From f299727847bf6f82bbf5d60f8a5f79147aa04608 Mon Sep 17 00:00:00 2001 From: Johnny Steenbergen Date: Sat, 13 Jan 2024 21:35:52 -0600 Subject: [PATCH] chore(allsrv): add database observer for DB metrics Often times, metrics and tracing are left out, leaving the service owners blind. When we add metrics, with defined patterns, we're able to build out robust metrics and tracing dashboards. Additionally, with the observer we get a warning from the compiler that we forgot to add observability concerns for any new behavior/method added to the database(s). Now, how about adding opentracing spans to the observer? --- allsrv/observe_db.go | 62 +++++++++++++++++++++++++ allsrv/server.go | 3 ++ allsrv/server_test.go | 18 ++++++-- go.mod | 6 +++ go.sum | 104 +++++++++++++++++++++++++++++++++++++++++- 5 files changed, 188 insertions(+), 5 deletions(-) create mode 100644 allsrv/observe_db.go diff --git a/allsrv/observe_db.go b/allsrv/observe_db.go new file mode 100644 index 0000000..1ea2be8 --- /dev/null +++ b/allsrv/observe_db.go @@ -0,0 +1,62 @@ +package allsrv + +import ( + "time" + + "github.com/hashicorp/go-metrics" +) + +const ( + metricsPrefix = "mess" +) + +// ObserveDB provides observability to the database. +func ObserveDB(name string, met *metrics.Metrics) func(DB) DB { + return func(next DB) DB { + return &dbMW{ + name: name, + next: next, + met: met, + } + } +} + +type dbMW struct { + name string + next DB + met *metrics.Metrics +} + +func (d *dbMW) CreateFoo(f Foo) error { + rec := d.record("create") + return rec(d.next.CreateFoo(f)) +} + +func (d *dbMW) ReadFoo(id string) (Foo, error) { + rec := d.record("read") + f, err := d.next.ReadFoo(id) + return f, rec(err) +} + +func (d *dbMW) UpdateFoo(f Foo) error { + rec := d.record("update") + return rec(d.next.UpdateFoo(f)) +} + +func (d *dbMW) DelFoo(id string) error { + rec := d.record("delete") + return rec(d.next.DelFoo(id)) +} + +func (d *dbMW) record(op string) func(error) error { + start := time.Now() + name := []string{metricsPrefix, d.name, op} + d.met.IncrCounter(append(name, "reqs"), 1) + return func(err error) error { + if err != nil { + d.met.IncrCounter(append(name, "errs"), 1) + } + d.met.MeasureSince(append(name, "dur"), start) + return err + } +} diff --git a/allsrv/server.go b/allsrv/server.go index a36fff7..c6bc612 100644 --- a/allsrv/server.go +++ b/allsrv/server.go @@ -33,6 +33,9 @@ import ( a) there is nothing actionable, so how does the consumer know to handle the error? b) if the APIs evolve, how does the consumer distinguish between old and new? 10) Observability.... + a) metrics + b) logging + c) tracing ✅11) hard coding UUID generation into db 12) possible race conditions in inmem store ✅13) there is a bug in the delete foo inmem db implementation diff --git a/allsrv/server_test.go b/allsrv/server_test.go index 9a7a035..470f6d7 100644 --- a/allsrv/server_test.go +++ b/allsrv/server_test.go @@ -8,6 +8,7 @@ import ( "net/http/httptest" "testing" + "github.com/hashicorp/go-metrics" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" @@ -17,7 +18,7 @@ import ( func TestServer(t *testing.T) { t.Run("foo create", func(t *testing.T) { t.Run("when provided a valid foo should pass", func(t *testing.T) { - db := new(allsrv.InmemDB) + db := allsrv.ObserveDB("inmem", newTestMetrics(t))(new(allsrv.InmemDB)) svr := allsrv.NewServer(db, allsrv.WithBasicAuth("dodgers@stink.com", "PaSsWoRd"), allsrv.WithIDFn(func() string { @@ -63,7 +64,7 @@ func TestServer(t *testing.T) { t.Run("foo read", func(t *testing.T) { t.Run("when querying for existing foo id should pass", func(t *testing.T) { - db := new(allsrv.InmemDB) + db := allsrv.ObserveDB("inmem", newTestMetrics(t))(new(allsrv.InmemDB)) err := db.CreateFoo(allsrv.Foo{ ID: "reader1", Name: "read", @@ -105,7 +106,7 @@ func TestServer(t *testing.T) { t.Run("foo update", func(t *testing.T) { t.Run("when updating an existing foo with valid changes should pass", func(t *testing.T) { - db := new(allsrv.InmemDB) + db := allsrv.ObserveDB("inmem", newTestMetrics(t))(new(allsrv.InmemDB)) err := db.CreateFoo(allsrv.Foo{ ID: "id1", Name: "first_name", @@ -156,7 +157,7 @@ func TestServer(t *testing.T) { t.Run("foo delete", func(t *testing.T) { t.Run("when deleting an existing foo should pass", func(t *testing.T) { - db := new(allsrv.InmemDB) + db := allsrv.ObserveDB("inmem", newTestMetrics(t))(new(allsrv.InmemDB)) err := db.CreateFoo(allsrv.Foo{ ID: "id1", Name: "first_name", @@ -208,3 +209,12 @@ func expectJSONBody[T any](t *testing.T, r io.Reader, assertFn func(t *testing.T assertFn(t, out) } + +func newTestMetrics(t *testing.T) *metrics.Metrics { + t.Helper() + + met, err := metrics.New(&metrics.Config{}, &metrics.BlackholeSink{}) + require.NoError(t, err) + + return met +} diff --git a/go.mod b/go.mod index 7b40841..8ea2ae1 100644 --- a/go.mod +++ b/go.mod @@ -4,11 +4,17 @@ go 1.22 require ( github.com/gofrs/uuid v4.4.0+incompatible + github.com/hashicorp/go-metrics v0.5.3 github.com/stretchr/testify v1.8.4 ) require ( github.com/davecgh/go-spew v1.1.1 // indirect + github.com/hashicorp/go-immutable-radix v1.0.0 // indirect + github.com/hashicorp/golang-lru v0.5.0 // indirect + github.com/kr/pretty v0.3.1 // indirect github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/rogpeppe/go-internal v1.10.0 // indirect + gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect gopkg.in/yaml.v3 v3.0.1 // indirect ) diff --git a/go.sum b/go.sum index f8b8f5e..3e87732 100644 --- a/go.sum +++ 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