go4it

​## 序本文主要研究一下golang的Pseudo-versionsPseudo-versions定义Pseudo-versions，中文大概是伪版本的意思，就是没有打语义版本tag(semantic version tags)的会使用伪版本格式类似v0.0.0-yyyymmddhhmmss-abcdefabcdef，中间的时间为UTC时间(东八区为utc+8)，最后的12位为git commit的hash的前12位formsvX.0.0-yyyymmddhhmmss-abcdefabc

序本文主要介绍一下撰写技术文档中可能会用的一些画图工具。这里主要分为两大派，一派是直接拖拽完成，一派是通过代码来完成UI工具主要有processon、draw.io、excalidraw、archimatetool、cloudcraft.coprocesson架构图https://www.processon.com/view/6220b5de1e085333a8970d39?fromnew=1类图https://www.processon.com/view/556ff07de4b09b5

序使用golang开发了一阵子业务代码，本文主要梳理一下自己的使用感受，并总结一下常用的类库，方便查阅。由于本人是java重度使用者，不免加以对比吐槽一下，请见谅。go做业务开发?对比java这里说说用go做业务开发的感受：优点云原生首选，省内存挺适合写脚本的，可替代python缺点没使用好会panic，线上服务直接进程退出还挺严重的go没有maven的SNAPSHOT版本，基于commit hash加日期作为伪版本，很容易出现invalid version，体验非常不好，不

序本文主要研究一下tunny的workerWrapperworkerWrappertype workerWrapper struct { worker Worker interruptChan chan struct{} // reqChan is NOT owned by this type, it is used to send requests for work. reqChan chan<- workRequest // closeChan can be cl

序本文主要研究一下tunnyWorkertype Worker interface { // Process will synchronously perform a job and return the result. Process(interface{}) interface{} // BlockUntilReady is called before each job is processed and must block the // calling goroutine until

序本文主要研究一下xxl-job-executor-go的TaskTask//任务type Task struct { Id int64 Name string Ext context.Context Param *RunReq fn TaskFunc Cancel context.CancelFunc StartTime int64 EndTime int64 //日志 log Logger}type T

序本文主要研究一下xxl-job-executor-goExecutor//执行器type Executor interface { //初始化 Init(...Option) //日志查询 LogHandler(handler LogHandler) //注册任务 RegTask(pattern string, task TaskFunc) //运行任务 RunTask(writer http.ResponseWriter, request *http.Request) //杀死

序本文主要研究一下dbsync的jobsJob//Job represents db sync jobtype Job struct { ID string Error string Status string Progress Progress Items []*Transferable Chunked bool mutex *sync.Mutex StartTime time.Time EndTime *time.Time

序本文主要研究一下dbsync的SchedulableSchedulable//Schedulable represent an abstraction that can be scheduletype Schedulable struct { URL string ID string *contract.Sync Schedule *contract.Schedule Status string status uint32}//NewSchedulableFromURL

序本文主要研究一下dbsync的CriterionCriterion//Criterion represents criteriontype Criterion fmt.StringerCriterion是一个fmt.Stringer类型betweentype between struct { from int to int}func (b between) String() string { return fmt.Sprintf("BETWEEN %v AND %v",

序本文主要研究一下go.cqrs的EventHandlerEventHandlertype EventHandler interface { Handle(EventMessage)}EventHandler定义了Handle方法EventMessage// EventMessage is the interface that a command must implement.type EventMessage interface { // AggregateID returns

序本文主要研究一下go.cqrs的DispatcherDispatchertype Dispatcher interface { Dispatch(CommandMessage) error RegisterHandler(CommandHandler, ...interface{}) error}Dispatcher接口定义了Dispatch、RegisterHandler方法InMemoryDispatchertype InMemoryDispatcher struct { h

序本文主要研究一下go.cqrs的DomainRepositoryDomainRepository// DomainRepository is the interface that all domain repositories should implement.type DomainRepository interface { //Loads an aggregate of the given type and ID Load(aggregateTypeName string, aggrega

序本文主要研究一下go.cqrs的AggregateRootAggregateRoot//AggregateRoot is the interface that all aggregates should implementtype AggregateRoot interface { AggregateID() string OriginalVersion() int CurrentVersion() int IncrementVersion() Apply(events EventMes

序本文主要研究一下dkron的SchedulerScheduler// Scheduler represents a dkron scheduler instance, it stores the cron engine// and the related parameters.type Scheduler struct { Cron *cron.Cron Started bool EntryJobMap sync.Map}// NewScheduler crea

序本文主要研究一下dkron的fsmMessageType// MessageType is the type to encode FSM commands.type MessageType uint8const ( // SetJobType is the command used to store a job in the store. SetJobType MessageType = iota // DeleteJobType is the command used to delet

序本文主要研究一下machinery的LockLocktype Lock interface { //Acquire the lock with retry //key: the name of the lock, //value: at the nanosecond timestamp that lock needs to be released automatically LockWithRetries(key string, value int64) error //Acquire

序本文主要研究一下machinery的TaskStateTaskStateconst ( // StatePending - initial state of a task StatePending = "PENDING" // StateReceived - when task is received by a worker StateReceived = "RECEIVED" // StateStarted - when the worker starts processing the

序本文主要赏析一下go-ddd-sample项目结构├── _sql├── application├── config├── domain│   └── repository├── infrastructure│   └── persistence│   └── testdata└── interfaces └── testdata这里分为application、domain、infrastructure

序本文主要研究一下golang的clean architecture项目结构clean architecure[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Q4XGa2Zd-1615644923764)(https://blog.cleancoder.com/uncle-bob/images/2012-08-13-the-clean-architecture/CleanArchitecture.jpg)]clean architecture定义了四层结构，最内层是e

序本文主要研究一下dapr的PipelinePipelinedapr/pkg/middleware/http/http_pipeline.goimport ( "github.com/dapr/dapr/pkg/config" "github.com/valyala/fasthttp")type Middleware func(h fasthttp.RequestHandler) fasthttp.RequestHandler// HTTPPipeline defines the mi

序本文主要研究一下dapr的consistent hashconsistent_hashdapr/pkg/placement/hashing/consistent_hash.govar replicationFactor int// ErrNoHosts is an error for no hostsvar ErrNoHosts = errors.New("no hosts added")// ConsistentHashTables is a table holding a map o

序本文主要研究一下dapr的fswatcherfswatcherdapr/pkg/fswatcher/fswatcher.goimport ( "context" "strings" "time" "github.com/fsnotify/fsnotify" "github.com/pkg/errors")func Watch(ctx context.Context, dir string, eventCh chan<- struct{}) error { watcher,

序本文主要研究一下dapr的metrics_utilsNewMeasureViewdapr/pkg/diagnostics/utils/metrics_utils.go// NewMeasureView creates opencensus View instance using stats.Measurefunc NewMeasureView(measure stats.Measure, keys []tag.Key, aggregation *view.Aggregation) *view.V

序本文主要研究一下dapr的LimiterLimiterdapr/pkg/concurrency/limiter.goconst ( // DefaultLimit is the default concurrency limit DefaultLimit = 100)// Limiter objecttype Limiter struct { limit int tickets chan int numInProgress int32}Limi

序本文主要研究一下storagetapper的cachecachestoragetapper/pipe/cache.gotype cacheEntry struct { pipe Pipe cfg config.PipeConfig}var cache map[string]cacheEntryvar lock sync.Mutexcache是一个cacheEntry的map，cacheEntry定义了Pipe和config.PipeConfigCacheGetstorag

序本文主要研究一下storagetapper的poolThreadstoragetapper/pool/pool.gotype Thread interface { Start(m uint, f func()) Adjust(m uint) Terminate() bool NumProcs() uint}Thread接口定义了Start、Adjust、Terminate、NumProcs方法poolstoragetapper/pool/pool.go/*Create he

序本文主要研究一下storagetapper的pipePipestoragetapper/pipe/pipe.gotype Pipe interface { NewConsumer(topic string) (Consumer, error) NewProducer(topic string) (Producer, error) Type() string Config() *config.PipeConfig Close() error}Pipe接口定义了NewConsumer

序本文主要研究一下storagetapper的LockLockstoragetapper/lock/lock.go/*Lock is general distributed lock interface*/type Lock interface { // Try to acquire a lock. Returns false if failed. TryLock(s string) bool // Try to acquire a lock. Returns false if failed

序本文主要研究一下storagetapper的serverserverstoragetapper/server/server.govar server *http.Servervar mutex = sync.Mutex{}func init() { http.HandleFunc("/health", healthCheck) http.HandleFunc("/schema", schemaCmd) http.HandleFunc("/cluster", clusterInfoCmd

序本文主要研究一下nacos-coredns-plugin的UDPServerUDPServernacos-coredns-plugin/nacos/udp_server.gotype UDPServer struct { port int host string vipClient *NacosClient}UDPServer定义了port、host、vipClient属性StartServernacos-coredns-plugin/nacos/udp_server.gof

序本文主要研究一下nacos-coredns-plugin的DomainDomainnacos-coredns-plugin/nacos/nacos_domain.gotype Domain struct { Name string `json:"dom"` Clusters string CacheMillis int64 LastRefMillis int64 Instances []Instance `json:"hosts"` Env string TTL int}fu

序本文主要研究一下gost的DeltaCompareDeltaComparegost/math/compare.go// equivalent to math.Abs(expected - actual) <= deltafunc DeltaCompareFloat64(expected float64, actual float64, delta float64) bool { if expected > actual { return expected-actual <

序本文主要研究一下gost的HashSetHashSetgost/container/set/hashset.govar itemExists = struct{}{}type HashSet struct { Items map[interface{}]struct{}}func NewSet(values ...interface{}) *HashSet { set := &HashSet{Items: make(map[interface{}]struct{})} if

序本文主要研究一下gost的CountWatchCountWatchgost/time/count.gotype CountWatch struct { start time.Time}func (w *CountWatch) Start() { var t time.Time if t.Equal(w.start) { w.start = time.Now() }}func (w *CountWatch) Reset() { w.start = time.Now()}

序本文主要研究一下gost的GenericTaskPoolGenericTaskPoolgost/sync/task_pool.go// GenericTaskPool represents an generic task pool.type GenericTaskPool interface { // AddTask wait idle worker add task AddTask(t task) bool // AddTaskAlways add task to queues or d

序本文主要研究一下gost的ObjectPoolObjectPoolgost/bytes/bytes_buffer_pool.go// Pool is bytes.Buffer Pooltype ObjectPool struct { New New pool sync.Pool}func NewObjectPool(n New) *ObjectPool { return &ObjectPool{New: n}}// take returns *bytes.Buffer

序本文主要研究一下gost的PagerPagergost/hash/page/pager.go// Pager is the abstraction for pagination usage.type Pager interface { // GetOffset will return the offset GetOffset() int // GetPageSize will return the page size GetPageSize() int // GetTotalPa

序本文主要研究一下gost的GoUnterminatedGoUnterminatedgost/runtime/goroutine.go// GoUnterminated is used for which goroutine wanna long live as its process.// @period: sleep time duration after panic to defeat @handle panic so frequently. if it is not positive,/

序本文主要研究一下gost的GoSafelyGoSafelygost/runtime/goroutine.gofunc GoSafely(wg *sync.WaitGroup, ignoreRecover bool, handler func(), catchFunc func(r interface{})) { if wg != nil { wg.Add(1) } go func() { defer func() { //...... }() handler() }(