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olympus.go
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olympus.go
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package olympus
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/gomods/athens/pkg/eventlog"
)
// Log represents event log fetched from remote olympus server
type Log struct {
uri string
}
// NewLog creates log reader from remote olympus log
func NewLog(uri string) eventlog.Eventlog {
return &Log{uri: uri}
}
// Read reads all events in event log.
func (o *Log) Read() ([]eventlog.Event, error) {
return o.ReadFrom("")
}
// ReadFrom reads all events from the log starting at event with specified id (excluded).
// If id is not found behaves like Read().
func (o *Log) ReadFrom(id string) ([]eventlog.Event, error) {
eventlogURI := fmt.Sprintf("%s/eventlog/%s", o.uri, id)
// fetch mod file
client := http.Client{
Timeout: 180 * time.Second,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return &eventlog.ErrUseNewOlympus{Endpoint: req.URL.String()}
},
}
resp, err := client.Get(eventlogURI)
if err != nil {
return nil, err
}
defer resp.Body.Close()
el, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
var events []eventlog.Event
err = json.Unmarshal(el, &events)
return events, err
}
// ReadSingle gets the module metadata about the given module/version.
// If something went wrong doing the get operation, returns a non-nil error.
func (o *Log) ReadSingle(module, version string) (eventlog.Event, error) {
return eventlog.Event{}, errors.New("TODO: implement")
}
// Append appends Event to event log and returns its ID.
func (o *Log) Append(event eventlog.Event) (string, error) {
// TODO: implement cache miss reporting
return "", nil
}
// Clear is a method for clearing entire state of event log
func (o *Log) Clear(id string) error {
// Do not implement, we cannot clear remote olympus
return nil
}