接入 OpenTelemetry 1.17.0，覆盖 HTTP、HttpClient、.NET Runtime 和数据库链路。
新增 EF Core 数据库拦截器，记录耗时、失败数、慢查询数、TraceId、查询标签和 SQL 哈希；默认不记录完整 SQL及参数。 未配置 OTLP Collector 时不启动 SDK，避免无收益的性能开销。 为课表的作息、课程、灵活课程、考试、实验等六类查询增加稳定标签。 增加可配置的 500ms 慢查询阈值，以及生产环境变量示例。 README 补充 MySQL 慢查询与 EXPLAIN ANALYZE 操作规范。
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using System.Data.Common;
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using System.Diagnostics;
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using System.Diagnostics.Metrics;
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using System.Security.Cryptography;
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using System.Text;
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using Microsoft.EntityFrameworkCore.Diagnostics;
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namespace Jiaowu.Api.Infrastructure.Observability;
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public sealed class DatabaseCommandTelemetryInterceptor(
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ObservabilityOptions options,
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ILogger<DatabaseCommandTelemetryInterceptor> logger)
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: DbCommandInterceptor
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{
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public const string ActivitySourceName = "Jiaowu.Api.Database";
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public const string MeterName = "Jiaowu.Api.Database";
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private static readonly ActivitySource ActivitySource =
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new(ActivitySourceName);
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private static readonly Meter Meter = new(MeterName);
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private static readonly Histogram<double> CommandDuration =
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Meter.CreateHistogram<double>(
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"jiaowu.db.command.duration",
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"ms",
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"EF Core database command duration");
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private static readonly Counter<long> SlowCommandCount =
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Meter.CreateCounter<long>(
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"jiaowu.db.command.slow",
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"{command}",
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"EF Core commands exceeding the configured slow-query threshold");
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private static readonly Counter<long> FailedCommandCount =
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Meter.CreateCounter<long>(
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"jiaowu.db.command.failed",
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"{command}",
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"Failed EF Core database commands");
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public override DbDataReader ReaderExecuted(
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DbCommand command,
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CommandExecutedEventData eventData,
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DbDataReader result)
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{
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Observe(command, eventData.Duration, "reader");
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return result;
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}
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public override ValueTask<DbDataReader> ReaderExecutedAsync(
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DbCommand command,
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CommandExecutedEventData eventData,
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DbDataReader result,
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CancellationToken cancellationToken = default)
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{
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Observe(command, eventData.Duration, "reader");
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return ValueTask.FromResult(result);
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}
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public override int NonQueryExecuted(
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DbCommand command,
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CommandExecutedEventData eventData,
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int result)
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{
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Observe(command, eventData.Duration, "nonquery");
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return result;
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}
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public override ValueTask<int> NonQueryExecutedAsync(
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DbCommand command,
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CommandExecutedEventData eventData,
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int result,
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CancellationToken cancellationToken = default)
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{
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Observe(command, eventData.Duration, "nonquery");
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return ValueTask.FromResult(result);
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}
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public override object? ScalarExecuted(
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DbCommand command,
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CommandExecutedEventData eventData,
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object? result)
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{
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Observe(command, eventData.Duration, "scalar");
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return result;
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}
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public override ValueTask<object?> ScalarExecutedAsync(
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DbCommand command,
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CommandExecutedEventData eventData,
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object? result,
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CancellationToken cancellationToken = default)
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{
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Observe(command, eventData.Duration, "scalar");
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return ValueTask.FromResult(result);
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}
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public override void CommandFailed(
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DbCommand command,
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CommandErrorEventData eventData) =>
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Observe(
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command,
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eventData.Duration,
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"failed",
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eventData.Exception.GetType().Name);
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public override Task CommandFailedAsync(
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DbCommand command,
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CommandErrorEventData eventData,
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CancellationToken cancellationToken = default)
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{
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Observe(
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command,
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eventData.Duration,
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"failed",
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eventData.Exception.GetType().Name);
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return Task.CompletedTask;
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}
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public override void CommandCanceled(
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DbCommand command,
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CommandEndEventData eventData) =>
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Observe(command, eventData.Duration, "canceled", "canceled");
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public override Task CommandCanceledAsync(
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DbCommand command,
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CommandEndEventData eventData,
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CancellationToken cancellationToken = default)
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{
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Observe(command, eventData.Duration, "canceled", "canceled");
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return Task.CompletedTask;
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}
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private void Observe(
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DbCommand command,
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TimeSpan duration,
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string commandKind,
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string? errorType = null)
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{
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if (!options.Enabled) return;
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var queryName = GetQueryName(command.CommandText);
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var statementHash = GetStatementHash(command.CommandText);
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var provider = GetProviderName(command);
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var traceId = Activity.Current?.TraceId.ToString() ?? "none";
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var tags = new TagList
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{
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{ "db.system.name", provider },
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{ "db.operation.name", commandKind },
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{ "db.query.name", queryName }
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};
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if (errorType is not null)
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tags.Add("error.type", errorType);
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var durationMilliseconds = duration.TotalMilliseconds;
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CommandDuration.Record(durationMilliseconds, tags);
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if (errorType is not null)
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FailedCommandCount.Add(1, tags);
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using var activity = ActivitySource.StartActivity(
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ActivityKind.Client,
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Activity.Current?.Context ?? default,
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startTime: DateTimeOffset.UtcNow - duration,
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name: queryName);
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if (activity is not null)
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{
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activity.SetTag("db.system.name", provider);
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activity.SetTag("db.operation.name", commandKind);
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activity.SetTag("db.query.name", queryName);
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activity.SetTag("db.statement.hash", statementHash);
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activity.SetTag(
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"db.namespace",
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EmptyToNull(command.Connection?.Database));
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if (options.IncludeSqlText)
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{
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activity.SetTag(
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"db.query.text",
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Truncate(command.CommandText, options.MaximumSqlTextLength));
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}
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if (errorType is not null)
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{
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activity.SetTag("error.type", errorType);
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activity.SetStatus(ActivityStatusCode.Error, errorType);
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}
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activity.SetEndTime(DateTime.UtcNow);
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}
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if (errorType is not null)
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{
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logger.LogError(
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"Database command failed after {DurationMs:F1} ms: " +
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"{QueryName} ({CommandKind}, {Provider}, hash {StatementHash}, " +
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"error {ErrorType}, trace {TraceId}).",
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durationMilliseconds,
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queryName,
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commandKind,
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provider,
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statementHash,
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errorType,
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traceId);
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return;
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}
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if (durationMilliseconds < options.SlowQueryThresholdMilliseconds)
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return;
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SlowCommandCount.Add(1, tags);
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if (options.IncludeSqlText)
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{
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logger.LogWarning(
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"Slow database command took {DurationMs:F1} ms: " +
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"{QueryName} ({CommandKind}, {Provider}, hash {StatementHash}, " +
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"trace {TraceId}). " +
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"SQL template: {SqlTemplate}",
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durationMilliseconds,
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queryName,
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commandKind,
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provider,
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statementHash,
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traceId,
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Truncate(command.CommandText, options.MaximumSqlTextLength));
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}
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else
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{
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logger.LogWarning(
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"Slow database command took {DurationMs:F1} ms: " +
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"{QueryName} ({CommandKind}, {Provider}, hash {StatementHash}, " +
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"trace {TraceId}).",
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durationMilliseconds,
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queryName,
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commandKind,
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provider,
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statementHash,
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traceId);
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}
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}
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internal static string GetQueryName(string commandText)
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{
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using var reader = new StringReader(commandText);
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while (reader.ReadLine() is { } line)
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{
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var trimmed = line.Trim();
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if (trimmed.Length == 0) continue;
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if (trimmed.StartsWith("-- ", StringComparison.Ordinal))
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return Truncate(trimmed[3..].Trim(), 120);
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return $"{FirstToken(trimmed)}:{GetStatementHash(commandText)}";
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}
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return $"unknown:{GetStatementHash(commandText)}";
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}
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internal static string GetStatementHash(string commandText)
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{
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var bytes = SHA256.HashData(Encoding.UTF8.GetBytes(commandText));
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return Convert.ToHexString(bytes.AsSpan(0, 6)).ToLowerInvariant();
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}
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private static string FirstToken(string value)
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{
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var end = value.IndexOfAny([' ', '\t', '\r', '\n', '(']);
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var token = end < 0 ? value : value[..end];
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return token.Length == 0
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? "command"
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: token.ToLowerInvariant();
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}
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private static string GetProviderName(DbCommand command)
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{
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var typeName = command.GetType().FullName ?? command.GetType().Name;
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if (typeName.Contains("MySql", StringComparison.OrdinalIgnoreCase))
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return "mysql";
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if (typeName.Contains("Sqlite", StringComparison.OrdinalIgnoreCase))
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return "sqlite";
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return "other_sql";
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}
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private static string? EmptyToNull(string? value) =>
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string.IsNullOrWhiteSpace(value) ? null : value;
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private static string Truncate(string value, int maximumLength) =>
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value.Length <= maximumLength
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? value
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: value[..maximumLength];
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}
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