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update documentation about 0.db admin db + symmetric encryption + include RPC examples + asymmetric transpart named key instances for encryption and signatures

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Maxime Van Hees
2025-09-19 11:55:28 +02:00
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README.md
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@@ -17,6 +17,8 @@ The main purpose of HeroDB is to offer a lightweight, embeddable, and Redis-comp
- **Expiration**: Time-to-live (TTL) functionality for keys.
- **Scanning**: Cursor-based iteration for keys and hash fields (`SCAN`, `HSCAN`).
- **AGE Cryptography Commands**: HeroDB-specific extensions for cryptographic operations.
- **Symmetric Encryption**: Stateless symmetric encryption using XChaCha20-Poly1305.
- **Admin Database 0**: Centralized control for database management, access control, and per-database encryption.
## Quick Start
@@ -30,31 +32,14 @@ cargo build --release
### Running HeroDB
You can start HeroDB with different backends and encryption options:
#### Default `redb` Backend
Launch HeroDB with the required `--admin-secret` flag, which encrypts the admin database (DB 0) and authorizes admin access. Optional flags include `--dir` for the database directory, `--port` for the TCP port (default 6379), `--sled` for the sled backend, and `--enable-rpc` to start the JSON-RPC management server on port 8080.
Example:
```bash
./target/release/herodb --dir /tmp/herodb_redb --port 6379
./target/release/herodb --dir /tmp/herodb --admin-secret myadminsecret --port 6379 --enable-rpc
```
#### `sled` Backend
```bash
./target/release/herodb --dir /tmp/herodb_sled --port 6379 --sled
```
#### `redb` with Encryption
```bash
./target/release/herodb --dir /tmp/herodb_encrypted --port 6379 --encrypt --encryption_key mysecretkey
```
#### `sled` with Encryption
```bash
./target/release/herodb --dir /tmp/herodb_sled_encrypted --port 6379 --sled --encrypt --encryption_key mysecretkey
```
For detailed launch options, see [Basics](docs/basics.md).
## Usage with Redis Clients
@@ -76,10 +61,24 @@ redis-cli -p 6379 SCAN 0 MATCH user:* COUNT 10
# 2) 1) "user:1"
```
## Cryptography
HeroDB supports asymmetric encryption/signatures via AGE commands (X25519 for encryption, Ed25519 for signatures) in stateless or key-managed modes, and symmetric encryption via SYM commands. Keys are persisted in the admin database (DB 0) for managed modes.
For details, see [AGE Cryptography](docs/age.md) and [Basics](docs/basics.md).
## Database Management
Databases are managed via JSON-RPC API, with metadata stored in the encrypted admin database (DB 0). Databases are public by default upon creation; use RPC to set them private, requiring access keys for SELECT operations (read or readwrite based on permissions). This includes per-database encryption keys, access control, and lifecycle management.
For examples, see [JSON-RPC Examples](docs/rpc_examples.md) and [Admin DB 0 Model](docs/admin.md).
## Documentation
For more detailed information on commands, features, and advanced usage, please refer to the documentation:
- [Basics](docs/basics.md)
- [Supported Commands](docs/cmds.md)
- [AGE Cryptography](docs/age.md)
- [AGE Cryptography](docs/age.md)
- [Admin DB 0 Model (access control, per-db encryption)](docs/admin.md)
- [JSON-RPC Examples (management API)](docs/rpc_examples.md)

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# Admin Database 0 (`0.db`)
This page explains what the Admin Database `DB 0` is, why HeroDB uses it, and how to work with it as a developer and end-user. It’s a practical guide covering how databases are created, listed, secured with access keys, and encrypted using per-database secrets.
## What is `DB 0`?
`DB 0` is the control-plane for a HeroDB instance. It stores metadata for all user databases (`db_id >= 1`) so the server can:
- Know which databases exist (without scanning the filesystem)
- Enforce access control (public/private with access keys)
- Enforce per-database encryption (whether a given database must be opened encrypted and with which write-only key)
`DB 0` itself is always encrypted with the admin secret (the process-level secret provided at startup).
## How `DB 0` is created and secured
- `DB 0` lives at `<base_dir>/0.db`
- It is always encrypted using the `admin secret` provided at process startup (using the `--admin-secret <secret>` CLI flag)
- Only clients that provide the correct admin secret can `SELECT 0` (see “`SELECT` + `KEY`” below)
At startup, the server bootstraps `DB 0` (initializes counters and structures) if it’s missing.
## Metadata stored in `DB 0`
Keys in `DB 0` (internal layout, but useful to understand how things work):
- `admin:next_id`
- String counter holding the next id to allocate (initialized to `"1"`)
- `admin:dbs`
- A hash acting as a set of existing database ids
- field = id (as string), value = `"1"`
- `meta:db:<id>`
- A hash holding db-level metadata
- field `public` = `"true"` or `"false"` (defaults to `true` if missing)
- `meta:db:<id>:keys`
- A hash mapping access-key hashes to the string `Permission:created_at_seconds`
- Examples: `Read:1713456789` or `ReadWrite:1713456789`
- The plaintext access keys are never stored; only their `SHA-256` hashes are kept
- `meta:db:<id>:enc`
- A string holding the per-database encryption key used to open `<id>.db` encrypted
- This value is write-only from the perspective of the management APIs (it’s set at creation and never returned)
- `age:key:<name>`
- Base64-encoded X25519 recipient (public encryption key) for named AGE keys
- `age:privkey:<name>`
- Base64-encoded X25519 identity (secret encryption key) for named AGE keys
- `age:signpub:<name>`
- Base64-encoded Ed25519 verify public key for named AGE keys
- `age:signpriv:<name>`
- Base64-encoded Ed25519 signing secret key for named AGE keys
> You don’t need to manipulate these keys directly; they’re listed to clarify the model. AGE keys are managed via AGE commands.
## Database lifecycle
1) Create a database (via JSON-RPC)
- The server allocates an id from `admin:next_id`, registers it in `admin:dbs`, and defaults the database to `public=true`
- If you pass an optional `encryption_key` during creation, the server persists it in `meta:db:<id>:enc`. That database will be opened in encrypted mode from then on
2) Open and use a database
- Clients select a database over RESP using `SELECT`
- Authorization and encryption state are enforced using `DB 0` metadata
3) Delete database files
- Removing `<id>.db` removes the physical storage
- `DB 0` remains the source of truth for existence and may be updated by future management methods as the system evolves
## Access control model
- Public database (default)
- Anyone can `SELECT <id>` with no key, and will get `ReadWrite` permission
- Private database
- You must provide an access key when selecting the database
- The server hashes the provided key with `SHA-256` and checks membership in `meta:db:<id>:keys`
- Permissions are `Read` or `ReadWrite` depending on how the key was added
- Admin `DB 0`
- Requires the exact admin secret as the `KEY` argument to `SELECT 0`
- Permission is `ReadWrite` when the secret matches
### How to select databases with optional `KEY`
- Public DB (no key required)
- `SELECT <id>`
- Private DB (access key required)
- `SELECT <id> KEY <plaintext_key>`
- Admin `DB 0` (admin secret required)
- `SELECT 0 KEY <admin_secret>`
Examples (using `redis-cli`):
```bash
# Public database
redis-cli -p $PORT SELECT 1
# → OK
# Private database
redis-cli -p $PORT SELECT 2 KEY my-db2-access-key
# → OK
# Admin DB 0
redis-cli -p $PORT SELECT 0 KEY my-admin-secret
# → OK
```
## Per-database encryption
- At database creation, you can provide an optional per-db encryption key
- If provided, the server persists that key in `DB 0` as `meta:db:<id>:enc`
- When you later open the database, the engine checks whether `meta:db:<id>:enc` exists to decide if it must open `<id>.db` in encrypted mode
- The per-db key is not returned by RPC—it is considered write-only configuration data
Operationally:
- Create with encryption: pass a non-null `encryption_key` to the `createDatabase` RPC
- Open later: simply `SELECT` the database; encryption is transparent to clients
## Management via JSON-RPC
You can manage databases using the management RPC (namespaced `herodb.*`). Typical operations:
- `createDatabase(backend, config, encryption_key?)`
- Allocates a new id, sets optional encryption key
- `listDatabases()`
- Lists database ids and info (including whether storage is currently encrypted)
- `getDatabaseInfo(db_id)`
- Returns details: backend, encrypted flag, size on disk, `key_count`, timestamps, etc.
- `addAccessKey(db_id, key, permissions)`
- Adds a `Read` or `ReadWrite` access key (permissions = `"read"` | `"readwrite"`)
- `listAccessKeys(db_id)`
- Returns hashes and permissions; you can use these hashes to delete keys
- `deleteAccessKey(db_id, key_hash)`
- Removes a key by its hash
- `setDatabasePublic(db_id, public)`
- Toggles public/private
Copyable JSON examples are provided in the [RPC examples documentation](./rpc_examples.md).
## Typical flows
1) Public, unencrypted database
- Create a new database without an encryption key
- Clients can immediately `SELECT <id>` without a key
- You can later make it private and add keys if needed
2) Private, encrypted database
- Create passing an `encryption_key`
- Mark it private (`setDatabasePublic false`) and add access keys
- Clients must use `SELECT <id> KEY <plaintext_access_key>`
- Storage opens in encrypted mode automatically
## Security notes
- Only `SHA-256` hashes of access keys are stored in `DB 0`; keep plaintext keys safe on the client side
- The per-db encryption key is never exposed via the API after it is set
- The admin secret must be kept secure; anyone with it can `SELECT 0` and perform administrative actions
## Troubleshooting
- `ERR invalid access key` when selecting a private db
- Ensure you passed the `KEY` argument: `SELECT <id> KEY <plaintext_key>`
- If you recently added the key, confirm the permissions and that you used the exact plaintext (hash must match)
- `Database X not found`
- The id isn’t registered in `DB 0` (`admin:dbs`). Use the management APIs to create or list databases
- Cannot `SELECT 0`
- The `KEY` must be the exact admin secret passed at server startup
## Reference
- Admin metadata lives in `DB 0` (`0.db`) and controls:
- Existence: `admin:dbs`
- Access: `meta:db:<id>.public` and `meta:db:<id>:keys`
- Encryption: `meta:db:<id>:enc`
For command examples and management payloads:
- RESP command basics: `docs/basics.md`
- Supported commands: `docs/cmds.md`
- JSON-RPC examples: `docs/rpc_examples.md`

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# HeroDB AGE usage: Stateless vs Key‑Managed
# HeroDB AGE Cryptography
This document explains how to use the AGE cryptography commands exposed by HeroDB over the Redis protocol in two modes:
- Stateless (ephemeral keys; nothing stored on the server)
- Key‑managed (server‑persisted, named keys)
HeroDB provides AGE-based asymmetric encryption and digital signatures over the Redis protocol using X25519 for encryption and Ed25519 for signatures. Keys can be used in stateless (ephemeral) or key-managed (persistent, named) modes.
If you are new to the codebase, the exact tests that exercise these behaviors are:
- [rust.test_07_age_stateless_suite()](herodb/tests/usage_suite.rs:495)
- [rust.test_08_age_persistent_named_suite()](herodb/tests/usage_suite.rs:555)
In key-managed mode, HeroDB uses a unified keypair concept: a single Ed25519 signing key is deterministically derived into X25519 keys for encryption, allowing one keypair to handle both encryption and signatures transparently.
Implementation entry points:
- [herodb/src/age.rs](herodb/src/age.rs)
- Dispatch from [herodb/src/cmd.rs](herodb/src/cmd.rs)
## Cryptographic Algorithms
Note: Database-at-rest encryption flags in the test harness are unrelated to AGE commands; those flags control storage-level encryption of DB files. See the harness near [rust.start_test_server()](herodb/tests/usage_suite.rs:10).
### X25519 (Encryption)
- Elliptic-curve Diffie-Hellman key exchange for symmetric key derivation.
- Used for encrypting/decrypting messages.
## Quick start
### Ed25519 (Signatures)
- EdDSA digital signatures for message authentication.
- Used for signing/verifying messages.
Assuming the server is running on localhost on some $PORT:
### Key Derivation
Ed25519 signing keys are deterministically converted to X25519 keys for encryption. This enables a single keypair to support both operations without additional keys. Derivation uses the Ed25519 secret scalar clamped for X25519.
In named keypairs, Ed25519 keys are stored, and X25519 keys are derived on-demand and cached.
## Stateless Mode (Ephemeral Keys)
No server-side storage; keys are provided with each command.
Available commands:
- `AGE GENENC`: Generate ephemeral X25519 keypair. Returns `[recipient, identity]`.
- `AGE GENSIGN`: Generate ephemeral Ed25519 keypair. Returns `[verify_pub, sign_secret]`.
- `AGE ENCRYPT <recipient> <message>`: Encrypt message. Returns base64 ciphertext.
- `AGE DECRYPT <identity> <ciphertext_b64>`: Decrypt ciphertext. Returns plaintext.
- `AGE SIGN <sign_secret> <message>`: Sign message. Returns base64 signature.
- `AGE VERIFY <verify_pub> <message> <signature_b64>`: Verify signature. Returns 1 (valid) or 0 (invalid).
Example:
```bash
~/code/git.ourworld.tf/herocode/herodb/herodb/build.sh
~/code/git.ourworld.tf/herocode/herodb/target/release/herodb --dir /tmp/data --debug --$PORT 6381 --encryption-key 1234 --encrypt
```
redis-cli AGE GENENC
# → 1) "age1qz..." # recipient (X25519 public)
# 2) "AGE-SECRET-KEY-1..." # identity (X25519 secret)
redis-cli AGE ENCRYPT "age1qz..." "hello"
# → base64_ciphertext
```bash
export PORT=6381
# Generate an ephemeral keypair and encrypt/decrypt a message (stateless mode)
redis-cli -p $PORT AGE GENENC
# → returns an array: [recipient, identity]
redis-cli -p $PORT AGE ENCRYPT <recipient> "hello world"
# → returns ciphertext (base64 in a bulk string)
redis-cli -p $PORT AGE DECRYPT <identity> <ciphertext_b64>
# → returns "hello world"
```
For key‑managed mode, generate a named key once and reference it by name afterwards:
```bash
redis-cli -p $PORT AGE KEYGEN app1
# → persists encryption keypair under name "app1"
redis-cli -p $PORT AGE ENCRYPTNAME app1 "hello"
redis-cli -p $PORT AGE DECRYPTNAME app1 <ciphertext_b64>
```
## Stateless AGE (ephemeral)
Characteristics
- No server‑side storage of keys.
- You pass the actual key material with every call.
- Not listable via AGE LIST.
Commands and examples
1) Ephemeral encryption keys
```bash
# Generate an ephemeral encryption keypair
redis-cli -p $PORT AGE GENENC
# Example output (abridged):
# 1) "age1qz..." # recipient (public key) = can be used by others e.g. to verify what I sign
# 2) "AGE-SECRET-KEY-1..." # identity (secret) = is like my private, cannot lose this one
# Encrypt with the recipient public key
redis-cli -p $PORT AGE ENCRYPT "age1qz..." "hello world"
# → returns bulk string payload: base64 ciphertext (encrypted content)
# Decrypt with the identity (secret) in other words your private key
redis-cli -p $PORT AGE DECRYPT "AGE-SECRET-KEY-1..." "<ciphertext_b64>"
# → "hello world"
```
2) Ephemeral signing keys
> ? is this same as my private key
```bash
# Generate an ephemeral signing keypair
redis-cli -p $PORT AGE GENSIGN
# Example output:
# 1) "<verify_pub_b64>"
# 2) "<sign_secret_b64>"
# Sign a message with the secret
redis-cli -p $PORT AGE SIGN "<sign_secret_b64>" "msg"
# → returns "<signature_b64>"
# Verify with the public key
redis-cli -p $PORT AGE VERIFY "<verify_pub_b64>" "msg" "<signature_b64>"
# → 1 (valid) or 0 (invalid)
```
When to use
- You do not want the server to store private keys.
- You already manage key material on the client side.
- You need ad‑hoc operations without persistence.
Reference test: [rust.test_07_age_stateless_suite()](herodb/tests/usage_suite.rs:495)
## Key‑managed AGE (persistent, named)
Characteristics
- Server generates and persists keypairs under a chosen name.
- Clients refer to keys by name; raw secrets are not supplied on each call.
- Keys are discoverable via AGE LIST.
Commands and examples
1) Named encryption keys
```bash
# Create/persist a named encryption keypair
redis-cli -p $PORT AGE KEYGEN app1
# → returns [recipient, identity] but also stores them under name "app1"
> TODO: should not return identity (security, but there can be separate function to export it e.g. AGE EXPORTKEY app1)
# Encrypt using the stored public key
redis-cli -p $PORT AGE ENCRYPTNAME app1 "hello"
# → returns bulk string payload: base64 ciphertext
# Decrypt using the stored secret
redis-cli -p $PORT AGE DECRYPTNAME app1 "<ciphertext_b64>"
redis-cli AGE DECRYPT "AGE-SECRET-KEY-1..." base64_ciphertext
# → "hello"
```
2) Named signing keys
## Key-Managed Mode (Persistent Named Keys)
Keys are stored server-side under names. Supports unified keypairs for both encryption and signatures.
Available commands:
- `AGE KEYGEN <name>`: Generate and store unified keypair. Returns `[recipient, identity]` in age format.
- `AGE SIGNKEYGEN <name>`: Generate and store Ed25519 signing keypair. Returns `[verify_pub, sign_secret]`.
- `AGE ENCRYPTNAME <name> <message>`: Encrypt with named key. Returns base64 ciphertext.
- `AGE DECRYPTNAME <name> <ciphertext_b64>`: Decrypt with named key. Returns plaintext.
- `AGE SIGNNAME <name> <message>`: Sign with named key. Returns base64 signature.
- `AGE VERIFYNAME <name> <message> <signature_b64>`: Verify with named key. Returns 1 or 0.
- `AGE LIST`: List all stored key names. Returns sorted array of names.
### AGE LIST Output
Returns a flat, deduplicated, sorted array of key names (strings). Each name corresponds to a stored keypair, which may include encryption keys (X25519), signing keys (Ed25519), or both.
Output format: `["name1", "name2", ...]`
Example:
```bash
# Create/persist a named signing keypair
redis-cli -p $PORT AGE SIGNKEYGEN app1
# → returns [verify_pub_b64, sign_secret_b64] and stores under name "app1"
> TODO: should not return sign_secret_b64 (for security, but there can be separate function to export it e.g. AGE EXPORTSIGNKEY app1)
# Sign using the stored secret
redis-cli -p $PORT AGE SIGNNAME app1 "msg"
# → returns "<signature_b64>"
# Verify using the stored public key
redis-cli -p $PORT AGE VERIFYNAME app1 "msg" "<signature_b64>"
# → 1 (valid) or 0 (invalid)
redis-cli AGE LIST
# → 1) "<named_keypair_1>"
# 2) "<named_keypair_2>"
```
3) List stored AGE keys
For unified keypairs (from `AGE KEYGEN`), the name handles both encryption (derived X25519) and signatures (stored Ed25519) transparently.
Example with named keys:
```bash
redis-cli -p $PORT AGE LIST
# Example output includes labels such as "encpub" and your key names (e.g., "app1")
redis-cli AGE KEYGEN app1
# → 1) "age1..." # recipient
# 2) "AGE-SECRET-KEY-1..." # identity
redis-cli AGE ENCRYPTNAME app1 "secret message"
# → base64_ciphertext
redis-cli AGE DECRYPTNAME app1 base64_ciphertext
# → "secret message"
redis-cli AGE SIGNNAME app1 "message"
# → base64_signature
redis-cli AGE VERIFYNAME app1 "message" base64_signature
# → 1
```
When to use
- You want centralized key storage/rotation and fewer secrets on the client.
- You need names/labels for workflows and can trust the server with secrets.
- You want discoverability (AGE LIST) and simpler client commands.
## Choosing a Mode
- **Stateless**: For ad-hoc operations without persistence; client manages keys.
- **Key-managed**: For centralized key lifecycle; server stores keys for convenience and discoverability.
Reference test: [rust.test_08_age_persistent_named_suite()](herodb/tests/usage_suite.rs:555)
## Choosing a mode
- Prefer Stateless when:
- Minimizing server trust for secret material is the priority.
- Clients already have a secure mechanism to store/distribute keys.
- Prefer Key‑managed when:
- Centralized lifecycle, naming, and discoverability are beneficial.
- You plan to integrate rotation, ACLs, or auditability on the server side.
## Security notes
- Treat identities and signing secrets as sensitive; avoid logging them.
- For key‑managed mode, ensure server storage (and backups) are protected.
- AGE operations here are application‑level crypto and are distinct from database-at-rest encryption configured in the test harness.
## Repository pointers
- Stateless examples in tests: [rust.test_07_age_stateless_suite()](herodb/tests/usage_suite.rs:495)
- Key‑managed examples in tests: [rust.test_08_age_persistent_named_suite()](herodb/tests/usage_suite.rs:555)
- AGE implementation: [herodb/src/age.rs](herodb/src/age.rs)
- Command dispatch: [herodb/src/cmd.rs](herodb/src/cmd.rs)
- Bash demo: [herodb/examples/age_bash_demo.sh](herodb/examples/age_bash_demo.sh)
- Rust persistent demo: [herodb/examples/age_persist_demo.rs](herodb/examples/age_persist_demo.rs)
- Additional notes: [herodb/instructions/encrypt.md](herodb/instructions/encrypt.md)
Implementation: [herodb/src/age.rs](herodb/src/age.rs) <br>
Tests: [herodb/tests/usage_suite.rs](herodb/tests/usage_suite.rs)

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Here's an expanded version of the cmds.md documentation to include the list commands:
# HeroDB Basics
## Launching HeroDB
To launch HeroDB, use the binary with required and optional flags. The `--admin-secret` flag is mandatory, encrypting the admin database (DB 0) and authorizing admin access.
### Launch Flags
- `--dir <path>`: Directory for database files (default: current directory).
- `--port <port>`: TCP port for Redis protocol (default: 6379).
- `--debug`: Enable debug logging.
- `--sled`: Use Sled backend (default: Redb).
- `--enable-rpc`: Start JSON-RPC management server on port 8080.
- `--rpc-port <port>`: Custom RPC port (default: 8080).
- `--admin-secret <secret>`: Required secret for DB 0 encryption and admin access.
Example:
```bash
./target/release/herodb --dir /tmp/herodb --admin-secret mysecret --port 6379 --enable-rpc
```
Deprecated flags (`--encrypt`, `--encryption-key`) are ignored for data DBs; per-database encryption is managed via RPC.
## Admin Database (DB 0)
DB 0 acts as the administrative database instance, storing metadata for all user databases (IDs >= 1). It controls existence, access control, and per-database encryption. DB 0 is always encrypted with the `--admin-secret`.
When creating a new database, DB 0 allocates an ID, registers it, and optionally stores a per-database encryption key (write-only). Databases are public by default; use RPC to set them private, requiring access keys for SELECT (read or readwrite based on permissions). Keys are persisted in DB 0 for managed AGE operations.
Access DB 0 with `SELECT 0 KEY <admin-secret>`.
## Symmetric Encryption
HeroDB supports stateless symmetric encryption via SYM commands, using XChaCha20-Poly1305 AEAD.
Commands:
- `SYM KEYGEN`: Generate 32-byte key. Returns base64-encoded key.
- `SYM ENCRYPT <key_b64> <message>`: Encrypt message. Returns base64 ciphertext.
- `SYM DECRYPT <key_b64> <ciphertext_b64>`: Decrypt. Returns plaintext.
Example:
```bash
redis-cli SYM KEYGEN
# → base64_key
redis-cli SYM ENCRYPT base64_key "secret"
# → base64_ciphertext
redis-cli SYM DECRYPT base64_key base64_ciphertext
# → "secret"
```
## RPC Options
Enable the JSON-RPC server with `--enable-rpc` for database management. Methods include creating databases, managing access keys, and setting encryption. See [JSON-RPC Examples](./rpc_examples.md) for payloads.
# HeroDB Commands
HeroDB implements a subset of Redis commands over the Redis protocol. This document describes the available commands and their usage.
@@ -575,6 +629,29 @@ redis-cli -p $PORT AGE LIST
# 2) "keyname2"
```
## SYM Commands
### SYM KEYGEN
Generate a symmetric encryption key.
```bash
redis-cli -p $PORT SYM KEYGEN
# → base64_encoded_32byte_key
```
### SYM ENCRYPT
Encrypt a message with a symmetric key.
```bash
redis-cli -p $PORT SYM ENCRYPT <key_b64> "message"
# → base64_encoded_ciphertext
```
### SYM DECRYPT
Decrypt a ciphertext with a symmetric key.
```bash
redis-cli -p $PORT SYM DECRYPT <key_b64> <ciphertext_b64>
# → decrypted_message
```
## Server Information Commands
### INFO
@@ -621,3 +698,27 @@ This expanded documentation includes all the list commands that were implemented
10. LINDEX - get element by index
11. LRANGE - get range of elements
## Updated Database Selection and Access Keys
HeroDB uses an `Admin DB 0` to control database existence, access, and encryption. Access to data DBs can be public (no key) or private (requires a key). See detailed model in `docs/admin.md`.
Examples:
```bash
# Public database (no key required)
redis-cli -p $PORT SELECT 1
# → OK
```
```bash
# Private database (requires access key)
redis-cli -p $PORT SELECT 2 KEY my-db2-access-key
# → OK
```
```bash
# Admin DB 0 (requires admin secret)
redis-cli -p $PORT SELECT 0 KEY my-admin-secret
# → OK
```

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@@ -122,4 +122,27 @@ redis-cli -p 6379 --rdb dump.rdb
# Import to sled
redis-cli -p 6381 --pipe < dump.rdb
```
## Authentication and Database Selection
HeroDB uses an `Admin DB 0` to govern database existence, access and per-db encryption. Access control is enforced via `Admin DB 0` metadata. See the full model in `docs/admin.md`.
Examples:
```bash
# Public database (no key required)
redis-cli -p $PORT SELECT 1
# → OK
```
```bash
# Private database (requires access key)
redis-cli -p $PORT SELECT 2 KEY my-db2-access-key
# → OK
```
```bash
# Admin DB 0 (requires admin secret)
redis-cli -p $PORT SELECT 0 KEY my-admin-secret
# → OK
```

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# HeroDB JSON-RPC Examples
These examples show full JSON-RPC 2.0 payloads for managing HeroDB via the RPC API (enable with `--enable-rpc`). Methods are named as `hero_<function>`. Params are positional arrays; enum values are strings (e.g., `"Redb"`). Copy-paste into Postman or similar clients.
## Database Management
### Create Database
Creates a new database with optional per-database encryption key (stored write-only in Admin DB 0).
```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "hero_createDatabase",
"params": [
"Redb",
{ "name": null, "storage_path": null, "max_size": null, "redis_version": null },
null
]
}
```
With encryption:
```json
{
"jsonrpc": "2.0",
"id": 2,
"method": "hero_createDatabase",
"params": [
"Sled",
{ "name": "secure-db", "storage_path": null, "max_size": null, "redis_version": null },
"my-per-db-encryption-key"
]
}
```
### List Databases
Returns array of database infos (id, backend, encrypted status, size, etc.).
```json
{
"jsonrpc": "2.0",
"id": 3,
"method": "hero_listDatabases",
"params": []
}
```
### Get Database Info
Retrieves detailed info for a specific database.
```json
{
"jsonrpc": "2.0",
"id": 4,
"method": "hero_getDatabaseInfo",
"params": [1]
}
```
### Delete Database
Removes physical database file; metadata remains in Admin DB 0.
```json
{
"jsonrpc": "2.0",
"id": 5,
"method": "hero_deleteDatabase",
"params": [1]
}
```
## Access Control
### Add Access Key
Adds a hashed access key for private databases. Permissions: `"read"` or `"readwrite"`.
```json
{
"jsonrpc": "2.0",
"id": 6,
"method": "hero_addAccessKey",
"params": [2, "my-access-key", "readwrite"]
}
```
### List Access Keys
Returns array of key hashes, permissions, and creation timestamps.
```json
{
"jsonrpc": "2.0",
"id": 7,
"method": "hero_listAccessKeys",
"params": [2]
}
```
### Delete Access Key
Removes key by its SHA-256 hash.
```json
{
"jsonrpc": "2.0",
"id": 8,
"method": "hero_deleteAccessKey",
"params": [2, "0123abcd...keyhash..."]
}
```
### Set Database Public/Private
Toggles public access (default true). Private databases require access keys.
```json
{
"jsonrpc": "2.0",
"id": 9,
"method": "hero_setDatabasePublic",
"params": [2, false]
}
```
## Server Info
### Get Server Stats
Returns stats like total databases and uptime.
```json
{
"jsonrpc": "2.0",
"id": 10,
"method": "hero_getServerStats",
"params": []
}
```
## Notes
- Per-database encryption keys are write-only; set at creation and used transparently.
- Access keys are hashed (SHA-256) for storage; provide plaintext in requests.
- Backend options: `"Redb"` (default) or `"Sled"`.
- Config object fields (name, storage_path, etc.) are optional and currently ignored but positional.