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$ show dkron-io/dkron

[account ↗] [repo ↗] APPLICATION ★ 4733 418 ● active (last update 1 month ago)
── AI DEEP ANALYSIS ──
reviewed by: deepseek/deepseek-v4-flash

Dkron is a production-grade, distributed cron and job scheduling system written in Go. It runs as a cluster of nodes coordinated via HashiCorp Raft for consensus and Serf for membership, providing fault tolerance and automatic leader election. The system exposes a REST API, a gRPC API, and an embedded React admin UI. Jobs are executed through a plugin architecture supporting multiple executors (shell, HTTP, Kafka, NATS, RabbitMQ, Google Cloud Pub/Sub, gRPC) and processors (log, file, syslog, Fluentd). The scheduler extends standard cron syntax with custom descriptors like @at, @after, and @manually, and supports retries, concurrency control, job chaining, and notifications via email/webhook. State is persisted in embedded BuntDB for application data and BoltDB for the Raft log, with optional cloud auto-join via go-discover. The project also includes a commercial Pro tier (ACL, encryption, failover) referenced in the codebase, but the core open-source code is fully functional and well-tested with unit, integration, and end-to-end tests.

── METRICS ──
RATING9.2/10
QUALITY8.3/10
MAINTENANCEactive
DRIFTlow
CONTRIBUTORS96
VELOCITY0.92
OPEN ISSUES46
CLOSED ISSUES582
LAST COMMIT1 month ago
── TAGS ──
#distributed-scheduler #cron #job-scheduling #raft #golang #devops #plugin-architecture #serf #scheduled-jobs #fault-tolerance #distributed-systems
── GITHUB TOPICS ──
scheduled-jobs fault-tolerance cron distributed-systems
── DEPENDENCY GRAPH ──
cloud.google.com/go/pubsub (go) v1.51.0
github.com/IBM/sarama (go) v1.60.1
github.com/armon/circbuf (go) v0.0.0-20190214190532-5111143e8da2
github.com/devopsfaith/krakend-usage (go) v1.4.0
github.com/fluent/fluent-logger-golang (go) v1.10.1
github.com/fullstorydev/grpcurl (go) v1.9.3
github.com/gin-contrib/cors (go) v1.7.7
github.com/gin-contrib/expvar (go) v1.0.4
github.com/gin-gonic/gin (go) v1.12.0
github.com/hashicorp/go-discover (go) v1.4.0
github.com/hashicorp/go-hclog (go) v1.6.3
github.com/hashicorp/go-metrics (go) v0.6.1
github.com/hashicorp/go-multierror (go) v1.1.1
github.com/hashicorp/go-plugin (go) v1.8.0
github.com/hashicorp/go-sockaddr (go) v1.0.7
github.com/hashicorp/go-syslog (go) v1.0.0
github.com/hashicorp/go-uuid (go) v1.0.3
github.com/hashicorp/go-version (go) v1.9.0
github.com/hashicorp/golang-lru (go) v1.0.2
github.com/hashicorp/memberlist (go) v0.6.0
github.com/hashicorp/raft (go) v1.7.3
github.com/hashicorp/raft-boltdb (go) v0.0.0-20231211162105-6c830fa4535e
github.com/hashicorp/serf (go) v0.10.4
github.com/jhump/protoreflect (go) v1.18.0
github.com/jordan-wright/email (go) v4.0.1-0.20210109023952-943e75fe5223+incompatible
github.com/kardianos/osext (go) v0.0.0-20190222173326-2bc1f35cddc0
github.com/mattn/go-shellwords (go) v1.0.14
github.com/nats-io/nats.go (go) v1.53.1
github.com/pkg/errors (go) v0.9.1
github.com/prometheus/client_golang (go) v1.24.1
github.com/rabbitmq/amqp091-go (go) v1.13.0
github.com/robfig/cron/v3 (go) v3.0.1
github.com/ryanuber/columnize (go) v2.1.2+incompatible
github.com/shirou/gopsutil/v3 (go) v3.24.5
github.com/sirupsen/logrus (go) v1.10.0
github.com/soheilhy/cmux (go) v0.1.5
github.com/spf13/cobra (go) v1.10.2
github.com/spf13/pflag (go) v1.0.10
github.com/spf13/viper (go) v1.21.0
github.com/stretchr/testify (go) v1.12.1
github.com/tidwall/buntdb (go) v1.3.2
github.com/xdg-go/scram (go) v1.2.0
go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin (go) v0.69.0
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc (go) v0.70.0
go.opentelemetry.io/otel (go) v1.45.0
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc (go) v1.45.0
go.opentelemetry.io/otel/sdk (go) v1.45.0
go.opentelemetry.io/otel/trace (go) v1.45.0
golang.org/x/net (go) v0.58.0
google.golang.org/grpc (go) v1.83.0
google.golang.org/protobuf (go) v1.36.12
cloud.google.com/go (go) v0.123.0
cloud.google.com/go/auth (go) v0.20.0
cloud.google.com/go/auth/oauth2adapt (go) v0.2.8
cloud.google.com/go/compute/metadata (go) v0.9.0
cloud.google.com/go/iam (go) v1.11.0
cloud.google.com/go/pubsub/v2 (go) v2.6.0
github.com/Azure/azure-sdk-for-go/sdk/azcore (go) v1.21.1
github.com/Azure/azure-sdk-for-go/sdk/azidentity (go) v1.13.1
github.com/Azure/azure-sdk-for-go/sdk/internal (go) v1.12.0
github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork (go) v1.1.0
github.com/Azure/go-autorest (go) v14.2.0+incompatible
github.com/Azure/go-autorest/autorest (go) v0.11.18
github.com/Azure/go-autorest/autorest/adal (go) v0.9.24
github.com/Azure/go-autorest/autorest/date (go) v0.3.0
github.com/Azure/go-autorest/logger (go) v0.2.1
github.com/Azure/go-autorest/tracing (go) v0.6.0
github.com/AzureAD/microsoft-authentication-library-for-go (go) v1.6.0
github.com/DataDog/datadog-go (go) v4.8.3+incompatible
github.com/Microsoft/go-winio (go) v0.6.2
github.com/TritonDataCenter/triton-go/v2 (go) v2.0.0-pre4
github.com/armon/go-metrics (go) v0.4.1
github.com/aws/aws-sdk-go-v2 (go) v1.33.0
github.com/aws/aws-sdk-go-v2/config (go) v1.29.1
github.com/aws/aws-sdk-go-v2/credentials (go) v1.17.54
github.com/aws/aws-sdk-go-v2/feature/ec2/imds (go) v1.16.24
github.com/aws/aws-sdk-go-v2/internal/configsources (go) v1.3.28
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 (go) v2.6.28
github.com/aws/aws-sdk-go-v2/internal/ini (go) v1.8.1
github.com/aws/aws-sdk-go-v2/service/ec2 (go) v1.200.0
github.com/aws/aws-sdk-go-v2/service/ecs (go) v1.53.8
github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding (go) v1.12.1
github.com/aws/aws-sdk-go-v2/service/internal/presigned-url (go) v1.12.9
github.com/aws/aws-sdk-go-v2/service/sso (go) v1.24.11
github.com/aws/aws-sdk-go-v2/service/ssooidc (go) v1.28.10
github.com/aws/aws-sdk-go-v2/service/sts (go) v1.33.9
github.com/aws/smithy-go (go) v1.22.1
github.com/beorn7/perks (go) v1.0.1
github.com/boltdb/bolt (go) v1.3.1
github.com/bytedance/gopkg (go) v0.1.4
github.com/bytedance/sonic (go) v1.15.1
github.com/bytedance/sonic/loader (go) v0.5.1
github.com/catalinc/hashcash (go) v0.0.0-20161205220751-e6bc29ff4de9
github.com/cenkalti/backoff/v5 (go) v5.0.3
github.com/cespare/xxhash/v2 (go) v2.3.0
github.com/cloudwego/base64x (go) v0.1.7
github.com/cncf/xds/go (go) v0.0.0-20260202195803-dba9d589def2
github.com/cpuguy83/go-md2man/v2 (go) v2.0.6
github.com/davecgh/go-spew (go) v1.1.2-0.20180830191138-d8f796af33cc
github.com/denverdino/aliyungo (go) v0.0.0-20170926055100-d3308649c661
── FILE BREAKDOWN ──
Files by Type (count)
Markdown
312
Go
123
Other (.png)
37
TSX
36
JSON
28
YAML
24
JavaScript
21
TypeScript
11
Other (no ext)
10
Other (.svg)
10
Protocol Buffers
5
Shell
5
Files by Type (size)
Other (.png)
3MB
JavaScript
1MB
YAML
801KB
Go
716KB
Markdown
584KB
Other (.jpg)
407KB
TSX
137KB
Other (.sum)
134KB
Other (.svg)
107KB
Other (.ico)
44KB
Other (.bats)
32KB
Other (no ext)
27KB
── KEY FINDINGS: REUSABLE CODE ──

The LLM identified 4 files worth highlighting for reuse:

An extended cron expression parser that adds custom schedule descriptors (@at, @after, @manually, @minutely) on top of standard cron fields. It is isolated, dependency-light, fully unit-tested, and can be extracted into any Go project requiring richer scheduling expressions.

file: extcron/extparser.go ↗ | tags: #cron-parser #custom-syntax #scheduler

A nullable time type with JSON marshaling/unmarshaling supporting full RFC3339 timestamps, datetime-local formats, and explicit null values. This is a self-contained utility that solves a recurring API/JSON problem and can be reused independently.

file: ntime/nullabletime.go ↗ | tags: #time-parsing #json-serialization #nullable

An HTTP executor plugin demonstrating a robust HTTP client pool with LRU eviction and support for TLS client certificates. It implements connection reuse, timeout handling, and output buffering via circbuf. While it references the plugin interface, the client-pool pattern is a reusable template for high-throughput outbound HTTP integrations.

file: plugin/http/http.go ↗ | tags: #http-client #connection-pooling #lru-cache

A gRPC client wrapper that implements exponential backoff retry logic for remote job execution. It is a self-contained pattern for building resilient RPC clients and managing retries with jitter, applicable to any distributed system needing reliable gRPC calls.

file: dkron/grpc_client.go ↗ | tags: #grpc-client #retry #backoff
── HISTORY ──
Last analyzed: 2026-09-03 10:15:18.967363
Next check: 2026-09-10 10:15:18.964193
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