diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml new file mode 100644 index 0000000..13550dc --- /dev/null +++ b/.github/workflows/ci.yaml @@ -0,0 +1,44 @@ +name: Run tests + +on: + workflow_dispatch: + pull_request: + push: + schedule: + - cron: '35 15 * * 1' + +permissions: + contents: read + +jobs: + test: + runs-on: ubuntu-latest + steps: + - name: Checkout + uses: actions/checkout@v2 + + - name: Go setup + uses: actions/setup-go@v2 + with: + go-version: 1 + + - uses: actions/cache@v2 + with: + # https://github.com/actions/cache/blob/main/examples.md#go---modules + path: | + ~/.cache/go-build + ~/go/pkg/mod + key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }} + restore-keys: | + ${{ runner.os }}-go- + + - name: Dependencies + run: go get -v + + - name: Build + run: go build -v ./... + + - name: Test + run: go test -v ./... + +# vim: set sw=2 sts=2 et : --> diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml new file mode 100644 index 0000000..dcacad4 --- /dev/null +++ b/.github/workflows/release.yaml @@ -0,0 +1,58 @@ +name: Release packaging + +on: + workflow_dispatch: + push: + branches: + - main + tags: + - 'v[0-9]+.*' + +permissions: + contents: write + +jobs: + release: + runs-on: ubuntu-latest + steps: + - name: Checkout + uses: actions/checkout@v2 + with: + # Required by GoReleaser + fetch-depth: 0 + + - name: Go setup + uses: actions/setup-go@v2 + with: + go-version: 1 + + - name: Set variables + id: vars + env: + EVENT_NAME: ${{ github.event_name }} + REF: ${{ github.ref }} + run: | + if [[ "$EVENT_NAME" = push && "$REF" = refs/tags/v[0-9]*.* ]]; then + args=() + else + args=( --skip-publish ) + fi + echo "::set-output name=goreleaser_args::${args[*]}" + + - name: Run GoReleaser + uses: goreleaser/goreleaser-action@v2 + with: + distribution: goreleaser + version: latest + args: release --rm-dist ${{ steps.vars.outputs.goreleaser_args }} + env: + GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} + + - name: Upload assets + uses: actions/upload-artifact@v2 + with: + name: prometheus-textformat-merge-${{ hashFiles('dist/**') }} + path: dist/** + if-no-files-found: error + +# vim: set sw=2 sts=2 et : --> diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ebba780 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/prometheus-textformat-merge +/dist/ diff --git a/.goreleaser.yml b/.goreleaser.yml new file mode 100644 index 0000000..5162c90 --- /dev/null +++ b/.goreleaser.yml @@ -0,0 +1,60 @@ +# Configuration for GoReleaser +# https://goreleaser.com/ + +project_name: prometheus-textformat-merge + +builds: + - main: . + binary: prometheus-textformat-merge + env: + - CGO_ENABLED=0 + goos: + - darwin + - linux + - windows + goarch: + - amd64 + - arm + - arm64 + ignore: + - goos: linux + goarch: arm64 + - goos: windows + goarch: arm + - goos: windows + goarch: arm64 + flags: + - -trimpath + +nfpms: + - description: Utility to merge Prometheus textformat files + maintainer: M. Hanselmann + bindir: /usr/bin + license: BSD-3-Clause + formats: + - deb + - rpm + contents: + - src: ./README.md + dst: /usr/share/doc/prometheus-textformat-merge/README.md + - src: ./LICENSE + dst: /usr/share/doc/prometheus-textformat-merge/LICENSE + +archives: + - format: tar.gz + wrap_in_directory: true + files: + - LICENSE + - README.md + format_overrides: + - goos: windows + format: zip + +release: + draft: true + prerelease: auto + +snapshot: + name_template: '{{ .Tag }}.snapshot{{ replace (replace .Date ":" "") "-" "" }}.g{{ .ShortCommit }}' + +# vim: set sw=2 sts=2 et : diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..2ea63f0 --- /dev/null +++ b/LICENSE @@ -0,0 +1,27 @@ +Copyright (c) 2021 Michael Hanselmann. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + * Neither the name of the copyright holder nor the names of its +contributors may be used to endorse or promote products derived from +this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..de5ad53 --- /dev/null +++ b/README.md @@ -0,0 +1,79 @@ +# Utility to merge Prometheus textformat files + +[![Latest release](https://img.shields.io/github/v/release/hansmi/prometheus-textformat-merge)][releases] +[![Release workflow](https://github.com/hansmi/prometheus-textformat-merge/actions/workflows/release.yaml/badge.svg)](https://github.com/hansmi/prometheus-textformat-merge/actions/workflows/release.yaml) +[![CI workflow](https://github.com/hansmi/prometheus-textformat-merge/actions/workflows/ci.yaml/badge.svg)](https://github.com/hansmi/prometheus-textformat-merge/actions/workflows/ci.yaml) +[![Go reference](https://pkg.go.dev/badge/github.com/hansmi/prometheus-textformat-merge.svg)](https://pkg.go.dev/github.com/hansmi/prometheus-textformat-merge) + +Prometheus' [node exporter][node_exporter_doc] has a `textfile` collector +reading [textformat][prom_textformat] files in a predetermined directory. When +multiple files contain the same metrics, albeit with different labels, +collection fails. + +There are also use cases where combining multiple metrics sources is useful, +e.g. after downloading them from a collector using [cURL][curl]. + +## Example usage + +```bash +$ cat >first.prom <<'EOF' +# HELP node_disk_io_time_seconds_total Total seconds spent doing I/Os. +# TYPE node_disk_io_time_seconds_total counter +node_disk_io_time_seconds_total{device="dm-0"} 581.412 +node_disk_io_time_seconds_total{device="dm-1"} 483.348 +EOF + +$ cat >second.prom <<'EOF' +# HELP node_load5 5m load average. +# TYPE node_load5 gauge +node_load5 0.42 +EOF + +$ prometheus-textformat-merge first.prom second.prom +# HELP node_disk_io_time_seconds_total Total seconds spent doing I/Os. +# TYPE node_disk_io_time_seconds_total counter +node_disk_io_time_seconds_total{device="dm-0"} 581.412 +node_disk_io_time_seconds_total{device="dm-1"} 483.348 +# HELP node_load5 5m load average. +# TYPE node_load5 gauge +node_load5 0.42 +``` + +Reading from standard input is also supported with the `-` placeholder: + +```bash +$ prometheus-textformat-merge first.prom - <<'EOF' +# TYPE node_disk_io_time_seconds_total counter +node_disk_io_time_seconds_total{device="dm-4"} 104.156 +node_disk_io_time_seconds_total{device="dm-5"} 0.372 +EOF +# HELP node_disk_io_time_seconds_total Total seconds spent doing I/Os. +# TYPE node_disk_io_time_seconds_total counter +node_disk_io_time_seconds_total{device="dm-0"} 581.412 +node_disk_io_time_seconds_total{device="dm-1"} 483.348 +node_disk_io_time_seconds_total{device="dm-4"} 104.156 +node_disk_io_time_seconds_total{device="dm-5"} 0.372 +``` + +Note how the same metric was combined from multiple sources. See the `--help` +output for available flags. + +## Installation + +Pre-built binaries are provided for all [releases][releases]: + +* Binary archives (`.tar.gz`) +* Debian/Ubuntu (`.deb`) +* RHEL/Fedora (`.rpm`) + +With the source being available it's also possible to produce custom builds +directly using [Go][golang] or [GoReleaser][goreleaser]. + +[node_exporter_doc]: https://prometheus.io/docs/guides/node-exporter/ +[prom_textformat]: https://prometheus.io/docs/instrumenting/exposition_formats/ +[curl]: https://curl.se/ +[releases]: https://github.com/hansmi/prometheus-textformat-merge/releases/latest +[golang]: https://golang.org/ +[goreleaser]: https://goreleaser.com/ + + diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..e8c44f3 --- /dev/null +++ b/go.mod @@ -0,0 +1,12 @@ +module github.com/hansmi/prometheus-textformat-merge + +go 1.15 + +require ( + github.com/golang/protobuf v1.5.2 // indirect + github.com/google/go-cmp v0.5.5 + github.com/prometheus/client_model 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string + Process(func(io.Reader) error) error +} + +// processAndClose invokes the given function, passing the reader as an +// argument, and always closes the reader before returning. +func processAndClose(name string, r io.ReadCloser, fn func(io.Reader) error) error { + defer r.Close() + + if err := fn(r); err != nil { + return fmt.Errorf("%s: %w", name, err) + } + + return nil +} + +type readerInputWrapper struct { + name string + r io.ReadCloser +} + +var _ inputWrapper = (*readerInputWrapper)(nil) + +func newReaderInputWrapper(r io.ReadCloser) *readerInputWrapper { + var name string + + if rn, ok := r.(interface{ Name() string }); ok { + name = rn.Name() + } else { + name = fmt.Sprint(r) + } + + return &readerInputWrapper{ + name: name, + r: r, + } +} + +func (w *readerInputWrapper) Name() string { + return w.name +} + +func (w *readerInputWrapper) Process(fn func(io.Reader) error) error { + return processAndClose(w.name, w.r, fn) +} + +type fileInputWrapper struct { + path string +} + +var _ inputWrapper = (*fileInputWrapper)(nil) + +func (w *fileInputWrapper) Name() string { + return w.path +} + +func (w *fileInputWrapper) Process(fn func(io.Reader) error) error { + r, err := os.Open(w.path) + if err != nil { + return err + } + + return processAndClose(r.Name(), r, fn) +} + +func inputWrappersFromPaths(paths []string) []inputWrapper { + var result []inputWrapper + + for _, i := range paths { + var r inputWrapper + + if i == stdinPlaceholder { + r = newReaderInputWrapper(stdinReader) + } else { + r = &fileInputWrapper{path: i} + } + + result = append(result, r) + } + + return result +} + +func readMetricFamilies(w inputWrapper) (parsedInput, error) { + var families map[string]*dto.MetricFamily + + if err := w.Process(func(r io.Reader) error { + var err error + var parser expfmt.TextParser + families, err = parser.TextToMetricFamilies(r) + return err + }); err != nil { + return parsedInput{}, err + } + + return parsedInput{ + name: w.Name(), + families: families, + }, nil +} + +type parsedInput struct { + name string + families map[string]*dto.MetricFamily +} + +// readInputs parses all inputs, up to GOMAXPROCS concurrently, before sending +// the resulting metric families to the given channel. Input order is preserved. +func readInputs(ctx context.Context, inputs []inputWrapper, parsedCh chan<- parsedInput) error { + g, ctx := errgroup.WithContext(ctx) + + // Limit number of outstanding readers. The outer channel is used to + // preserve the input order. + readers := make(chan (<-chan parsedInput), runtime.GOMAXPROCS(0)) + + g.Go(func() error { + defer close(readers) + + for _, w := range inputs { + w := w + + r := make(chan parsedInput) + + select { + case readers <- r: + case <-ctx.Done(): + return ctx.Err() + } + + g.Go(func() error { + defer close(r) + + p, err := readMetricFamilies(w) + if err != nil { + return err + } + + select { + case r <- p: + case <-ctx.Done(): + return ctx.Err() + } + + return nil + }) + } + + return nil + }) + + g.Go(func() error { + for r := range readers { + for p := range r { + parsedCh <- p + } + } + + return nil + }) + + return g.Wait() +} diff --git a/input_test.go b/input_test.go new file mode 100644 index 0000000..83e83a0 --- /dev/null +++ b/input_test.go @@ -0,0 +1,200 @@ +package main + +import ( + "io" + "io/ioutil" + "path/filepath" + "regexp" + "strings" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/google/go-cmp/cmp/cmpopts" + dto "github.com/prometheus/client_model/go" +) + +func newString(value string) *string { + return &value +} + +func newFloat64(value float64) *float64 { + return &value +} + +func withReplacedStdinReader(t *testing.T, content string) { + origStdinReader := stdinReader + + t.Cleanup(func() { + stdinReader = origStdinReader + }) + + stdinReader = ioutil.NopCloser(strings.NewReader(content)) +} + +type fakeReaderWithName struct { + *strings.Reader + name string +} + +func newFakeReaderWithName(name, content string) *fakeReaderWithName { + return &fakeReaderWithName{ + name: name, + Reader: strings.NewReader(content), + } +} + +func (i *fakeReaderWithName) Name() string { + return i.name +} + +func (i *fakeReaderWithName) Close() error { + return nil +} + +func TestMakeReaderInputWrapper(t *testing.T) { + for _, tc := range []struct { + name string + r io.ReadCloser + wantName string + }{ + { + name: "nil", + wantName: "", + }, + { + name: "in-memory", + r: ioutil.NopCloser(strings.NewReader("content")), + }, + { + name: "file", + r: newFakeReaderWithName("testname", "content"), + wantName: "testname", + }, + } { + t.Run(tc.name, func(t *testing.T) { + got := newReaderInputWrapper(tc.r) + + if tc.wantName != "" { + if diff := cmp.Diff(got.Name(), tc.wantName); diff != "" { + t.Errorf("reader names difference (-got +want):\n%s", diff) + } + } + }) + } +} + +func TestInputWrappersFromPaths(t *testing.T) { + tmpdir := t.TempDir() + + fileA := filepath.Join(tmpdir, "a.txt") + fileB := filepath.Join(tmpdir, "b.txt") + + for _, path := range []string{fileA, fileB} { + if err := ioutil.WriteFile(path, []byte(filepath.Base(path)), 0o644); err != nil { + t.Error(err) + } + } + + for _, tc := range []struct { + name string + paths []string + want []string + }{ + {name: "empty"}, + { + name: "stdin only", + paths: []string{"-"}, + want: []string{"stdin:stdin only"}, + }, + { + name: "mixed", + paths: []string{fileA, "-", fileB}, + want: []string{"a.txt", "stdin:mixed", "b.txt"}, + }, + } { + t.Run(tc.name, func(t *testing.T) { + withReplacedStdinReader(t, "stdin:"+tc.name) + + var got []string + + for _, i := range inputWrappersFromPaths(tc.paths) { + if err := i.Process(func(r io.Reader) error { + content, err := ioutil.ReadAll(r) + if err != nil { + return err + } + + got = append(got, string(content)) + + return nil + }); err != nil { + t.Errorf("%v: %v", i, err) + } + } + + if diff := cmp.Diff(got, tc.want); diff != "" { + t.Errorf("reader contents difference (-got +want):\n%s", diff) + } + }) + } +} + +func TestReadMetricFamilies(t *testing.T) { + for _, tc := range []struct { + name string + wrapper inputWrapper + want parsedInput + wantErr *regexp.Regexp + }{ + { + name: "empty", + wrapper: newReaderInputWrapper(newFakeReaderWithName("testname", "")), + want: parsedInput{ + name: "testname", + }, + }, + { + name: "two metrics", + wrapper: newReaderInputWrapper(newFakeReaderWithName("metrics", + "size 444\n# HELP weight foo\n# TYPE weight gauge\nweight 111\n")), + want: parsedInput{ + name: "metrics", + families: map[string]*dto.MetricFamily{ + "size": nil, + "weight": nil, + }, + }, + }, + { + name: "wrong format", + wrapper: newReaderInputWrapper(newFakeReaderWithName("bad", "x\ny\nz")), + wantErr: regexp.MustCompile(`^bad:.+: expected float as value\b`), + }, + } { + t.Run(tc.name, func(t *testing.T) { + got, err := readMetricFamilies(tc.wrapper) + + if tc.wantErr != nil { + if err == nil || !tc.wantErr.MatchString(err.Error()) { + t.Errorf("readMetricFamilies() failed with %v, want match for %q", err, tc.wantErr.String()) + } + } else if err != nil { + t.Errorf("readMetricFamilies() failed with %v", err) + } + + if err == nil { + opts := []cmp.Option{ + cmp.AllowUnexported(parsedInput{}), + cmpopts.EquateEmpty(), + + // Comparing dto.MetricFamily is hard, so let's ignore it here + cmpopts.IgnoreTypes(&dto.MetricFamily{}), + } + + if diff := cmp.Diff(got, tc.want, opts...); diff != "" { + t.Errorf("readMetricFamilies() difference (-got +want):\n%s", diff) + } + } + }) + } +} diff --git a/main.go b/main.go new file mode 100644 index 0000000..a20ae97 --- /dev/null +++ b/main.go @@ -0,0 +1,48 @@ +package main + +import ( + "context" + "flag" + "fmt" + "log" + "os" +) + +func main() { + flag.Usage = func() { + w := flag.CommandLine.Output() + + fmt.Fprintf(w, "Usage: %s [file...]\n", os.Args[0]) + fmt.Fprintln(w, ` +Combine one or multiple Prometheus text format inputs. Metric families sharing +a name must also have the same type. The lexicographically lowest help string +per family is used. The resulting metrics are not validated. + +If no input files are given standard input is read. Use "-" as a placeholder to +combine standard input with regular files. + +Flags:`) + flag.PrintDefaults() + } + + includeInputs := flag.Bool("s", false, "Emit comment with paths of input files") + + flag.Parse() + + var paths []string + + if flag.NArg() == 0 { + paths = []string{stdinPlaceholder} + } else { + paths = flag.Args() + } + + merged, err := readAndMerge(context.Background(), inputWrappersFromPaths(paths)) + if err != nil { + log.Fatal(err) + } + + if err := merged.write(os.Stdout, *includeInputs); err != nil { + log.Fatalf("Writing output failed: %v", err) + } +} diff --git a/merge.go b/merge.go new file mode 100644 index 0000000..5e18baa --- /dev/null +++ b/merge.go @@ -0,0 +1,147 @@ +package main + +import ( + "context" + "fmt" + "io" + "sort" + "strings" + + "github.com/prometheus/common/expfmt" + "golang.org/x/sync/errgroup" + + dto "github.com/prometheus/client_model/go" +) + +// mergeFamily combines two metric families. The destination is modified and returned. +func mergeFamily(dst *dto.MetricFamily, src *dto.MetricFamily) (*dto.MetricFamily, error) { + if dst == nil { + return src, nil + } + + if dst.GetName() != src.GetName() { + return nil, fmt.Errorf("name mismatch (dst is %q, src is %q)", dst.GetName(), src.GetName()) + } + + if dst.GetType() != src.GetType() { + return nil, fmt.Errorf("type mismatch (dst is %v, src is %v)", dst.GetType(), src.GetType()) + } + + if dst.GetHelp() > src.GetHelp() && len(strings.TrimSpace(src.GetHelp())) > 0 { + dst.Help = src.Help + } + + dst.Metric = append(dst.Metric, src.Metric...) + + return dst, nil +} + +type mergedInputs struct { + names []string + families []*dto.MetricFamily +} + +func (c *mergedInputs) write(w io.Writer, includeNames bool) error { + if includeNames { + io.WriteString(w, "# Sources:\n") + + for _, i := range c.names { + fmt.Fprintf(w, "# %s\n", i) + } + + io.WriteString(w, "\n") + } + + for _, mf := range c.families { + if _, err := expfmt.MetricFamilyToText(w, mf); err != nil { + return fmt.Errorf("%s: %w", mf.GetName(), err) + } + } + + return nil +} + +type metricsMerger struct { + inputNames []string + byName map[string]*dto.MetricFamily +} + +func newMetricsMerger() *metricsMerger { + return &metricsMerger{ + byName: make(map[string]*dto.MetricFamily), + } +} + +func (m *metricsMerger) append(input parsedInput) error { + m.inputNames = append(m.inputNames, input.name) + + for _, mf := range input.families { + var err error + + name := mf.GetName() + + m.byName[name], err = mergeFamily(m.byName[name], mf) + + if err != nil { + return fmt.Errorf("family %q from %q: %w", name, input.name, err) + } + } + + return nil +} + +func (m *metricsMerger) finalize() *mergedInputs { + families := make([]*dto.MetricFamily, 0, len(m.byName)) + + for _, mf := range m.byName { + families = append(families, mf) + } + + // Sort by name + sort.Slice(families, func(a, b int) bool { + return families[a].GetName() < families[b].GetName() + }) + + return &mergedInputs{ + names: m.inputNames, + families: families, + } +} + +func mergeInputs(ctx context.Context, inputsCh <-chan parsedInput) (*mergedInputs, error) { + merger := newMetricsMerger() + + for cur := range inputsCh { + if err := merger.append(cur); err != nil { + return nil, err + } + } + + return merger.finalize(), nil +} + +func readAndMerge(ctx context.Context, inputs []inputWrapper) (*mergedInputs, error) { + g, ctx := errgroup.WithContext(ctx) + + parsedCh := make(chan parsedInput, 0) + + g.Go(func() error { + defer close(parsedCh) + + return readInputs(ctx, inputs, parsedCh) + }) + + var merged *mergedInputs + + g.Go(func() error { + var err error + merged, err = mergeInputs(ctx, parsedCh) + return err + }) + + if err := g.Wait(); err != nil { + return nil, err + } + + return merged, nil +} diff --git a/merge_test.go b/merge_test.go new file mode 100644 index 0000000..3dec60d --- /dev/null +++ b/merge_test.go @@ -0,0 +1,330 @@ +package main + +import ( + "context" + "fmt" + "regexp" + "runtime" + "strings" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/google/go-cmp/cmp/cmpopts" + + dto "github.com/prometheus/client_model/go" +) + +func TestMergeFamily(t *testing.T) { + for _, tc := range []struct { + name string + dst *dto.MetricFamily + src *dto.MetricFamily + want *dto.MetricFamily + wantErr *regexp.Regexp + }{ + { + name: "empty", + dst: &dto.MetricFamily{}, + src: &dto.MetricFamily{}, + want: &dto.MetricFamily{}, + }, + { + name: "empty dst", + dst: nil, + src: &dto.MetricFamily{Name: newString("src")}, + want: &dto.MetricFamily{Name: newString("src")}, + }, + { + name: "name mismatch", + dst: &dto.MetricFamily{Name: newString("foo")}, + src: &dto.MetricFamily{Name: newString("bar")}, + wantErr: regexp.MustCompile(`^name mismatch\b`), + }, + { + name: "type mismatch", + dst: &dto.MetricFamily{Name: newString("size"), Type: dto.MetricType_GAUGE.Enum()}, + src: &dto.MetricFamily{Name: newString("size"), Type: dto.MetricType_COUNTER.Enum()}, + wantErr: regexp.MustCompile(`^type mismatch\b`), + }, + { + name: "help swap aa,bb", + dst: &dto.MetricFamily{Name: newString("count"), Help: newString("aa")}, + src: &dto.MetricFamily{Name: newString("count"), Help: newString("bb")}, + want: &dto.MetricFamily{Name: newString("count"), Help: newString("aa")}, + }, + { + name: "help swap bb,aa", + dst: &dto.MetricFamily{Name: newString("count"), Help: newString("bb")}, + src: &dto.MetricFamily{Name: newString("count"), Help: newString("aa")}, + want: &dto.MetricFamily{Name: newString("count"), Help: newString("aa")}, + }, + { + name: "empty src help", + dst: &dto.MetricFamily{Name: newString("count"), Help: newString("bb")}, + src: &dto.MetricFamily{Name: newString("count")}, + want: &dto.MetricFamily{Name: newString("count"), Help: newString("bb")}, + }, + { + name: "append metrics", + dst: &dto.MetricFamily{Name: newString("xyz"), Metric: []*dto.Metric{ + {Gauge: &dto.Gauge{Value: newFloat64(1)}}, + }}, + src: &dto.MetricFamily{Name: newString("xyz"), Metric: []*dto.Metric{ + {Gauge: &dto.Gauge{Value: newFloat64(9)}}, + {Gauge: &dto.Gauge{Value: newFloat64(8)}}, + }}, + want: &dto.MetricFamily{Name: newString("xyz"), Metric: []*dto.Metric{ + {Gauge: &dto.Gauge{Value: newFloat64(1)}}, + {Gauge: &dto.Gauge{Value: newFloat64(9)}}, + {Gauge: &dto.Gauge{Value: newFloat64(8)}}, + }}, + }, + } { + t.Run(tc.name, func(t *testing.T) { + got, err := mergeFamily(tc.dst, tc.src) + + if tc.wantErr != nil { + if err == nil || !tc.wantErr.MatchString(err.Error()) { + t.Errorf("mergeFamily() failed with %v, want match for %q", err, tc.wantErr.String()) + } + } else if err != nil { + t.Errorf("mergeFamily() failed with %v", err) + } + + if err == nil { + if diff := cmp.Diff(got, tc.want, cmpopts.EquateEmpty()); diff != "" { + t.Errorf("mergeFamily() difference (-got +want):\n%s", diff) + } + } + }) + } +} + +func TestMergedInputsWrite(t *testing.T) { + for _, tc := range []struct { + name string + names bool + inputs mergedInputs + want string + }{ + { + name: "empty", + }, + { + name: "empty with names", + names: true, + want: "# Sources:\n\n", + }, + { + name: "two with names", + names: true, + inputs: mergedInputs{ + names: []string{"aaa.txt", "zzz.txt", "bbb.txt"}, + families: []*dto.MetricFamily{ + { + Name: newString("first"), + Type: dto.MetricType_COUNTER.Enum(), + Help: newString("this is a test"), + Metric: []*dto.Metric{ + { + Counter: &dto.Counter{Value: newFloat64(13621)}, + }, + }, + }, + { + Name: newString("requests"), + Type: dto.MetricType_COUNTER.Enum(), + Metric: []*dto.Metric{ + { + Label: []*dto.LabelPair{ + {Name: newString("kind"), Value: newString("post")}, + }, + Counter: &dto.Counter{Value: newFloat64(14955)}, + }, + { + Label: []*dto.LabelPair{ + {Name: newString("kind"), Value: newString("get")}, + }, + Counter: &dto.Counter{Value: newFloat64(18193)}, + }, + }, + }, + }, + }, + want: `# Sources: +# aaa.txt +# zzz.txt +# bbb.txt + +# HELP first this is a test +# TYPE first counter +first 13621 +# TYPE requests counter +requests{kind="post"} 14955 +requests{kind="get"} 18193 +`, + }, + } { + t.Run(tc.name, func(t *testing.T) { + var buf strings.Builder + + err := tc.inputs.write(&buf, tc.names) + + if err != nil { + t.Errorf("mergedInputs() failed: %v", err) + } else if diff := cmp.Diff(buf.String(), tc.want); diff != "" { + t.Errorf("mergedInputs() difference (-got +want):\n%s", diff) + } + }) + } +} +func TestReadAndMerge(t *testing.T) { + for _, tc := range []struct { + name string + inputs []inputWrapper + want *mergedInputs + wantErr *regexp.Regexp + }{ + { + name: "empty", + want: &mergedInputs{}, + }, + { + name: "single gauge", + inputs: []inputWrapper{ + newReaderInputWrapper(newFakeReaderWithName("a.txt", + "# TYPE size GAUGE\nsize{kind=\"a\"} 1\n")), + }, + want: &mergedInputs{ + names: []string{"a.txt"}, + families: []*dto.MetricFamily{ + { + Name: newString("size"), + Type: dto.MetricType_GAUGE.Enum(), + Metric: []*dto.Metric{ + { + Label: []*dto.LabelPair{ + {Name: newString("kind"), Value: newString("a")}, + }, + Gauge: &dto.Gauge{Value: newFloat64(1)}, + }, + }, + }, + }, + }, + }, + { + name: "multiple inputs", + inputs: []inputWrapper{ + newReaderInputWrapper(newFakeReaderWithName("a.txt", + "# TYPE requests COUNTER\nrequests{kind=\"a\"} 26191\n")), + newReaderInputWrapper(newFakeReaderWithName("b.txt", + "# TYPE requests COUNTER\nrequests{kind=\"b\"} 15123\n"+ + "# TYPE size GAUGE\nsize 11477\n"+ + "# TYPE aborted COUNTER\naborted 5694\n")), + }, + want: &mergedInputs{ + names: []string{"a.txt", "b.txt"}, + families: []*dto.MetricFamily{ + { + Name: newString("aborted"), + Type: dto.MetricType_COUNTER.Enum(), + Metric: []*dto.Metric{ + { + Counter: &dto.Counter{Value: newFloat64(5694)}, + }, + }, + }, + { + Name: newString("requests"), + Type: dto.MetricType_COUNTER.Enum(), + Metric: []*dto.Metric{ + { + Label: []*dto.LabelPair{ + {Name: newString("kind"), Value: newString("a")}, + }, + Counter: &dto.Counter{Value: newFloat64(26191)}, + }, + { + Label: []*dto.LabelPair{ + {Name: newString("kind"), Value: newString("b")}, + }, + Counter: &dto.Counter{Value: newFloat64(15123)}, + }, + }, + }, + { + Name: newString("size"), + Type: dto.MetricType_GAUGE.Enum(), + Metric: []*dto.Metric{ + { + Gauge: &dto.Gauge{Value: newFloat64(11477)}, + }, + }, + }, + }, + }, + }, + { + name: "type mismatch", + inputs: []inputWrapper{ + newReaderInputWrapper(newFakeReaderWithName("a.txt", + "# TYPE wrong GAUGE\nwrong 1\n")), + newReaderInputWrapper(newFakeReaderWithName("b.txt", + "# TYPE wrong COUNTER\nwrong 2\n")), + }, + wantErr: regexp.MustCompile(`^family "wrong" from "b.txt": type mismatch\b`), + }, + } { + t.Run(tc.name, func(t *testing.T) { + ctx, cancel := context.WithCancel(context.Background()) + t.Cleanup(cancel) + + got, err := readAndMerge(ctx, tc.inputs) + + if tc.wantErr != nil { + if err == nil || !tc.wantErr.MatchString(err.Error()) { + t.Errorf("readAndMerge() failed with %v, want match for %q", err, tc.wantErr.String()) + } + } else if err != nil { + t.Errorf("readAndMerge() failed with %v", err) + } + + if err == nil { + if diff := cmp.Diff(got, tc.want, cmp.AllowUnexported(mergedInputs{}), cmpopts.EquateEmpty(), cmpopts.EquateApprox(0, 0.0001)); diff != "" { + t.Errorf("readAndMerge() difference (-got +want):\n%s", diff) + } + } + }) + } +} + +func TestReadAndMergeMany(t *testing.T) { + ctx, cancel := context.WithCancel(context.Background()) + t.Cleanup(cancel) + + var inputs []inputWrapper + var wantNames []string + var count = 100 + runtime.GOMAXPROCS(0) + + for i := 0; i < count; i++ { + name := fmt.Sprintf("input%d", i) + wantNames = append(wantNames, name) + inputs = append(inputs, newReaderInputWrapper(newFakeReaderWithName(name, + fmt.Sprintf("# TYPE test%[1]d GAUGE\ntest%[1]d %[1]d\n", i)))) + } + + got, err := readAndMerge(ctx, inputs) + + if err != nil { + t.Errorf("readAndMerge() failed: %v", err) + } + + if diff := cmp.Diff(got.names, wantNames); diff != "" { + t.Errorf("names difference (-got +want):\n%s", diff) + } + + if len(got.families) != count { + t.Errorf("Result contained %d families, not %d: %v", len(got.families), count, got) + } +}