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[2a01:4f8:120:2468::2]) by smtp.gmail.com with ESMTPSA id o19sm1145649wmc.12.2021.07.21.16.40.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 16:40:16 -0700 (PDT) From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?= To: git@vger.kernel.org Cc: Junio C Hamano , Jonathan Tan , Josh Steadmon , Bruno Albuquerque , Jeff King , Eric Sunshine , Han-Wen Nienhuys , =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?= Subject: [PATCH v3 00/12] serve.[ch]: general API cleanup Date: Thu, 22 Jul 2021 01:40:01 +0200 Message-Id: X-Mailer: git-send-email 2.32.0.955.ge7c5360f7e7 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org For v2, see: https://lore.kernel.org/git/cover-0.8-00000000000-20210628T191634Z-avarab@gmail.com/ Junio: Sorry about the late update, re: http://lore.kernel.org/git/xmqqsg07cz4g.fsf@gitster.g I think most people were on the fence about the need for this "startup_config" callback in v2. I think we could still do without it, but as the new 08/12 shows a big part of the API complexity was due to serve() supporting the --advertise-refs mode directly. 08-10/12 is a new late-series cleanup of that, which makes serve.[ch] a lot simpler. Ævar Arnfjörð Bjarmason (12): serve: mark has_capability() as static transport: rename "fetch" in transport_vtable to "fetch_refs" transport: use designated initializers serve: use designated initializers serve.c: add call_{advertise,command}() indirection serve: add support for a "startup" git_config() callback serve.c: move version line to advertise_capabilities() serve.[ch]: remove "serve_options", split up --advertise-refs code {upload,receive}-pack tests: add --advertise-refs tests upload-pack: document and rename --advertise-refs upload-pack.c: convert to new serve.c "startup" config cb serve.[ch]: don't pass "struct strvec *keys" to commands Documentation/git-receive-pack.txt | 5 + Documentation/git-upload-pack.txt | 12 +- Documentation/technical/http-protocol.txt | 3 + Documentation/technical/protocol-v2.txt | 3 + builtin/receive-pack.c | 3 +- builtin/upload-pack.c | 28 ++-- http-backend.c | 2 +- ls-refs.c | 45 ++---- ls-refs.h | 5 +- protocol-caps.c | 3 +- protocol-caps.h | 4 +- serve.c | 146 ++++++++++++++------ serve.h | 12 +- t/helper/test-serve-v2.c | 14 +- t/t5555-http-smart-common.sh | 159 ++++++++++++++++++++++ transport-helper.c | 18 +-- transport-internal.h | 2 +- transport.c | 32 ++--- upload-pack.c | 154 ++++++++++++--------- upload-pack.h | 16 +-- 20 files changed, 450 insertions(+), 216 deletions(-) create mode 100755 t/t5555-http-smart-common.sh Range-diff against v2: 1: fdb0c5f4df1 = 1: 192fb64ef82 serve: mark has_capability() as static 2: 7b8101dca71 = 2: d716bd3c537 transport: rename "fetch" in transport_vtable to "fetch_refs" 3: 766045e5f1d = 3: d31690614af transport: use designated initializers 4: bd920de1629 = 4: 13f1a8d8325 serve: use designated initializers 5: d0b02aa0c7d = 5: 99eeff6f890 serve.c: add call_{advertise,command}() indirection 7: 0a4fb01ae38 ! 6: be719dc3dc1 serve: add support for a "startup" git_config() callback @@ Commit message upload-pack.c yet, that case is more complex since it deals with both v1 and v2. It will be dealt with in a code a subsequent commit. + As we'll see in subsequent commits, by moving the + transfer.advertisesid config reading out of serve() we can simplify + the codepath around advertising-only requests. See 6b5b6e422ee (serve: + advertise session ID in v2 capabilities, 2020-11-11)) for the commit + that added transfer.advertisesid. + Signed-off-by: Ævar Arnfjörð Bjarmason ## ls-refs.c ## @@ serve.c: static struct protocol_capability capabilities[] = { static int call_advertise(struct protocol_capability *command, struct repository *r, struct strbuf *value) { -@@ serve.c: static int call_advertise(struct protocol_capability *command, - struct strbuf sb = STRBUF_INIT; - const char *msg; - + read_startup_config(command); + - strbuf_addf(&sb, "advertise/%s", command->name); - trace2_region_enter("serve", sb.buf, r); - ret = command->advertise(r, value); -@@ serve.c: static int call_command(struct protocol_capability *command, - int ret; - struct strbuf sb = STRBUF_INIT; + return command->advertise(r, value); + } +@@ serve.c: static int call_command(struct protocol_capability *command, + struct repository *r, struct strvec *keys, + struct packet_reader *request) + { ++ + read_startup_config(command); + - strbuf_addf(&sb, "command/%s", command->name); - trace2_region_enter("serve", sb.buf, r); - ret = command->command(r, keys, request); + return command->command(r, keys, request); + } + @@ serve.c: static int process_request(void) /* Main serve loop for protocol version 2 */ void serve(struct serve_options *options) -: ----------- > 7: b7928ddbe9b serve.c: move version line to advertise_capabilities() 6: baeee6539ad ! 8: fb80f152713 serve.c: add trace2 regions for advertise & command @@ Metadata Author: Ævar Arnfjörð Bjarmason ## Commit message ## - serve.c: add trace2 regions for advertise & command + serve.[ch]: remove "serve_options", split up --advertise-refs code - Now that we've factored out "call_{advertise,command}()" in a - preceding commit it becomes easy to trace all these callbacks with - trace2. Let's do that. As the tests demonstrate there's no v2 push - protocol, which the tests assert. + The "advertise capabilities" mode of serve.c added in + ed10cb952d3 (serve: introduce git-serve, 2018-03-15) is only used by + the http-backend.c to call {upload,receive}-pack with the + --advertise-refs parameter. See 42526b478e3 (Add stateless RPC options + to upload-pack, receive-pack, 2009-10-30). + + Let's just make cmd_upload_pack() take the two (v2) or three (v2) + parameters the the v2/v1 servicing functions need directly, and pass + those in via the function signature. The logic of whether daemon mode + is implied by the timeout belongs in the v1 function (only used + there). + + Once we split up the "advertise v2 refs" from "serve v2 request" it + becomes clear that v2 never cared about those in combination. The only + time it mattered was for v1 to emit its ref advertisement, in that + case we wanted to emit the smart-http-only "no-done" capability. + + Since we only do that in the --advertise-refs codepath let's just have + it set "do_done" itself in v1's upload_pack() just before send_ref(), + at that point --advertise-refs and --stateless-rpc in combination are + redundant (the only user is get_info_refs() in http-backend.c), so we + can just pass in --advertise-refs only. + + Since we need to touch all the serve() and advertise_capabilities() + codepaths let's rename them to less clever and obvious names, it's + been suggested numerous times, the latest of which is [1]'s suggestion + for protocol_v2_serve_loop(). Let's go with that. + + 1. https://lore.kernel.org/git/CAFQ2z_NyGb8rju5CKzmo6KhZXD0Dp21u-BbyCb2aNxLEoSPRJw@mail.gmail.com/ Signed-off-by: Ævar Arnfjörð Bjarmason + ## builtin/upload-pack.c ## +@@ builtin/upload-pack.c: int cmd_upload_pack(int argc, const char **argv, const char *prefix) + { + const char *dir; + int strict = 0; +- struct upload_pack_options opts = { 0 }; +- struct serve_options serve_opts = SERVE_OPTIONS_INIT; ++ int advertise_refs = 0; ++ int stateless_rpc = 0; ++ int timeout = 0; + struct option options[] = { +- OPT_BOOL(0, "stateless-rpc", &opts.stateless_rpc, ++ OPT_BOOL(0, "stateless-rpc", &stateless_rpc, + N_("quit after a single request/response exchange")), +- OPT_BOOL(0, "advertise-refs", &opts.advertise_refs, ++ OPT_BOOL(0, "advertise-refs", &advertise_refs, + N_("exit immediately after initial ref advertisement")), + OPT_BOOL(0, "strict", &strict, + N_("do not try /.git/ if is no Git directory")), +- OPT_INTEGER(0, "timeout", &opts.timeout, ++ OPT_INTEGER(0, "timeout", &timeout, + N_("interrupt transfer after seconds of inactivity")), + OPT_END() + }; +@@ builtin/upload-pack.c: int cmd_upload_pack(int argc, const char **argv, const char *prefix) + if (argc != 1) + usage_with_options(upload_pack_usage, options); + +- if (opts.timeout) +- opts.daemon_mode = 1; +- + setup_path(); + + dir = argv[0]; +@@ builtin/upload-pack.c: int cmd_upload_pack(int argc, const char **argv, const char *prefix) + + switch (determine_protocol_version_server()) { + case protocol_v2: +- serve_opts.advertise_capabilities = opts.advertise_refs; +- serve_opts.stateless_rpc = opts.stateless_rpc; +- serve(&serve_opts); ++ if (advertise_refs) ++ protocol_v2_advertise_capabilities(); ++ else ++ protocol_v2_serve_loop(stateless_rpc); + break; + case protocol_v1: + /* + * v1 is just the original protocol with a version string, + * so just fall through after writing the version string. + */ +- if (opts.advertise_refs || !opts.stateless_rpc) ++ if (advertise_refs || !stateless_rpc) + packet_write_fmt(1, "version 1\n"); + + /* fallthrough */ + case protocol_v0: +- upload_pack(&opts); ++ upload_pack(advertise_refs, stateless_rpc, timeout); + break; + case protocol_unknown_version: + BUG("unknown protocol version"); + + ## http-backend.c ## +@@ http-backend.c: static void get_info_refs(struct strbuf *hdr, char *arg) + + if (service_name) { + const char *argv[] = {NULL /* service name */, +- "--stateless-rpc", "--advertise-refs", ++ "--advertise-refs", + ".", NULL}; + struct rpc_service *svc = select_service(hdr, service_name); + + ## serve.c ## -@@ serve.c: static struct protocol_capability capabilities[] = { - static int call_advertise(struct protocol_capability *command, - struct repository *r, struct strbuf *value) +@@ serve.c: static int call_command(struct protocol_capability *command, + return command->command(r, keys, request); + } + +-static void advertise_capabilities(void) ++void protocol_v2_advertise_capabilities(void) { -- return command->advertise(r, value); -+ int ret; -+ struct strbuf sb = STRBUF_INIT; -+ const char *msg; -+ -+ strbuf_addf(&sb, "advertise/%s", command->name); -+ trace2_region_enter("serve", sb.buf, r); -+ ret = command->advertise(r, value); -+ msg = ret ? "advertised" : "hidden"; -+ trace2_region_leave_printf("serve", sb.buf, r, "%s", msg); -+ strbuf_release(&sb); -+ -+ return ret; + struct strbuf capability = STRBUF_INIT; + struct strbuf value = STRBUF_INIT; +@@ serve.c: static int process_request(void) + return 0; } - static int call_command(struct protocol_capability *command, - struct repository *r, struct strvec *keys, - struct packet_reader *request) +-/* Main serve loop for protocol version 2 */ +-void serve(struct serve_options *options) ++void protocol_v2_serve_loop(int stateless_rpc) { -- return command->command(r, keys, request); -+ int ret; -+ struct strbuf sb = STRBUF_INIT; -+ -+ strbuf_addf(&sb, "command/%s", command->name); -+ trace2_region_enter("serve", sb.buf, r); -+ ret = command->command(r, keys, request); -+ trace2_region_leave("serve", sb.buf, r); -+ strbuf_release(&sb); +- if (options->advertise_capabilities || !options->stateless_rpc) { +- advertise_capabilities(); +- /* +- * If only the list of capabilities was requested exit +- * immediately after advertising capabilities +- */ +- if (options->advertise_capabilities) +- return; +- } ++ if (!stateless_rpc) ++ protocol_v2_advertise_capabilities(); + + /* + * If stateless-rpc was requested then exit after + * a single request/response exchange + */ +- if (options->stateless_rpc) { ++ if (stateless_rpc) { + process_request(); + } else { + for (;;) + + ## serve.h ## +@@ + #ifndef SERVE_H + #define SERVE_H + +-struct serve_options { +- unsigned advertise_capabilities; +- unsigned stateless_rpc; +-}; +-#define SERVE_OPTIONS_INIT { 0 } +-void serve(struct serve_options *options); ++void protocol_v2_advertise_capabilities(void); ++void protocol_v2_serve_loop(int stateless_rpc); + + #endif /* SERVE_H */ + + ## t/helper/test-serve-v2.c ## +@@ t/helper/test-serve-v2.c: static char const * const serve_usage[] = { + + int cmd__serve_v2(int argc, const char **argv) + { +- struct serve_options opts = SERVE_OPTIONS_INIT; +- ++ int stateless_rpc = 0; ++ int advertise_capabilities = 0; + struct option options[] = { +- OPT_BOOL(0, "stateless-rpc", &opts.stateless_rpc, ++ OPT_BOOL(0, "stateless-rpc", &stateless_rpc, + N_("quit after a single request/response exchange")), +- OPT_BOOL(0, "advertise-capabilities", &opts.advertise_capabilities, ++ OPT_BOOL(0, "advertise-capabilities", &advertise_capabilities, + N_("exit immediately after advertising capabilities")), + OPT_END() + }; +@@ t/helper/test-serve-v2.c: int cmd__serve_v2(int argc, const char **argv) + argc = parse_options(argc, argv, prefix, options, serve_usage, + PARSE_OPT_KEEP_DASHDASH | + PARSE_OPT_KEEP_UNKNOWN); +- serve(&opts); + -+ return ret; ++ if (advertise_capabilities) ++ protocol_v2_advertise_capabilities(); ++ else ++ protocol_v2_serve_loop(stateless_rpc); + + return 0; + } + + ## upload-pack.c ## +@@ upload-pack.c: static int send_ref(const char *refname, const struct object_id *oid, + " allow-tip-sha1-in-want" : "", + (data->allow_uor & ALLOW_REACHABLE_SHA1) ? + " allow-reachable-sha1-in-want" : "", +- data->stateless_rpc ? " no-done" : "", ++ data->no_done ? " no-done" : "", + symref_info.buf, + data->allow_filter ? " filter" : "", + session_id.buf, +@@ upload-pack.c: static int upload_pack_config(const char *var, const char *value, void *cb_data) + return parse_hide_refs_config(var, value, "uploadpack"); } - static void advertise_capabilities(void) +-void upload_pack(struct upload_pack_options *options) ++void upload_pack(const int advertise_refs, const int stateless_rpc, ++ const int timeout) + { + struct packet_reader reader; + struct upload_pack_data data; +@@ upload-pack.c: void upload_pack(struct upload_pack_options *options) + + git_config(upload_pack_config, &data); + +- data.stateless_rpc = options->stateless_rpc; +- data.daemon_mode = options->daemon_mode; +- data.timeout = options->timeout; ++ data.stateless_rpc = stateless_rpc; ++ data.timeout = timeout; ++ if (data.timeout) ++ data.daemon_mode = 1; + + head_ref_namespaced(find_symref, &data.symref); + +- if (options->advertise_refs || !data.stateless_rpc) { ++ if (advertise_refs || !data.stateless_rpc) { + reset_timeout(data.timeout); ++ if (advertise_refs) ++ data.no_done = 1; + head_ref_namespaced(send_ref, &data); + for_each_namespaced_ref(send_ref, &data); + advertise_shallow_grafts(1); +@@ upload-pack.c: void upload_pack(struct upload_pack_options *options) + for_each_namespaced_ref(check_ref, NULL); + } + +- if (!options->advertise_refs) { ++ if (!advertise_refs) { + packet_reader_init(&reader, 0, NULL, 0, + PACKET_READ_CHOMP_NEWLINE | + PACKET_READ_DIE_ON_ERR_PACKET); - ## t/t5705-session-id-in-capabilities.sh ## -@@ t/t5705-session-id-in-capabilities.sh: do - --upload-pack "GIT_TRACE2_EVENT=\"$(pwd)/tr2-server-events\" git-upload-pack" \ - origin && - grep \"key\":\"server-sid\" tr2-client-events && -- grep \"key\":\"client-sid\" tr2-server-events -+ grep \"key\":\"client-sid\" tr2-server-events && -+ -+ if test "$PROTO" = 2 -+ then -+ grep \"event\":\"region_enter\".*\"category\":\"serve\" tr2-server-events && -+ grep \"event\":\"region_leave\".*\"category\":\"serve\" tr2-server-events -+ fi - ' - - test_expect_success "session IDs advertised (push v${PROTO})" ' -@@ t/t5705-session-id-in-capabilities.sh: do - --receive-pack "GIT_TRACE2_EVENT=\"$(pwd)/tr2-server-events\" git-receive-pack" \ - origin HEAD:new-branch && - grep \"key\":\"server-sid\" tr2-client-events && -- grep \"key\":\"client-sid\" tr2-server-events -+ grep \"key\":\"client-sid\" tr2-server-events && -+ -+ if test "$PROTO" = 2 -+ then -+ ! grep \"event\":\"region_enter\".*\"category\":\"serve\" tr2-server-events && -+ ! grep \"event\":\"region_leave\".*\"category\":\"serve\" tr2-server-events -+ fi - ' - done + ## upload-pack.h ## +@@ + #ifndef UPLOAD_PACK_H + #define UPLOAD_PACK_H + +-struct upload_pack_options { +- int stateless_rpc; +- int advertise_refs; +- unsigned int timeout; +- int daemon_mode; +-}; +- +-void upload_pack(struct upload_pack_options *options); ++void upload_pack(const int advertise_refs, const int stateless_rpc, ++ const int timeout); + struct repository; + struct strvec; -: ----------- > 9: beafe9811c1 {upload,receive}-pack tests: add --advertise-refs tests -: ----------- > 10: c6870b5f18a upload-pack: document and rename --advertise-refs 8: 9fd6138aa62 ! 11: 2d4c3d0d463 upload-pack.c: convert to new serve.c "startup" config cb @@ Commit message "is_our_ref()" is constant after startup (usually it'll never change for a given server's configuration, or change once). - This requires a very light compatibly layer with the serve.c callback - mechanism in the form of "upload_pack" for the v0 and v1 protocols. + This requires a very light compatibility layer with the serve.c + callback mechanism in the form of "upload_pack" for the v0 and v1 + protocols. Signed-off-by: Ævar Arnfjörð Bjarmason @@ upload-pack.c: enum allow_uor { + * upload_pack_data" below. + */ +static int v1_have_startup_config; -+static int config_keepalive = 5; ++static int config_keepalive_secs = 5; +static enum allow_uor config_allow_uor; +static unsigned config_advertise_sid; +static const char *config_pack_objects_hook; @@ upload-pack.c: static void create_pack_file(struct upload_pack_data *pack_data, break; - polltimeout = pack_data->keepalive < 0 -+ polltimeout = config_keepalive < 0 ++ polltimeout = config_keepalive_secs < 0 ? -1 - : 1000 * pack_data->keepalive; -+ : 1000 * config_keepalive; ++ : 1000 * config_keepalive_secs; ret = poll(pfd, pollsize, polltimeout); @@ upload-pack.c: static int send_ref(const char *refname, const struct object_id * - (data->allow_uor & ALLOW_REACHABLE_SHA1) ? + (config_allow_uor & ALLOW_REACHABLE_SHA1) ? " allow-reachable-sha1-in-want" : "", - data->stateless_rpc ? " no-done" : "", + data->no_done ? " no-done" : "", symref_info.buf, @@ upload-pack.c: static int parse_object_filter_config(const char *var, const char *value, return 0; @@ upload-pack.c: static int parse_object_filter_config(const char *var, const char - data->allow_ref_in_want = git_config_bool(var, value); - } else if (!strcmp("uploadpack.allowsidebandall", var)) { - data->allow_sideband_all = git_config_bool(var, value); -+ config_keepalive = git_config_int(var, value); -+ if (!config_keepalive) -+ config_keepalive = -1; ++ config_keepalive_secs = git_config_int(var, value); ++ if (!config_keepalive_secs) ++ config_keepalive_secs = -1; } else if (!strcmp("core.precomposeunicode", var)) { precomposed_unicode = git_config_bool(var, value); } else if (!strcmp("transfer.advertisesid", var)) { @@ upload-pack.c: static int parse_object_filter_config(const char *var, const char if (!strcmp("uploadpack.packobjectshook", var)) - return git_config_string(&data->pack_objects_hook, var, value); + return git_config_string(&config_pack_objects_hook, var, value); -+ } + } + return 0; +} + @@ upload-pack.c: static int parse_object_filter_config(const char *var, const char + +int serve_upload_pack_startup_config(const char *var, const char *value, void *data) +{ -+ int ret; -+ ret = upload_pack_startup_config(var, value, data); -+ if (ret) -+ return ret; -+ ret = upload_pack_startup_config_v2_only(var, value, data); -+ if (ret) -+ return ret; ++ upload_pack_startup_config(var, value, data); ++ upload_pack_startup_config_v2_only(var, value, data); + return 0; +} + @@ upload-pack.c: static int parse_object_filter_config(const char *var, const char +{ + struct upload_pack_data *data = cb_data; + -+ if (!strcmp("uploadpack.allowfilter", var)) { ++ if (!strcmp("uploadpack.allowfilter", var)) + data->allow_filter = git_config_bool(var, value); - } if (parse_object_filter_config(var, value, data) < 0) -@@ upload-pack.c: void upload_pack(struct upload_pack_options *options) + return -1; +@@ upload-pack.c: void upload_pack(const int advertise_refs, const int stateless_rpc, upload_pack_data_init(&data); @@ upload-pack.c: void upload_pack(struct upload_pack_options *options) + git_config(upload_pack_startup_config, NULL); git_config(upload_pack_config, &data); - data.stateless_rpc = options->stateless_rpc; + data.stateless_rpc = stateless_rpc; @@ upload-pack.c: static void process_args(struct packet_reader *request, /* process want */ if (parse_want(&data->writer, arg, &data->want_obj)) -: ----------- > 12: e4eb31b5b8e serve.[ch]: don't pass "struct strvec *keys" to commands -- 2.32.0.955.ge7c5360f7e7