map back to the originating product requirements.
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---
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# 8. Related Concepts
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The OpsBridge Functional Requirements Specification relates to several adjacent artifacts.
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* **Product Requirements Document (PRD)** – Defines product intent and scope.
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* **Non-Functional Requirements (NFR)** – Define performance, reliability, and security expectations.
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* **System Design Specification (SDS)** – Describes the architecture used to implement the defined functions.
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* **Use Case Specifications** – Provide scenario-level interaction descriptions for system behavior.
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Together these artifacts form a layered documentation structure supporting the full system lifecycle.
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xxx
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