From 7b208e9cb5d510418111e2abe220e1023410e37d Mon Sep 17 00:00:00 2001 From: Casey Buto Date: Sun, 30 Jul 2023 18:20:06 -0400 Subject: [PATCH] initial commit (#1) --- .gitignore | 3 + .goreleaser.yaml | 36 ++++ .tool-versions | 1 + README.md | 33 +++ cmd/pprof/pprof.go | 195 +++++++++++++++++ cmd/root.go | 20 ++ go.mod | 69 ++++++ go.sum | 255 +++++++++++++++++++++++ internal/portforward/portforward.go | 134 ++++++++++++ internal/portforward/portforward_test.go | 56 +++++ internal/pprofgetter/pprofgetter.go | 84 ++++++++ internal/pprofgetter/pprofgetter_test.go | 116 +++++++++++ 12 files changed, 1002 insertions(+) create mode 100644 .gitignore create mode 100644 .goreleaser.yaml create mode 100644 .tool-versions create mode 100644 README.md create mode 100644 cmd/pprof/pprof.go create mode 100644 cmd/root.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 internal/portforward/portforward.go create mode 100644 internal/portforward/portforward_test.go create mode 100644 internal/pprofgetter/pprofgetter.go create mode 100644 internal/pprofgetter/pprofgetter_test.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..681d7ea --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +.idea/ + +dist/ diff --git a/.goreleaser.yaml b/.goreleaser.yaml new file mode 100644 index 0000000..e628382 --- /dev/null +++ b/.goreleaser.yaml @@ -0,0 +1,36 @@ +before: + hooks: + - go mod tidy +builds: + - main: ./cmd/ + env: + - CGO_ENABLED=0 + goos: + - linux + - windows + - darwin + +archives: + - format: tar.gz + # this name template makes the OS and Arch compatible with the results of uname. + name_template: >- + {{ .ProjectName }}_ + {{- title .Os }}_ + {{- if eq .Arch "amd64" }}x86_64 + {{- else if eq .Arch "386" }}i386 + {{- else }}{{ .Arch }}{{ end }} + {{- if .Arm }}v{{ .Arm }}{{ end }} + # use zip for windows archives + format_overrides: + - goos: windows + format: zip +checksum: + name_template: 'checksums.txt' +snapshot: + name_template: "{{ incpatch .Version }}-next" +changelog: + sort: asc + filters: + exclude: + - '^docs:' + - '^test:' diff --git a/.tool-versions b/.tool-versions new file mode 100644 index 0000000..f3ab914 --- /dev/null +++ b/.tool-versions @@ -0,0 +1 @@ +golang 1.20 diff --git a/README.md b/README.md new file mode 100644 index 0000000..c986f27 --- /dev/null +++ b/README.md @@ -0,0 +1,33 @@ +# kubectl pprof plugin + +A simple kubectl plugin to collect Go pprof profiles from pods that +expose the ["net/http/pprof"](https://pkg.go.dev/net/http/pprof) endpoints on a local port. + +The plugin will port-forward to the specified pod and write the pprof profile to the filesystem +to be analyze with `go tool pprof`. + +## Installing + +1. Download the binary from the GH release +2. Move the `kubectl-pprof` binary to anywhere in your `$PATH` +3. Run `kubectl pprof -h` to validate the plugin is working + +## Example usage + +### Collecting a CPU profile + +```bash +kubectl pprof --port 8080 -n --profile cpu +``` + +### Collecting a heap profile for 30 seconds + +```bash +kubectl pprof --port 8080 -n --profile heap --seconds 30 --output /tmp/ +``` + +### Pass a profile directly to `go tool pprof` (suppress output with `-q`) + +```bash +kubectl pprof --port 8080 -n --profile cpu -q | xargs go tool pprof -http=:8080 +``` diff --git a/cmd/pprof/pprof.go b/cmd/pprof/pprof.go new file mode 100644 index 0000000..79060a1 --- /dev/null +++ b/cmd/pprof/pprof.go @@ -0,0 +1,195 @@ +package pprof + +import ( + "context" + "fmt" + "net/url" + "os" + "path" + "runtime/pprof" + "time" + + "github.com/spf13/cobra" + "k8s.io/cli-runtime/pkg/genericclioptions" + "k8s.io/cli-runtime/pkg/genericiooptions" + "k8s.io/client-go/rest" + + "github.com/cbuto/kubectl-pprof/internal/portforward" + "github.com/cbuto/kubectl-pprof/internal/pprofgetter" +) + +var pprofExample = ` + # collect a heap profile a pod + %[1]s pprof --profile heap --seconds 10 + + # collect a cpu profile and output profile to /tmp/ + %[1]s pprof --port 8080 -n --profile cpu --output /tmp/ --seconds 30 + + # pass a profile directly to go tool pprof (suppress output with -q) + %[1]s pprof --port 8080 -n --profile cpu -q | xargs go tool pprof -http=:8080 + +` + +const ( + DefaultProfileSeconds = 10 + DefaultPProfPort = 8080 +) + +type pprofCmdOptions struct { + genericiooptions.IOStreams + restConfig *rest.Config + configFlags *genericclioptions.ConfigFlags + profile string + seconds int + port int + outDir string + namespace string + pod string + quiet bool +} + +func newPProfOptions(streams genericiooptions.IOStreams) *pprofCmdOptions { + return &pprofCmdOptions{ + configFlags: genericclioptions.NewConfigFlags(true), + IOStreams: streams, + } +} + +func NewPProfCmd(streams genericiooptions.IOStreams) *cobra.Command { + opts := newPProfOptions(streams) + + cmd := &cobra.Command{ + Use: "pprof [pod] [flags]", + Short: "Collects the specified pprof profile from a pod", + Example: fmt.Sprintf(pprofExample, "kubectl"), + SilenceUsage: true, + RunE: func(c *cobra.Command, args []string) error { + if err := opts.Complete(c, args); err != nil { + return err + } + if err := opts.Validate(); err != nil { + return err + } + if err := opts.Run(); err != nil { + return err + } + + return nil + }, + } + + cmd.Flags().BoolVarP(&opts.quiet, "quiet", "q", false, "suppresses output and only prints the output file") + cmd.Flags().StringVar(&opts.profile, + "profile", + "cpu", "type of profile to collect (heap, cpu, block, goroutine, mutex, or threadcreate)") + cmd.Flags().StringVar(&opts.outDir, "output", "./", "path to a directory to write the profile") + cmd.Flags().IntVar(&opts.seconds, "seconds", DefaultProfileSeconds, "amount of seconds to collect the profile") + cmd.Flags().IntVar(&opts.port, "port", DefaultPProfPort, "pprof port") + + opts.configFlags.AddFlags(cmd.Flags()) + + return cmd +} + +func (o *pprofCmdOptions) Complete(cmd *cobra.Command, args []string) error { + var err error + o.namespace, _, err = o.configFlags.ToRawKubeConfigLoader().Namespace() + + if err != nil { + return fmt.Errorf("failed to get namespace from config: %w", err) + } + + if len(args) != 1 { + return fmt.Errorf("invalid number of arguments, use --help to see example usage") + } + + o.pod = args[0] + o.restConfig, err = o.configFlags.ToRESTConfig() + + if err != nil { + return fmt.Errorf("failed to get REST config: %w", err) + } + + return nil +} + +func (o *pprofCmdOptions) Validate() error { + if o.profile == "" { + return fmt.Errorf("must select type of profile to collect") + } + + if o.profile != "cpu" { + profile := pprof.Lookup(o.profile) + if profile == nil { + return fmt.Errorf("unknown profile: %s", o.profile) + } + } + + fileInfo, err := os.Stat(o.outDir) + + if err != nil { + return fmt.Errorf("failed to check if --output is a dir: %w", err) + } + + if !fileInfo.IsDir() { + return fmt.Errorf("--output flag must be set to a directory: %s", o.outDir) + } + + return nil +} + +func (o *pprofCmdOptions) Run() error { + var err error + + ctx := context.TODO() + + out, errOut := o.IOStreams.Out, o.IOStreams.ErrOut + if o.quiet { + out, errOut = nil, nil + } + + portforwarder, err := portforward.NewPortForward( + portforward.WithRESTConfig(o.restConfig), + portforward.WithOutput(out, errOut)) + if err != nil { + return fmt.Errorf("failed to get port-forwarder: %w", err) + } + + localPort, stopCh, err := portforwarder.PortForward(ctx, o.namespace, o.pod, o.port) + + if err != nil { + return fmt.Errorf("port-forwarding failed: %w", err) + } + + defer close(stopCh) + + if !o.quiet { + _, err = o.IOStreams.Out.Write([]byte(fmt.Sprintf("collecting profile from %s (for %d secs)...\n", o.pod, o.seconds))) + if err != nil { + return fmt.Errorf("failed to write to output: %w", err) + } + } + + outFilePath := path.Join(o.outDir, fmt.Sprintf("%s_%s_%d.out", o.pod, o.profile, time.Now().Unix())) + pprofHostURL := &url.URL{ + Scheme: "http", + Host: fmt.Sprintf("localhost:%d", localPort), + } + + getter, err := pprofgetter.NewPProfGetter(pprofgetter.WithHostURL(pprofHostURL)) + if err != nil { + return fmt.Errorf("failed to build pprof getter: %w", err) + } + + err = getter.Get(ctx, o.profile, o.seconds, outFilePath) + if err != nil { + return fmt.Errorf("failed to collect profile: %w", err) + } + + _, err = o.IOStreams.Out.Write([]byte(fmt.Sprintf("%s\n", outFilePath))) + if err != nil { + return fmt.Errorf("failed to output profile filename: %w", err) + } + + return nil +} diff --git a/cmd/root.go b/cmd/root.go new file mode 100644 index 0000000..8a414bd --- /dev/null +++ b/cmd/root.go @@ -0,0 +1,20 @@ +package main + +import ( + "os" + + "github.com/cbuto/kubectl-pprof/cmd/pprof" + + "github.com/spf13/pflag" + "k8s.io/cli-runtime/pkg/genericiooptions" +) + +func main() { + flags := pflag.NewFlagSet("kubectl-pprof", pflag.ExitOnError) + pflag.CommandLine = flags + + root := pprof.NewPProfCmd(genericiooptions.IOStreams{In: os.Stdin, Out: os.Stdout, ErrOut: os.Stderr}) + if err := root.Execute(); err != nil { + os.Exit(1) + } +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..d3286c0 --- /dev/null +++ b/go.mod @@ -0,0 +1,69 @@ +module github.com/cbuto/kubectl-pprof + +go 1.20 + +require ( + github.com/spf13/cobra v1.7.0 + github.com/spf13/pflag v1.0.5 + github.com/stretchr/testify v1.8.2 + k8s.io/cli-runtime v0.0.0-20230718062906-448da40f6f16 + k8s.io/client-go v0.0.0-20230718055620-74c18d3a4044 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.9.0 // indirect + github.com/evanphx/json-patch v5.6.0+incompatible // indirect + github.com/go-errors/errors v1.4.2 // indirect + github.com/go-logr/logr v1.2.4 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/btree v1.0.1 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/go-cmp v0.5.9 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/inconshreveable/mousetrap v1.1.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/moby/spdystream v0.2.0 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/peterbourgon/diskv v2.0.1+incompatible // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/xlab/treeprint v1.2.0 // indirect + go.starlark.net v0.0.0-20230525235612-a134d8f9ddca // indirect + golang.org/x/net v0.12.0 // indirect + golang.org/x/oauth2 v0.8.0 // indirect + golang.org/x/sync v0.2.0 // indirect + golang.org/x/sys v0.10.0 // indirect + golang.org/x/term v0.10.0 // indirect + golang.org/x/text v0.11.0 // indirect + golang.org/x/time v0.3.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.30.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/api v0.0.0-20230718054858-1b0ec3bb3296 // indirect + k8s.io/apimachinery v0.0.0-20230718054246-5cb236977966 // indirect + k8s.io/klog/v2 v2.100.1 // indirect + k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9 // indirect + k8s.io/utils v0.0.0-20230406110748-d93618cff8a2 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/kustomize/api v0.13.5-0.20230601165947-6ce0bf390ce3 // indirect + sigs.k8s.io/kustomize/kyaml v0.14.3-0.20230601165947-6ce0bf390ce3 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..31bdd07 --- /dev/null +++ b/go.sum @@ -0,0 +1,255 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= +github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI= +github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/emicklei/go-restful/v3 v3.9.0 h1:XwGDlfxEnQZzuopoqxwSEllNcCOM9DhhFyhFIIGKwxE= +github.com/emicklei/go-restful/v3 v3.9.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= +github.com/evanphx/json-patch v5.6.0+incompatible h1:jBYDEEiFBPxA0v50tFdvOzQQTCvpL6mnFh5mB2/l16U= +github.com/evanphx/json-patch v5.6.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk= +github.com/go-errors/errors v1.4.2 h1:J6MZopCL4uSllY1OfXM374weqZFFItUbrImctkmUxIA= +github.com/go-errors/errors v1.4.2/go.mod h1:sIVyrIiJhuEF+Pj9Ebtd6P/rEYROXFi3BopGUQ5a5Og= +github.com/go-logr/logr v1.2.0/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ= +github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE= +github.com/go-openapi/jsonpointer v0.19.6/go.mod h1:osyAmYz/mB/C3I+WsTTSgw1ONzaLJoLCyoi6/zppojs= +github.com/go-openapi/jsonreference v0.20.2 h1:3sVjiK66+uXK/6oQ8xgcRKcFgQ5KXa2KvnJRumpMGbE= +github.com/go-openapi/jsonreference v0.20.2/go.mod h1:Bl1zwGIM8/wsvqjsOQLJ/SH+En5Ap4rVB5KVcIDZG2k= +github.com/go-openapi/swag v0.22.3 h1:yMBqmnQ0gyZvEb/+KzuWZOXgllrXT4SADYbvDaXHv/g= +github.com/go-openapi/swag v0.22.3/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+VcZ0yl14= +github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI= +github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q= +github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q= +github.com/golang/glog 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+ "fmt" + "io" + "net" + "net/http" + "net/url" + "path" + + "k8s.io/client-go/rest" + "k8s.io/client-go/tools/portforward" + "k8s.io/client-go/transport/spdy" +) + +type PortForwarderOption func(forwarder *PortForwarder) + +type PortForwarder struct { + host string + restConfig *rest.Config + out io.Writer + errOut io.Writer +} + +func NewPortForward(options ...PortForwarderOption) (*PortForwarder, error) { + portForwarder := &PortForwarder{} + for _, opt := range options { + opt(portForwarder) + } + + if portForwarder.restConfig == nil { + return nil, fmt.Errorf("RESTConfig cannot be nil") + } + + portForwarder.host = portForwarder.restConfig.Host + + return portForwarder, nil +} + +func WithRESTConfig(restConfig *rest.Config) PortForwarderOption { + return func(forwarder *PortForwarder) { + forwarder.restConfig = restConfig + } +} + +func WithOutput(out io.Writer, errOut io.Writer) PortForwarderOption { + return func(forwarder *PortForwarder) { + forwarder.out = out + forwarder.errOut = errOut + } +} + +func (f *PortForwarder) PortForward( + ctx context.Context, + namespace, + pod string, + port int, +) (int, chan struct{}, error) { + var localPort int + + var readyCh chan struct{} + + stopCh, readyCh, errCh := make(chan struct{}, 1), make(chan struct{}, 1), make(chan error) + + roundTripper, upgrader, err := spdy.RoundTripperFor(f.restConfig) + if err != nil { + return localPort, nil, fmt.Errorf("failed to get round tripper: %w", err) + } + + hostURL, err := url.Parse(f.restConfig.Host) + if err != nil { + return localPort, nil, fmt.Errorf("parsing host from RESTConfig failed: %w", err) + } + + portForwardURL := &url.URL{ + Scheme: "https", + Path: path.Join( + hostURL.Path, + "api/v1/namespaces", + url.PathEscape(namespace), + "pods", + url.PathEscape(pod), + "portforward", + ), + Host: hostURL.Host, + } + + dialer := spdy.NewDialer(upgrader, &http.Client{Transport: roundTripper}, http.MethodPost, portForwardURL) + + localPort, err = getFreePort() + if err != nil { + return localPort, nil, fmt.Errorf("failed to find free port on host: %w", err) + } + + ports := []string{fmt.Sprintf("%d:%d", localPort, port)} + portforwarder, err := portforward.New(dialer, ports, stopCh, readyCh, f.out, f.errOut) + + if err != nil { + return localPort, nil, fmt.Errorf("failed to get port-forwarder: %w", err) + } + + go func() { + if err := portforwarder.ForwardPorts(); err != nil { + errCh <- err + } + + close(errCh) + }() + + select { + case <-readyCh: + case err = <-errCh: + if err != nil { + return localPort, nil, fmt.Errorf("port-forward failed: %w", err) + } + } + + return localPort, stopCh, nil +} + +func getFreePort() (int, error) { + var port int + + listener, err := net.Listen("tcp", ":0") + if err != nil { + return port, err + } + defer listener.Close() + + port = listener.Addr().(*net.TCPAddr).Port + + return port, nil +} diff --git a/internal/portforward/portforward_test.go b/internal/portforward/portforward_test.go new file mode 100644 index 0000000..c5eae0c --- /dev/null +++ b/internal/portforward/portforward_test.go @@ -0,0 +1,56 @@ +package portforward + +import ( + "io" + "reflect" + "testing" + + "k8s.io/client-go/rest" +) + +func TestNewPortForward(t *testing.T) { + host := "foo" + fakeRestConfig := &rest.Config{ + Host: host, + } + fakeOutput := io.Discard + tests := []struct { + name string + options []PortForwarderOption + want *PortForwarder + wantErr bool + }{ + { + name: "no restconfig", + options: []PortForwarderOption{}, + want: nil, + wantErr: true, + }, + { + name: "with restconfig", + options: []PortForwarderOption{WithRESTConfig(fakeRestConfig)}, + want: &PortForwarder{host: host, restConfig: fakeRestConfig}, + wantErr: false, + }, + { + name: "with output", + options: []PortForwarderOption{WithRESTConfig(fakeRestConfig), WithOutput(fakeOutput, fakeOutput)}, + want: &PortForwarder{host: host, restConfig: fakeRestConfig, errOut: fakeOutput, out: fakeOutput}, + wantErr: false, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + got, err := NewPortForward(tt.options...) + + if (err != nil) != tt.wantErr { + t.Errorf("NewPortForward() error = %v, wantErr %v", err, tt.wantErr) + + return + } + if !reflect.DeepEqual(got, tt.want) { + t.Errorf("NewPortForward() got = %v, want %v", got, tt.want) + } + }) + } +} diff --git a/internal/pprofgetter/pprofgetter.go b/internal/pprofgetter/pprofgetter.go new file mode 100644 index 0000000..fc40574 --- /dev/null +++ b/internal/pprofgetter/pprofgetter.go @@ -0,0 +1,84 @@ +package pprofgetter + +import ( + "context" + "errors" + "fmt" + "io" + "net/http" + "net/url" + "os" +) + +const CPUProfileName = "cpu" + +var ErrPProfEndpointFailed = errors.New("pprof endpoint failed") + +type PProfGetter struct { + hostURL *url.URL +} + +type Option func(getter *PProfGetter) + +func WithHostURL(hostURL *url.URL) Option { + return func(getter *PProfGetter) { + getter.hostURL = hostURL + } +} + +func NewPProfGetter(options ...Option) (*PProfGetter, error) { + pprofGetter := &PProfGetter{} + for _, opt := range options { + opt(pprofGetter) + } + + if pprofGetter.hostURL == nil { + return nil, fmt.Errorf("url cannot be nil") + } + + return pprofGetter, nil +} + +func (p *PProfGetter) Get(ctx context.Context, profile string, seconds int, outFilePath string) error { + var profilePath string + + profilePath = fmt.Sprintf("/debug/pprof/%s", profile) + if profile == CPUProfileName { + profilePath = "/debug/pprof/profile" + } + + p.hostURL.RawQuery = fmt.Sprintf("seconds=%d", seconds) + fullURL := p.hostURL.JoinPath(profilePath) + + var body io.Reader + req, err := http.NewRequestWithContext(ctx, http.MethodGet, fullURL.String(), body) + + if err != nil { + return fmt.Errorf("failed to build profile HTTP request %s: %w", fullURL.String(), err) + } + + resp, err := http.DefaultClient.Do(req) + if err != nil { + return fmt.Errorf("profile endpoint failed %s: %w", fullURL.String(), err) + } + + defer resp.Body.Close() + + if resp.StatusCode != http.StatusOK { + return fmt.Errorf("%s returned status code %d: %w", fullURL.String(), resp.StatusCode, ErrPProfEndpointFailed) + } + + file, err := os.Create(outFilePath) + if err != nil { + return fmt.Errorf("unable to create file %s: %w", outFilePath, err) + } + + defer file.Close() + + _, err = io.Copy(file, resp.Body) + if err != nil { + return fmt.Errorf("unable to write profile to file %s: %w", outFilePath, err) + } + + return nil +} diff --git a/internal/pprofgetter/pprofgetter_test.go b/internal/pprofgetter/pprofgetter_test.go new file mode 100644 index 0000000..f1a5a83 --- /dev/null +++ b/internal/pprofgetter/pprofgetter_test.go @@ -0,0 +1,116 @@ +package pprofgetter + +import ( + "context" + "net/http" + "net/http/httptest" + "net/url" + "os" + "path" + "reflect" + "testing" + + "github.com/stretchr/testify/assert" +) + +func TestNewPProfGetter(t *testing.T) { + fakeURL := &url.URL{ + Host: "foo", + } + tests := []struct { + name string + options []Option + want *PProfGetter + wantErr bool + }{ + { + name: "no host url", + options: nil, + want: nil, + wantErr: true, + }, + { + name: "with host url", + options: []Option{WithHostURL(fakeURL)}, + want: &PProfGetter{hostURL: fakeURL}, + wantErr: false, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + got, err := NewPProfGetter(tt.options...) + if (err != nil) != tt.wantErr { + t.Errorf("NewPProfGetter() error = %v, wantErr %v", err, tt.wantErr) + + return + } + if !reflect.DeepEqual(got, tt.want) { + t.Errorf("NewPProfGetter() got = %v, want %v", got, tt.want) + } + }) + } +} + +func TestPProfGetter_Get(t *testing.T) { + expectedOutput := "foo" + testServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusOK) + _, err := w.Write([]byte(expectedOutput)) + assert.NoError(t, err) + })) + + defer testServer.Close() + + parsedURL, err := url.Parse(testServer.URL) + assert.NoError(t, err) + + fakeURL := &url.URL{ + Scheme: "http", + Host: parsedURL.Host, + } + + outputFileDir, err := os.MkdirTemp("", "pproftest") + assert.NoError(t, err) + + defer os.RemoveAll(outputFileDir) + + outFilePath := path.Join(outputFileDir, "foo.out") + + p := &PProfGetter{ + hostURL: fakeURL, + } + + err = p.Get(context.TODO(), CPUProfileName, 0, outFilePath) + assert.NoError(t, err) + + actual, err := os.ReadFile(outFilePath) + assert.NoError(t, err) + assert.Equal(t, expectedOutput, string(actual)) +} + +func TestPProfGetter_GetFailed(t *testing.T) { + testServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusNotFound) + })) + defer testServer.Close() + + parsedURL, err := url.Parse(testServer.URL) + assert.NoError(t, err) + fakeURL := &url.URL{ + Scheme: "http", + Host: parsedURL.Host, + } + + outputFileDir, err := os.MkdirTemp("", "pproftest") + assert.NoError(t, err) + + defer os.RemoveAll(outputFileDir) + + outFilePath := path.Join(outputFileDir, "foo.out") + + p := &PProfGetter{ + hostURL: fakeURL, + } + err = p.Get(context.TODO(), CPUProfileName, 0, outFilePath) + assert.ErrorContains(t, err, ErrPProfEndpointFailed.Error()) +}