chore: add more info for pipeline dryrun API (#5232)

src/servers/src/error.rs

@@ -159,6 +159,7 @@ pub enum Error {
 
     #[snafu(display("Pipeline management api error"))]
     Pipeline {
+        #[snafu(source)]
         source: pipeline::error::Error,
         #[snafu(implicit)]
         location: Location,

src/servers/src/http/event.rs

@@ -30,6 +30,7 @@ use axum::http::{Request, StatusCode};
 use axum::response::{IntoResponse, Response};
 use axum::{async_trait, BoxError, Extension, Json, TypedHeader};
 use bytes::Bytes;
+use common_error::ext::ErrorExt;
 use common_query::prelude::GREPTIME_TIMESTAMP;
 use common_query::{Output, OutputData};
 use common_telemetry::{error, warn};
@@ -41,13 +42,13 @@ use pipeline::util::to_pipeline_version;
 use pipeline::{GreptimeTransformer, PipelineVersion};
 use prost::Message;
 use serde::{Deserialize, Serialize};
-use serde_json::{Deserializer, Map, Value};
+use serde_json::{json, Deserializer, Map, Value};
 use session::context::{Channel, QueryContext, QueryContextRef};
 use snafu::{ensure, OptionExt, ResultExt};
 
 use crate::error::{
-    CatalogSnafu, DecodeOtlpRequestSnafu, Error, InvalidParameterSnafu, ParseJson5Snafu,
-    ParseJsonSnafu, PipelineSnafu, Result, UnsupportedContentTypeSnafu,
+    status_code_to_http_status, CatalogSnafu, DecodeOtlpRequestSnafu, Error, InvalidParameterSnafu,
+    ParseJson5Snafu, ParseJsonSnafu, PipelineSnafu, Result, UnsupportedContentTypeSnafu,
 };
 use crate::http::extractor::LogTableName;
 use crate::http::header::CONTENT_TYPE_PROTOBUF_STR;
@@ -404,6 +405,14 @@ fn check_data_valid(data_len: usize) -> Result<()> {
     Ok(())
 }
 
+fn add_step_info_for_pipeline_dryrun_error(step_msg: &str, e: Error) -> Response {
+    let body = Json(json!({
+        "error": format!("{}: {}", step_msg,e.output_msg()),
+    }));
+
+    (status_code_to_http_status(&e.status_code()), body).into_response()
+}
+
 #[axum_macros::debug_handler]
 pub async fn pipeline_dryrun(
     State(log_state): State<LogState>,
@@ -431,8 +440,20 @@ pub async fn pipeline_dryrun(
                     dryrun_pipeline_inner(data, &pipeline)
                 }
                 Some(pipeline) => {
-                    let pipeline = handler.build_pipeline(&pipeline)?;
-                    dryrun_pipeline_inner(data, &pipeline)
+                    let pipeline = handler.build_pipeline(&pipeline);
+                    match pipeline {
+                        Ok(pipeline) => match dryrun_pipeline_inner(data, &pipeline) {
+                            Ok(response) => Ok(response),
+                            Err(e) => Ok(add_step_info_for_pipeline_dryrun_error(
+                                "Failed to exec pipeline",
+                                e,
+                            )),
+                        },
+                        Err(e) => Ok(add_step_info_for_pipeline_dryrun_error(
+                            "Failed to build pipeline",
+                            e,
+                        )),
+                    }
                 }
             }
         }