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receiver/prometheus: start implementation. (#267)
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// Copyright 2018, OpenCensus Authors | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// https://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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// Package prometheus has the logic for scraping Prometheus metrics from | ||
// already instrumented applications and then passing them onto a metricsink instance. | ||
package prometheus |
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// Copyright 2018, OpenCensus Authors | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// https://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package prometheus | ||
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import ( | ||
"errors" | ||
"time" | ||
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"github.com/census-instrumentation/opencensus-service/receiver" | ||
) | ||
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// Receiver is the type used to handle metrics from OpenCensus exporters. | ||
type Receiver struct { | ||
metricSink receiver.MetricsReceiverSink | ||
metricBufferPeriod time.Duration | ||
metricBufferCount int | ||
} | ||
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// New creates a new prometheus.Receiver reference. | ||
func New(ms receiver.MetricsReceiverSink, opts ...Option) (*Receiver, error) { | ||
if ms == nil { | ||
return nil, errors.New("needs a non-nil receiver.MetricsReceiverSink") | ||
} | ||
pr := &Receiver{metricSink: ms} | ||
for _, opt := range opts { | ||
opt.WithReceiver(pr) | ||
} | ||
return pr, nil | ||
} | ||
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const receiverName = "prometheus" | ||
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// Export is the gRPC method that exports streamed metrics from | ||
// OpenCensus-metricproto compatible libraries/applications to MetricSink. | ||
func (pr *Receiver) Export() error { | ||
// TODO: scrape metrics from Prometheus endpoint and convert to OC metrics. | ||
return nil | ||
} |
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// Copyright 2018, OpenCensus Authors | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// https://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package prometheus | ||
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import "time" | ||
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// Option interface defines for configuration settings to be applied to receivers. | ||
// | ||
// WithReceiver applies the configuration to the given receiver. | ||
type Option interface { | ||
WithReceiver(*Receiver) | ||
} | ||
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type metricBufferPeriod struct { | ||
period time.Duration | ||
} | ||
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var _ Option = (*metricBufferPeriod)(nil) | ||
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func (mfd *metricBufferPeriod) WithReceiver(ocr *Receiver) { | ||
ocr.metricBufferPeriod = mfd.period | ||
} | ||
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// WithMetricBufferPeriod is an option that allows one to configure | ||
// the period that spans are buffered for before the Receiver | ||
// sends them to its MetricsReceiver. | ||
func WithMetricBufferPeriod(period time.Duration) Option { | ||
return &metricBufferPeriod{period: period} | ||
} | ||
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type metricBufferCount int | ||
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var _ Option = (*metricBufferCount)(nil) | ||
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func (mpc metricBufferCount) WithReceiver(oci *Receiver) { | ||
oci.metricBufferCount = int(mpc) | ||
} | ||
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// WithMetricBufferCount is an option that allows one to configure | ||
// the number of metrics that are buffered before the Receiver | ||
// send them to its MetricsReceiverSink. | ||
func WithMetricBufferCount(count int) Option { | ||
return metricBufferCount(count) | ||
} |