| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package frontend |
| |
| import ( |
| "context" |
| "errors" |
| "sync" |
| |
| "golang.org/x/pkgsite/internal" |
| "golang.org/x/pkgsite/internal/derrors" |
| "golang.org/x/pkgsite/internal/log" |
| "golang.org/x/pkgsite/internal/middleware" |
| ) |
| |
| // GetLatestInfo returns various pieces of information about the latest |
| // versions of a unit and module: |
| // - The linkable form of the minor version of the unit. |
| // - The latest module path and the full unit path of any major version found given the |
| // fullPath and the modulePath. |
| // It returns empty strings on error. |
| // It is intended to be used as an argument to middleware.LatestVersions. |
| func (s *Server) GetLatestInfo(ctx context.Context, unitPath, modulePath string) (latest middleware.LatestInfo) { |
| // It is okay to use a different DataSource (DB connection) than the rest of the |
| // request, because this makes self-contained calls on the DB. |
| ds := s.getDataSource(ctx) |
| |
| var wg sync.WaitGroup |
| |
| wg.Add(1) |
| go func() { |
| defer wg.Done() |
| var err error |
| latest.MinorVersion, err = latestMinorVersion(ctx, ds, unitPath, internal.UnknownModulePath) |
| if err != nil { |
| log.Errorf(ctx, "latestMinorVersion: %v", err) |
| } |
| }() |
| |
| wg.Add(1) |
| go func() { |
| defer wg.Done() |
| var err error |
| latest.MajorModulePath, latest.MajorUnitPath, err = ds.GetLatestMajorVersion(ctx, unitPath, modulePath) |
| if err != nil && !errors.Is(err, derrors.NotFound) { |
| log.Errorf(ctx, "GetLatestMajorVersion: %v", err) |
| } |
| }() |
| |
| wg.Wait() |
| return latest |
| } |
| |
| // TODO(https://github.com/golang/go/issues/40107): this is currently tested in server_test.go, but |
| // we should add tests for this function. |
| func latestMinorVersion(ctx context.Context, ds internal.DataSource, unitPath, modulePath string) (_ string, err error) { |
| defer derrors.Wrap(&err, "latestMinorVersion(ctx, %q, %q)", unitPath, modulePath) |
| um, err := ds.GetUnitMeta(ctx, unitPath, modulePath, internal.LatestVersion) |
| if err != nil { |
| return "", err |
| } |
| return linkVersion(um.Version, um.ModulePath), nil |
| } |