From b7c05065382d30fcf963c0b879a3c7363aae33ea Mon Sep 17 00:00:00 2001 From: Vasiliy Tolstov Date: Fri, 28 Aug 2020 12:20:52 +0300 Subject: [PATCH] initial import from go-micro Signed-off-by: Vasiliy Tolstov --- .github/ISSUE_TEMPLATE/bug_report.md | 24 + .../feature-request---enhancement.md | 17 + .github/ISSUE_TEMPLATE/question.md | 14 + .github/PULL_REQUEST_TEMPLATE.md | 9 + .github/stale.sh | 13 + .github/workflows/build.yml | 46 ++ .github/workflows/pr.yml | 46 ++ go.mod | 8 + go.sum | 420 +++++++++++++++++ registry.go | 445 ++++++++++++++++++ registry_test.go | 27 ++ table.go | 385 +++++++++++++++ table_test.go | 355 ++++++++++++++ watcher.go | 52 ++ 14 files changed, 1861 insertions(+) create mode 100644 .github/ISSUE_TEMPLATE/bug_report.md create mode 100644 .github/ISSUE_TEMPLATE/feature-request---enhancement.md create mode 100644 .github/ISSUE_TEMPLATE/question.md create mode 100644 .github/PULL_REQUEST_TEMPLATE.md create mode 100755 .github/stale.sh create mode 100644 .github/workflows/build.yml create mode 100644 .github/workflows/pr.yml create mode 100644 go.mod create mode 100644 go.sum create mode 100644 registry.go create mode 100644 registry_test.go create mode 100644 table.go create mode 100644 table_test.go create mode 100644 watcher.go diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md new file mode 100644 index 0000000..1899438 --- /dev/null +++ b/.github/ISSUE_TEMPLATE/bug_report.md @@ -0,0 +1,24 @@ +--- +name: Bug report +about: For reporting bugs in go-micro +title: "[BUG]" +labels: '' +assignees: '' + +--- + +**Describe the bug** + +1. What are you trying to do? +2. What did you expect to happen? +3. What happens instead? + +**How to reproduce the bug:** + +If possible, please include a minimal code snippet here. + +**Environment:** +Go Version: please paste `go version` output here +``` +please paste `go env` output here +``` diff --git a/.github/ISSUE_TEMPLATE/feature-request---enhancement.md b/.github/ISSUE_TEMPLATE/feature-request---enhancement.md new file mode 100644 index 0000000..459817f --- /dev/null +++ b/.github/ISSUE_TEMPLATE/feature-request---enhancement.md @@ -0,0 +1,17 @@ +--- +name: Feature request / Enhancement +about: If you have a need not served by go-micro +title: "[FEATURE]" +labels: '' +assignees: '' + +--- + +**Is your feature request related to a problem? Please describe.** +A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] + +**Describe the solution you'd like** +A clear and concise description of what you want to happen. + +**Additional context** +Add any other context or screenshots about the feature request here. diff --git a/.github/ISSUE_TEMPLATE/question.md b/.github/ISSUE_TEMPLATE/question.md new file mode 100644 index 0000000..1daf48b --- /dev/null +++ b/.github/ISSUE_TEMPLATE/question.md @@ -0,0 +1,14 @@ +--- +name: Question +about: Ask a question about go-micro +title: '' +labels: '' +assignees: '' + +--- + +Before asking, please check if your question has already been answered: + +1. Check the documentation - https://micro.mu/docs/ +2. Check the examples and plugins - https://github.com/micro/examples & https://github.com/micro/go-plugins +3. Search existing issues diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md new file mode 100644 index 0000000..cba3cbc --- /dev/null +++ b/.github/PULL_REQUEST_TEMPLATE.md @@ -0,0 +1,9 @@ +## Pull Request template +Please, go through these steps before clicking submit on this PR. + +1. Give a descriptive title to your PR. +2. Provide a description of your changes. +3. Make sure you have some relevant tests. +4. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if applicable). + +**PLEASE REMOVE THIS TEMPLATE BEFORE SUBMITTING** diff --git a/.github/stale.sh b/.github/stale.sh new file mode 100755 index 0000000..8a345c4 --- /dev/null +++ b/.github/stale.sh @@ -0,0 +1,13 @@ +#!/bin/bash -ex + +export PATH=$PATH:$(pwd)/bin +export GO111MODULE=on +export GOBIN=$(pwd)/bin + +#go get github.com/rvflash/goup@v0.4.1 + +#goup -v ./... +#go get github.com/psampaz/go-mod-outdated@v0.6.0 +go list -u -m -mod=mod -json all | go-mod-outdated -update -direct -ci || true + +#go list -u -m -json all | go-mod-outdated -update diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml new file mode 100644 index 0000000..cce94f0 --- /dev/null +++ b/.github/workflows/build.yml @@ -0,0 +1,46 @@ +name: build +on: + push: + branches: + - master +jobs: + test: + name: test + runs-on: ubuntu-latest + steps: + - name: setup + uses: actions/setup-go@v1 + with: + go-version: 1.15 + - name: checkout + uses: actions/checkout@v2 + - name: cache + uses: actions/cache@v2 + with: + path: ~/go/pkg/mod + key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }} + restore-keys: ${{ runner.os }}-go- + - name: deps + run: go get -v -t -d ./... + - name: test + env: + INTEGRATION_TESTS: yes + run: go test -mod readonly -v ./... + lint: + name: lint + runs-on: ubuntu-latest + steps: + - name: checkout + uses: actions/checkout@v2 + - name: lint + uses: golangci/golangci-lint-action@v1 + continue-on-error: true + with: + # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version. + version: v1.30 + # Optional: working directory, useful for monorepos + # working-directory: somedir + # Optional: golangci-lint command line arguments. + # args: --issues-exit-code=0 + # Optional: show only new issues if it's a pull request. The default value is `false`. + # only-new-issues: true diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml new file mode 100644 index 0000000..fd84850 --- /dev/null +++ b/.github/workflows/pr.yml @@ -0,0 +1,46 @@ +name: prbuild +on: + pull_request: + branches: + - master +jobs: + test: + name: test + runs-on: ubuntu-latest + steps: + - name: setup + uses: actions/setup-go@v1 + with: + go-version: 1.15 + - name: checkout + uses: actions/checkout@v2 + - name: cache + uses: actions/cache@v2 + with: + path: ~/go/pkg/mod + key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }} + restore-keys: ${{ runner.os }}-go- + - name: deps + run: go get -v -t -d ./... + - name: test + env: + INTEGRATION_TESTS: yes + run: go test -mod readonly -v ./... + lint: + name: lint + runs-on: ubuntu-latest + steps: + - name: checkout + uses: actions/checkout@v2 + - name: lint + uses: golangci/golangci-lint-action@v1 + continue-on-error: true + with: + # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version. + version: v1.30 + # Optional: working directory, useful for monorepos + # working-directory: somedir + # Optional: golangci-lint command line arguments. + # args: --issues-exit-code=0 + # Optional: show only new issues if it's a pull request. The default value is `false`. + # only-new-issues: true diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..936f435 --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +module github.com/unistack-org/micro-router-registry + +go 1.15 + +require ( + github.com/google/uuid v1.1.1 + github.com/unistack-org/micro/v3 v3.0.0-20200828085518-2c136b005edd +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..d96942e --- /dev/null +++ b/go.sum @@ -0,0 +1,420 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go 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+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= +rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= diff --git a/registry.go b/registry.go new file mode 100644 index 0000000..7f5d737 --- /dev/null +++ b/registry.go @@ -0,0 +1,445 @@ +package registry + +import ( + "fmt" + "strings" + "sync" + "time" + + "github.com/unistack-org/micro/v3/logger" + "github.com/unistack-org/micro/v3/registry" + "github.com/unistack-org/micro/v3/router" +) + +var ( + // RefreshInterval is the time at which we completely refresh the table + RefreshInterval = time.Second * 120 + // PruneInterval is how often we prune the routing table + PruneInterval = time.Second * 10 +) + +// rtr implements router interface +type rtr struct { + sync.RWMutex + + running bool + table *table + options router.Options + exit chan bool + initChan chan bool +} + +// NewRouter creates new router and returns it +func NewRouter(opts ...router.Option) (router.Router, error) { + // get default options + options := router.DefaultOptions() + + // apply requested options + for _, o := range opts { + o(&options) + } + + // construct the router + r := &rtr{ + options: options, + initChan: make(chan bool), + } + + if options.Registry == nil { + return nil, fmt.Errorf("registry not set") + } + + // create the new table, passing the fetchRoute method in as a fallback if + // the table doesn't contain the result for a query. + r.table = newTable(r.lookup) + + // start the router + r.start() + return r, nil +} + +// Init initializes router with given options +func (r *rtr) Init(opts ...router.Option) error { + r.Lock() + for _, o := range opts { + o(&r.options) + } + r.Unlock() + + // push a message to the init chan so the watchers + // can reset in the case the registry was changed + go func() { + r.initChan <- true + }() + + return nil +} + +// Options returns router options +func (r *rtr) Options() router.Options { + r.RLock() + defer r.RUnlock() + + options := r.options + + return options +} + +// Table returns routing table +func (r *rtr) Table() router.Table { + r.Lock() + defer r.Unlock() + return r.table +} + +func getDomain(srv *registry.Service) string { + // check the service metadata for domain + // TODO: domain as Domain field in registry? + if srv.Metadata != nil && len(srv.Metadata["domain"]) > 0 { + return srv.Metadata["domain"] + } else if len(srv.Nodes) > 0 && srv.Nodes[0].Metadata != nil { + return srv.Nodes[0].Metadata["domain"] + } + + // otherwise return wildcard + // TODO: return GlobalDomain or PublicDomain + return registry.DefaultDomain +} + +// manageRoute applies action on a given route +func (r *rtr) manageRoute(route router.Route, action string) error { + switch action { + case "create": + if err := r.table.Create(route); err != nil && err != router.ErrDuplicateRoute { + return fmt.Errorf("failed adding route for service %s: %s", route.Service, err) + } + case "delete": + if err := r.table.Delete(route); err != nil && err != router.ErrRouteNotFound { + return fmt.Errorf("failed deleting route for service %s: %s", route.Service, err) + } + case "update": + if err := r.table.Update(route); err != nil { + return fmt.Errorf("failed updating route for service %s: %s", route.Service, err) + } + default: + return fmt.Errorf("failed to manage route for service %s: unknown action %s", route.Service, action) + } + + return nil +} + +// createRoutes turns a service into a list routes basically converting nodes to routes +func (r *rtr) createRoutes(service *registry.Service, network string) []router.Route { + routes := make([]router.Route, 0, len(service.Nodes)) + + for _, node := range service.Nodes { + routes = append(routes, router.Route{ + Service: service.Name, + Address: node.Address, + Gateway: "", + Network: network, + Router: r.options.Id, + Link: router.DefaultLink, + Metric: router.DefaultLocalMetric, + Metadata: node.Metadata, + }) + } + + return routes +} + +// manageServiceRoutes applies action to all routes of the service. +// It returns error of the action fails with error. +func (r *rtr) manageRoutes(service *registry.Service, action, network string) error { + // action is the routing table action + action = strings.ToLower(action) + + // create a set of routes from the service + routes := r.createRoutes(service, network) + + // if its a delete action and there's no nodes + // it means we need to wipe out all the routes + // for that service + if action == "delete" && len(routes) == 0 { + // delete the service entirely + r.table.deleteService(service.Name, network) + return nil + } + + // create the routes in the table + for _, route := range routes { + logger.Tracef("Creating route %v domain: %v", route, network) + if err := r.manageRoute(route, action); err != nil { + return err + } + } + + return nil +} + +// manageRegistryRoutes applies action to all routes of each service found in the registry. +// It returns error if either the services failed to be listed or the routing table action fails. +func (r *rtr) loadRoutes(reg registry.Registry) error { + services, err := reg.ListServices(registry.ListDomain(registry.WildcardDomain)) + if err != nil { + return fmt.Errorf("failed listing services: %v", err) + } + + // add each service node as a separate route + for _, service := range services { + // get the services domain from metadata. Fallback to wildcard. + domain := getDomain(service) + + // create the routes + routes := r.createRoutes(service, domain) + + // if the routes exist save them + if len(routes) > 0 { + logger.Tracef("Creating routes for service %v domain: %v", service, domain) + for _, rt := range routes { + err := r.table.Create(rt) + + // update the route to prevent it from expiring + if err == router.ErrDuplicateRoute { + err = r.table.Update(rt) + } + + if err != nil { + logger.Errorf("Error creating route for service %v in domain %v: %v", service, domain, err) + } + } + continue + } + + // otherwise get all the service info + + // get the service to retrieve all its info + srvs, err := reg.GetService(service.Name, registry.GetDomain(domain)) + if err != nil { + logger.Tracef("Failed to get service %s domain: %s", service.Name, domain) + continue + } + + // manage the routes for all returned services + for _, srv := range srvs { + routes := r.createRoutes(srv, domain) + + if len(routes) > 0 { + logger.Tracef("Creating routes for service %v domain: %v", srv, domain) + for _, rt := range routes { + err := r.table.Create(rt) + + // update the route to prevent it from expiring + if err == router.ErrDuplicateRoute { + err = r.table.Update(rt) + } + + if err != nil { + logger.Errorf("Error creating route for service %v in domain %v: %v", service, domain, err) + } + } + } + } + } + + return nil +} + +// lookup retrieves all the routes for a given service and creates them in the routing table +func (r *rtr) lookup(service string) ([]router.Route, error) { + logger.Tracef("Fetching route for %s domain: %v", service, registry.WildcardDomain) + + services, err := r.options.Registry.GetService(service, registry.GetDomain(registry.WildcardDomain)) + if err == registry.ErrNotFound { + logger.Tracef("Failed to find route for %s", service) + return nil, router.ErrRouteNotFound + } else if err != nil { + logger.Tracef("Failed to find route for %s: %v", service, err) + return nil, fmt.Errorf("failed getting services: %v", err) + } + + var routes []router.Route + + for _, srv := range services { + domain := getDomain(srv) + // TODO: should we continue to send the event indicating we created a route? + // lookup is only called in the query path so probably not + routes = append(routes, r.createRoutes(srv, domain)...) + } + + return routes, nil +} + +// watchRegistry watches registry and updates routing table based on the received events. +// It returns error if either the registry watcher fails with error or if the routing table update fails. +func (r *rtr) watchRegistry(w registry.Watcher) error { + exit := make(chan bool) + + defer func() { + close(exit) + }() + + go func() { + defer w.Stop() + + select { + case <-exit: + return + case <-r.initChan: + return + case <-r.exit: + return + } + }() + + for { + // get the next service + res, err := w.Next() + if err != nil { + if err != registry.ErrWatcherStopped { + return err + } + break + } + + // don't process nil entries + if res.Service == nil { + logger.Trace("Received a nil service") + continue + } + + logger.Tracef("Router dealing with next route %s %+v\n", res.Action, res.Service) + + // get the services domain from metadata. Fallback to wildcard. + domain := getDomain(res.Service) + + // create/update or delete the route + if err := r.manageRoutes(res.Service, res.Action, domain); err != nil { + return err + } + } + + return nil +} + +// start the router. Should be called under lock. +func (r *rtr) start() error { + if r.running { + return nil + } + + if r.options.Precache { + // add all local service routes into the routing table + if err := r.loadRoutes(r.options.Registry); err != nil { + return fmt.Errorf("failed loading registry routes: %s", err) + } + } + + // add default gateway into routing table + if r.options.Gateway != "" { + // note, the only non-default value is the gateway + route := router.Route{ + Service: "*", + Address: "*", + Gateway: r.options.Gateway, + Network: "*", + Router: r.options.Id, + Link: router.DefaultLink, + Metric: router.DefaultLocalMetric, + } + if err := r.table.Create(route); err != nil { + return fmt.Errorf("failed adding default gateway route: %s", err) + } + } + + // create error and exit channels + r.exit = make(chan bool) + + // periodically refresh all the routes + go func() { + t1 := time.NewTicker(RefreshInterval) + defer t1.Stop() + + t2 := time.NewTicker(PruneInterval) + defer t2.Stop() + + for { + select { + case <-r.exit: + return + case <-t2.C: + r.table.pruneRoutes(RefreshInterval) + case <-t1.C: + if err := r.loadRoutes(r.options.Registry); err != nil { + logger.Debugf("failed refreshing registry routes: %s", err) + } + } + } + }() + + go func() { + for { + select { + case <-r.exit: + return + default: + logger.Tracef("Router starting registry watch") + w, err := r.options.Registry.Watch(registry.WatchDomain(registry.WildcardDomain)) + if err != nil { + if logger.V(logger.DebugLevel, logger.DefaultLogger) { + logger.Debugf("failed creating registry watcher: %v", err) + } + time.Sleep(time.Second) + continue + } + + // watchRegistry calls stop when it's done + if err := r.watchRegistry(w); err != nil { + if logger.V(logger.DebugLevel, logger.DefaultLogger) { + logger.Debugf("Error watching the registry: %v", err) + } + time.Sleep(time.Second) + } + } + } + }() + + r.running = true + + return nil +} + +// Lookup routes in the routing table +func (r *rtr) Lookup(q ...router.QueryOption) ([]router.Route, error) { + return r.Table().Query(q...) +} + +// Watch routes +func (r *rtr) Watch(opts ...router.WatchOption) (router.Watcher, error) { + return r.table.Watch(opts...) +} + +// Close the router +func (r *rtr) Close() error { + r.Lock() + defer r.Unlock() + + select { + case <-r.exit: + return nil + default: + if !r.running { + return nil + } + close(r.exit) + + } + + r.running = false + return nil +} + +// String prints debugging information about router +func (r *rtr) String() string { + return "registry" +} diff --git a/registry_test.go b/registry_test.go new file mode 100644 index 0000000..01a729a --- /dev/null +++ b/registry_test.go @@ -0,0 +1,27 @@ +// +build ignore + +package registry + +import ( + "os" + "testing" + + "github.com/unistack-org/micro/v3/registry/memory" + "github.com/unistack-org/micro/v3/router" +) + +func routerTestSetup() router.Router { + r := memory.NewRegistry() + return NewRouter(router.Registry(r)) +} + +func TestRouterClose(t *testing.T) { + r := routerTestSetup() + + if err := r.Close(); err != nil { + t.Errorf("failed to stop router: %v", err) + } + if len(os.Getenv("INTEGRATION_TESTS")) == 0 { + t.Logf("TestRouterStartStop STOPPED") + } +} diff --git a/table.go b/table.go new file mode 100644 index 0000000..cb4ee8b --- /dev/null +++ b/table.go @@ -0,0 +1,385 @@ +package registry + +import ( + "sync" + "time" + + "github.com/google/uuid" + "github.com/unistack-org/micro/v3/logger" + "github.com/unistack-org/micro/v3/router" +) + +// table is an in-memory routing table +type table struct { + sync.RWMutex + // lookup for a service + lookup func(string) ([]router.Route, error) + // routes stores service routes + routes map[string]map[uint64]*route + // watchers stores table watchers + watchers map[string]*tableWatcher +} + +type route struct { + route router.Route + updated time.Time +} + +// newtable creates a new routing table and returns it +func newTable(lookup func(string) ([]router.Route, error), opts ...router.Option) *table { + return &table{ + lookup: lookup, + routes: make(map[string]map[uint64]*route), + watchers: make(map[string]*tableWatcher), + } +} + +// pruneRoutes will prune routes older than the time specified +func (t *table) pruneRoutes(olderThan time.Duration) { + var routes []router.Route + + t.Lock() + + // search for all the routes + for _, routeList := range t.routes { + for _, r := range routeList { + // if any route is older than + if time.Since(r.updated).Seconds() > olderThan.Seconds() { + routes = append(routes, r.route) + } + } + } + + t.Unlock() + + // delete the routes we've found + for _, route := range routes { + t.Delete(route) + } +} + +// deleteService removes the entire service +func (t *table) deleteService(service, network string) { + t.Lock() + defer t.Unlock() + + routes, ok := t.routes[service] + if !ok { + return + } + + // delete the routes for the service + for hash, rt := range routes { + // TODO: check if this causes a problem + // with * in the network if that is a thing + // or blank strings + if rt.route.Network != network { + continue + } + delete(routes, hash) + } + + // delete the map for the service if its empty + if len(routes) == 0 { + delete(t.routes, service) + return + } + + // save the routes + t.routes[service] = routes +} + +// sendEvent sends events to all subscribed watchers +func (t *table) sendEvent(e *router.Event) { + t.RLock() + defer t.RUnlock() + + if len(e.Id) == 0 { + e.Id = uuid.New().String() + } + + for _, w := range t.watchers { + select { + case w.resChan <- e: + case <-w.done: + // don't block forever + case <-time.After(time.Second): + } + } +} + +// Create creates new route in the routing table +func (t *table) Create(r router.Route) error { + service := r.Service + sum := r.Hash() + + t.Lock() + defer t.Unlock() + + // check if there are any routes in the table for the route destination + if _, ok := t.routes[service]; !ok { + t.routes[service] = make(map[uint64]*route) + } + + // add new route to the table for the route destination + if _, ok := t.routes[service][sum]; ok { + return router.ErrDuplicateRoute + } + + // create the route + t.routes[service][sum] = &route{r, time.Now()} + + if logger.V(logger.DebugLevel, logger.DefaultLogger) { + logger.Debugf("Router emitting %s for route: %s", router.Create, r.Address) + } + + // send a route created event + go t.sendEvent(&router.Event{Type: router.Create, Timestamp: time.Now(), Route: r}) + + return nil +} + +// Delete deletes the route from the routing table +func (t *table) Delete(r router.Route) error { + service := r.Service + sum := r.Hash() + + t.Lock() + defer t.Unlock() + + if _, ok := t.routes[service]; !ok { + return router.ErrRouteNotFound + } + + if _, ok := t.routes[service][sum]; !ok { + return router.ErrRouteNotFound + } + + // delete the route from the service + delete(t.routes[service], sum) + + // delete the whole map if there are no routes left + if len(t.routes[service]) == 0 { + delete(t.routes, service) + } + + if logger.V(logger.DebugLevel, logger.DefaultLogger) { + logger.Debugf("Router emitting %s for route: %s", router.Delete, r.Address) + } + go t.sendEvent(&router.Event{Type: router.Delete, Timestamp: time.Now(), Route: r}) + + return nil +} + +// Update updates routing table with the new route +func (t *table) Update(r router.Route) error { + service := r.Service + sum := r.Hash() + + t.Lock() + defer t.Unlock() + + // check if the route destination has any routes in the table + if _, ok := t.routes[service]; !ok { + t.routes[service] = make(map[uint64]*route) + } + + if _, ok := t.routes[service][sum]; !ok { + // update the route + t.routes[service][sum] = &route{r, time.Now()} + + if logger.V(logger.DebugLevel, logger.DefaultLogger) { + logger.Debugf("Router emitting %s for route: %s", router.Update, r.Address) + } + go t.sendEvent(&router.Event{Type: router.Update, Timestamp: time.Now(), Route: r}) + return nil + } + + // just update the route, but dont emit Update event + t.routes[service][sum] = &route{r, time.Now()} + + return nil +} + +// List returns a list of all routes in the table +func (t *table) List() ([]router.Route, error) { + t.RLock() + defer t.RUnlock() + + var routes []router.Route + for _, rmap := range t.routes { + for _, route := range rmap { + routes = append(routes, route.route) + } + } + + return routes, nil +} + +// isMatch checks if the route matches given query options +func isMatch(route router.Route, address, gateway, network, rtr, link string) bool { + // matches the values provided + match := func(a, b string) bool { + if a == "*" || b == "*" || a == b { + return true + } + return false + } + + // a simple struct to hold our values + type compare struct { + a string + b string + } + + // compare the following values + values := []compare{ + {gateway, route.Gateway}, + {network, route.Network}, + {rtr, route.Router}, + {address, route.Address}, + {link, route.Link}, + } + + for _, v := range values { + // attempt to match each value + if !match(v.a, v.b) { + return false + } + } + + return true +} + +// filterRoutes finds all the routes for given network and router and returns them +func filterRoutes(routes map[uint64]*route, opts router.QueryOptions) []router.Route { + address := opts.Address + gateway := opts.Gateway + network := opts.Network + rtr := opts.Router + link := opts.Link + + // routeMap stores the routes we're going to advertise + routeMap := make(map[string][]router.Route) + + var routeCnt int + + for _, rt := range routes { + // get the actual route + route := rt.route + + if isMatch(route, address, gateway, network, rtr, link) { + // add matchihg route to the routeMap + routeKey := route.Service + "@" + route.Network + routeMap[routeKey] = append(routeMap[routeKey], route) + routeCnt++ + } + } + + results := make([]router.Route, 0, routeCnt) + for _, route := range routeMap { + results = append(results, route...) + } + + return results +} + +// Lookup queries routing table and returns all routes that match the lookup query +func (t *table) Query(q ...router.QueryOption) ([]router.Route, error) { + // create new query options + opts := router.NewQuery(q...) + + // create a cwslicelist of query results + results := make([]router.Route, 0, len(t.routes)) + + // readAndFilter routes for this service under read lock. + readAndFilter := func(q router.QueryOptions) ([]router.Route, bool) { + t.RLock() + defer t.RUnlock() + + routes, ok := t.routes[q.Service] + if !ok || len(routes) == 0 { + return nil, false + } + + return filterRoutes(routes, q), true + } + + if opts.Service != "*" { + // try and load services from the cache + if routes, ok := readAndFilter(opts); ok { + return routes, nil + } + + // lookup the route and try again + // TODO: move this logic out of the hot path + // being hammered on queries will require multiple lookups + routes, err := t.lookup(opts.Service) + if err != nil { + return nil, err + } + + // cache the routes + for _, rt := range routes { + t.Create(rt) + } + + // try again + if routes, ok := readAndFilter(opts); ok { + return routes, nil + } + + return nil, router.ErrRouteNotFound + } + + // search through all destinations + t.RLock() + + for _, routes := range t.routes { + // filter the routes + found := filterRoutes(routes, opts) + // ensure we don't append zero length routes + if len(found) == 0 { + continue + } + results = append(results, found...) + } + + t.RUnlock() + + return results, nil +} + +// Watch returns routing table entry watcher +func (t *table) Watch(opts ...router.WatchOption) (router.Watcher, error) { + // by default watch everything + wopts := router.WatchOptions{ + Service: "*", + } + + for _, o := range opts { + o(&wopts) + } + + w := &tableWatcher{ + id: uuid.New().String(), + opts: wopts, + resChan: make(chan *router.Event, 10), + done: make(chan struct{}), + } + + // when the watcher is stopped delete it + go func() { + <-w.done + t.Lock() + delete(t.watchers, w.id) + t.Unlock() + }() + + // save the watcher + t.Lock() + t.watchers[w.id] = w + t.Unlock() + + return w, nil +} diff --git a/table_test.go b/table_test.go new file mode 100644 index 0000000..db4492f --- /dev/null +++ b/table_test.go @@ -0,0 +1,355 @@ +// +build ignore + +package registry + +import ( + "fmt" + "testing" + + "github.com/unistack-org/micro/v3/router" +) + +func testSetup(t *testing.T) (*table, router.Route) { + r, err := NewRouter() + if err != nil { + t.Fatal(err) + } + routr := r.(*rtr) + + table := newTable(routr.lookup) + + route := router.Route{ + Service: "dest.svc", + Address: "dest.addr", + Gateway: "dest.gw", + Network: "dest.network", + Router: "src.router", + Link: "det.link", + Metric: 10, + } + + return table, route +} + +func TestCreate(t *testing.T) { + table, route := testSetup(t) + + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + + // adds new route for the original destination + route.Gateway = "dest.gw2" + + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + + // adding the same route under Insert policy must error + if err := table.Create(route); err != router.ErrDuplicateRoute { + t.Fatalf("error adding route. Expected error: %s, found: %s", router.ErrDuplicateRoute, err) + } +} + +func TestDelete(t *testing.T) { + table, route := testSetup(t) + + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + + // should fail to delete non-existent route + prevSvc := route.Service + route.Service = "randDest" + + if err := table.Delete(route); err != router.ErrRouteNotFound { + t.Fatalf("error deleting route. Expected: %s, found: %s", router.ErrRouteNotFound, err) + } + + // we should be able to delete the existing route + route.Service = prevSvc + + if err := table.Delete(route); err != nil { + t.Fatalf("error deleting route: %s", err) + } +} + +func TestUpdate(t *testing.T) { + table, route := testSetup(t) + + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + + // change the metric of the original route + route.Metric = 200 + + if err := table.Update(route); err != nil { + t.Fatalf("error updating route: %s", err) + } + + // this should add a new route + route.Service = "rand.dest" + + if err := table.Update(route); err != nil { + t.Fatalf("error updating route: %s", err) + } +} + +func TestList(t *testing.T) { + table, route := testSetup(t) + + svc := []string{"one.svc", "two.svc", "three.svc"} + + for i := 0; i < len(svc); i++ { + route.Service = svc[i] + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + } + + routes, err := table.List() + if err != nil { + t.Fatalf("error listing routes: %s", err) + } + + if len(routes) != len(svc) { + t.Fatalf("incorrect number of routes listed. Expected: %d, found: %d", len(svc), len(routes)) + } +} + +func TestQuery(t *testing.T) { + table, route := testSetup(t) + + svc := []string{"svc1", "svc2", "svc3", "svc1"} + net := []string{"net1", "net2", "net1", "net3"} + gw := []string{"gw1", "gw2", "gw3", "gw3"} + rtr := []string{"rtr1", "rt2", "rt3", "rtr3"} + + for i := 0; i < len(svc); i++ { + route.Service = svc[i] + route.Network = net[i] + route.Gateway = gw[i] + route.Router = rtr[i] + route.Link = router.DefaultLink + + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + } + + // return all routes + routes, err := table.Query() + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } else if len(routes) == 0 { + t.Fatalf("error looking up routes: not found") + } + + // query routes particular network + network := "net1" + + routes, err = table.Query(router.QueryNetwork(network)) + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } + + if len(routes) != 2 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 2, len(routes)) + } + + for _, route := range routes { + if route.Network != network { + t.Fatalf("incorrect route returned. Expected network: %s, found: %s", network, route.Network) + } + } + + // query routes for particular gateway + gateway := "gw1" + + routes, err = table.Query(router.QueryGateway(gateway)) + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } + + if len(routes) != 1 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 1, len(routes)) + } + + if routes[0].Gateway != gateway { + t.Fatalf("incorrect route returned. Expected gateway: %s, found: %s", gateway, routes[0].Gateway) + } + + // query routes for particular router + rt := "rtr1" + + routes, err = table.Query(router.QueryRouter(rt)) + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } + + if len(routes) != 1 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 1, len(routes)) + } + + if routes[0].Router != rt { + t.Fatalf("incorrect route returned. Expected router: %s, found: %s", rt, routes[0].Router) + } + + // query particular gateway and network + query := []router.QueryOption{ + router.QueryGateway(gateway), + router.QueryNetwork(network), + router.QueryRouter(rt), + } + + routes, err = table.Query(query...) + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } + + if len(routes) != 1 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 1, len(routes)) + } + + if routes[0].Gateway != gateway { + t.Fatalf("incorrect route returned. Expected gateway: %s, found: %s", gateway, routes[0].Gateway) + } + + if routes[0].Network != network { + t.Fatalf("incorrect network returned. Expected network: %s, found: %s", network, routes[0].Network) + } + + if routes[0].Router != rt { + t.Fatalf("incorrect route returned. Expected router: %s, found: %s", rt, routes[0].Router) + } + + // non-existen route query + routes, err = table.Query(router.QueryService("foobar")) + if err != router.ErrRouteNotFound { + t.Fatalf("error looking up routes. Expected: %s, found: %s", router.ErrRouteNotFound, err) + } + + if len(routes) != 0 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 0, len(routes)) + } + + // query NO routes + query = []router.QueryOption{ + router.QueryGateway(gateway), + router.QueryNetwork(network), + router.QueryLink("network"), + } + + routes, err = table.Query(query...) + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } + + if len(routes) > 0 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 0, len(routes)) + } + + // insert local routes to query + for i := 0; i < 2; i++ { + route.Link = "foobar" + route.Address = fmt.Sprintf("local.route.address-%d", i) + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + } + + // query local routes + query = []router.QueryOption{ + router.QueryGateway("*"), + router.QueryNetwork("*"), + router.QueryLink("foobar"), + } + + routes, err = table.Query(query...) + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } + + if len(routes) != 2 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 2, len(routes)) + } + + // add two different routes for svcX with different metric + for i := 0; i < 2; i++ { + route.Service = "svcX" + route.Address = fmt.Sprintf("svcX.route.address-%d", i) + route.Metric = int64(100 + i) + route.Link = router.DefaultLink + if err := table.Create(route); err != nil { + t.Fatalf("error adding route: %s", err) + } + } + + query = []router.QueryOption{ + router.QueryService("svcX"), + } + + routes, err = table.Query(query...) + if err != nil { + t.Fatalf("error looking up routes: %s", err) + } + + if len(routes) != 2 { + t.Fatalf("incorrect number of routes returned. Expected: %d, found: %d", 1, len(routes)) + } +} + +func TestFallback(t *testing.T) { + + r := &rtr{ + options: router.DefaultOptions(), + } + route := router.Route{ + Service: "go.micro.service.foo", + Router: r.options.Id, + Link: router.DefaultLink, + Metric: router.DefaultLocalMetric, + } + r.table = newTable(func(s string) ([]router.Route, error) { + return []router.Route{route}, nil + }) + r.start() + + rts, err := r.Lookup(router.QueryService("go.micro.service.foo")) + if err != nil { + t.Fatalf("error looking up service %s", err) + } + if len(rts) != 1 { + t.Fatalf("incorrect number of routes returned %d", len(rts)) + } + + // deleting from the table but the next query should invoke the fallback that we passed during new table creation + if err := r.table.Delete(route); err != nil { + t.Fatalf("error deleting route %s", err) + } + + rts, err = r.Lookup(router.QueryService("go.micro.service.foo")) + if err != nil { + t.Fatalf("error looking up service %s", err) + } + if len(rts) != 1 { + t.Fatalf("incorrect number of routes returned %d", len(rts)) + } + +} + +func TestFallbackError(t *testing.T) { + r := &rtr{ + options: router.DefaultOptions(), + } + r.table = newTable(func(s string) ([]router.Route, error) { + return nil, fmt.Errorf("ERROR") + }) + r.start() + _, err := r.Lookup(router.QueryService("go.micro.service.foo")) + if err == nil { + t.Fatalf("expected error looking up service but none returned") + } + +} diff --git a/watcher.go b/watcher.go new file mode 100644 index 0000000..63e0f43 --- /dev/null +++ b/watcher.go @@ -0,0 +1,52 @@ +package registry + +import ( + "sync" + + "github.com/unistack-org/micro/v3/router" +) + +// tableWatcher implements routing table Watcher +type tableWatcher struct { + sync.RWMutex + id string + opts router.WatchOptions + resChan chan *router.Event + done chan struct{} +} + +// Next returns the next noticed action taken on table +// TODO: right now we only allow to watch particular service +func (w *tableWatcher) Next() (*router.Event, error) { + for { + select { + case res := <-w.resChan: + switch w.opts.Service { + case res.Route.Service, "*": + return res, nil + default: + continue + } + case <-w.done: + return nil, router.ErrWatcherStopped + } + } +} + +// Chan returns watcher events channel +func (w *tableWatcher) Chan() (<-chan *router.Event, error) { + return w.resChan, nil +} + +// Stop stops routing table watcher +func (w *tableWatcher) Stop() { + w.Lock() + defer w.Unlock() + + select { + case <-w.done: + return + default: + close(w.done) + } +}