DIS-Reader

DIS Reader

A bridge service that lets your applications read DIS (AS/400) data easily—embedded JDBC or remote agent, same API.
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About The Project

DIS Reader is a Go service that exposes DIS (AS/400) data to other applications with a stable, API-first contract. It runs in two modes:

• Embedded mode (default): ships the JDBC runner inside the binary and serves queries directly to the DIS host you configure.
• Remote agent mode: a lightweight LAN agent runs the JDBC bridge next to your DIS server and proxies requests to the cloud over gRPC—no inbound ports required.

Capabilities:

• Typed services for units, invoices, and parts with filter/sort/paging helpers.
• Health-checked lifecycle around the JDBC runner (start, connect, ping, shutdown).
• Debug Search batch runner that emits SQLite or CSV datasets for downstream tooling.
• Simple config surface via disreader.yaml or DISREADER_* environment variables.

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Built With

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Getting Started

Choose embedded when you can reach DIS directly; choose remote when DIS lives behind firewalls and only outbound traffic is allowed.

Prerequisites

• Go 1.24+
• Java 11+ on PATH (for embedded JDBC runner or agent)
• protoc, protoc-gen-go, protoc-gen-go-grpc (only if you regenerate bridge stubs)
• (Remote mode) TLS egress to the bridge server

Installation

1. Clone the repo

   git clone https://github.com/BeardedWonderDev/DIS-Reader.git
   cd DIS-Reader
   

2. (Optional) Regenerate gRPC stubs

   protoc --go_out=. --go-grpc_out=. proto/bridge.proto
   

3. Build binaries

   go build ./cmd/...        # core service binaries
   go build ./cmd/agent/...  # remote agent daemon
   

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Usage

Embedded mode (default)

Start the service using your DIS host credentials:

DISREADER_DISCONFIG_HOST=10.0.0.5 DISREADER_DISCONFIG_USER=XXXXX DISREADER_DISCONFIG_PASSWORD=XXXXX go run ./...

• Config file: disreader.yaml
• Key settings: disConfig.host|user|password, JDBC javaPath/jdbcPort, connection pool sizes.
• Consumers call the exported Go services (or any gRPC/HTTP gateway you layer on) to fetch units, invoices, and parts.

Remote mode (agent bridge)

1. Run the LAN agent near DIS (one per tenant, or more for HA):

   ./cmd/agent/agent --config agent.yaml
   

2. Client construction (Go):

remote, err := disreader.NewDISReaderRemote(cfg, logger).
    WithDefaultTenant("tenant-1"). // optional; omit for pure per-call tenancy
    Build()
rows, _ := remote.UnitService("tenant-1").ListUnits(ctx, lp)

Multi-tenant: set one agent per tenant; call tenant-aware methods (Connect(ctx, tenant), UnitService(tenant)). Do not rely on a default tenant from config; supply it via WithDefaultTenant or per call.

Remote client (full example):

ctx := context.Background()

remote, err := disreader.NewDISReaderRemote(cfg, logger).
    WithDefaultTenant("tenant-a").
    Build()
if err != nil { log.Fatal(err) }

if err := remote.PingBridge(ctx); err != nil { log.Fatal(err) }
if err := remote.PingAgent(ctx, "tenant-a"); err != nil { log.Fatal(err) }
if err := remote.Connect(ctx, "tenant-a"); err != nil { log.Fatal(err) }

unitSvc := remote.UnitService("tenant-a")
units, err := unitSvc.ListUnits(ctx, types.ListParams{Limit: 10})
if err != nil { log.Fatal(err) }
fmt.Println("units", len(units))

// Start/stop the remote JDBC runner on the agent (mirrors embedded lifecycle)
if err := remote.StartJDBCRunner(ctx, "tenant-a"); err != nil { log.Fatal(err) }
defer remote.StopJDBCRunner(ctx, "tenant-a")

// Read the agent's current config (sanitized: secrets are write-only)
cfgStatus, err := remote.ReadAgentConfig(ctx, "tenant-a")
if err != nil { log.Fatal(err) }
fmt.Println("agent host:", cfgStatus.GetRuntime().GetDisHost(), "has password?", cfgStatus.GetRuntime().GetHasPassword())

Defaults and ports:

• The remote builder auto-starts gRPC (/AgentService) on :8443 and HTTP (/healthz,/metrics, pprof if enabled) on :8080. Override with env DISREADER_BRIDGE_PORT and DISREADER_BRIDGE_HTTP_PORT, or supply your own servers via WithGRPC/WithMux. Bridge config keys:
• bridge.mode: embedded|remote (default embedded)
• bridge.serverURL, bridge.clientID, bridge.clientSecret
• TLS: bridge.tls.insecure, bridge.tls.caFile

Debug Search Output Modes

Produce ad-hoc datasets for analysis:

• Default SQLite: debug-search.db
• CSV: set debugSearch.defaultOutputMode: csv or DISREADER_DEBUGSEARCH_DEFAULTOUTPUTMODE=csv
• Path override: debugSearch.defaultOutputPath / DISREADER_DEBUGSEARCH_DEFAULTOUTPUTPATH

Control plane (TUI + GUI)

You can manage the remote agent without CLI flags by using the bundled control surfaces. Both talk to the local control API exposed by the agent.

1. Enable the control API in agent.yaml (or env):

   control:
     enabled: true
     addr: "127.0.0.1:7777"
     token: "set-a-strong-token"
   

   Start/restart the agent so it listens on the control API.
2. TUI (agentctl):
   • Download the agentctl binary from the release matching your OS/arch.
   • Run ./agentctl --addr http://127.0.0.1:7777 --token <token>.
   • Use the form to set serverURL, clientID/Secret, DIS host creds, JDBC port/java path, TLS flags, then “Save & Apply”.
   • Use the buttons to Install, Start, Stop, Restart, and view status.
3. GUI (dis-agent-gui):
   • Download the GUI binary for your platform and run it (macOS app, Windows exe, or Linux binary with GTK/WebKit deps).
   • Point it at the control API address/token.
   • Fill out config fields and “Save + Install + Start” for first-run; “Save + Restart” for updates.
   • The dashboard shows bridge status, last heartbeat, and raw status. Auto-refresh can be enabled in the UI.

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Roadmap

TODO: replace with the post–remote-agent roadmap once the current phase completes.

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Contributing

Please run go test ./... and go vet ./... before opening a PR. Add regression tests for service changes and include sample configs for new bridge/agent settings.

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License

Distributed under the project_license. See LICENSE.txt for more information.

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Contact

DIS Reader Team - maintainer@example.com

Project Link: https://github.com/BeardedWonderDev/DIS-Reader

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Acknowledgments

• IBM i / AS/400 community resources
• gRPC & Protocol Buffers maintainers
• SQLite project
• JT400 / JDBC bridge contributors

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