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/
local_store_reader.go
114 lines (97 loc) · 2.79 KB
/
local_store_reader.go
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package routing
import (
"fmt"
"regexp"
"time"
"code.cloudfoundry.org/go-loggregator/rpc/loggregator_v2"
"code.cloudfoundry.org/log-cache/pkg/rpc/logcache_v1"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
// LocalStoreReader accesses a store via gRPC calls. It handles converting the
// requests into a form that the store understands for reading.
type LocalStoreReader struct {
s StoreReader
}
// StoreReader proxies to the log cache for getting envelopes or Log Cache
// Metadata.
type StoreReader interface {
// Gets envelopes from a local or remote Log Cache.
Get(
sourceID string,
start time.Time,
end time.Time,
envelopeTypes []logcache_v1.EnvelopeType,
nameFilter *regexp.Regexp,
limit int,
descending bool,
) []*loggregator_v2.Envelope
// Meta gets the metadata from Log Cache instances in the cluster.
Meta() map[string]logcache_v1.MetaInfo
}
// NewLocalStoreReader creates and returns a new LocalStoreReader.
func NewLocalStoreReader(s StoreReader) *LocalStoreReader {
return &LocalStoreReader{
s: s,
}
}
// Read returns data from the store.
func (r *LocalStoreReader) Read(ctx context.Context, req *logcache_v1.ReadRequest, opts ...grpc.CallOption) (*logcache_v1.ReadResponse, error) {
if req.EndTime != 0 && req.StartTime > req.EndTime {
return nil, fmt.Errorf("StartTime (%d) must be before EndTime (%d)", req.StartTime, req.EndTime)
}
if req.Limit > 1000 {
return nil, fmt.Errorf("Limit (%d) must be 1000 or less", req.Limit)
}
if req.Limit < 0 {
return nil, fmt.Errorf("Limit (%d) must be greater than zero", req.Limit)
}
if req.EndTime == 0 {
req.EndTime = time.Now().UnixNano()
}
if req.Limit == 0 {
req.Limit = 100
}
var nameFilter *regexp.Regexp
var err error
if req.NameFilter != "" {
nameFilter, err = regexp.Compile(req.NameFilter)
if err != nil {
return nil, fmt.Errorf("Name filter must be a valid regular expression: %s", err)
}
}
var envelopeTypes []logcache_v1.EnvelopeType
for _, e := range req.GetEnvelopeTypes() {
if e != logcache_v1.EnvelopeType_ANY {
envelopeTypes = append(envelopeTypes, e)
}
}
envs := r.s.Get(
req.SourceId,
time.Unix(0, req.StartTime),
time.Unix(0, req.EndTime),
envelopeTypes,
nameFilter,
int(req.Limit),
req.Descending,
)
resp := &logcache_v1.ReadResponse{
Envelopes: &loggregator_v2.EnvelopeBatch{
Batch: envs,
},
}
return resp, nil
}
func (r *LocalStoreReader) Meta(ctx context.Context, req *logcache_v1.MetaRequest, opts ...grpc.CallOption) (*logcache_v1.MetaResponse, error) {
sourceIds := r.s.Meta()
metaInfo := make(map[string]*logcache_v1.MetaInfo)
for sourceId, m := range sourceIds {
// Shadow m so that the range function does not mess with the
// instance.
m := m
metaInfo[sourceId] = &m
}
return &logcache_v1.MetaResponse{
Meta: metaInfo,
}, nil
}