ServStore

A cloud-native, distributed, AI-native, S3-compatible object storage engine.
ServStore is an open-source alternative to MinIO — built for strong consistency, high scalability, and intelligent data access.

About

ServStore is a production-grade distributed object storage engine written in pure Go. It was designed to be a self-hostable, cloud-native alternative to MinIO and AWS S3 — while going further with an AI-native storage layer that brings semantic search, time travel queries, and serverless compute-near-data directly into the storage engine.

Property	Detail
Author	yuvaraj
Language	Go 1.22+
License	Apache 2.0
S3 API	AWS S3 REST compatible (Signature V4)
Consensus	Raft-based strong consistency
WASM Runtime	wazero (pure-Go, zero-CGO)
Status	Phases 1–6 complete ✅

ServStore now combines a production-grade distributed storage engine with a full AI-native layer: semantic search, time travel queries, serverless compute-near-data (WASM), and hybrid cloud cold-storage tiering.

Key Features

S3 Compatibility & Core Storage

S3-Compatible REST API: Full support for bucket and object lifecycle — PUT, GET, DELETE, HEAD, list, delete markers, and S3-style XML responses.
S3 Multipart Uploads: InitiateMultipartUpload, UploadPart, CompleteMultipartUpload, and AbortMultipartUpload for streaming large files.
Object Versioning: Enabled / Suspended / Disabled states matching AWS S3 semantics. Delete markers and permanent version deletion supported.
Object Locking (WORM): Write-once-read-many locks with configurable retain-until dates. Locked objects reject modification and deletion until expiry.
Lifecycle Policies: Auto-expire objects after N days. Configurable prefix-scoped rules applied by a background goroutine.

Security & Access Control

AWS Signature V4 Authentication: Full HMAC-SHA256 request signing compatible with any S3 SDK.
AES-256-GCM Encryption-at-Rest: Optional per-object encryption enabled via --encryption-key. Passphrase is SHA-256 derived. Fully transparent to S3 clients.
TLS 1.3 Enforcement: Optional HTTPS with forced TLS 1.3 minimum. Graceful HTTP fallback when not configured.
JWT / OIDC / LDAP Integration: Console and API authentication via configurable identity providers.
RBAC: Role-based access control with user policy management (PutUserPolicy, GetUserPolicy, DeleteUserPolicy).

Distributed System

Gossip Membership Protocol: Lightweight node discovery and failure detection. Nodes detect and evict unresponsive peers automatically.
Raft Consensus Engine: All metadata mutations proposed through Raft for strong consistency across the cluster.
Consistent Hash Ring: Virtual-node hash ring (CRUSH-style) for balanced data placement. Node weight adjustable at runtime.
Horizontal Scaling: Add nodes dynamically via POST /console/cluster/join. Background rebalancer redistributes existing objects to new nodes without downtime.
Peer-to-Peer Auto-healing: Detects offline nodes, identifies under-replicated objects, and rebuilds replicas in the background.
Reed-Solomon Erasure Coding: Configurable data/parity shard ratio (default 2+1). Tolerates shard loss without full replication overhead.
Cross-Region Replication (CRR): Asynchronously replicates PUT/DELETE across geographic regions. Loop-prevention via X-ServStore-Region-Source headers. Active-active topology.
BLAKE3 Data Integrity: End-to-end checksums computed on PUT, validated on GET. Detects bit rot and storage corruption on-the-fly with failover to healthy replicas.

AI-Native Storage Engine (Phase 5)

Content-Addressed Storage (CAS): Enable deduplication on any bucket. Objects are stored as cas-<blake3>, with reference-counted GC — data is only deleted when the last reference is removed.
Time Travel Queries: Retrieve the state of any object at any historical timestamp: GET /<bucket>/<key>?at=2025-01-01T00:00:00Z. Resolved against version LastModified metadata — no extra storage overhead.
Semantic Search: Built-in TF-IDF vector indexing on text objects. Cosine similarity ranking. S3-compatible query API: GET /<bucket>?query=semantic&q=<text>&max-results=N. Encryption-aware (decrypts before indexing).
Auto-Embedding Pipeline: Text documents (.txt, .md, text/*) are automatically indexed on PutObject — no explicit pipeline step required.
Serverless WASM Transforms (Compute Near Data): Upload any WASI-compatible .wasm binary as an object. Execute it server-side against any other object via POST /<bucket>/<wasm>?transform=true&target-key=<obj>&mem-limit=64&timeout=30. Powered by wazero — pure-Go, zero-CGO, zero-host-filesystem-access.
WASM Sandbox Limits: Configurable memory page ceiling and wall-clock timeout per invocation. Each call gets a fresh, isolated wazero.Runtime instance — no shared mutable state.
Cold Storage Tiering: Async archival of cold CAS blocks to any S3-compatible cold-storage backend (AWS S3 Glacier, Backblaze B2, MinIO). Transparent re-hydration on GetObject. .cold stub tracks remote URL, archive time, and size. Zero new dependencies — uses stdlib net/http.

Observability & Operations

OpenTelemetry Tracing: Lightweight custom OTel client exporting spans for all HTTP routes and storage I/O. Zero external dependencies.
Prometheus Metrics: Custom registry exposing request rate, latency histograms, storage utilization, in-flight connection counts, and cluster state at /metrics.
Structured JSON Logging: All requests logged in structured slog JSON format with trace IDs, method, path, status, and duration.

Developer Experience

Single-Binary Deployment: Frontend web console assets are embedded directly into the compiled Go binary. Zero file dependencies at runtime.
Web Console: Premium glassmorphic dark-mode admin UI with drag-and-drop uploads, bucket management, versioning controls, and object version history viewer.
ServStore CLI (servstore-cli): Terminal client supporting mb, rb, ls, put, get, rm, policy, and cluster management commands against any ServStore endpoint.
serv-lang Native Client: Out-of-the-box integration with the serv-lang DSL standard library (stdlib/s3.srv), supporting bucket creation, versioning, CRUD, time travel, and semantic search.

Directory Structure

ServStore/
├── cmd/
│   ├── servstore/
│   │   └── main.go                   # Server entry point, CLI flags, TLS & encryption config
│   ├── servstore-cli/
│   │   └── main.go                   # CLI client (mb, rb, ls, put, get, rm, policy)
│   ├── operator/
│   │   └── main.go                   # Kubernetes Operator Manager binary
│   └── csi-driver/
│       └── main.go                   # CSI Node Plugin gRPC stub
├── deploy/
│   ├── crds/                         # Kubernetes Custom Resource Definitions (CRDs)
│   │   ├── servstorebucket.yaml
│   │   ├── servstorecluster.yaml
│   │   └── servstorecredential.yaml
│   └── helm/
│       └── servstore/                # Kubernetes Helm Chart for Cluster & Operator
├── pkg/
│   ├── auth/
│   │   └── auth.go                   # AWS Signature V4 authentication + JWT/OIDC/LDAP
│   ├── cluster/
│   │   ├── membership.go             # Gossip protocol, node timeouts & Hash Ring logic
│   │   ├── healing.go                # P2P auto-healing & dynamic rebalancing
│   │   ├── crr.go                    # Cross-Region Replication (CRR) Manager
│   │   ├── placement.go              # Consistent hashing ring implementation
│   │   ├── raft_node.go              # Raft consensus node for consistent metadata
│   │   ├── rebalance_test.go         # Integration tests for dynamic scale-out rebalancing
│   │   └── crr_test.go               # Integration tests for Cross-Region Replication
│   ├── metrics/
│   │   ├── metrics.go                # Zero-dependency Prometheus metrics registry
│   │   └── metrics_test.go           # Unit tests for metrics serialisation
│   ├── operator/
│   │   ├── register.go               # Scheme registration for CRDs
│   │   ├── types.go                  # Go spec and status structures for CRDs
│   │   └── controllers/
│   │       ├── cluster_controller.go # StatefulSet & Rolling Upgrade reconciler
│   │       ├── bucket_controller.go  # S3 bucket configuration reconciler
│   │       ├── credential_controller.go # Secret to S3 policy mapping reconciler
│   │       └── operator_test.go      # Operator unit tests
│   ├── otel/
│   │   ├── otel.go                   # Lightweight OpenTelemetry tracing client
│   │   └── otel_test.go              # Unit tests for OTel tracing
│   ├── ratelimit/
│   │   ├── limiter.go                # Tenant-isolated token-bucket rate limiter
│   │   └── limiter_test.go           # Limiter unit tests
│   ├── s3/
│   │   ├── api.go                    # S3 API router, gateway handlers & failover routing
│   │   ├── xml.go                    # S3-compliant XML request/response models
│   │   └── integrity_failover_test.go # Integration tests for BLAKE3 data integrity failover
│   ├── storage/
│   │   ├── store.go                  # StorageEngine interface definition
│   │   ├── local_store.go            # Versioned storage, CAS, encryption, WASM, cold tier
│   │   ├── crypto.go                 # AES-256-GCM encrypt/decrypt helpers
│   │   ├── vector.go                 # TF-IDF tokeniser & cosine similarity engine
│   │   ├── cold_tier.go              # Cold storage tiering — archive, stub, re-hydration
│   │   ├── cas_test.go               # Integration tests for CAS deduplication
│   │   ├── semantic_test.go          # Integration tests for semantic search
│   │   ├── time_travel_test.go       # Integration tests for time travel queries
│   │   ├── cold_tier_test.go         # Integration tests for cold storage tiering
│   │   ├── integrity_test.go         # Unit tests for BLAKE3 checksums & bit rot detection
│   │   ├── crypto_test.go            # Unit tests for encryption round-trips
│   │   └── local_store_test.go       # Storage engine test suite (versioning, multipart, WORM)
│   ├── wasm/
│   │   ├── runner.go                 # Sandboxed wazero WASI execution engine
│   │   └── runner_test.go            # Tests for WASM execution (uppercase, passthrough, limits)
│   └── web/
│       ├── server.go                 # Web Console static asset and API router wrapper
│       └── assets/                   # Web Console files (index.html, style.css, app.js)
├── go.mod                            # Module definition (github.com/tetratelabs/wazero added)
├── roadmap.md                        # Phase-wise implementation roadmap
└── README.md                         # Product documentation

Getting Started

Prerequisites

Go 1.22 or higher

1. Run Tests

go test ./...

2. Build the Server

go build -o servstore ./cmd/servstore

3. Run the Server

Basic (no auth, port 9000):

./servstore

With AWS Signature V4 auth:

./servstore --auth --access-key "yourAccessKey" --secret-key "yourSecretKey"

With AES-256 encryption at rest:

./servstore --encryption-key "my-strong-passphrase"

With TLS 1.3:

openssl req -x509 -newkey rsa:4096 -keyout server.key -out server.crt -days 365 -nodes -subj "/CN=localhost"
./servstore --tls-cert ./server.crt --tls-key ./server.key

With OpenTelemetry tracing:

$env:OTEL_ENDPOINT="http://localhost:4318"
$env:OTEL_SERVICE_NAME="servstore"
./servstore

4. Open the Web Console

Navigate to http://localhost:9000. From here you can:

Create and delete buckets.
Toggle versioning (Enabled / Suspended).
Drag and drop files to upload them.
Inspect metadata, download past versions, or permanently delete them.

AI-Native API Examples

Semantic Search

# Upload text documents (auto-indexed on ingest)
aws s3api put-object --bucket docs --key raft.txt --body raft.txt --content-type text/plain --endpoint-url http://localhost:9000

# Semantic search — returns ranked XML like ListObjects
curl "http://localhost:9000/docs?query=semantic&q=consensus+metadata+replication&max-results=3"

Time Travel

# Retrieve object state at a specific point in time
curl "http://localhost:9000/mybucket/config.json?at=2025-06-01T12:00:00Z"

# Via aws CLI
aws s3api get-object --bucket mybucket --key config.json \
  --query-string '?at=2025-06-01T12:00:00Z' /tmp/config-snapshot.json \
  --endpoint-url http://localhost:9000

WASM Compute-Near-Data

# Build and upload a WASI transform binary
GOOS=wasip1 GOARCH=wasm go build -o uppercase.wasm ./transforms/uppercase/
aws s3api put-object --bucket transforms --key uppercase.wasm --body uppercase.wasm --endpoint-url http://localhost:9000

# Upload the data to transform
aws s3api put-object --bucket transforms --key hello.txt --body hello.txt --endpoint-url http://localhost:9000

# Execute the transform server-side (returns transformed bytes)
curl -X POST "http://localhost:9000/transforms/uppercase.wasm?transform=true&target-key=hello.txt&mem-limit=64&timeout=30"

Cold Storage Tiering

# Configure cold tiering for a CAS bucket
curl -X PUT "http://localhost:9000/mybucket?cold-tier" \
  -H "Content-Type: application/json" \
  -d '{
    "endpoint": "https://s3.amazonaws.com",
    "remote_bucket": "cold-archive",
    "region": "us-east-1",
    "access_key": "AKIA...",
    "secret_key": "...",
    "min_age_days": 30,
    "scan_interval_min": 60
  }'

# Trigger an immediate sweep
curl -X POST "http://localhost:9000/mybucket?cold-tier&sweep"
# {"archived":5,"errors":[]}

# GetObject transparently re-hydrates archived blocks — no API changes needed
aws s3api get-object --bucket mybucket --key archived.bin /tmp/out.bin --endpoint-url http://localhost:9000

Kubernetes & Cloud-Native Deployment (Phase 4)

ServStore includes a custom Kubernetes Operator, Helm Chart package, and Container Storage Interface (CSI) node plugin.

1. Custom Resource Definitions (CRDs)

Deploy ServStore resources declaratively in Kubernetes:

# Create a 3-node S3 storage cluster with Reed-Solomon Erasure Coding enabled
apiVersion: storage.servstore.io/v1alpha1
kind: ServStoreCluster
metadata:
  name: my-s3-cluster
spec:
  replicas: 3
  image: ghcr.io/vyuvaraj/servstore:latest
  erasureCoding:
    enabled: true
    dataShards: 2
    parityShards: 1
  storage:
    size: 50Gi

2. Deploy using Helm

# Template or deploy the cluster and operator
helm install my-release ./deploy/helm/servstore

3. Tenant Rate Limiting

Apply QoS rate limits per namespace/tenant:

# Set rate-limiting header in requests to S3 Gateway
curl -H "X-ServStore-Namespace: tenant-alpha" http://localhost:9000/mybucket/file.txt

If traffic limits are exceeded, ServStore responds with HTTP 429 Too Many Requests and a dynamic Retry-After header.

Enterprise Hardening & Performance (Phase 6)

1. Resiliency & Chaos Mesh

Manifests are provided in deploy/chaos/ to execute automated testing:

pod-chaos.yaml: Intermittently fails pods to verify Raft leader re-election stability.
network-chaos.yaml: Simulates packet loss and network delay to verify gossip protocols.
io-chaos.yaml: Injects simulated read/write disk errors on /data to test S3 gateway failover routing.

2. Direct I/O Bypass

For objects larger than 16MB, ServStore automatically uses sector-aligned Direct I/O (FILE_FLAG_NO_BUFFERING on Windows) to bypass the OS page cache for direct disk throughput.

3. Parallel Hashing

When processing large objects (>8MB), ServStore automatically parallelizes BLAKE3 checksum calculations across multiple CPU threads using concurrent chunk hashing, performing root tree reduction.

Roadmap

See roadmap.md for the full phase-by-phase implementation plan. All Phases 1–6 are now 100% complete and fully verified.

Contributing

Contributions are welcome! Here's how to get started:

Fork the repository and create a feature branch:
```
git checkout -b feature/my-feature
```
Make your changes — follow Go conventions, add tests for new functionality.
Run the tests before submitting:
```
go test ./...
```
Open a Pull Request against the main branch with a clear description of what you changed and why.

Please open an issue first for major feature proposals so we can discuss the design before implementation begins.

Code Style

Standard Go formatting (gofmt / goimports)
All exported identifiers must have doc comments
New packages must include at least one _test.go file

License

Licensed under the Apache License, Version 2.0. You may not use this project except in compliance with the License.

A copy of the license is included in this repository: LICENSE

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Built with ❤️ in Go · github.com/vyuvaraj/ServStore

Name		Name	Last commit message	Last commit date
Latest commit History 60 Commits
.github/workflows		.github/workflows
cmd		cmd
deploy		deploy
pkg		pkg
.gitignore		.gitignore
Dockerfile		Dockerfile
IMPROVEMENTS.md		IMPROVEMENTS.md
LICENSE		LICENSE
README.md		README.md
docker-compose.yml		docker-compose.yml
go.mod		go.mod
go.sum		go.sum
roadmap.md		roadmap.md
servstore-cli.exe		servstore-cli.exe

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ServStore

About

Key Features

S3 Compatibility & Core Storage

Security & Access Control

Distributed System

AI-Native Storage Engine (Phase 5)

Observability & Operations

Developer Experience

Directory Structure

Getting Started

Prerequisites

1. Run Tests

2. Build the Server

3. Run the Server

4. Open the Web Console

AI-Native API Examples

Semantic Search

Time Travel

WASM Compute-Near-Data

Cold Storage Tiering

Kubernetes & Cloud-Native Deployment (Phase 4)

1. Custom Resource Definitions (CRDs)

2. Deploy using Helm

3. Tenant Rate Limiting

Enterprise Hardening & Performance (Phase 6)

1. Resiliency & Chaos Mesh

2. Direct I/O Bypass

3. Parallel Hashing

Roadmap

Contributing

Code Style

License

About

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