-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
metrics.go
154 lines (136 loc) · 4.78 KB
/
metrics.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
// Copyright 2016 Google LLC
//
// 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
//
// http://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.
package logadmin
import (
"context"
"fmt"
vkit "cloud.google.com/go/logging/apiv2"
"google.golang.org/api/iterator"
logpb "google.golang.org/genproto/googleapis/logging/v2"
)
// Metric describes a logs-based metric. The value of the metric is the
// number of log entries that match a logs filter.
//
// Metrics are a feature of Cloud Monitoring.
// See https://cloud.google.com/monitoring/api/v3/metrics for more about them.
type Metric struct {
// ID is a client-assigned metric identifier. Example:
// "severe_errors". Metric identifiers are limited to 1000
// characters and can include only the following characters: A-Z,
// a-z, 0-9, and the special characters _-.,+!*',()%/\. The
// forward-slash character (/) denotes a hierarchy of name pieces,
// and it cannot be the first character of the name.
ID string
// Description describes this metric. It is used in documentation.
Description string
// Filter is an advanced logs filter (see
// https://cloud.google.com/logging/docs/view/advanced_filters).
// Example: "logName:syslog AND severity>=ERROR".
Filter string
}
// CreateMetric creates a logs-based metric.
func (c *Client) CreateMetric(ctx context.Context, m *Metric) error {
_, err := c.mClient.CreateLogMetric(ctx, &logpb.CreateLogMetricRequest{
Parent: c.parent,
Metric: toLogMetric(m),
})
return err
}
// DeleteMetric deletes a log-based metric.
// The provided metric ID is the metric identifier. For example, "severe_errors".
func (c *Client) DeleteMetric(ctx context.Context, metricID string) error {
return c.mClient.DeleteLogMetric(ctx, &logpb.DeleteLogMetricRequest{
MetricName: c.metricPath(metricID),
})
}
// Metric gets a logs-based metric.
// The provided metric ID is the metric identifier. For example, "severe_errors".
// Requires ReadScope or AdminScope.
func (c *Client) Metric(ctx context.Context, metricID string) (*Metric, error) {
lm, err := c.mClient.GetLogMetric(ctx, &logpb.GetLogMetricRequest{
MetricName: c.metricPath(metricID),
})
if err != nil {
return nil, err
}
return fromLogMetric(lm), nil
}
// UpdateMetric creates a logs-based metric if it does not exist, or updates an
// existing one.
func (c *Client) UpdateMetric(ctx context.Context, m *Metric) error {
_, err := c.mClient.UpdateLogMetric(ctx, &logpb.UpdateLogMetricRequest{
MetricName: c.metricPath(m.ID),
Metric: toLogMetric(m),
})
return err
}
func (c *Client) metricPath(metricID string) string {
return fmt.Sprintf("%s/metrics/%s", c.parent, metricID)
}
// Metrics returns a MetricIterator for iterating over all Metrics in the Client's project.
// Requires ReadScope or AdminScope.
func (c *Client) Metrics(ctx context.Context) *MetricIterator {
it := &MetricIterator{
it: c.mClient.ListLogMetrics(ctx, &logpb.ListLogMetricsRequest{Parent: c.parent}),
}
it.pageInfo, it.nextFunc = iterator.NewPageInfo(
it.fetch,
func() int { return len(it.items) },
func() interface{} { b := it.items; it.items = nil; return b })
return it
}
// A MetricIterator iterates over Metrics.
type MetricIterator struct {
it *vkit.LogMetricIterator
pageInfo *iterator.PageInfo
nextFunc func() error
items []*Metric
}
// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *MetricIterator) PageInfo() *iterator.PageInfo { return it.pageInfo }
// Next returns the next result. Its second return value is Done if there are
// no more results. Once Next returns Done, all subsequent calls will return
// Done.
func (it *MetricIterator) Next() (*Metric, error) {
if err := it.nextFunc(); err != nil {
return nil, err
}
item := it.items[0]
it.items = it.items[1:]
return item, nil
}
func (it *MetricIterator) fetch(pageSize int, pageToken string) (string, error) {
return iterFetch(pageSize, pageToken, it.it.PageInfo(), func() error {
item, err := it.it.Next()
if err != nil {
return err
}
it.items = append(it.items, fromLogMetric(item))
return nil
})
}
func toLogMetric(m *Metric) *logpb.LogMetric {
return &logpb.LogMetric{
Name: m.ID,
Description: m.Description,
Filter: m.Filter,
}
}
func fromLogMetric(lm *logpb.LogMetric) *Metric {
return &Metric{
ID: lm.Name,
Description: lm.Description,
Filter: lm.Filter,
}
}