go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/cipd/appengine/impl/monitoring/metrics.go (about)

     1  // Copyright 2019 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package monitoring
    16  
    17  import (
    18  	"context"
    19  
    20  	"go.chromium.org/luci/common/errors"
    21  	"go.chromium.org/luci/common/tsmon/field"
    22  	"go.chromium.org/luci/common/tsmon/metric"
    23  	"go.chromium.org/luci/common/tsmon/types"
    24  	"go.chromium.org/luci/server/auth"
    25  )
    26  
    27  var bytesRequested = metric.NewCounter(
    28  	"downloads/bytes",
    29  	"Bytes requested for download by clients.",
    30  	&types.MetricMetadata{Units: types.Bytes},
    31  	field.String("client_name"),
    32  	field.String("client_email"),
    33  	field.String("download_source"),
    34  )
    35  
    36  // FileSize handles file size information. If client requests are being
    37  // monitored it will be reported.
    38  func FileSize(ctx context.Context, bytes uint64) {
    39  	cfg, err := monitoringConfig(ctx)
    40  	if err != nil {
    41  		errors.Log(ctx, errors.Annotate(err, "failed to fetch monitoring config").Err())
    42  		return
    43  	}
    44  	if cfg == nil {
    45  		return
    46  	}
    47  	// Technically uint64 -> int64 may overflow but there are bigger problems than
    48  	// a panic if a user requested a CIPD package larger than math.MaxInt64 bytes.
    49  	bytesRequested.Add(ctx, int64(bytes), cfg.Label, string(auth.CurrentIdentity(ctx)), "GCS")
    50  }