[chore]: Add Profiles Marshaler to otlptext

.chloggen/julianocosta89_debugexporter-profiles.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: debugexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Implement text marshaler for profiles
+
+# One or more tracking issues or pull requests related to the change
+issues: [11155]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

exporter/internal/otlptext/profiles.go

@@ -0,0 +1,43 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package otlptext // import "go.opentelemetry.io/collector/exporter/internal/otlptext"
+
+import "go.opentelemetry.io/collector/pdata/pprofile"
+
+// NewTextProfilesMarshaler returns a pprofile.Marshaler to encode to OTLP text bytes.
+func NewTextProfilesMarshaler() pprofile.Marshaler {
+	return textProfilesMarshaler{}
+}
+
+type textProfilesMarshaler struct{}
+
+// MarshalProfiles pprofile.Profiles to OTLP text.
+func (textProfilesMarshaler) MarshalProfiles(pd pprofile.Profiles) ([]byte, error) {
+	buf := dataBuffer{}
+	rps := pd.ResourceProfiles()
+	for i := 0; i < rps.Len(); i++ {
+		buf.logEntry("ResourceProfiles #%d", i)
+		rp := rps.At(i)
+		buf.logEntry("Resource SchemaURL: %s", rp.SchemaUrl())
+		buf.logAttributes("Resource attributes", rp.Resource().Attributes())
+		ilps := rp.ScopeProfiles()
+		for j := 0; j < ilps.Len(); j++ {
+			buf.logEntry("ScopeProfiles #%d", j)
+			ilp := ilps.At(j)
+			buf.logEntry("ScopeProfiles SchemaURL: %s", ilp.SchemaUrl())
+			buf.logInstrumentationScope(ilp.Scope())
+			profiles := ilp.Profiles()
+			for k := 0; k < profiles.Len(); k++ {
+				buf.logEntry("Profile #%d", k)
+				profile := profiles.At(k)
+				buf.logAttr("Profile ID", profile.ProfileID())
+				buf.logAttr("Start time", profile.StartTime().String())
+				buf.logAttr("End time", profile.EndTime().String())
+				buf.logAttributes("Attributes", profile.Attributes())
+			}
+		}
+	}
+
+	return buf.buf.Bytes(), nil
+}

exporter/internal/otlptext/profiles_test.go

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+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package otlptext
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"go.opentelemetry.io/collector/pdata/pprofile"
+	"go.opentelemetry.io/collector/pdata/testdata"
+)
+
+func TestProfilesText(t *testing.T) {
+	tests := []struct {
+		name string
+		in   pprofile.Profiles
+		out  string
+	}{
+		{
+			name: "empty_profiles",
+			in:   pprofile.NewProfiles(),
+			out:  "empty.out",
+		},
+		{
+			name: "two_profiles",
+			in:   testdata.GenerateProfiles(2),
+			out:  "two_profiles.out",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NewTextProfilesMarshaler().MarshalProfiles(tt.in)
+			assert.NoError(t, err)
+			out, err := os.ReadFile(filepath.Join("testdata", "profiles", tt.out))
+			require.NoError(t, err)
+			expected := strings.ReplaceAll(string(out), "\r", "")
+			assert.Equal(t, expected, string(got))
+		})
+	}
+}

exporter/internal/otlptext/testdata/profiles/two_profiles.out

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+ResourceProfiles #0
+Resource SchemaURL: 
+Resource attributes:
+     -> resource-attr: Str(resource-attr-val-1)
+ScopeProfiles #0
+ScopeProfiles SchemaURL: 
+InstrumentationScope  
+Profile #0
+    Profile ID     : 0102030405060708090a0b0c0d0e0f10
+    Start time     : 2020-02-11 20:26:12.000000321 +0000 UTC
+    End time       : 2020-02-11 20:26:13.000000789 +0000 UTC
+Profile #1
+    Profile ID     : 0202030405060708090a0b0c0d0e0f10
+    Start time     : 2020-02-11 20:26:12.000000321 +0000 UTC
+    End time       : 2020-02-11 20:26:13.000000789 +0000 UTC