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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // Copyright The OpenTelemetry 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 | ||
| // | ||
| // 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 schema | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/url" | ||
| "strings" | ||
|
|
||
| "github.com/Masterminds/semver/v3" | ||
| ) | ||
|
|
||
| type Comparison uint8 | ||
|
|
||
| const ( | ||
| invalidComparison Comparison = iota | ||
| EqualTo | ||
| GreaterThan | ||
| LessThan | ||
| ) | ||
|
|
||
| // CompareVersions compares schema URL versions and returns the Comparison of a | ||
| // vs b (i.e. a is [comparison value] b). | ||
| func CompareVersions(a, b string) (Comparison, error) { | ||
| aVer, err := version(a) | ||
| if err != nil { | ||
| return invalidComparison, fmt.Errorf("invalid version for %q: %w", a, err) | ||
| } | ||
|
|
||
| bVer, err := version(b) | ||
| if err != nil { | ||
| return invalidComparison, fmt.Errorf("invalid version for %q: %w", b, err) | ||
| } | ||
|
|
||
| switch aVer.Compare(bVer) { | ||
| case -1: | ||
| return LessThan, nil | ||
| case 0: | ||
| return EqualTo, nil | ||
| case 1: | ||
| return GreaterThan, nil | ||
| default: | ||
| return invalidComparison, fmt.Errorf("unable to compare versions: %s, %s", aVer, bVer) | ||
| } | ||
| } | ||
|
|
||
| func version(schemaURL string) (*semver.Version, error) { | ||
| // https://github.com/open-telemetry/oteps/blob/main/text/0152-telemetry-schemas.md#schema-url | ||
| u, err := url.Parse(schemaURL) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return semver.NewVersion(u.Path[strings.LastIndex(u.Path, "/")+1:]) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // Copyright The OpenTelemetry 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 | ||
| // | ||
| // 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 schema | ||
|
|
||
| import ( | ||
| "context" | ||
| "net/http" | ||
|
|
||
| sUtil "go.opentelemetry.io/otel/schema/v1.1" | ||
| "go.opentelemetry.io/otel/schema/v1.1/ast" | ||
| ) | ||
|
|
||
| type cache struct { | ||
| data map[string]*ast.Schema | ||
| } | ||
|
|
||
| func (c *cache) lookup(key string, f func() (*ast.Schema, error)) (*ast.Schema, error) { | ||
| if c.data == nil { | ||
| s, err := f() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| c.data = map[string]*ast.Schema{key: s} | ||
| return s, nil | ||
| } | ||
|
|
||
| if s, ok := c.data[key]; ok { | ||
| return s, nil | ||
| } | ||
|
|
||
| s, err := f() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| c.data = map[string]*ast.Schema{key: s} | ||
| return s, nil | ||
| } | ||
|
|
||
| // Registry hold a registration of schema files. It will cache any schema files | ||
| // it gets from external URLs. | ||
| type Registry struct { | ||
| client *http.Client | ||
|
|
||
| cache cache | ||
| } | ||
|
|
||
| // NewRegistry returns a Registry that uses the HTTP client. If client is nil | ||
| // it will use the default client from "net/http". | ||
| func NewRegistry(client *http.Client) *Registry { | ||
| if client == nil { | ||
| client = http.DefaultClient | ||
| } | ||
| return &Registry{client: client} | ||
| } | ||
|
|
||
| // Get returns the Schema at the target schemaURL using the registry client. | ||
| func (r *Registry) Get(ctx context.Context, schemaURL string) (*ast.Schema, error) { | ||
| return r.cache.lookup(schemaURL, func() (*ast.Schema, error) { | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodGet, schemaURL, http.NoBody) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| resp, err := r.client.Do(req) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer resp.Body.Close() | ||
| return sUtil.Parse(resp.Body) | ||
| }) | ||
| } |
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