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feat: add Datadog continuous profiler gated by DD_PROFILING_ENABLED #296

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Merged
worstell merged 1 commit into from
May 6, 2026
Merged

feat: add Datadog continuous profiler gated by DD_PROFILING_ENABLED #296

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11 changes: 11 additions & 0 deletions cmd/cachewd/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ import (
"github.com/block/cachew/internal/metadatadb"
"github.com/block/cachew/internal/metrics"
"github.com/block/cachew/internal/opa"
"github.com/block/cachew/internal/profiling"
"github.com/block/cachew/internal/reaper"
"github.com/block/cachew/internal/s3client"
"github.com/block/cachew/internal/strategy"
Expand All @@ -52,6 +53,8 @@ type CLI struct {
Schema bool `help:"Print the configuration file schema." xor:"command"`

Config *os.File `hcl:"-" help:"Configuration file path." required:"" default:"cachew.hcl"`

DDProfilingEnabled bool `help:"Enable the Datadog continuous profiler." env:"DD_PROFILING_ENABLED"`
}

func main() {
Expand All @@ -70,6 +73,14 @@ func main() {
ctx := context.Background()
logger, ctx := logging.Configure(ctx, globalConfig.LoggingConfig)

// Start the Datadog continuous profiler when enabled. The DD_*
// env vars (DD_AGENT_HOST/SERVICE/ENV/VERSION) are read by the
// dd-trace-go library directly and are wired in by the deployment
// manifest.
stopProfiler, err := profiling.Start(ctx, cli.DDProfilingEnabled)
fatalIfError(ctx, logger, err, "Failed to start Datadog profiler")
defer stopProfiler()

reaper.Start(ctx)

// Start initialising
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13 changes: 13 additions & 0 deletions go.mod
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Expand Up @@ -22,9 +22,16 @@ require (
go.opentelemetry.io/otel/sdk/metric v1.43.0
golang.org/x/mod v0.35.0
golang.org/x/sync v0.20.0
gopkg.in/DataDog/dd-trace-go.v1 v1.74.8
)

require (
github.com/DataDog/datadog-agent/pkg/trace v0.67.0 // indirect
github.com/DataDog/datadog-go/v5 v5.6.0 // indirect
github.com/DataDog/dd-trace-go/v2 v2.3.0 // indirect
github.com/DataDog/gostackparse v0.7.0 // indirect
github.com/Masterminds/semver/v3 v3.3.1 // indirect
github.com/Microsoft/go-winio v0.6.2 // indirect
github.com/agnivade/levenshtein v1.2.1 // indirect
github.com/aofei/backoff v1.2.0 // indirect
github.com/beorn7/perks v1.0.1 // indirect
Expand All @@ -39,6 +46,7 @@ require (
github.com/go-logr/stdr v1.2.2 // indirect
github.com/gobwas/glob v0.2.3 // indirect
github.com/goccy/go-json v0.10.5 // indirect
github.com/google/pprof v0.0.0-20250403155104-27863c87afa6 // indirect
github.com/google/uuid v1.6.0 // indirect
github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
github.com/hexops/gotextdiff v1.0.3 // indirect
Expand All @@ -60,10 +68,13 @@ require (
github.com/prometheus/common v0.67.5 // indirect
github.com/prometheus/otlptranslator v1.0.0 // indirect
github.com/prometheus/procfs v0.20.1 // indirect
github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect
github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9 // indirect
github.com/richardartoul/molecule v1.0.1-0.20240531184615-7ca0df43c0b3 // indirect
github.com/rs/xid v1.6.0 // indirect
github.com/segmentio/asm v1.2.1 // indirect
github.com/sirupsen/logrus v1.9.4 // indirect
github.com/spaolacci/murmur3 v1.1.0 // indirect
github.com/tchap/go-patricia/v2 v2.3.3 // indirect
github.com/tinylib/msgp v1.6.1 // indirect
github.com/valyala/fastjson v1.6.7 // indirect
Expand All @@ -80,10 +91,12 @@ require (
golang.org/x/net v0.52.0 // indirect
golang.org/x/sys v0.42.0 // indirect
golang.org/x/text v0.35.0 // indirect
golang.org/x/time v0.15.0 // indirect
google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9 // indirect
google.golang.org/grpc v1.80.0 // indirect
google.golang.org/protobuf v1.36.11 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
sigs.k8s.io/yaml v1.6.0 // indirect
)

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