diff options
Diffstat (limited to 'vendor/github.com/getlantern/context')
| -rw-r--r-- | vendor/github.com/getlantern/context/LICENSE | 202 | ||||
| -rw-r--r-- | vendor/github.com/getlantern/context/README.md | 6 | ||||
| -rw-r--r-- | vendor/github.com/getlantern/context/context.go | 309 | ||||
| -rw-r--r-- | vendor/github.com/getlantern/context/context_test.go | 160 | ||||
| -rw-r--r-- | vendor/github.com/getlantern/context/gotrack.go | 130 |
5 files changed, 807 insertions, 0 deletions
diff --git a/vendor/github.com/getlantern/context/LICENSE b/vendor/github.com/getlantern/context/LICENSE new file mode 100644 index 0000000..5dc6c26 --- /dev/null +++ b/vendor/github.com/getlantern/context/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS + + APPENDIX: How to apply the Apache License to your work. + + To apply the Apache License to your work, attach the following + boilerplate notice, with the fields enclosed by brackets "[]" + replaced with your own identifying information. (Don't include + the brackets!) The text should be enclosed in the appropriate + comment syntax for the file format. We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright 2016 Brave New Software Project, Inc. + + 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. diff --git a/vendor/github.com/getlantern/context/README.md b/vendor/github.com/getlantern/context/README.md new file mode 100644 index 0000000..978c9e0 --- /dev/null +++ b/vendor/github.com/getlantern/context/README.md @@ -0,0 +1,6 @@ +# context [](https://travis-ci.org/getlantern/context) [](https://coveralls.io/r/getlantern/context) + +Provides goroutine-based context state inspired by https://github.com/tylerb/gls +and https://github.com/jtolds/gls. It uses the same basic hack as tylerb's +library, but adds a stack abstraction that allows nested contexts similar to +jtolds' library, but using `Enter()` and `Exit()` instead of callback functions. diff --git a/vendor/github.com/getlantern/context/context.go b/vendor/github.com/getlantern/context/context.go new file mode 100644 index 0000000..c77f129 --- /dev/null +++ b/vendor/github.com/getlantern/context/context.go @@ -0,0 +1,309 @@ +// Package context provides a mechanism for transparently tracking contextual +// state associated to the current goroutine and even across goroutines. +package context + +import ( + "sync" +) + +// Manager provides the ability to create and access Contexts. +type Manager interface { + // Enter enters a new level on the current Context stack, creating a new Context + // if necessary. + Enter() Context + + // Go starts the given function on a new goroutine but sharing the context of + // the current goroutine (if it has one). + Go(func()) + + // PutGlobal puts the given key->value pair into the global context. + PutGlobal(key string, value interface{}) + + // PutGlobalDynamic puts a key->value pair into the global context where the + // value is generated by a function that gets evaluated at every Read. If the + // value is a map[string]interface{}, we will unpack the map and set each + // contained key->value pair independently. + PutGlobalDynamic(key string, valueFN func() interface{}) + + // AsMap returns a map containing all values from the supplied obj if it is a + // Contextual, plus any addition values from along the stack, plus globals if so + // specified. + AsMap(obj interface{}, includeGlobals bool) Map +} + +type manager struct { + contexts map[uint64]*context + mxContexts sync.RWMutex + global Map + mxGlobal sync.RWMutex +} + +// NewManager creates a new Manager +func NewManager() Manager { + return &manager{ + contexts: make(map[uint64]*context), + global: make(Map), + } +} + +// Contextual is an interface for anything that maintains its own context. +type Contextual interface { + // Fill fills the given Map with all of this Contextual's context + Fill(m Map) +} + +// Map is a map of key->value pairs. +type Map map[string]interface{} + +// Fill implements the method from the Contextual interface. +func (_m Map) Fill(m Map) { + for key, value := range _m { + m[key] = value + } +} + +// Context is a context containing key->value pairs +type Context interface { + // Enter enters a new level on this Context stack. + Enter() Context + + // Go starts the given function on a new goroutine. + Go(fn func()) + + // Exit exits the current level on this Context stack. + Exit() + + // Put puts a key->value pair into the current level of the context stack. + Put(key string, value interface{}) Context + + // PutIfAbsent puts the given key->value pair into the current level of the + // context stack if and only if that key is defined nowhere within the context + // stack (including parent contexts). + PutIfAbsent(key string, value interface{}) Context + + // PutDynamic puts a key->value pair into the current level of the context + // stack where the value is generated by a function that gets evaluated at + // every Read. If the value is a map[string]interface{}, we will unpack the + // map and set each contained key->value pair independently. + PutDynamic(key string, valueFN func() interface{}) Context + + // Fill fills the given map with data from this Context + Fill(m Map) + + // AsMap returns a map containing all values from the supplied obj if it is a + // Contextual, plus any addition values from along the stack, plus globals if + // so specified. + AsMap(obj interface{}, includeGlobals bool) Map +} + +type context struct { + cm *manager + id uint64 + parent *context + branchedFrom *context + data Map + mx sync.RWMutex +} + +type dynval struct { + fn func() interface{} +} + +func (cm *manager) Enter() Context { + return cm.enter(curGoroutineID()) +} + +func (cm *manager) enter(id uint64) *context { + cm.mxContexts.Lock() + parentOrNil := cm.contexts[id] + c := cm.makeContext(id, parentOrNil, nil) + cm.contexts[id] = c + cm.mxContexts.Unlock() + return c +} + +func (cm *manager) exit(id uint64, parent *context) { + cm.mxContexts.Lock() + if parent == nil { + delete(cm.contexts, id) + } else { + cm.contexts[id] = parent + } + cm.mxContexts.Unlock() +} + +func (cm *manager) branch(id uint64, from *context) { + next := cm.makeContext(id, nil, from) + cm.mxContexts.Lock() + cm.contexts[id] = next + cm.mxContexts.Unlock() +} + +func (cm *manager) merge(id uint64) { + cm.mxContexts.Lock() + delete(cm.contexts, id) + cm.mxContexts.Unlock() +} + +func (c *context) Enter() Context { + c.mx.RLock() + id := c.id + c.mx.RUnlock() + return c.cm.enter(id) +} + +func (c *context) Go(fn func()) { + go func() { + id := curGoroutineID() + c.cm.branch(id, c) + fn() + c.cm.merge(id) + }() +} + +func (cm *manager) Go(fn func()) { + c := cm.currentContext() + if c != nil { + c.Go(fn) + } else { + go fn() + } +} + +func (cm *manager) makeContext(id uint64, parent *context, branchedFrom *context) *context { + return &context{ + cm: cm, + id: id, + parent: parent, + branchedFrom: branchedFrom, + data: make(Map), + } +} + +func (c *context) Exit() { + c.mx.RLock() + id := c.id + parent := c.parent + c.mx.RUnlock() + c.cm.exit(id, parent) +} + +func (c *context) Put(key string, value interface{}) Context { + c.mx.Lock() + c.data[key] = value + c.mx.Unlock() + return c +} + +func (c *context) PutIfAbsent(key string, value interface{}) Context { + for ctx := c; ctx != nil; { + ctx.mx.RLock() + _, exists := ctx.data[key] + next := ctx.parent + if next == nil { + next = ctx.branchedFrom + } + ctx.mx.RUnlock() + if exists { + return c + } + ctx = next + } + + // Value not set, set it + return c.Put(key, value) +} + +func (c *context) PutDynamic(key string, valueFN func() interface{}) Context { + value := &dynval{valueFN} + c.mx.Lock() + c.data[key] = value + c.mx.Unlock() + return c +} + +func (cm *manager) PutGlobal(key string, value interface{}) { + cm.mxGlobal.Lock() + cm.global[key] = value + cm.mxGlobal.Unlock() +} + +func (cm *manager) PutGlobalDynamic(key string, valueFN func() interface{}) { + value := &dynval{valueFN} + cm.mxGlobal.Lock() + cm.global[key] = value + cm.mxGlobal.Unlock() +} + +func (c *context) Fill(m Map) { + for ctx := c; ctx != nil; { + ctx.mx.RLock() + fill(m, ctx.data) + next := ctx.parent + if next == nil { + next = ctx.branchedFrom + } + ctx.mx.RUnlock() + ctx = next + } +} + +func (cm *manager) AsMap(obj interface{}, includeGlobals bool) Map { + return cm.currentContext().asMap(cm, obj, includeGlobals) +} + +func (c *context) AsMap(obj interface{}, includeGlobals bool) Map { + return c.asMap(c.cm, obj, includeGlobals) +} + +func (c *context) asMap(cm *manager, obj interface{}, includeGlobals bool) Map { + result := make(Map, 0) + cl, ok := obj.(Contextual) + if ok { + cl.Fill(result) + } + if c != nil { + c.Fill(result) + } + if includeGlobals { + cm.mxGlobal.RLock() + fill(result, cm.global) + cm.mxGlobal.RUnlock() + } + return result +} + +func fill(m Map, from Map) { + if m != nil { + doFill := func(key string, _value interface{}) { + switch value := _value.(type) { + case map[string]interface{}: + for k, v := range value { + m[k] = v + } + default: + m[key] = value + } + } + + for key, value := range from { + _, alreadyRead := m[key] + if !alreadyRead { + switch v := value.(type) { + case *dynval: + doFill(key, v.fn()) + default: + doFill(key, v) + } + } + } + } +} + +func (cm *manager) currentContext() *context { + id := curGoroutineID() + cm.mxContexts.RLock() + c := cm.contexts[id] + cm.mxContexts.RUnlock() + return c +} diff --git a/vendor/github.com/getlantern/context/context_test.go b/vendor/github.com/getlantern/context/context_test.go new file mode 100644 index 0000000..9fb86f3 --- /dev/null +++ b/vendor/github.com/getlantern/context/context_test.go @@ -0,0 +1,160 @@ +package context + +import ( + "sync" + "testing" + + "github.com/stretchr/testify/assert" +) + +func TestStack(t *testing.T) { + cm := NewManager() + _cm := cm.(*manager) + // Put globals first + cm.PutGlobal("a", -1) // This will get overriden in specific contexts + cm.PutGlobal("ga", "i") + cm.PutGlobalDynamic("gb", func() interface{} { return "ii" }) + cm.PutGlobalDynamic("gm", func() interface{} { return map[string]interface{}{"gm3": "iii", "gm4": "iv"} }) + + // Use a Map as a Contextual + var contextual = Map{ + "a": 0, // This will override whatever is in specific contexts + "contextual": "special", + } + + c := cm.Enter() + c.Put("a", 1) + penultimate := cm.Enter(). + Put("b", 2) + c = cm.Enter(). + PutDynamic("c", func() interface{} { return 4 }). + PutIfAbsent("d", 5). + PutIfAbsent("a", 11) + + // Put something in the penultimate context and make sure it doesn't override + // what's set in the ultimate context + penultimate.Put("c", 3) + + var assertMutex sync.Mutex + doAssertContents := func(expected Map, actual Map, scope string) { + assertMutex.Lock() + assert.Equal(t, expected, actual, scope) + assertMutex.Unlock() + } + + assertContents := func(expected Map) { + doAssertContents(expected, cm.AsMap(nil, false), "AsMapwith(nil, false)") + expected["ga"] = "i" + expected["gb"] = "ii" + expected["gm3"] = "iii" + expected["gm4"] = "iv" + _, exists := expected["a"] + if !exists { + expected["a"] = -1 + } + doAssertContents(expected, cm.AsMap(nil, true), "AsMap(nil, true)") + expected["a"] = 0 + expected["contextual"] = "special" + doAssertContents(expected, cm.AsMap(contextual, true), "AsMapWith(contextual, true)") + delete(expected, "ga") + delete(expected, "gb") + delete(expected, "gm3") + delete(expected, "gm4") + doAssertContents(expected, cm.AsMap(contextual, false), "AsMapWith(contextual, false)") + } + + assertContents(Map{ + "a": 1, + "b": 2, + "c": 4, + "d": 5, + }) + + var wg sync.WaitGroup + wg.Add(1) + cm.Go(func() { + defer cm.Enter().Put("e", 6).Exit() + assertContents(Map{ + "a": 1, + "b": 2, + "c": 4, + "d": 5, + "e": 6, + }) + wg.Done() + }) + wg.Wait() + + wg.Add(1) + cm.Go(func() { + // This goroutine doesn't Exit. Still, we shouldn't leak anything. + wg.Done() + }) + wg.Wait() + + assertContents(Map{ + "a": 1, + "b": 2, + "c": 4, + "d": 5, + }) + + c.Exit() + c = _cm.currentContext() + assert.NotNil(t, c) + assertContents(Map{ + "a": 1, + "b": 2, + "c": 3, + }) + + c.Exit() + c = _cm.currentContext() + assert.NotNil(t, c) + assertContents(Map{ + "a": 1, + }) + + // Last exit + c.Exit() + assert.Nil(t, _cm.currentContext()) + assertContents(Map{}) + + // Exit again, just for good measure + c.Exit() + assert.Nil(t, _cm.currentContext()) + assertContents(Map{}) + + // Spawn a goroutine with no existing contexts + wg.Add(1) + cm.Go(func() { + defer cm.Enter().Put("f", 7).Exit() + assertContents(Map{ + "f": 7, + }) + wg.Done() + }) + wg.Wait() + + _cm.mxContexts.Lock() + assert.Empty(t, _cm.contexts, "No contexts should be left") + _cm.mxContexts.Unlock() +} + +func BenchmarkPut(b *testing.B) { + cm := NewManager() + c := cm.Enter() + b.ResetTimer() + for i := 0; i < b.N; i++ { + c.Put("key", "value") + } +} + +func BenchmarkAsMap(b *testing.B) { + cm := NewManager() + cm.Enter().Put("a", 1).Put("b", 2) + b.ResetTimer() + for i := 0; i < b.N; i++ { + cm.AsMap(nil, true) + } +} diff --git a/vendor/github.com/getlantern/context/gotrack.go b/vendor/github.com/getlantern/context/gotrack.go new file mode 100644 index 0000000..7f92346 --- /dev/null +++ b/vendor/github.com/getlantern/context/gotrack.go @@ -0,0 +1,130 @@ +package context + +import ( + "bytes" + "errors" + "fmt" + "runtime" + "strconv" + "sync" +) + +// Sourced https://github.com/bradfitz/http2/blob/dc0c5c000ec33e263612939744d51a3b68b9cece/gotrack.go +var goroutineSpace = []byte("goroutine ") +var littleBuf = sync.Pool{ + New: func() interface{} { + buf := make([]byte, 64) + return &buf + }, +} + +func curGoroutineID() uint64 { + bp := littleBuf.Get().(*[]byte) + defer littleBuf.Put(bp) + b := *bp + b = b[:runtime.Stack(b, false)] + // Parse the 4707 out of "goroutine 4707 [" + b = bytes.TrimPrefix(b, goroutineSpace) + i := bytes.IndexByte(b, ' ') + if i < 0 { + panic(fmt.Sprintf("No space found in %q", b)) + } + b = b[:i] + n, err := parseUintBytes(b, 10, 64) + if err != nil { + panic(fmt.Sprintf("Failed to parse goroutine ID out of %q: %v", b, err)) + } + return n +} + +// parseUintBytes is like strconv.ParseUint, but using a []byte. +func parseUintBytes(s []byte, base int, bitSize int) (n uint64, err error) { + var cutoff, maxVal uint64 + + if bitSize == 0 { + bitSize = int(strconv.IntSize) + } + + s0 := s + switch { + case len(s) < 1: + err = strconv.ErrSyntax + return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err} + + case 2 <= base && base <= 36: + // valid base; nothing to do + + case base == 0: + // Look for octal, hex prefix. + switch { + case s[0] == '0' && len(s) > 1 && (s[1] == 'x' || s[1] == 'X'): + base = 16 + s = s[2:] + if len(s) < 1 { + err = strconv.ErrSyntax + return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err} + } + case s[0] == '0': + base = 8 + default: + base = 10 + } + + default: + err = errors.New("invalid base " + strconv.Itoa(base)) + return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err} + } + + n = 0 + cutoff = cutoff64(base) + maxVal = 1<<uint(bitSize) - 1 + + for i := 0; i < len(s); i++ { + var v byte + d := s[i] + switch { + case '0' <= d && d <= '9': + v = d - '0' + case 'a' <= d && d <= 'z': + v = d - 'a' + 10 + case 'A' <= d && d <= 'Z': + v = d - 'A' + 10 + default: + n = 0 + err = strconv.ErrSyntax + return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err} + } + if int(v) >= base { + n = 0 + err = strconv.ErrSyntax + return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err} + } + + if n >= cutoff { + // n*base overflows + n = 1<<64 - 1 + err = strconv.ErrRange + return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err} + } + n *= uint64(base) + + n1 := n + uint64(v) + if n1 < n || n1 > maxVal { + // n+v overflows + n = 1<<64 - 1 + err = strconv.ErrRange + return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err} + } + n = n1 + } + + return n, nil +} + +// Return the first number n such that n*base >= 1<<64. +func cutoff64(base int) uint64 { + if base < 2 { + return 0 + } + return (1<<64-1)/uint64(base) + 1 +} |