From c9c7666cd515a9461cc8722ddd5427a8993db976 Mon Sep 17 00:00:00 2001 From: Zahary Karadjov Date: Wed, 25 Apr 2018 03:13:46 +0300 Subject: [PATCH] Initial version of the library Implemented: * basic features for logging with severity levels * lexically scoped properties * dynamically scoped properties * 3 output formats (textline, textblock and json) * optional timestamps To-do: * compile-time filtering of certaiin topics and severity levels (potentially removing all logging) * optional run-time filtering * specification of the log outputs/formats through a define * colorful output in the terminal * documentation --- .gitignore | 8 ++ LICENSE-APACHEv2 | 201 +++++++++++++++++++++++++++++++++++ LICENSE-MIT | 21 ++++ README.md | 2 + chronicles.nim | 112 +++++++++++++++++++ chronicles.nimble | 21 ++++ chronicles/dynamic_scope.nim | 58 ++++++++++ chronicles/log_output.nim | 174 ++++++++++++++++++++++++++++++ chronicles/scope_helpers.nim | 14 +++ tests/all.nim | 1 + tests/dynamic_scopes.nim | 19 ++++ tests/lexical_scopes.nim | 26 +++++ 12 files changed, 657 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE-APACHEv2 create mode 100644 LICENSE-MIT create mode 100644 README.md create mode 100644 chronicles.nim create mode 100644 chronicles.nimble create mode 100644 chronicles/dynamic_scope.nim create mode 100644 chronicles/log_output.nim create mode 100644 chronicles/scope_helpers.nim create mode 100644 tests/all.nim create mode 100644 tests/dynamic_scopes.nim create mode 100644 tests/lexical_scopes.nim diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..cc935b3 --- /dev/null +++ b/.gitignore @@ -0,0 +1,8 @@ +# ignore all executable files +* +!*.* +!*/ +*.exe + +nimcache/ + diff --git a/LICENSE-APACHEv2 b/LICENSE-APACHEv2 new file mode 100644 index 0000000..782d1bf --- /dev/null +++ b/LICENSE-APACHEv2 @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..139597f --- /dev/null +++ b/README.md @@ -0,0 +1,2 @@ + + diff --git a/chronicles.nim b/chronicles.nim new file mode 100644 index 0000000..2e86547 --- /dev/null +++ b/chronicles.nim @@ -0,0 +1,112 @@ +import + macros, tables, + chronicles/[scope_helpers, dynamic_scope, log_output] + +export + dynamic_scope, log_output + +template lexScopeSymbolsIMPL* = + 0 # scope revision number + +type + BindingsSet = Table[string, NimNode] + +proc actualBody(n: NimNode): NimNode = + # skip over the double StmtList node introduced in `mergeScopes` + result = n.body + if result.kind == nnkStmtList and result[0].kind == nnkStmtList: + result = result[0] + +proc scopeRevision(scopeSymbols: NimNode): int = + # get the revision number from a `lexScopeSymbolsIMPL` sym + assert scopeSymbols.kind == nnkSym + var revisionNode = scopeSymbols.getImpl.actualBody[0] + result = int(revisionNode.intVal) + +proc lastScopeHolder(scopes: NimNode): NimNode = + # get the most recent `lexScopeSymbolsIMPL` from a symChoice node + if scopes.kind in {nnkClosedSymChoice, nnkOpenSymChoice}: + var bestScopeRev = 0 + assert scopes.len > 0 + for scope in scopes: + let rev = scope.scopeRevision + if result == nil or rev > bestScopeRev: + result = scope + bestScopeRev = rev + else: + result = scopes + + assert result.kind == nnkSym + +macro mergeScopes(scopes: typed, newBindings: untyped): untyped = + var + bestScope = scopes.lastScopeHolder + bestScopeRev = bestScope.scopeRevision + + var finalBindings = initTable[string, NimNode]() + for k, v in assignments(bestScope.getImpl.actualBody, skip = 1): + finalBindings[k] = v + + for k, v in assignments(newBindings): + finalBindings[k] = v + + var newScopeDefinition = newStmtList(newLit(bestScopeRev + 1)) + + for k, v in finalBindings: + newScopeDefinition.add newAssignment(newIdentNode(k), v) + + result = quote: + template lexScopeSymbolsIMPL = `newScopeDefinition` + +template logScope*(newBindings: untyped) {.dirty.} = + bind bindSym, mergeScopes, brForceOpen + mergeScopes(bindSym("lexScopeSymbolsIMPL", brForceOpen), + newBindings) + +macro logImpl(severity: LogLevel, scopes: typed, + logStmtProps: varargs[untyped]): untyped = + let lexicalScope = scopes.lastScopeHolder.getImpl.actualBody + var finalBindings = initOrderedTable[string, NimNode]() + + for k, v in assignments(lexicalScope, skip = 1): + finalBindings[k] = v + + for k, v in assignments(logStmtProps, skip = 1): + finalBindings[k] = v + + finalBindings.sort(system.cmp) + + let eventName = logStmtProps[0] + assert eventName.kind in {nnkStrLit} + let record = genSym(nskVar, "record") + + let threadId = when compileOption("threads"): newCall("getThreadId") + else: newLit(0) + + result = quote: + var `record`: LogOutput + setEventName(`record`, `severity`, `eventName`) + setFirstProperty(`record`, "thread", `threadId`) + + for k, v in finalBindings: + result.add newCall(newIdentNode"setProperty", record, newLit(k), v) + + result.add newCall(newIdentNode"logAllDynamicProperties", record) + result.add newCall(newIdentNode"flushRecord", record) + +template log*(severity: LogLevel, props: varargs[untyped]) {.dirty.} = + bind logImpl, bindSym, brForceOpen + logImpl(severity, bindSym("lexScopeSymbolsIMPL", brForceOpen), props) + +template logFn(name, severity) = + template `name`*(props: varargs[untyped]) = + bind log + log(severity, props) + +logFn debug , LogLevel.DEBUG +logFn info , LogLevel.INFO +logFn notice, LogLevel.NOTICE +logFn warn , LogLevel.WARN +logFn error , LogLevel.ERROR +logFn fatal , LogLevel.FATAL + diff --git a/chronicles.nimble b/chronicles.nimble new file mode 100644 index 0000000..3069daf --- /dev/null +++ b/chronicles.nimble @@ -0,0 +1,21 @@ +mode = ScriptMode.Verbose + +packageName = "chronicles" +version = "0.1.0" +author = "Status Research & Development GmbH" +description = "The premier structured logging library for Nim" +license = "Apache License 2.0" +skipDirs = @["tests"] + +requires "nim >= 0.19.0" + +proc configForTests() = + --hints: off + --debuginfo + --path: "." + --run + +task test, "run CPU tests": + configForTests() + setCommand "c", "tests/all.nim" + diff --git a/chronicles/dynamic_scope.nim b/chronicles/dynamic_scope.nim new file mode 100644 index 0000000..3bcd184 --- /dev/null +++ b/chronicles/dynamic_scope.nim @@ -0,0 +1,58 @@ +import + macros, log_output, scope_helpers + +type + ScopeBindingBase = ref object of RootObj + name: string + appender: LogAppender + + LogAppender = proc(x: var LogOutput, valueAddr: ScopeBindingBase) + + ScopeBinding[T] = ref object of ScopeBindingBase + value: T + +proc appenderIMPL[T](log: var LogOutput, valueAddr: ScopeBindingBase) = + let v = ScopeBinding[T](valueAddr) + log.setProperty v.name, v.value + +var dynamicProperties {.threadvar.}: seq[ScopeBindingBase] + +proc chroniclesThreadInit* = + # This must be called in each thread that is going to use logging + newSeq(dynamicProperties, 0) + +proc addDynamicProp[T](name: string, value: T) = + dynamicProperties.add ScopeBinding[T](name: name, + value: value, + appender: appenderIMPL[T]) + +proc logAllDynamicProperties*(log: var LogOutput) = + # This proc is intended for internal use only + for p in dynamicProperties: p.appender(log, p) + +macro dynamicLogScope*(args: varargs[untyped]): untyped = + # XXX: open question: should we support overriding + # of dynamic props inside inner scopes. This will + # have some run-time overhead. + let body = args[^1] + args.del(args.len - 1) + + if body.kind != nnkStmtList: + error "dynamicLogScope expects a block" + + let addDynamicProp = bindSym"addDynamicProp" + + var setProps = newTree(nnkStmtList) + for name, value in assignments(args): + setProps.add newCall(addDynamicProp, newLit(name), value) + + result = quote: + var currentDynamicScopesEntries = dynamicProperties.len + try: + `setProps` + `body` + finally: + dynamicProperties.setLen currentDynamicScopesEntries + +chroniclesThreadInit() + diff --git a/chronicles/log_output.nim b/chronicles/log_output.nim new file mode 100644 index 0000000..1950186 --- /dev/null +++ b/chronicles/log_output.nim @@ -0,0 +1,174 @@ +import + times, strutils + +const + chronicles_timestamps {.strdefine.} = "on" + chronicles_sinks {.strdefine.} = "" + chronicles_indent {.intdefine.} = 2 + + enableTimestamps = chronicles_timestamps.toLowerAscii == "on" + indent = repeat(' ', chronicles_indent) + +when chronicles_timestamps.toLowerAscii notin ["on", "off"]: + {.error: "chronicles_timestamps must be set to either 'on' or 'off'".} + +type + FileOutput = object + + LogLevel* = enum + ALL, + DEBUG, + INFO, + NOTICE, + WARN, + ERROR, + FATAL, + NONE + + TextlineRecord[Output] = object + output: Output + + TextblockRecord[Output] = object + output: Output + + JsonRecord[Output] = object + output: Output + +var + logOutput: File + +when chronicles_sinks.len > 0: + {.error: "X".} +else: + type + LogOutput* = TextblockRecord[FileOutput] + +template append(o: var FileOutput, s: string) = + logOutput.write s + +template setStyle(o: var FileOutput, lvl: LogLevel) = + append(o, "[") + append(o, $lvl) + append(o, "] ") + +template resetStyle(o: var FileOutput) = + discard + +template flushOutput(o: var FileOutput) = + logOutput.flushFile + +template append(o: var string, s: string) = + o.add(s) + +template flushOutput(o: var string) = + discard + +template setStyle(o: var string, lvl: LogLevel) = + append(o, "[") + append(o, $lvl) + append(o, "] ") + +template resetStyle(o: var string) = + discard + +proc appendTimestamp(o: var auto) = + var ts = now() + append(o, $ts.year) + append(o, "-") + append(o, intToStr(ord(ts.month), 2)) + append(o, "-") + append(o, intToStr(ts.monthday, 2)) + append(o, " ") + append(o, intToStr(ts.hour, 2)) + append(o, ":") + append(o, intToStr(ts.minute, 2)) + append(o, ":") + append(o, intToStr(ts.second, 2)) + +# Text line record + +template setEventName*(r: var TextlineRecord, lvl: LogLevel, name: string) = + when enableTimestamps: + append(r.output, "[") + appendTimestamp(r.output) + append(r.output, "] ") + setStyle(r.output, lvl) + append(r.output, name & ":") + +template setFirstProperty*(r: var TextlineRecord, key: string, val: auto) = + append(r.output, " ") + append(r.output, key) + append(r.output, "=") + append(r.output, $val) + +template setProperty*(r: var TextlineRecord, key: string, val: auto) = + append(r.output, ",") + setFirstProperty(r, key, val) + +template flushRecord*(r: var TextlineRecord) = + append(r.output, "\n") + flushOutput(r.output) + resetStyle(r.output) + +# Textblock records + +template setEventName*(r: var TextblockRecord, lvl: LogLevel, name: string) = + when enableTimestamps: + append(r.output, "[") + appendTimestamp(r.output) + append(r.output, "] ") + setStyle(r.output, lvl) + append(r.output, name & "\n") + resetStyle(r.output) + +template setFirstProperty*(r: var TextblockRecord, key: string, val: auto) = + append(r.output, indent) + append(r.output, key) + append(r.output, ": ") + append(r.output, $val) + append(r.output, "\n") + +template setProperty*(r: var TextblockRecord, key: string, val: auto) = + setFirstProperty(r, key, val) + +template flushRecord*(r: var TextblockRecord) = + append(r.output, "\n") + flushOutput(r.output) + +# JSON output + +import json + +template jsonEncode(x: auto): string = $(%x) + +template setEventName*(r: var JsonRecord, lvl: LogLevel, name: string) = + append(r.output, """{"msg": """ & name.jsonEncode & + """, "lvl": """ & ($lvl).jsonEncode) + + when enableTimestamps: + var ts: string + appendTimestamp(ts) + append(r.output, ""","ts": """) + append(r.output, ts.jsonEncode) + +template setFirstProperty*(r: var JsonRecord, key: string, val: auto) = + append(r.output, ", ") + append(r.output, key.jsonEncode) + append(r.output, ": ") + append(r.output, val.jsonEncode) + +template setProperty*(r: var JsonRecord, key: string, val: auto) = + setFirstProperty(r, key, val) + +template flushRecord*(r: var JsonRecord) = + append(r.output, "}\n") + flushOutput(r.output) + +template optimizeLogWrites*{ + write(f, x) + write(f, y) +}(x, y: string{lit}, f: File) = + write(f, x & y) + +logOutput = stdout + diff --git a/chronicles/scope_helpers.nim b/chronicles/scope_helpers.nim new file mode 100644 index 0000000..16b6d58 --- /dev/null +++ b/chronicles/scope_helpers.nim @@ -0,0 +1,14 @@ +import macros + +iterator assignments*(n: NimNode, skip = 0): (string, NimNode) = + # extract the assignment pairs from a block with assigments + # or a call-site with keyword arguments. + for i in skip ..< n.len: + let child = n[i] + if child.kind in {nnkAsgn, nnkExprEqExpr}: + let name = $child[0] + let value = child[1] + yield (name, value) + else: + error "A scope definitions should consist only of key-value assignments" + diff --git a/tests/all.nim b/tests/all.nim new file mode 100644 index 0000000..8b13789 --- /dev/null +++ b/tests/all.nim @@ -0,0 +1 @@ + diff --git a/tests/dynamic_scopes.nim b/tests/dynamic_scopes.nim new file mode 100644 index 0000000..a20adb7 --- /dev/null +++ b/tests/dynamic_scopes.nim @@ -0,0 +1,19 @@ +import chronicles + +logScope: + topics = "main" + +type + Seconds = distinct int + +proc `$`*(t: Seconds): string = $(t.int) & "s" +proc `%`*(t: Seconds): string = $(t.int) + +proc main = + dynamicLogScope(reqId = 10, userId = 20): + info "test" + + warn("about to exit", timeSpent = 2.Seconds) + +main() + diff --git a/tests/lexical_scopes.nim b/tests/lexical_scopes.nim new file mode 100644 index 0000000..93e0821 --- /dev/null +++ b/tests/lexical_scopes.nim @@ -0,0 +1,26 @@ +import chronicles + +logScope: + a = 12 + b = "original-b" + +logScope: + x = 16 + b = "overriden-b" + +logScope: + c = 100 + +proc main = + logScope: + c = 10 + + logScope: + z = 20 + + info("main started", a = 10, b = "inner-b", d = "some-d") + +main() + +info("exiting", msg = "bye bye") +